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High nitrogen fertilizer input enhanced the microbial network complexity in the paddy soil

Soil Ecology Letters 2024年第2期6卷 97-109页

作者： Yanan Chen Yan Li Tianyi Qiu Haoran He Ji Liu Chengjiao Duan Yongxing Cui Min Huang Chunyan Wu Linchuan Fang The research center of Soil and water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of EducationYangling712100China State key laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation CAS and MWRYangling712100China University of Chinese Academy of Sciences Beijing100049China Institute of Environment Resource and Soil Fertilizer Zhejiang Academy of Agricultural SciencesHangzhou310021China College of Natural resources and Environment Northwest A&F UniversityYangling712100China Hubei Province key laboratory for Geographical Process Analysis and Simulation Central China Normal UniversityWuhan430079China Department of ecohydrology Leibniz Institute of Freshwater Ecology and Inland FisheriesBerlin12587Germany Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing100871China College of resources and Environmental engineering Wuhan University of TechnologyWuhan430070China CAS center for Excellence in Quaternary Science and Global Change Xi’an710061China

N fertilizer altered bacterial community compositions by changing soil nutrients.•Bacterial ammonia oxidation became predominated with the increasing N rate.•Excessive N input caused the information of a more complex microbial network.•Intensified microbial competition by excessive N was due to negative link ***(N)fertilization drives the structure and function of soil microbial communities,which are crucial for regulating soil biogeochemical cycling and maintaining ecosystem *** the N fertilizer effects on soil microbial composition and diversity have been widely investigated,it is generally overlooked that ecosystem processes are carried out via complex associations among microbiome ***,we examined the effects of five N fertilization levels(0,135,180,225,and 360 kg N ha−1)on microbial co-occurrence networks and key functional taxa such as ammonia-oxidizers in paddy *** results showed that N addition altered microbial community composition,which were positively related to soil total N and available phosphorus(P)*** abundance of ammonia-oxidizing archaea(AOA)significantly decreased after N addition,whereas ammonia-oxidizing bacteria(AOB)increased in N360 *** with low-N group(N0 and N135),the high-N group(N225 and N360)shaped more complex microbial webs and thus improved the stability of the microbial *** least squares path modeling further revealed that N fertilizer had a higher effect on microbial network complexity in the high-N group(0.83)than the low-N group(0.49).Although there were more positive links across all microbial networks,the proportion of negative links significantly increased in the high-N network,suggesting that excess N addition aggravated the competition among microbial *** these interactions between microbial communities and N fertilization advances our understanding of biogeochemical processes in paddy soils and their effects on nutrient supply to

关键词： nitrogen fertilizer paddy soil co-occurrence network microbial interaction

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Comparable water use of two contrasting riparian forests in the lower Heihe river basin, Northwest China

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Journal of Forestry research 2018年第5期29卷 1215-1224页

作者： Tengfei Yu Qi Feng Jianhua Si Xiaoyou Zhang Haiyang Xi Chunyan Zhao Alxa Desert Eco-hydrology Experimental research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences Lanzhou 730000 China key laboratory of Eco-hydrology of inland river basin Chinese Academy of Sciences Lanzhou 730000 China gansu hydrology and water resources engineering research center Lanzhou 730000 China

Understanding forest ecosystem evapotranspiration（ET） is crucial for water-limited environments,particularly those that lack adequate quantified data such as the lower Heihe river basin of northwest China which is primarily dominated by Tamarix ramosissima *** Populus euphratica ***,we selected the growing season for 2 years （2012 and 2014） of two such forests under similar meteorological conditions to compare ET using the eddy covariance（EC） *** the growing seasons,daily ET of *** ranged from 0.3 to 8.0 mm day^（-1） with a mean of 3.6 mm day^（-1）,and daily ET of *** ranged from 0.9 to 7.9 mm day^（-1） with a mean of 4.6 mm day^（-1） for a total of 548 and 707 mm,*** significantly higher ET of the *** stand was directly linked to high soil evaporation rates under sufficient water availability from *** the soil evaporation was disregarded,water use was comparable to two contrasting riparian forests,a *** forest with a total transpiration of 465 mm and a *** forest with 473 *** analysis demonstrated that climate factors accounted for at least 80% of ET variation in both forest *** conclusion,water use of the riparian forests was low and comparable in this arid region,that suggest the long-term plant adaptation to the local climate and conditions of water availability.

