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《Journal of Soil and Water Conservation》 2017-04
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Isotope Analysis of Water Sources of Summer Corn in Yucheng of Shandong

ZHANG Jingwen;CHEN Baozhang;College of Soil and Water Conservation,Beijing Forestry University;Institute of Geographical Science and Resources,Chinese Academy of Sciences;  
In this study,we used hydrogen and oxygen stable isotope tracer technique to determine the water isotopic compositions of precipitation,soil water,groundwater,surface water and xylem water for summer corn during the growing season in 2016 in Yucheng,Shandong Province.Both direct inference approach and multi-source linear mixed models(Iso-Source)were applied to estimate the sources of root water uptake and their contributions in different growing seasons of summer corn.The results showed that the linear model of precipitation wasδD=7.80δ18 O +8.61 for Yucheng,and the intercept and slope were less than the values of global precipitation model due to evaporation.Summer corn mainly used shallow groundwater during the seedling stage and the contribution was 89.6% due to the low soil moisture content.During the rainfallabundant jointing stage,it mainly imbibed water from the 0—10cm soil layer,and the contribution was85.8%.During the heading stage,it mainly imbibed water from the 10—60cm soil layer,and the contribution was 62.9%.The corn mainly used water from deeper soil layer during the filling stage(20—100cm,69.7%),because the root was in the deep soil layer and soil water content was stable.During the mature stage,it mainly imbibed water from the more than 60 cm soil layer with the low soil moisture content and the deep root,and the contribution was 96.1%.
【Key Words】: summer corn the stable hydrogen and oxygen isotopes water source
【Fund】: 国家自然科学基金面上项目“中国涡度相关通量塔空间代表性评估与碳源/汇尺度扩展研究”(41271116);; 中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室自主创新项目“星-空-地多源碳排放监测数据的融合同化和系统集成研究”(O88RA901YA)
【CateGory Index】: S513
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