文献类型：期刊文献

中文题名：降雨对高寒沙地不同林龄中间锦鸡儿水分利用特征的影响

英文题名：Effects of precipitation on water use characteristics of Caragana intermedia plantations with different stand ages in alpine sandy land

作者：高娅[1,3] 何凌仙子[2,3] 贾志清[1,3] 李清雪[2,3] 戴捷[2,3]

第一作者：高娅

机构：[1]中国林业科学研究院林业研究所,北京100091;[2]青海共和荒漠生态系统定位观测研究站,北京100091;[3]中国林业科学研究院荒漠化研究所,青海共和813005

年份：2021

卷号：32

期号：6

起止页码：1935-1942

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；PubMed;

基金：中国林业科学研究院林业研究所林木培育重点实验室专项资金项目(ZDRIF201903);国家自然科学基金项目(31670706)资助。

语种：中文

中文关键词：高寒沙地;中间锦鸡儿;稳定同位素;水分来源;地下水;降雨

外文关键词：alpine sandy land;Caragana intermedia;stable isotope;water source;groundwater;precipitation

分类号：S793.3

摘要：为明确不同林龄中间锦鸡儿水分来源对降雨的响应,利用稳定同位素技术测定青海共和盆地不同林龄的中间锦鸡儿(4 a、9 a、17 a和31 a)在降雨前后土壤水、木质部水、地下水和雨水的δ^(2)H、δ^(18)O组成,运用Iso-Source模型计算植物对各潜在水源的利用比例。结果表明:各林龄中间锦鸡儿的浅层(0~40 cm)土壤水δ^(2)H、δ^(18)O组成对降雨的响应最明显;降雨前后各林龄中间锦鸡儿的木质部水、土壤水分和地下水同位素值均位于当地大气降水线(LMWL)的右下侧,其截距和斜率均小于LMWL和全球大气降水线(GMWL),且降雨后中间锦鸡儿的木质部水和土壤水的同位素组成更趋近LMWL;降雨前,4 a和9 a中间锦鸡儿主要利用浅层土壤水,17 a中间锦鸡儿主要利用中层(40~90 cm)土壤水,31 a中间锦鸡儿主要利用深层土壤水;降雨后,各林龄中间锦鸡儿的吸水层位均为降雨补充的浅层土壤水;各林龄对地下水的利用率仅有1.8%~11.9%。说明不同林龄中间锦鸡儿的水分来源对降雨的响应方式相同,均优先利用降雨补充的浅层土壤水,对地下水的利用减少。
To clarify the changes of water sources for Caragana intermedia plantations at different ages(4,9,17 and 31 years)in response to rainfall in the Gonghe Basin of Qinghai Province,China,we used the stable isotope technique to identifyδ^(2)H andδ^(18)O compositions of soil water,xylem water,groundwater,and rain water before and after rainfalls.The proportions of different water sources were calculated by the Iso-Source model.The results showed that theδ^(2)H andδ^(18)O compositions of the shallow soil layer(0-40 cm)of all plantations responded significantly to the precipitation.The isotopic values of plant xylem water,soil water,and groundwater of each plantation were spotted on the lower right of the local meteoric water line(LMWL)either before or after rainfall,with lower intercepts and slopes than LMWL and the global meteoric water line(GMWL).The isotopic compositions of xylem water and soil water of C.intermedia plantations were closer to LMWL after rainfall.The 4-and 9-year-old C.intermedia plantations mainly used shallow soil water,the 17-year-old plantation mainly used middle layer soil water(40-90 cm),and the 31-year-old plantation primarily use deep soil water before rainfall.After rainfall,the shallow soil layer became sources of water absorption for all plantations.The utilization proportions of groundwater for all plantations were only 1.8%-11.9%.In general,water sources of different aged C.intermedia plantations showed similar responses to rainfall,by primarily absorbing the shallow soil water supplied by rainfall and reducing the use of groundwater.