浑善达克沙地南缘黄柳林地不同水体氢氧同位素特征  

Characteristics of Hydrogen and Oxygen Isotopes in Different Water Bodies of Salix Gordejevii Forest in the South Edgeof Hunshandake Sand Land

作　　者：杨丽娜 贾德彬[1] 高瑞忠[1] 苏文旭 卢方园 温都日根 YANG Lina;JIA Debin;GAO Ruizhong;SU Wenxu;LU Fangyuan;WENDU Rigen(Schol of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot O10010,China;Zhenglan Banner grassland work station,Inner Mongolia Zhenglan Banner 027200,China)

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,呼和浩特010010 [2]正蓝旗草原工作站,内蒙古正蓝旗027200

出　　处：《地球与环境》2022年第5期630-638,共9页Earth and Environment

基　　金：国家自然科学基金项目(51869018)。

摘　　要：本文选取浑善达克沙地南缘正蓝旗的黄柳林地为研究对象,通过2020年5月至10月野外采集降水、土壤、地下水、植物茎干分析各水体的稳定氢氧同位素特征,比较各水体之间同位素关系。研究发现:①土壤水线和植物茎干水线的斜率均小于当地大气降水线,各水体同位素富集程度为地下水<降水<土壤水<植物茎干水,降水的稳定性最差,变异性较大;②由于蒸发和降水入渗,浅层土壤δ^(18)O值和土壤含水量变化显著,而中深层水分受影响较小。降水中的δ^(18)O值相对于浅层土壤水偏正,并且土壤水的δ^(18)O值从浅层到深层逐渐呈偏负趋势,雨后各层土壤水波动的峰值出现有一定的时间推迟。③黄柳在生长季节主要利用浅层土壤水,各月对其利用率分别为96.20%、90.60%、84.90%、95.50%、86.70%和86.50%,随降水的减少也利用了中深层水;论文通过对黄柳林地内各水体的同位素变化特征的研究,摸清了土壤-植物-大气连续体中不同水体的同位素组成及其相互关系,对于揭示区域水循环的过程和机制至关重要,为浑善达克沙地防护林生态系统的生态水文过程研究提供理论依据。In this paper,the Salix gordejevii forest in Zhenglan Banner on the southern edge of Hunshandak Sandy Land is selected as the research object.Through the field collection of precipitation,soil,groundwater and plant stems from May to October 2020,the stable hydrogen and oxygen isotope characteristics of each water body were analyzed and the isotopic relationship between each water body was compared.The results show that:(1)The slopes of soil water line and plant stem water line are less than the local atmospheric precipitation line.The isotopic enrichment degree of each water body is groundwater<precipitation<soil water<plant stem water.The stability of precipitation is the worst and the variability is large;(2)δ^(18)O value of shallow soil and soil water content changed significantly due to the evaporation and precipitation infiltration,but the middle and deep water was less affected.δ^(18)O value in precipitation is positive relative to the shallow soil water,and the soil waterδ^(18)O value changes more negatively from the shallow layer to the deep layer,and the peak value of soil water in each layer was delayed after rain.(3)In the growing season,Salix gordejevii mainly uses shallow soil water,and its utilization rates in each month are 96.20%,90.60%,84.90%,95.50%,86.70%and 86.50%during May to October,respectively.With the decrease of precipitation,deep water is also used.By studying the isotopic variation characteristics of water bodies in Salix gordejevii forest,this paper finds out the isotopic composition and relationship of different water bodies in the soil-plant-atmosphere system,which is very important to reveal the process and mechanism of regional water cycle,and provides a theoretical basis for the study of eco-hydrological process of protective forest ecosystem in Hunshandake Sandy Land.

关 键 词：稳定氢氧同位素 黄柳 利用率 浑善达克沙地 

分 类 号：P597.2[天文地球—地球化学]