黑河下游河岸林植物水分来源初步研究

被引：84

作者：

赵良菊 ^{[1
,2
]}

肖洪浪 ^{[1
]}

程国栋 ^{[2
]}

宋耀选 ^{[1
]}

赵亮 ^{[1
]}

李彩芝 ^{[1
]}

杨秋 ^{[1
]}

机构：

[1] 中国科学院寒区旱区环境与工程研究所黑河生态水文与流域科学重点实验室

[2] 中国科学院寒区旱区环境与工程研究所冻土国家重点实验室

来源：

地球学报 | 2008年 / 29卷 / 06期

基金：

中国博士后科学基金;

关键词：

稳定氧同位素; 黑河; 河岸林; 水分来源;

D O I：

暂无

中图分类号：

Q948 [植物生态学和植物地理学];

学科分类号：

071012 ; 0713 ;

摘要：

通过分析黑河下游极端干旱区荒漠河岸林植物木质部水及其不同潜在水源稳定氧同位素组成(δ18O),应用"同位素质量守恒多元"分析方法初步研究了不同潜在水源对河岸林植物的贡献。结果表明:在黑河下游荒漠河岸林生态系统,在河水转化为地下水和土壤水及水分在土壤剖面再分配的过程中均存在强烈的同位素分馏。对植物水δ18O而言,胡杨、柽柳和苦豆子的δ18O分别为-6.43‰、-6.28‰和-6.61‰,较苦苣菜(-5.14‰)和蒲公英(-5.52‰)明显偏负。柱状频率图显示胡杨最多能利用93%的地下水,柽柳最多利用90%的地下水。而苦豆子97%水分来源于80cm土层范围内的土壤水。除0～20cm土层内的土壤水外,苦苣菜和蒲公英可能还有其他潜在水源。即在黑河下游天然河岸林乔木和灌木较多地利用地下水,而草本植物仍然以地表水为主。

引用

页码：709 / 718

页数：10

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