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Relationships of ozone formation sensitivity with precursors emissions,meteorology and land use types,in Guangdong-Hong Kong-Macao Greater Bay Area,China

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Journal of Environmental Sciences 2020年第8期32卷 1-13页

作者： Yuping Chen Hui Yan Yijuan Yao Chunling Zeng Ping Gao Liyue Zhuang Liya Fan Daiqi Ye School of Environment and Energy South China University of Technology(SCUT)Guangzhou 510006China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control SCUTGuangzhou 510006China National Engineering Laboratory for Volatile Organic Compounds Pollution Control Technology and Equipment SCUTGuangzhou 510006China

Due to the influences of precursors emissions,meteorology,geography and other factors,ozone formation sensitivity(OFS)is generally spatially and temporally heterogeneous.This study characterized detailed spatial and temporal variations of OFS in Guangdong-Hong Kong-Macao Greater Bay Area(GBA)from 2012 to 2016 based on OMI satellite data,and analyzed the relationships of OFS with precursors emissions,meteorology and land use types(LUTs).From 2012 to 2016,the OFS tended to be NOx-limited in GBA,with the value of FNR(HCHO/NO 2)increasing from 2.04 to 2.22.According to the total annual emission statistics of precursors,NOx emissions decreased by 33.1%and VOCs emissions increased by 35.2%from 2012 to 2016,directly resulting in OFS tending to be NO x-limited.The Grey Relation Analysis results show that total column water(TCW),surface net solar radiation(SSR),air temperature at 2 m(T2)and surface pressure(SP)are the top four meteorological factors with the greatest influences on OFS.There are significant positive correlations between FNR and T2,SSR,TCW,and significant negative correlations between FNR and SP.In GBA,the OFS tends to be NO x-limited regime in wet season(higher T2,SSR,TCW and lower SP)and VOCs-limited regime in dry season(lower T2,SSR,TCW and higher SP).The FNR displays obvious gradient variations on different LUTs,with the highest in“Rural areas”,second in“Suburban areas”and lowest in“Urban areas”.

关键词： OMI FNR Precursors emission Meteorology land use type Grey Relation Analysis

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Elevation and land use types Have Significant Impacts on Spatial Variability of Soil Organic Matter Content in Hani Terraced Field of Yuanyang County,China

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Rice science 2015年第1期22卷 27-34页

作者： LI Feng-bo LU Guang-de ZHOU Xi-yue NI Hui-xiang XU Chun-chun YUE Chao YANG Xiu-mei FENG Jin-fei FANG Fu-ping Rice Science & Technology Information Center China National Rice Research Institute Agro-Tech Extension Center of Yuanyang

Soil organic matter （SOM） content is one of the most important indicators of the sustainability of soil. To maintain sustainable soil utilization and management in fragile Hani terraced field, it is meaningful to investigate the effects of topography and land use type on SOM content. Descriptive statistics and geostatistics were used to analyze the data and the kriging method was applied to map the spatial patterns of SOM content. The results showed that the mean SOM content was 32.76 g/kg, with a variation coefficient of 40%. The SOM content was affected by elevation and land use type. As the increase of elevation, the SOM content in Hani terraced field also increased obviously. The SOM content in tea garden, which is almost at high elevation, was the highest in all six land use types, and the SOM content decreased in a following sequence： tea garden 〉 paddy field 〉 corn field 〉 banana garden 〉 cassava field 〉 sugarcane field. In addition, at the same elevation, the paddy field had the highest SOM content compared with other land use types. All these results demonstrate that paddy field is the most efficient and suitable land use type for SOM conservation at high, middle or low elevations in the fragile Hani terraced field. In order to protect soil quality and maintain the sustainable agricultural development, it is necessary to maintain or even to enlarge the area of paddy field in Yuanyang county, Yunnan Province, China.

