水科学进展2016，Vol.27Issue(4)：529-534,6.DOI:10.14042/j.cnki.32.1309.2016.04.006
黄土高原丘陵沟壑区包气带土壤水运移过程
Migration process of soil water in the unsaturated zone of the Loess Plateau
摘要
Abstract
The mechanism of soil water migration in the reconstruction and restoration of the Loess Plateau is a key scientific problem that must be solved. Isotopic tracers can provide valuable information associated with complex hydro⁃logical problems and are difficult to obtain by other methods. This study investigated soil water migration in the unsatu⁃rated zone in the hilly and gully region of the Loess Plateau. Samples were collected from the 0—150 cm unsaturated zone, including precipitation, soil water content, plant xylems, and plant roots, and were analysed. The results showed that the isotopic composition of precipitation in the Yangjuangou River basin was affected by evaporation, as indicated by isotopic fractionation phenomena. The δD and δ18 O isotopic profiles of the soil water exhibited monthly variations. The soil water was recharged by precipitation. The soil water and precipitation were taken up by shrubland. Water migration exhibited a transformation pathway from precipitation to soil water to plant water. Shrubland root sys⁃tems were distributed in the shallow layer. Root and water uptake increased at a depth of 20—40 cm. The isotopic composition of xylem water was close to that of soil water at a depth of 20—40 cm. These values reflect soil water sig⁃natures associated with shrubland uptake at a depth of 20—40 cm. This study investigate the migration process of soil water, identify the source of plant water use, and provide a scientific basis for the migration process of soil water, in⁃cluding model structure and parameter identification.关键词
土壤水/木质部水/水分来源/黄土高原/包气带Key words
soil water/xylem water/water sources/Loess Plateau/unsaturated zone分类
农业科技引用本文复制引用
杨永刚,李国琴,焦文涛,黄磊..黄土高原丘陵沟壑区包气带土壤水运移过程[J].水科学进展,2016,27(4):529-534,6.基金项目
国家自然科学基金重大资助项目（41390464）；中国博士后科学基金（2014M550095） The study is financially supported by the National Natural Science Foundation of China （ No．41390464）． （）
