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2001-2020年中国地表温度时空分异及归因分析

Journal of Geographical sciences 2024年第2期34卷 375-396页

作者：田浩刘琳张正勇陈泓瑾张雪莹王统霞康紫薇 Shihezi University Shihezi 832000XinjiangChina key laboratory of Oasis Town and Mountain-basin System Ecology of Xinjiang Bingtuan Shihezi 832003XinjiangChina key laboratory of Modern Water-Saving Irrigation of Xinjiang Production&Construction Group Shihezi832003XinjiangChina

The variation of land surface temperature(LST)has a vital impact on the energy balance of the land surface process and the ecosystem stability.Based on MDO11C3,we mainly used regression analysis,GIS spatial analysis,correlation analysis,and center-of-gravity model,to analyze the LST variation and its spatiotemporal differentiation in China from 2001 to 2020.Furthermore,we employed the Geodetector to identify the dominant factors contributing to LST variation in 38 eco-geographic zones of China and investigate the underlying causes of its pattern.The results indicate the following:(1)From 2001 to 2020,the LST climate average in China is 9.6℃,with a general pattern of higher temperatures in the southeast and northwest regions,lower temperatures in the northeast and Qinghai-Tibet Plateau,and higher temperatures in plains compared to lower temperatures in mountainous areas.Generally,LST has a significant negative correlation with elevation,with a correlation coefficient of–0.66.China’s First Ladder has the most pronounced negative correlation,with a correlation coefficient of–0.76 and the lapse rate of LST is 0.57℃/100 m.(2)The change rate of LST in China during the study is 0.21℃/10 a,and the warming area accounts for 78%,demonstrating the overall spatial pattern a“multi-core warming and axial cooling”.(3)LST’s variation exhibits prominent seasonal characteristics in the whole country.The spatial distribution of average value in winter and summer differs significantly from other seasons and shows more noticeable fluctuations.The centroid trajectory of the seasonal warming/cooling area is close to a loop shape and displays corresponding seasonal reverse movement.Cooling areas exhibit more substantial centroid movement,indicating greater regional variation and seasonal variability.(4)China’s LST variation is driven by both natural influences and human activities,of which natural factors contribute more,with sunshine duration and altitude being key factors.The boundary trend between the two dominant type areas is highl

关键词： land surface temperature spatiotemporal differentiation Geodetector dominant factor China

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Why lowland riparian trees are difficult to use for streamflow reconstruction

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Journal of Forestry Research 2024年第3期35卷 219-230页

作者： Xiaomei Peng Shengchun Xiao Bao Yang Quanyan Tian Vladimir V.Shishov key laboratory of Ecological Safety and Sustainable Development in Arid Lands Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000People's Republic of China School of Geography and Ocean science Nanjing UniversityNanjing 210023People's Republic of China Institute of Fundamental Biology and Biotechnology Siberian Federal UniversityKrasnoyarskRussia 660041

Existing streamflow reconstructions based on tree-ring analysis mostly rely on species from upland,mainly montane areas,while lowland species(generally plain)areas are rarely used.This limits the understanding of streamflow change history in the lowlands,which is an important basis for water resource management.This study focused on Populus euphratica stands located along the main stream,eastern and western tributaries in the lower reaches of the heihe river basin(HRb),in arid northwestern China.We investigated how streamflow regulation interferes with ripar-ian trees in lowlands when they used for streamflow recon-struction.Tree-ring width chronologies were developed and analyzed in conjunction with meteorological and hydrologic observation data.The results show streamflow regulation leads in sharp fluctuations in the streamflow allocation between the eastern tributaries and western tributaries.This resulted in instability of the correlation between streamflow at the two tributaries and at the Zhengyixia hydrologic station,with corresponding fluctuations in radial growth of poplar trees on the banks of the two tributaries and at the station.Streamflow regulation altered the natural patterns of seasonal streamflow below the station,changing the time window of poplar response.This study provides useful insight into tree-ring width based streamflow reconstruction in the lowlands.

关键词： Tree-ring width-Dendrochronology Populus euphratica The Ejina Oasis Streamflow

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How do GPM and TRMM precipitation products perform in alpine regions?A case study in northwestern China's Qilian Mountains

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Journal of Geographical sciences 2022年第5期32卷 913-931页

作者： SUN Weijun CHEN Rensheng WANG Lei WANG Yingshan HAN Chuntan HUAI Baojuan College of Geography and Environment Shandong Normal UniversityJinan250358China Qilian Alpine Ecology&Hydrology Research Station Key Laboratory of Ecohydrology of Inland River BasinNorthwest Institute of Eco-Environment and ResourcesCASLanzhou730000China