关键词： Hani terraced field elevation land use type geostatistics soil organic matter content

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Impacts of land use and salinization on soil inorganic and organic carbon in the middle-lower Yellow River Delta

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Pedosphere 2021年第6期31卷 839-848页

作者： Yang GUO Xiujun WANG Xianglan LI Minggang XU Yuan LI Haonan ZHENG Yongming LUO Pete SMITH College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875(China) Institute of Agricultural Resources and Regional Planning Chinese Academy of Agriculture SciencesBeijing 100081(China) Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003(China) Institute of Biological and Environmental Sciences University of AberdeenAberdeen AB243UU(UK)

Soil inorganic carbon(SIC)is an important reservoir of carbon(C)in arid,semi-arid,and semi-humid regions.However,knowledge is incomplete on the dynamics of SIC and its relationship with soil organic C(SOC)under different land use types in the semi-humid region,particularly in coastal zones impacted by soil salinization.We collected 170 soil samples from 34 profiles across various land use types(maize-wheat,cotton,paddy,and reed)in the middle-lower Yellow River Delta(YRD),China.We measured soil pH,electrical conductivity(EC),water-soluble salts,and SOC and SIC contents.Our results showed significant differences in both SOC and SIC among land use types.The dry cropland(maize-wheat and cotton)soils had significantly higher SOC and SIC densities(4.71 and 15.46 kg C m^(-2),respectively)than the paddy soils(3.28 and 14.09 kg C m^(-2),respectively)in the 0–100 cm layer.Compared with paddy soils,reed soils contained significantly higher SOC(4.68 kg C m^(-2))and similar SIC(15.02 kg C m^(-2))densities.There was a significant positive correlation between SOC and SIC densities over a 0–100 cm soil depth in dry cropland soils,but a negative relationship in the paddy soils.On average,SOC and SIC densities under maize-wheat cropping were 15%and 4%lower,respectively,in the salt-affected soils in the middle-lower YRD than the upper YRD.This study indicated that land use types had great influences on both SOC and SIC and their relationship,and salinization had adverse effect on soil C storage in the YRD.

关键词： C densities C stocks land use type salt-affected soil soil salinization

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Differences of Soil Nutrient Contents under Different land use Patterns in Niyang River Basin

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Agricultural Biotechnology 2022年第2期11卷 80-84页

作者： Heping MA Zhu DONG Institute of Tibet Plateau Ecology Agriculture&Animal Husbandry UniversityNyingchi 860000China National Key Station of Field Scientific Observation&Experiment Nyingchi 860000China Tibet Key Laboratory of Forest Ecology in Plateau Area Nyingchi 860000China

[Objectives]This study was conducted to investigate the variation characteristics of soil nutrient contents under different land use patterns in the middle and upper reaches of the Niyang River in Tibet.[Methods]With the cultivated land,grass land and forest land in the middle and upper reaches of the Niyang River as the research objects,216 soil samples were collected in layers(0-10,10-20,20-30 cm)by the standard sampling method,and the soil total nitrogen,alkali-hydrolyzable nitrogen,total potassium,available potassium,total phosphorus,available phosphorus and organic matter were determined.[Results]The contents of soil organic matter,total nitrogen and alkali-hydrolyzable nitrogen in the middle and upper reaches of Niyang River in Tibet ranked as forest land>grass land>cultivated land,and there were significant differences between the three(Pland and forest land were not much different,and the contents of available potassium exhibited an order of forest land>grass land>cultivated land.The distribution of soil total nutrients and available nutrients under different land use patterns showed a certain degree of surface aggregation.The contents of total nutrients and available nutrients in the soil at the 0-10 cm depth were significantly higher than those at 10-20 and 20-30 cm,and there were significant differences between the three(Pland under the three land use patterns in the study area.The average content of soil available phosphorus in cultivated land(19.47 mg/kg)was significantly higher than those in grass land(5.73 mg/kg)and forest land(5.19 mg/kg).The above results indicate that long-term vegetation restoration can improve the soil quality of the middle and upper reaches of the Niyang River.[Conclusions]The results of this study research provide basic support for improving the soil effect in the area.