关键词： Eddy covariance Evapotranspiration Heihe river basin Riparian forest

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Identifying hot spots of long-duration extreme climate events in the northwest arid region of China and implications for glaciers and runoff

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research in Cold and Arid Regions 2022年第6期14卷 347-360页

作者： ShaoPing Wang YongJian Ding FengQing Jiang XiaoDong Wu Jie Xue State key laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China key laboratory of ecohydrology of inland river basin Chinese Academy of SciencesNorthwest Institute of Eco-Environment and ResourcesLanzhouGansu 730000China College of resources and Environment University of Chinese Academy of SciencesBeijing 100049China China-Pakistan Joint research center on Earth Sciences CAS-HECIslamabad 45320Pakistan State key laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqiXinjiang 830011China

China’s Northwest Arid Region(NAR),with dry and cold climate conditions and glaciers widely developed in the high mountains,provides vital water resources for *** consecutive cold,warm,dry and wet days have much higher impacts on the water cycle process in this region than extreme temperature and precipitation events with short durations but high *** and nonparametric trend analysis methods widely used in climatology and hydrology are employed to identify the temporal and spatial features of the changes in the consecutive cold,warm,dry and wet days in the NAR based on China’s 0.5°×0.5°meteorological grid datasets of daily temperature and precipitation from 1961 to *** study found that(1)the consecutive cold days(Cold Spell Duration Indicator,CSDI),and the consecutive dry days(CDD)decreased,while the consecutive warm days(Warm Spell Duration Indicator,WSDI),and the consecutive wet days(CWD)increased from 1961 to 2018,(2)and the eastern Kunlun Mountains were the hot spots where all of these consecutive climate indices changed significantly,(3)and the changes in these consecutive climate indices were highly correlated with the rise in the Global Mean Land/Ocean Temperature *** results indicated that winters tended to warmer and dryer and summer became hotter and wetter during 1961–2018 in the NAR under the global warming,which can lead to the sustained glacier retreat and the increase in summer runoff in this region,and the eastern Kunlun Mountains are the area where could face high risks of water scarcity and floods if the changes in these climate indices continue in the *** the vulnerability of the socio-economic systems in the NAR to a water shortage and floods,it is most crucial to improve the strategies of water resources management,disaster prevention and risk management for this region under climate change.

关键词： water resources Floods Consecutive cold/warm/dry/wet days Hot spot Glaciers

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The effect of hydrologic process changes on NDVI in the desert-oasis ecotone of the Hexi Corridor

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Science China Earth Sciences 2014年第12期57卷 3107-3117页

作者： ZHAO WenZhi CHANG XueLi Linze inland river basin research Station Key Laboratory of Ecohydrology of Inland River Basin Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences School of Geography and Planning Ludong University

In the arid inland river basins of northwestern China,human activities control almost all the surface hydrologic *** potential effects of these altered hydrologic processes are gradually becoming clear,especially since the 2000 implementation of the integrated water resources management projects in the Shiyang river,the Heihe river,the Tarim river,and the Shuler *** the appearance of these eco-hydrology changes and consequent environmental effects in the oasis has attracted broad attention,related research is still ***-hydrological process changes in the desert-oasis ecotone were investigated in the Pingchuan irrigation district in the middle reaches of the Heihe *** results showed that the annual average amount of surface water irrigation during the past 20 years has decreased by 1.498×107 m3,while the annual average amount of well irrigation has increased by 1.457×107 m3,since 2000,when the State Council of China approved the water diversion scheme for the Heihe river *** groundwater depth before the water diversion scheme generally varied between2.44–3.19 m(average 2.73±0.24 m),while that after the water diversion scheme has varied between 3.08–4.01 m(average3.79±0.62 m).The distribution area ofwater depth decreased from 3612 to 394 hm2;while the distribution area of>3 m groundwater depth increased from 853 to 3843 ***,although the hydrologic processes changed dramatically,no significant effects on vegetation productivity in the desert-oasis ecotone were detected during the study period.