Satellite technologies provide valuable areal precipitation datasets in alpine mountains.However,coarse resolution still limits the use of satellite precipitation datasets in hydrological and meteorological research.We evaluated different time scales and precipitation magnitudes of Tropical Rainfall Measurement Mission 3B43 V7(TRMM)and Global Precipitation Measurement(GPM)products for alpine regions using ground precipitation datasets from January 2015 to June 2019 obtained from 25 national meteorological stations and 11 sets of T-200B weighing precipitation gauges in the Qilian Mountains.The results indicated that GPM outperformed TRMM at all temporal scales at an elevation3500 m,with the best performance at 4000 m.GPM and TRMM had the best estimation accuracy in areas with monthly precipitation of 30 mm and 40 mm,respectively.Both TRMM and GPM products underestimated mid to large daily precipitation and overestimated light daily precipitation averaging<2 mm/d.This research not only emphasizes the superiority of GPM/TRMM in different regions but also indicates the limitations of precipitation algorithms.

关键词： accuracy assessment GPM TRMM alpine regions precipitation

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Soil seed bank is affected by transferred soil thickness and properties in the reclaimed coal mine in the Qilian Mountains, China

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Journal of Arid Land 2023年第12期15卷 1529-1543页

作者： YANG Jingyi LUO Weicheng ZHAO Wenzhi LIU Jiliang WANG Dejin LI Guang College of Forestry Gansu Agricultural UniversityLanzhou 730070China Linze Inland river basin Research Station Chinese Ecosystem Research NetworkKey Laboratory of Ecohydrology of Inland River BasinNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Faculty of Modern Agricultural Engineering Kunming University of Science and TechnologyKunming 650500China

Reclamation of lands abandoned after mining in mountain areas is critical to erosion control,safety from landslides,and ecological protection of mountain ecosystems.However,little is known about alpine coal mine reclamation using the soil seed bank as a potential source for revegetation.We collected samples of persistent soil seed bank for germination experiments from nine reclaimed sites with different soil cover thicknesses and from six control sites in the Qilian Mountains of China.Soil properties of each site were determined(including soil water content,soil available potassium,soil available phosphorus,soil total nitrogen,pH,soil organic matter,soil total phosphorus,and soil total potassium,and soil alkali-hydrolyzable nitrogen),and the relationships of the characteristics of the soil seed bank with soil cover thickness and soil properties were examined.The results showed that the density,number of species,and diversity of the topsoil seed bank were significantly correlated with soil cover thickness,and all increased with the increment of soil cover thickness.Soil cover thickness controlled the soil seed bank by influencing soil properties.With the increase in soil cover thickness,soil properties(e.g.,soil organic matter,soil total nitrogen,etc.)content increased while soil pH decreased.The soil seed bank had the potential to restored the pre-mining habitat at reclaimed sites with approximately 20-cm soil cover thickness.Soil properties of reclaimed sites were lower than that of natural sites.The relationship between the soil seed bank and soil cover thickness determined in this study provides a foundation for improving reclamation measures used in coal mines,as well as for the management and monitoring of reclaimed areas.

关键词： soil seed bank soil cover thickness species composition soil properties Qilian Mountains

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Snowline and Snow Cover Monitoring at High Spatial Resolution in a Mountainous river basin Based on a Timelapse Camera at a Daily Scale

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Journal of Mountain science 2015年第1期12卷 60-69页

作者： LIU Jun-feng CHEN Ren-sheng WANG Gang Qilian Alpine Ecology and Hydrology Research Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences heihe key laboratory of ecohydrology and integrated river basin Management Chinese Academy of Sciences

Snowline change and snow cover distribution patterns are still poorly understood in steep alpine basins of the Qilian Mountainous region because fast changes in snow cover cannot be observed by current sensing methods due to their short time scale. To address this issue of daily snowline and snow cover observations, a groundbased EOS 7D camera and four infrared digital hunting video cameras(LTL5210A) were installed around the Hulugou river basin(HRB) in the Qilian Mountains along northeastern margin of the Tibetan Plateau(38°15'54 "N, 99°52'53" E) in September 2011.Pictures taken with the EOS 7D camera were georeferenced and the data from four LIL5210 A cameras and snow depth sensors were used to assist snow cover estimation. The results showed that the time-lapse photography can be very useful and precise for monitoring snowline and snow cover in mountainous regions. The snowline and snow cover evolution at this basin can be precisely captured at daily scale. In HRB snow cover is mainly established after October, and the maximum snow cover appeared during February and March. The consistent rise of the snowline and decrease in snow cover appeared after middle part of March. This melt process is strongly associated with air temperature increase.