关键词： Soil nutrient land use type Soil quality Available nutrient Tibet

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Soil Physical Properties of Different land use types in Loess Hilly Region

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Asian Agricultural Research 2021年第5期13卷 11-13页

作者： Tingting MENG Jinbo LIU Shaanxi Provincial land Engineering Construction Group Co. Ltd.Xi'an 710075China Institute of land Engineering and Technology Shaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi'an 710075China Key Laboratory of Degraded and Unused land Consolidation Engineering Ministry of Natural ResourcesXi'an 710075China Shaanxi Provincial land Consolidation Engineering Technology Research Center Xi'an 710075China land Engineering Technology Innovation Center Ministry of Natural ResourcesXi'an 710075China

[Objectives]To explore the impact of land use changes on physical properties of soil in loess hilly region.[Methods]The methods of field sampling and indoor analysis were adopted.Farmland in a small watershed in the middle of the Loess Plateau,grassland that had been abandoned for 7 years,grassland that had been abandoned for 30 years,jujube orchard and ditch were sampled,and the particle composition(clay,silt and sand)and moisture changes of the soil in the top 0-100 cm were studied.[Results]In the small watershed,the top 0-100 cm of the soil was composed of 14%clay,70%silt and 16%sand.The contents of clay,silt and sand in the grassland that had been abandoned for 30 years varied greatly,while varied little in the land of other use types.The soil moisture content of grassland that had been abandoned for 30 years,jujube orchard,grassland that had been abandoned for 7 years,farmland and ditch increased with the increase of depth,with means of 10.29%,11.66%,10.08%,11.43%and 11.34%,respectively.[Conclusions]This study provides a theoretical basis for the growth of crops of different land use types in the loess hilly region.

关键词： Loess hilly region land use type Particle composition Soil moisture

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Nitrogen addition reduced carbon mineralization of aggregates in forest soils but enhanced in paddy soils in South China

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Ecological Processes 2021年第1期10卷 597-607页

作者： Ruirui Cao Longchi Chen Xincun Hou Xiaotao Lü Haimei Li College of landscape Architecture and Forestry Qingdao Agricultural UniversityQingdao 266109China. Huitong Experimental Station of Forest Ecology CAS Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyChinese Academy of SciencesShenyang 110016China. Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest Huitong National Research Station of Forest EcosystemHuitong 418307China. Research and Development Center for Grasses and Environment Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China.

Background:Despite the crucial role of nitrogen(N)availability in carbon(C)cycling in terrestrial ecosystems,soil organic C(SOC)mineralization in different sizes of soil aggregates under various land use types and their responses to N addition is not well understood.To investigate the responses of soil C mineralization in different sized aggregates and land use types to N addition,an incubation experiment was conducted with three aggregate-size classes(2000,250,and 53μm)and two land use types(a Chinese fir plantation and a paddy land).Results:Cumulative C mineralization of theland use types.N addition has different effects on soil C mineralization in different land use types.These results highlight the importance of soil aggregates and land use types in the effects of N deposition on the global terrestrial ecosystem C cycle.

关键词： Ultisol land use type Microaggregates Soil organic carbon

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Changes in soil carbon stocks and related soil properties along a 50-year grassland-to-cropland conversion chronosequence in an agro-pastoral ecotone of Inner Mongolia,China

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Journal of Arid land 2012年第4期4卷 420-430页

作者： Yan JIAO Zhu XU JiaoHong ZHAO WenZhu YANG College of Chemistry and Environmental Sciences Inner Mongolia Normal UniversityHohhot 010018China Grassland Research Institute of Chinese Academy of Agriculture Science Hohhot 010018China

land use change significantly influences soil properties. There is little information available on the long-term effects of post-reclamation from grassland to cropland on soil properties. We compared soil carbon （C） and nitrogen （N） storage and related soil properties in a 50-year cultivation chronosequence of grassland in the agro-pastoral ecotone of Inner Mongolia. Field surveys on land use changes during the period of 1955-2002 were conducted to build a chronosequence of cropland of different ages since the conversion from grassland. The results showed that soil C and N storage, soil texture, and soil nutrient contents varied with land use types and cropland ages （P〈0.01）. In the 0-30 cm soil layer, the soil organic carbon （SOC） density was significantly lower in the crop- lands （3.28 kg C/m2 for C50 soil） than in the grasslands （6.32 kg C/m2）. After 5, 10, 15, 20, 35, and 50 years of crop planting （years since the onset of cultivation）, the SOC losses were 17%, 12%, 19%, 47%, 46%, and 48%, respec- tively, compared with the grasslands. The soil total nitrogen （TN） density of the grasslands was 65 g N/m2, and TN density of the cropland soil was 35 g N/m2 after 50 years of crop planting. Both the SOC and TN densities could be quantitatively determined by a negative exponential function of cropland age （P〈0.0001, R2=0.8528; P〈0.0001, R2=0.9637）. The dissolved organic carbon （DOC） content, pH value were decreased; and the soil bulk density and soil available potassium （AK） content, clay content, and sand content were increased since the conversion of grassland into cropland during the 50-year period. Our results show soil nutrients were higher in grassland than in cropland. The conversion of grasslands to croplands induced a loss of soil C storage and changes of related soil properties. The reclamation time of cultivated soil （cropland age） had significant effects on soil properties in the study area.