关键词： Hexi Corridor desert-oasis ecotone Pingchuan irrigation district hydrologic processes groundwater depth NDVI

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A paleo-hydrological simulation experiment and its verification in an inland basin

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research in Cold and Arid Regions 2019年第4期11卷 267-282页

作者： YuXin Zhang Yu Li XinZhong Zhang ChengQi Zhang WangTing Ye Yuan Liu key laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesCenter for Hydrologic Cycle and Water Resources in Arid RegionLanzhou UniversityLanzhouGansu 730000China key laboratory of ecohydrology of inland river basin/gansu hydrology and water resources engineering research center Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China

Hydrological circulation,as the most basic material cycle and active natural phenomenon on earth,exerts a significant in fluence on climate *** mid-Holocene is an important period to better understand modern environmental change;however,little research has focused on its quantitative simulation of paleo-hydrological *** this research,we first collected chronological evidence and sediment records from six Holocene sedimentary sections in the Shiyang river Ba sin to reconstruct the mid-Holocene environment and terminal paleo-lake ***,we comprehensively analyzed modern pollen combinations and their propagation characteristics in surface soil,air,river and lacustrine sediments in the Shiyang river basin,and combined the pollen records,as well as quantitatively reconstructed the millennial-scale vegeta tion ***,based on the land-cover adjustment results during the mid-Holocene,we successfully used the Soil and water Assessment Tool(SWAT)model,a modern distributed hydrological watershed model,to simulate mid-Holocene runoff in the *** show that the reconstructed climate in the basin was warmer and moister than that in recent *** types in the mid-Holocene mainly consisted of sub-alpine shrub distributed between 2,550 m and 2,750 m,forest at an elevation of 2,550 2,750 m,steppe at an elevation of 1,550 2,150 m and desert steppe below 1,550 *** up stream,midstream,downstream and average annual runoff of the mid-Holocene in the basin were 16.76×10^8 m^3,22.86×10^8 m^3,9.00×10^8 m^3 and 16.20×10^8 m^3 respectively,compared to 15.61×10^8 m^3 of modern annual ***,the area of terminal paleo-lake in the mid-Holocene was 628 km^***,this study provides a new quantitative method for paleo-hy drological simulation.

关键词： SWAT model inland basin vegetation reconstruction runoff simulation mid-Holocene

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Chemical characteristics of precipitation and the indicative significance for sand dust events in the northern and southern slopes of Wushaoling Mountain, northwestern China

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Journal of Arid Land 2017年第6期9卷 911-923页

作者： LI Zongjie LIU Fei SONG Yong SONG Lingling TIAN Qing JIA Bing LI Yongge MA Jinzhu key laboratory of Western China's Environmental Systems (Ministry of Education) College of Earth and Environmental Sciences Lanzhou University Lanzhou 730000 China CSIRO Land and water Private Bag 10 Clayton South VIC 3169 Australia College of Forestry Gansu Agricultural University Lanzhou 730070 China key laboratory of ecohydrology of inland river basin gansu/hydrology and water resources engineering research center Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China

Precipitation chemistry analysis is essential to evaluate the atmospheric environmental quality and identify the sources of atmospheric pollutants. In this study, we collected a total of 480 precipitation samples at 6 sampling sites in the northern and southern slopes of Wushaoling Mountain from May 2013 to July 2014 to analyze the chemical characteristics of precipitation and to identify the main sources of ions in precipitation. Furthermore, we also explored the indicative significance for sand dust events in the northern and southern slopes of Wushaoling Mountain based on the precipitation chemistry *** the sampling period（from May 2013 to July 2014）, the p H values, EC（electrical conductivity）values and concentrations of cations（Ca^（2＋）, Mg^（2＋）, Na~＋, K~＋ and NH_4~＋） and anions（SO_4^（2–）, NO_3~–, Cl~–, NO_2~– and F~–） in precipitation were different in the northern and southern slopes at daily and seasonal time scales, with most of the values being higher in the northern slope than in the southern slope. The chemical type of precipitation in the southern and northern slopes was the same, i.e.,SO_4^（2–）-Ca^（2＋）-NO_3~–-Na~＋. The concentrations of ions in precipitation were mainly controlled by terrigenous material and anthropogenic activities（with an exception of Cl~–）. The concentration of Cl~– in precipitation was mainly controlled by the sea salt fraction. The concentrations of Na＋ and Cl~– showed an increasing trend after the occurrence of sand dust events both in the northern and southern slopes. In addition, after the occurrence of sand dust events, the concentrations of K~＋, Mg^（2＋）, SO_4^（2–）, NO_3~– and Ca^（2＋） showed an increasing trend in the southern slope and a decreasing trend in the northern slope. It is our hope that the results may be helpful to further understand the atmospheric pollution caused by sand dust events in the Wushaoling Mountain and can also provide a scientific basis for the effective prevention of atmospheric pollution

关键词： precipitation chemistry source assessment sand dust event Wushaoling Mountain

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Temperature and precipitation changes in Extensive Hexi Region, China, 1960–2011

