| 基于同位素分析研究山东禹城夏玉米水分来源 |
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| 引用本文： | 张景文,陈报章.基于同位素分析研究山东禹城夏玉米水分来源[J].水土保持学报,2017,31(4):99-104. |
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| 作者姓名： | 张景文 陈报章 |
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| 作者单位： | 1. 北京林业大学水土保持学院,北京,100083;2. 中国科学院地理科学与资源研究所,北京,100101 |
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| 基金项目： | 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) |
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| 摘 要： | 以2016年山东省禹城市夏玉米为研究对象,通过测定分析不同生长期内降水、土壤水、植物水、地下水、地表水的稳定氢氧同位素值,并利用直接对比法和多元线性混合模型,分析不同水源对夏玉米不同生长期贡献率,进而研究其水分来源。结果表明:禹城市大气降水线方程为δD=7.80δ18 O+8.61,其斜率和截距均小于全球大气降水线方程,表明降水在降落过程存在蒸发富集过程。夏玉米不同生长期水分来源存在差异,出苗期由于土壤含水量较低,植物主要利用浅层地下水且利用率为89.6%;拔节期降雨量丰富,夏玉米主要利用0—10cm表层土壤水,利用率为85.8%;抽穗期夏玉米主要利用10—60cm土壤水,利用率达62.9%;生长到灌浆期,根系分布在较深土层且20—100cm土壤含水量稳定,夏玉米主要利用20—100cm土壤水,利用率为69.7%;成熟期植物主要利用大于60cm的深层土壤水,利用率达96.1%,此时期土壤含水量较低且根系分布可达深层土壤。
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| 关 键 词： | 夏玉米 稳定氢氧同位素 水分来源 |
Isotope Analysis of Water Sources of Summer Corn in Yucheng of Shandong |
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| ZHANG Jingwen,CHEN Baozhang.Isotope Analysis of Water Sources of Summer Corn in Yucheng of Shandong[J].Journal of Soil and Water Conservation,2017,31(4):99-104. |
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| Authors: | ZHANG Jingwen CHEN Baozhang |
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| Institution: | 1.College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083; 2.Institute of Geographical Science and Resources, Chinese Academy of Sciences, Beijing 100101 |
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| Abstract: | 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 was δD=7.80 δ18O +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 rainfall-abundant jointing stage,it mainly imbibed water from the 0-10 cm soil layer,and the contribution was 85.8％.During the heading stage,it mainly imbibed water from the 10-60 cm soil layer,and the contribution was 62.9％.The corn mainly used water from deeper soil layer during the filling stage (20-100 cm,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％. |
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| Keywords: | summer corn the stable hydrogen and oxygen isotopes water source |
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