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Effective root depth and water uptake ability of winter wheat by using water stable isotopes in the Loess Plateau of China

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International Journal of Agricultural and Biological Engineering 2016年第6期9卷 27-35页

作者： Wang Bing Zheng Lijian Ma Juanjuan Sun Xihuan Guo Xianghong Guo Fei College of water Resource Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Conservancy Technical College Yuncheng 044004China

A field experiment using PVC growth tubes was conducted in the Loess Plateau of China to determine the effective root depth(ERD)of winter wheat and its relationship with root distributions and soil water conditions.The water stable isotopes technique was used to estimate the water uptake contributions of different root depths during the growth stages.On the basis of IsoSource and the Romero-Saltos model,the ERD was 0-40 cm in the majority of the growth stage.However,in the heading and filling stages,the ERD could reach 60%-75%of the maximum root depth.Furthermore,the contributions to water uptake of different root depths were correlated with variations in soil water and root length density(r=0.395 and 0.368,respectively;pwater content did not always follow the same trend as water uptake.The conclusions of this study can help with understanding winter wheat water uptake mechanisms in arid and semi-arid regions and increasing water use efficiency.

关键词： effective root depth water stable isotopes water uptake root distribution soil water content

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Estimation of evaporation losses based on stable isotopes of stream water in a mountain watershed

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Acta Geochimica 2021年第2期40卷 176-183页

作者： Zhongcong Sun Chaochen Hu Di Wu Guopeng Chen Xiaoqiang Lu Xueyan Liu School of Earth System Science Tianjin UniversityTianjin 300072China College of Forestry Gansu Agricultural UniversityLanzhou 730070Gansu ProvinceChina Key Laboratory of Biosafety Nanjing Institute of Environmental SciencesMinistry of Ecology and EnvironmentNanjing 210042JiangsuChina

water stable isotopes(δ^(2) H andδ^(18)O)can record surface water evaporation,which is an important hydrological process for understanding watershed structure and function evolution.However,the isotopic estimation of water evaporation losses in the mountain watersheds remains poorly explored,which hinders understanding spatial variations of hydrological processes and their relationships with the temperature and vegetation.Here we investigatedδ^(2) H,δ^(18)O,and d-excess values of stream water along an altitude gradient of 2130 to 3380 m in Guan’egou mountain watershed at the east edge of the Qinghai-Tibet Plateau in China.The meanδ^(2) H(-69.6‰±2.6‰),δ^(18)O(-10.7‰±0.3‰),and dexcess values(16.0‰±1.4‰)of stream water indicate the inland moisture as the major source of precipitation in study area.water stable isotopes increase linearly with decreasing altitudes,based on which we estimated the fractions of water evaporation losses along with the altitude and their variations in different vegetations.This study provides an isotopic evaluation method of water evaporation status in mountain watersheds,the results are useful for further understanding the relationship between hydrological processes and ecosystem function under the changing climate surrounding the Qinghai-Tibet Plateau.

关键词： water stable isotopes Mountain watersheds water evaporation losses Altitude effect Rayleigh fractionation

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Isotopic evidence for soil water sources and reciprocal movement in a semi-arid degraded wetland:Implications for wetland restoration

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Fundamental Research 2023年第6期3卷 861-867页

作者： Yuanchun Zou Sijian Zhang Xiaofei Yu Guobin Fu Xianguo Lu Heilongjiang Xingkai Lake Wetland Ecosystem National Observation and Research Station&Key Laboratory of Wetland Ecology and Environment&Jilin Provincial Joint Key Laboratory of Changbai Mountain Wetland and Ecology Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China State Environmental Protection Key Laboratory for Wetland Conservation and Vegetation Restoration&Jilin Provincial Key Laboratory of Ecological Restoration and Ecosystem Management&Key Laboratory of Vegetation Ecology of Ministry of Education School of EnvironmentNortheast Normal UniversityChangchun 130117China CSIRO Land and water Private Bag 5WembleyWA 6913Australia

Understanding water dynamics is a prerequisite for the restoration of degraded ecosystems in arid and semiarid regions.In this study,we carried out δD and δ^(18)O analyses of precipitation,unsaturated soil water,overland flow,surface runoff,and groundwater samples from a seasonally flooded wetland in the Momoge National Nature Reserve of the Songnen Plain,Northeast China,to identify the water sources and understand the mechanisms of unsaturated soil water movement.Unsaturated soil water content(W/W%)at every 20 cm along with a soil profile(0–100 cm)was collected during the growing season,and the HYDRUS-1D model was used to simulate temporal-spatial variations.The results showed that the local meteoric water line(δD=5.90δ18O-7.34,R2=0.95)had a smaller slope and intercept than the global meteoric water line because of strong evaporation at our study site under semi-arid climate.The groundwater was partly recharged by local precipitation via overland flow and unsaturated soil water infiltration.Unsaturated soil water was sourced from both precipitation and groundwater with variations at different depths.The upper soil layer at 0–15 cm was mainly sourced from limited precipitation,while the groundwater could move up to a 25 cm layer during the dry period.The unsaturated soil water content increased with soil depth in the top 40 cm,decreased at depths of 40 to 80 cm,and increased again at depths of 80 to 100 cm.The HYDRUS-1D model could simulate the unsaturated soil water dynamics well in the upper(0–40 cm)and lower(80–100 cm)sections,but poorly for depths of 40–80 cm due to the upward and downward flow.The bidirectional unsaturated soil water movement highlights the importance of capillary groundwater for wetland plants with similar climatic or hydrogeological conditions.

关键词： water stable isotopes Unsaturated soil water sourcing HYDRUS-1D Degraded wetland restoration Songnen Plain

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