关键词：积雪监测山区流域时间尺度高空间分辨率雪线相机青藏高原东北缘量表

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Dynamic evaluation of groundwater resources in Zhangye basin

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Research in Cold and Arid Regions 2016年第3期8卷 250-262页

作者： LiNa Mi HongLang Xiao ZhengLiang Yin ShengChun Xiao key laboratory of ecohydrology of Inland river basin Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences/Heihe Key Laboratory of Ecohydrology and Integrated River Basin ScienceLanzhouGansu 730000China University of Chinese Academy of sciences Beijing 100049China

Groundwater resource is vital to the sustainable development of socio-economics in arid and semi-arid regions of Northwest China. An estimation of the groundwater resources variation in Zhangye basin was made during 1985-2013 based on long-term groundwater observation data and geostatistical method. The results show that from 1985 to 2013, groundwater storage exhibited tremendous dissimilarity on temporal and spatial scale for the whole Zhangye basin, especially before and after implementation of the water diversion policy. Trend of groundwater storage varied from quick to slow decline or increase. The accumulative groundwater storage decreased nearly 47.52~ 108 m3, and annual average depletion rate reached 1.64x 108 m3/a. Among which, the accumulative groundwater storage of the river and well water mixed irrigation district decreased by 37.48x 108 m3, accounting for about 78.87% of the total groundwater depletion of the Zhangye basin. Accumulative depletion of groundwater storage varied in respective irrigation districts. Though groundwater resources depletion rate slowed down from 2005, the overall storage in the whole basin and re- spective districts during 1985-2013 was still in a severe deficit such that, the groundwater resource was in a rather negative balance, which could threaten the local aquifer. This is the joint effect of climate change and human activities, however human activities, such as water diversion policy and groundwater exploitation, became increasingly intense. Our research results could provide a reasonable estimation for the groundwater balance in Zhangye basin, providing a scientific basis for water resources unified planning and, this method can provide a relatively reliable way of estimation for large scale groundwater resources.

关键词： groundwater resources dynamic evaluation grotmdwater storage Zhangye basin

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Water sources of plants and groundwater in typical ecosystems in the lower reaches of the heihe river basin

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Research in Cold and Arid Regions 2014年第3期6卷 226-235页

作者： YunFeng Ruan LiangJu Zhao HongLang Xiao GuoDong Cheng MaoXian Zhou Fang Wang key laboratory of ecohydrology and integrated river basin science of CAS Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences University of Chinese Academy of sciences key laboratory of heihe ecohydrology and basin science of Gansu Province

Stable oxygen and hydrogen isotopic compositions （δ18O and δD） of soil water and shallow groundwater of a riparian forest, an artificial shrub forest, and Gobi of the lower reaches of the heihe river basin are used to study the recharge water sources of those ecosystems. IsoSource software is used to determine the δ180 values for root water of Populous euphratica and Tamarix ramosissima in the riparian forest ecosystem, Haloxylon ammodendron in the artificial shrub forest, and Reaumuria soongorica in the Gobi, as well as for local soil water and groundwater, and precipitation in the upper reaches of the heihe river basin. Our results showed that soil water and shallow groundwater of the riparian forest and the artificial shrub forest were recharged by river water which originated from precipitation in the upper reaches, and strong evaporation occurred in the artificial shrub forest. Soil water of the Gobi was not affected by heihe river water due to this area being far away from the river channel. The main water sources of Populous euphratica were from 40-60-cm soil water and groundwater, and of Tamarix ramosissima were from 40-80-cm soil water in the riparian forest ecosystem. In the artificial forest, Haloxylon ammodendron used 200-cm saturated-layer soil water and shallow groundwater. The Reaumuria soongorica mainly used soil water from the 175-200-cm depth in the Gobi. Therefore, soil water and groundwater are the main water sources which maintain survival and growth of the plants in the extremely arid regions of the lower reaches of the heihe river basin.

关键词： stable hydrogen and oxygen isotope composition （δD and δa80） extremely arid regions lower reaches of theheihe river basin plant water sources

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Effects of shrub presence and shrub species on ground beetle assemblages (Carabidae,Curculionidae and Tenebrionidae) in a sandy desert,northwestern China

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Journal of Arid Land 2015年第1期7卷 110-121页

作者： JiLiang LIU WenZhi ZHAO FengRui LI Linze Inland river basin Research Station Chinese Ecosystem Research Network laboratory of ecohydrology and integrated river basin science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