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research in Cold and Arid Regions 2016年第3期8卷 212-226页

作者： Wei Liu ZongXing Li Meng Zhu XiaoYan Guo LiJuan Chen Cold and Arid Regions Environmental and engineering research Institute Key Laboratory of Ecohydrology of Inland River Basin/Gansu Hydrology and Water Resources Engineering Research CenterChinese Academy of SciencesLanzhouGansu 730000China University of Chinese Academy of Sciences Beijing 100049China

Global climate change has been evident in many places worldwide. This study provxdes a better understanding of the variability and changes in frequency, intensity, and duration of temperature, precipitation, and climate extremes in the Extensive Hexi Region, based on meteorological data from 26 stations. The analysis of average, maximum, and minimum temperatures revealed that statistically significant warming occurred from 1960 to 2011. All temperature extremes dis- played trends consistent with warming, with the exception of coldest-night temperature （TNn） and coldest-day tempera- ture （TXn）, which were particularly evident in high-altitude areas and at night. Amount of precipitation and number of rainy days slowly increased with no significant regional trends, mainly occurring in the Qilian Mountains and Hexi Cor- ridor. The significance of changes in precipitation extremes during 1960-2011 was high, hut the regional trends of max- imum 5-day precipitation （RX5day）, the average precipitation on wet days （SDII）, and consecutive wet days （CWD） were not significant. The variations in the studied parameters indicate an increase in both the extremity and strength of precip- itation events, particularly in higher-altitude regions. Furthermore, the contribution from very wet precipitation （R95） and extremely wet precipitation （R99） to total precipitation also increased between 1960 and 2011. The assessment of these changes in temperature and precipitation may help in developing better management practices for water resources. Future studies in the region should focus on the impact of these changes on runoffs and glaciers.

关键词： climate change global warming extreme events China

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Distribution and Estimation of Aboveground Biomass of Alpine Shrubs along an Altitudinal Gradient in a Small watershed of the Qilian Mountains, China

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Journal of Mountain Science 2015年第4期12卷 961-971页

作者： LIU Zhang-wen CHEN Ren-sheng SONG Yao-xuan HAN Chun-tan Qilian Alpine Ecology & hydrology research Station Key Laboratory of Ecohydrology of Inland Basin Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences University of Chinese Academy of Sciences

Shrublands serve as an important component of terrestrial ecosystems, and play an important role in structure and functions of alpine *** estimation of biomass is critical to examination of the productivity of alpine ecosystems, due to shrubification under climate change in past *** this study, 14 experimental plots and 42 quadrates of the shrubs Potentilla fruticosa and Caragana jubata were selected along altitudes gradients from 3220 to 3650 m a.s.l.(above sea level) on semi-sunny and semi-shady slope in Hulu watershed of Qilian Mountains, *** foliage, woody component and total aboveground biomass per quadrate were examined using a selective destructive method, then the biomass were estimated via allometric equations based on measured parameters for two shrub *** results showed that *** accounted for 1–3 times more biomass(480.98 g/m2) than ***(191.21 g/m2).The aboveground biomass of both the shrubs varied significantly with altitudinal gradient(P<0.05).Woody component accounted for the larger proportion than foliage component in the total aboveground *** biomass on semi-sunnyslopes(200.27 g/m2 and 509.07 g/m2) was greater than on semi-shady slopes(182.14 g/m2 and 452.89g/m2) at the same altitude band for *** and *** contrast, the foliage biomass on semi-shady slopes(30.50 g/m2) was greater than on semi-sunny slopes(27.51 g/m2) for two *** deceased with increasing altitude for ***, whereas *** showed a hump-shaped pattern with *** equations were obtained from the easily descriptive parameters of height(H), basal diameter(D) and crown area(C) for biomass of *** and *** the equations type and variables comprising of the best model varied among the species, all equations related to biomass were significant(P < 0.005), with determination coefficients(R2) ranging from 0.81 to *** allometric equations satisfied the requirements of t

关键词： Aboveground biomass Allometric equations Alpine shrub Altitudinal gradient Qilian Mountains

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Root distribution of three dominant desert shrubs and their water uptake dynamics

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Journal of Plant Ecology 2017年第5期10卷 780-790页

作者： Shiqin Xu Xibin Ji Bowen Jin Jinglin Zhang State key laboratory of hydrology-water resources and Hydraulic engineering College of Hydrology and Water ResourcesHohai University1 Xikang RoadGulou DistrictNanjing 210098China Linze inland river basin research Station Laboratory of Inland River EcohydrologyCold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences320 Donggang West RoadChengguan DistrictLanzhou 730000China University of Chinese Academy of Sciences 19(A)Yuquan RoadShijingshan DistrictBeijing 100049China

