文献类型：期刊文献

中文题名：高寒沙地不同林龄中间锦鸡儿的水分利用策略

英文题名：Water use strategy of different stand ages of Caragana intermedia in Alpine sandland

作者：刘丽颖[1] 贾志清[1] 朱雅娟[1] 刘君梅[1] 杨德福[2] 魏登贤[2]

第一作者：刘丽颖

机构：[1]中国林业科学研究院荒漠化研究所;[2]青海省治沙试验站

年份：2012

卷号：26

期号：5

起止页码：119-125

中文期刊名：干旱区资源与环境

外文期刊名：Journal of Arid Land Resources and Environment

收录：;北大核心:【北大核心2011】；CSSCI:【CSSCI_E2012_2013】；CSCD:【CSCD2011_2012】；

基金：中国林业科学研究院林业研究所重点项目"优良沙生植物抗逆性及其栽培技术试验研究"(ZD200908);国家"十一五"科技支撑计划专题"防沙治沙植物材料筛选与扩繁技术研究"(2006BAD26B0101)资助

语种：中文

中文关键词：水分来源;水分利用效率;稳定氢同位素比率;稳定氧同位素比率;稳定碳同位素比率

外文关键词：8 O;water source; water use efficiency; δD;δ 18 δ13C

分类号：Q948.112.3

摘要：中间锦鸡儿是青海共和盆地高寒沙地的主要造林灌木树种之一。文中利用稳定同位素技术,测定共和盆地不同林龄(5a,9a,25a)中间锦鸡儿枝条木质部和土壤各层(10,20,30,50,100,150,200cm)水分的δD值、δ18O值,分析它们是否随林龄变化而选择性地利用不同深度的土壤水分;并通过测定不同林龄中间锦鸡儿叶片的δ13C值,分析比较它们的长期水分利用效率。结果表明:5a,9a和25a中间锦鸡儿均主要利用源自降雨的土壤浅层10-50cm的水分。3个林龄中间锦鸡儿的水分利用效率差异显著(P<0.05),5a中间锦鸡儿明显高于9a和25a中间锦鸡儿,9a和25a中间锦鸡儿水分利用效率类似。水分利用策略的分析结果表明,中间锦鸡儿在发育低龄期,采取提高水分利用效率的方法来应对干旱胁迫。25a中间锦鸡儿未发生明显退化。
Caragana intermedia is one of main shrubs for afforestation in Alpine sandland of Gonghe Basin, Qinghai Province. Stable isotope technique was used to test the ~D and ~18 O value of water in rain, well, branch xylem and different soil depth （10, 20, 30, 50, 100, 150, 200 cm） of 5 years, 9 years and 25 years C. inter- media plantation, and then the differences of main water source among three ages of C. intermedia were ana- lyzed. Also, the 813C value of leaves was tested to evaluate the water use efficiency （WUE） of three ages of C. intermedia. Comparison of bD and ~180 showed that 5 years, 9 years and 25 years of C. intermedia stands used the water in 10-50 cm soil which came from rainwater. The differences of leaf 813C values among 5 years, 9 years and 25 years C. intermedia were significant; 5 years C. intermedia had exclusively high WUE, whereas that of 9 years and 25 years C. intermedia were similar. The water source and WUE suggest that 5 years C. inter- media adapted to drought stress by increasing WUE. And 25 years C. intermedia was not degenerated obviously.