文章摘要
李荣磊, 黄来明, 裴艳武, 邵明安, 张应龙.毛乌素沙地圪丑沟小流域沙柳水分利用来源研究[J].水土保持学报,2021,35(2):122~130
毛乌素沙地圪丑沟小流域沙柳水分利用来源研究
Water Use Source of Salix psammophila in Gechougou Small Watershed of Mu Us Sandy Land
投稿时间:2020-09-20  
DOI:10.13870/j.cnki.stbcxb.2021.02.017
中文关键词: 毛乌素沙地  稳定同位素  水分来源  地下水  植被恢复
英文关键词: Mu Us Sandy Land  stable isotope  water source  groundwater  vegetation restoration
基金项目:国家自然科学基金项目(41601221);中国科学院战略性先导科技专项(XDA23070202);中国科学院青年创新促进会会员项目(2019052);中国科学院地理科学与资源研究所秉维优秀青年人才项目(2017RC203);中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室项目(A314021402-2010)
作者单位E-mail
李荣磊1,2, 黄来明1,3,4, 裴艳武1,2, 邵明安1,2,3,4, 张应龙5 1. 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101

2. 西北农林科技大学资源环境学院
, 陕西 杨凌 712100

3. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
, 陕西 杨凌 712100

4. 中国科学院大学资源与环境学院
, 北京 100049

5. 陕西省神木县生态协会
, 陕西 神木 719399 
huanglm@igsnrr.ac.cn 
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中文摘要:
      为探究毛乌素沙地典型治沙植物根系吸水来源及其影响因素,通过测定毛乌素沙地圪丑沟小流域沙柳(Salix psammophila)(18~20年)木质部水及其各种潜在水源(降水、土壤水和地下水)的氢氧同位素组成(δD和δ18O),利用多元线性混合模型(IsoSource)研究沙柳水分来源的季节变化特征及其影响因素。结果表明,监测期间(6-11月)沙柳木质部水、降水、土壤水和地下水的δD值变化范围分别为-82.41‰~-52.91‰,-144.81‰~-6.60‰,-96.94‰~-42.65‰和-86.42‰~-71.82‰,δ18O值变化范围分别为-10.77‰~-7.29‰,-18.86‰~-2.07‰,-12.85‰~-0.79‰和-10.86‰~-9.74‰。雨季(7-9月)降雨量和土壤含水量分别高于旱季(6,10,11月)24.80~90.10 mm和0.95%~1.84%,但6-9月地下水位却低于10-11月2~7 cm。沙柳根系在旱季6月主要利用深层土壤水(>200 cm)(33.70%)和地下水(26.20%),雨季(7-9月)逐渐转变为以吸收浅层土壤水(<200 cm)为主(50.70%~54.00%),10-11月由于气温降低、降水减少及沙柳生命活动减弱,浅层土壤水(<200 cm)对沙柳根系吸水的贡献高于雨季(7-9月)35.20%~40.00%,而地下水对沙柳根系吸水的贡献显著降低(<5.00%)。因此,沙柳根系对于毛乌素沙地季节性干旱具有较强的适应和调节能力,其吸水来源随降雨量、土壤含水量和地下水位季节波动而变化。
英文摘要:
      The hydrogen and oxygen isotopic compositions (δD and δ18O) of stem water and its potential sources (rain water, soil water, and groundwater) were measured monthly from June to November, 2018 in a Salix psammophila forest (18~20 years) in Gechougou watershed of Mu Us Sandy Land. The dynamic changes and controls of root water source were studied by the multiple linear mixed model (IsoSource). Results showed that the variation range of δD were -82.41‰~-52.91‰, -144.81‰~-6.60‰, -96.94‰~-42.65‰, and -86.42 ‰~-71.82‰ for stem water, rain water, soil water, and groundwater, respectively. The variation range of δ18O were -10.77‰~-7.29‰, -18.86‰~-2.07‰, -12.85‰~-0.79‰, and -10.86‰~-9.74‰, respectively, during the monitored period (June-November). Rainfall amount and soil water content in the rainy season (July-September) were 24.80~90.10 mm and 0.95%~1.84% higher than that in the dry season (June, October, and November). However, the groundwater level during June to September were 2~7 cm lower than that in October and November. In June, S. psammophila mainly used deep soil water (>200 cm) (33.70%) and groundwater (26.20%). From July to September, the root water source mainly came from shallow soil water (<200 cm) (50.70%~54.00%). Compared with the rainy season (July-September), the contribution of shallow soil water (<200 cm) to root water source remarkably increased by 35.20%~40.00% in October and November due to the low air temperature, rainfall amount, and weak life activity of S. psammophila. There was a significant reduction in the use of groundwater in October and November (<5.00%). Therefore, S. psammophilais adaptable to the seasonal drought and is suitable for desertification control in the Mu Us Sandy Land. The root water source of S. psammophila changed with seasonal variations of rainfall amount, soil profile water content, and groundwater level.
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