Shrub presence has an important effect on the structuring of ground beetles in desert ecosystems. In this study, in order to determine how shrubs and different species influence ground beetle assemblages in a sandy desert scrubland dominated by two different shrub species, namely Calligonum mongolicum and Nitraria sphaerocarpa, we sampled the ground beetles using pitfall traps during spring, summer and autumn in 2012. At the community level, the activity density of the ground beetles was shown to be significantly higher under shrubs than in intershrub bare habitats in spring; but an opposite pattern occurred in autumn, suggesting the presence of sea- son-specific shrub effects on the activity density of the ground beetles. Meanwhile, at the trophic group level, the activity density and species richness of predators were significantly greater under shrubs than in intershrub bare habitats in spring, whereas an opposite trend occurred on the activity density in autumn. N. sphaerocarpa shrubs had a positive effect on the activity density of herbivores in the three seasons, and C. mongolicum shrubs had a positive effect on the activity density of detritivores in spring and autumn. At the species level, more Microdera sp. was captured under shrubs than in intershrub bare habitats in spring. During the same time, we also found that C. mongolicum shrubs had a positive effect on Blaps gobiensis in spring, Carabus sp. in autumn, and Tentyria sp. in spring and autumn, and N. sphaerocarpa shrubs had a positive effect on Cyphogenia chinensis, Sternoplax setosa in spring and summer, and Curculionidae sp. 1 in summer and autumn. The study results suggest that shrub presence, shrub species and season variation are important factors for ground beetle assemblages in this desert ecosystem, but the responses of beetles differed among trophic and taxonomic levels.

关键词： Calligonum mongolicum Nitraria sphaerocarpa ground beetle assemblages sandy desert ecosystem heihe river basin

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Species-specific traits determine shrub-annual interactions during a growing season

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Journal of Arid Land 2015年第3期7卷 403-413页

作者： GeFei ZHANG WenZhi ZHAO Linze Inland river basin Research Station Key Laboratory of Ecohydrology of Inland River BasinCold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

Stress gradient hypothesis predicted that facilitative interactions usually increase in intensity and are importance with abiotic stress.By contrast,facilitation may be lost in time,when it involves the growth of benefactors or beneficiaries.Less is known about which response pattern is more common in arid desert.We present an empirical study to explore shrub-annual interactions at the community and individual level along the course of a single growing season in a desert steppe in northwest China.Here the severity of drought stress may increase in time due to uneven precipitation during plant growing season.We assessed growth responses of annuals in understory where two dominant shrubs were removed.Annuals responses showed a switch from weakly positive to more strongly positive beneath Calligonum mongolicum,whereas from positive to negative beneath Nitraria sphaerocarpa during the growing season.Additionally,annual species with contrasting functional traits showed distinct growth responses to canopies removal.There was evidence of an increase in soil moisture below the canopy of shrubs,but a decrease in potential evaporation rate and photosynthetically active radiation,which can partly explain these species-specific responses.We conclude that the balance between competitive and facilitative effects in shrub-annual interactions is not only governed by the severity of stress but also determined by plant traits,such as canopy structure of shrubs and functional traits of their understory annuals.

关键词： competition facilitation functional trait stress gradient temporal variation

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The changes in the annual distribution of mountain runoff during the period of 1965–2018 in Hexi Corridor, Northwest China

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Research in Cold and Arid Regions 2024年第2期16卷 73-83页

作者： Yan Luo ZhiXiang Lu Qi Feng Meng Zhu JinBo Zhang key laboratory of Ecological Safety and Sustainable Development in Arid Lands Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences University of Chinese Academy of sciences College of Resources and Environmental sciences Gansu Agricultural University

The annual distribution characteristics of river runoff in arid regions have significant implications for water resource stability and management. Based on the mountain runoff data from 1965 to 2018, this study examines the annual change characteristics of monthly runoff of the Shiyang river basin, heihe river basin, and Shule river basin in the Hexi Corridor, Northwest China. Many indexes are used and analyzed, including the coefficient of variance, the complete regulation coefficient, the concentration degree and concentration period, the magnitude of change, the skewness coefficient, and the kurtosis coefficient of the annual distribution curves. The results reveal the following:(1) The inhomogeneity of annual runoff distribution in the Taolai river and the rivers to the west of it, except the Shiyou river, show an increasing trend. Conversely, the inhomogeneity of the rivers to the east of the Taolai river generally show a downward trend, but the coefficient of variance value is still very high.(2) In the Shiyang river basin, the annual distribution of the concentration period is characterized by a relatively discrete pattern. Conversely, the heihe river basin exhibits a relatively concentrated pattern, and the distribution pattern of the Shule river basin is quite different. Notably, all concentration periods in the three basins have shifted backward after the 2000s.(3) The Shiyang river basin exhibits disordered annual distribution curves of runoff in different years. In contrast, the heihe river basin presents a typical 'single-peak' pattern with a prominent right-skewed. The Shule river basin has regular distribution curves, with a gradually significant'double-peak' pattern from east to west. Overall, there has been a slight change in runoff in the Shiyang river basin, while the heihe river basin and Shule river basin have experienced significant increases in runoff. The annual distribution curves of runoff in the Liyuan river and the rivers to the east of it exhibit a gentle peak pattern, and the appeara

关键词： Hexi Corridor Inland rivers Mountain runoff Annual distribution characteristics of runoff

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