Aims Root architecture is a crucial determinant in the water use of desert ***,lack of integrated research on the root functional type and water uptake dynamic hinders our current understanding of the water-use strategies of desert *** A field experiment was conducted to investigate the root functional type of three dominant desert species,Haloxylon ammodendron,Nitraria tangutorum and Calligonum mongolicum,and the dynam-ics of their root water *** stem sap flow and microclimate were monitored,and the intact root systems of these shrubs were excavated in their native habitats on the oasis-desert ecotone of northwestern china during the summer of *** Findings Based on root functional type,*** is phreatophytic,while *** and *** are non-phreatophytic species,which means *** can utilize multiple potential water sources,*** and *** mainly utilize shallow and middle soil *** average root water uptake rates(RWU)of ***,*** and *** were 0.56(±0.12),1.18(±0.19)and 1.31(±0.30)kg m^(−2)h^(−1),respectively,during the experimental period;the contributions of night-time RWU to total water uptake amount for the corresponding species were 12.7,2.9 and 10.6%,*** diurnal and seasonal dynamics of RWU in the three species were significantly different(Pwater-use patterns in combination with the patterns of root distribution,which may alleviate water competition during long-term water *** appears to be more drought tolerant than the other species due to its use of multiple water sources and stable water uptake rates during growing season.

关键词： root architecture stem sap flow water-use strategy arid region desert shrub

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Shifting from homogeneous to heterogeneous surfaces in estimating terrestrial evapotranspiration: Review and perspectives

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Science China Earth Sciences 2022年第2期65卷 197-214页

作者： Yuanbo LIU Guoyu QIU Hongsheng ZHANG Yonghui YANG Yinsheng ZHANG Quan WANG Wenzhi ZHAO Li JIA Xibin JI Yujiu XIONG Chunhua YAN Ning MA Shumin HAN Yifan CUI Nanjing Institute of Geography and Limnology Chinese Academy of SciencesNanjing 210008China School of Environment and Energy Peking University Shenzhen Graduate SchoolShenzhen 518055China laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100081China key laboratory for Agricultural water resources Center for Agricultural Resources ResearchInstitute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050022China key laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China Faculty of Agriculture Shizuoka UniversityShizuoka 422-8529Japan Northwest Institute of Eco-Environment and resources Chinese Academy of SciencesLanzhou 730000China key laboratory of ecohydrology of inland river basin Chinese Academy of SciencesLanzhou 730000China Aerospace Information research Institute Chinese Academy of SciencesBeijing 100094China School of Civil engineering Sun Yat-Sen UniversityGuangzhou 510275China key laboratory of water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Terrestrial evapotranspiration(ET)is a crucial link between Earth’s water cycle and the surface energy *** measurement and estimation remain a major challenge in geophysical,biological,and environmental *** work,represented by Dalton and Penman,and the development of theories and experiments on turbulent exchange in the atmospheric boundary layer(ABL),laid the foundation for mainstream methodologies in ET *** the 1990s,eddy covariance(EC)systems and satellite remote sensing have been widely applied from cold to tropical and from arid to humid *** cover water surfaces,wetlands,forests,croplands,grasslands,barelands,and urban areas,offering an exceptional number of reports on diverse ET *** nocturnal ET,hysteresis between ET and environmental forces,turbulence intermittency,island effects on heterogeneous surfaces,and phase transition between underlying surfaces are examples of reported new phenomena,posing theoretical and practical challenges to mainstream ET ***,based on non-conventional theories,new methods have emerged,such as maximum entropy production and nonparametric ***,high-frequency on-site observation and aerospace remote sensing technology in combination form multi-scale observations across plant stomata,leaves,plants,canopies,landscapes,and *** promotes an insightful understanding of diverse ET processes and synthesizes the common mechanisms of the processes between and across spatial and temporal *** the recent achievements in conception,model,and technology serve as the basis for breaking through the known difficulties in ET *** expect that they will provide a rigorous,reliable scientific basis and experimental support to address theoretical arguments of global significance,such as the water-heat-carbon cycle,and solve practical needs of national importance,including agricultural irrigation and food security,precise manageme

关键词： Evapotranspiration Atmospheric boundary layer Heterogeneous surface Uncertainty

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