关键词： land use type cropland age grassland soil physical-chemical properties agro-pastoral ecotone

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The Heterogeneity and Its Influencing Factors of Soil Nutrients in Peak-Cluster Depression Areas of Karst Region

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Agricultural Sciences in China 2007年第3期6卷 322-329页

作者： ZHANG Wei CHEN Hong-song WANG Ke-lin SU Yi-rong ZHANG Ji-guang YI Ai-jun Institute of Subtropical Agriculture The Chinese Academy of Sciences Changsha 410125 P.R.China Huanjiang Experimental Station of Karst Ecosystem Huanjiang 547100 P.R.China Graduate School Chinese Academy of Sciences Beijing 100049 P.R.China

By selecting a typical peak-cluster depression area of karst region in Southwest China, we evaluated the effect of land use types and topographic factors on soil nutrients. Grid and line sampling methods were used to sample soil in depression and slope lands respectively, and classical statistical tools were applied to analyze the spatial variability character of soil organic carbon （SOC）, total nitrogen （TN）, total phosphorus （TP）, total potassium （TK）, available nitrogen （AN）, available phosphorus （AP）, available potassium （AK）, pH, and C/N. It was found that land use type was the dominant factor that effected the spatial heterogeneity of SOC, TN, TP, TK, AN, and AP. The content of SOC, TN, and AN decreased with the increase of land use intensity. Due to high fertilizer input, TP and AP in tillage fields were higher than those in the other land use types. TK had no obvious change trend among various land use types. Topographic factors had a significant effect on SOC, TN, TP, AN, AP, AK, and pH. Habitat factor was the dominant factor that effected AK. Altitude factor was the dominant factor for pH. However, all of these factors had no significant effect on C/N. Tillage practice had important effect on soil nutrients loss and soil degradation in the fragile karst ecosystem, and the input of organic manure should be increased in this region.

关键词： karst peak-cluster depression soil nutrient land use type topography factors soil organic carbon

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Variation of Surface Soil Water Contentin two types of land use in Nanjing suburb

Variation of Surface Soil Water Contentin two types of land ...

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2015海峡两岸水土保持学术研讨会

作者： Zhuang Jiayao Wu Huqiang Shao Yongchang Lab of water and soil conservation Nanjing forestry university

Oak forest and grassland in the Tongshan forestry farm in Nanjing,China were selected,within which,4 sets EM50 was used to measure Soil Volumetric Water Content（DASVWC）at depths of 5cm,15cm,30cm respectively and air humidity was measured at the height of 2 m.All these data were recorded continuously for every 15 minutes during June,2010 to May,2011.Precipitation was measured in both two types of land use with a far distance transportation system for each mm precipitation.By analyzing the vertical-temporal variable quantity,variations of DASVWC and their correlation with meteorological factors,it was found that they were affected by precipitation,air temperature and humidity and DASVWC.Quite different from the variability law of DASVWC in the Yellow River watershed,where variability of DASVWC in the 5cm layer was lower than those in the 15 cm and 30 cm soil layer,in this research variability of DASVWC in the 0-5 layer was higher than those in the 15 cm and 30 cm soil layer in the two types of land use.DASVWC in oak forest in the 0-30 soil layer was lower compared with those in the grass land,showing decrease of DASVWC in the surface soil layer with increase of plant coverage.In the same type of land use,values of DASVWC at three layers showed linear regression outstandingly.During rain intervals indifferent seasons,DASVWC showed exponential correlation with time very significantly.

关键词： Oak forest Grass land Soil volumetric water content land use type

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