玛纳斯河流域土壤水稳定同位素特征及运移机制

李雅琴; 李发东; 张秋英; 乔云峰; 李俊峰; 田超; KHASANOV Sayidjakhon; 李艳红; 何新林

文章摘要

玛纳斯河流域土壤水稳定同位素特征及运移机制

Stable isotopic characteristics and soil moisture migration mechanisms in the Manas River basin

Received:June 02, 2021

DOI：10.13254/j.jare.2021.0351

中文关键词: 稳定同位素，土壤水，农田，玛纳斯河流域

英文关键词: stable isotope, soil water, farmland, Manas River basin

基金项目:国家自然科学基金重点项目-新疆联合基金重点项目（U1803244）；新疆生产建设兵团科技计划项目（2021BC003）

Author Name	Affiliation	E-mail
LI Yaqin	College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China
LI Fadong	College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Yucheng National Field Scientific Observation and Research Station for Farmland Ecosystem Shandong, Yucheng 251200, China College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China	lifadong@igsnrr.ac.cn
ZHANG Qiuying	Chinese Research Academy of Environmental Sciences, Beijing 100012, China
QIAO Yunfeng	Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Yucheng National Field Scientific Observation and Research Station for Farmland Ecosystem Shandong, Yucheng 251200, China College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
LI Junfeng	College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China
TIAN Chao	Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Yucheng National Field Scientific Observation and Research Station for Farmland Ecosystem Shandong, Yucheng 251200, China
KHASANOV Sayidjakhon	Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Yucheng National Field Scientific Observation and Research Station for Farmland Ecosystem Shandong, Yucheng 251200, China College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
LI Yanhong	College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
HE Xinlin	College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China

Hits: 1265

Download times: 1369

中文摘要:

干旱区土壤水分垂直方向运移与分配，特别是膜下滴灌绿洲地区土壤水分垂直方向分布现状与运移机制尚不清楚。为探究干旱区农田生态系统水分层贡献问题，阐明农田土壤中水分运移过程，于2019年沿新疆玛纳斯河流域农田土壤进行分层采样，依次为0~5、5~10、10~20、20~40、40~60、60~80、80~100 cm。测定了稳定同位素δD和δ¹⁸O值，对同位素δD和δ¹⁸O值进行数据分析。结果表明： δD和δ¹⁸O最大值位于0~5 cm土层，分别为-25.64‰和-0.19‰； δD和δ¹⁸O最小值位于20~40 cm土层，分别为-108.32‰和-8.19‰。0~5 cm土层δD和δ¹⁸O值较高，表明上层比下层更易受水分蒸发作用影响，存在强蒸发效应。随土层深度增加，δD和δ¹⁸O值呈减小趋势，其中80~100 cm土层变化趋势缓慢。氘盈余值表现为山地>平原>荒漠>山前。研究表明，受长期膜下滴灌影响，加之蒸发作用强烈，玛纳斯河流域土壤水分迁移过程发生改变。

英文摘要:

Soil moisture distribution and vertical movement in arid areas, especially in oasis areas with drip irrigation under mulch, remain unclear. This study's objectives are to scientifically explore the contribution of the soil moisture layer to farmland ecosystems in arid areas, and to clarify the process of water transport in farmland soil. In 2019, we collected stratified soil samples from farmlands spanning the Manas River basin in Xinjiang, with sampling layers of 0~5, 5~10, 10~20, 20~40, 40~60, 60~80 cm, and 80~100 cm. Stable isotope δD and δ¹⁸O values were determined, and data analysis was performed. Maximum values of δD and δ¹⁸O(-25.64‰ and -0.19‰, respectively) are located in the 0~5 cm soil layer. Minimum values(-108.32‰ and -8.19‰, respectively) are in the 20~40 cm soil layer. The δD and δ¹⁸O values in the 0~5 cm soil layer were enriched, indicating that the upper layer was more susceptible to water evaporation than the lower layer, with a strong evaporation effect. As soil depth increased, δD and δ¹⁸O values displayed a decreasing trend, which slows down in the 80~100 cm soil layer. The excess δD value were ordered:mountainous > plain > desert > piedmont region. In conclusion, due to long-term mulch drip irrigation and intense evaporation from surface soil, the water migration process changes with change in soil profile.

HTML View Full Text View/Add Comment Download reader