摘要
于2005-07在祁连山北坡沿海拔梯度进行了青海云杉(Picea crassifolia)叶片稳定性碳同位素组成(δ13C)的分析测定,以探讨青海云杉叶片δ13C随海拔变化特征及对水分、温度变化的响应。结果表明:不同海拔青海云杉叶片δ13C存在显著差异(F=3.94,p<0.01),δ13C平均值-24.69‰;随着水分、温度的变化,在海拔2550～3100m,青海云杉叶片δ13C随海拔增加呈现降低趋势,在海拔3100～3350m,δ13C值随海拔增加呈现升高趋势。青海云杉叶片δ13C与土壤水分在低海拔(2550～3100m)呈显著负相关,在高海拔没有关系;与土壤温度之间则存在一种非线性关系。青海云杉叶片δ13C随海拔变化在低海拔主要受土壤水分、温度的控制,在高海拔则主要受温度的控制。
Variation pattern of Picea crassifolia leaf δ13C along the altitude gradient were investigated in the northern slope of Qilian Mountains in July, 2005. Results showed that Picea crassifolia leaf δ13C differed significantly among elevations(F=3.94, p<0.01), averaged by -24.69‰. Moreover, with water and temperature variation, leaf δ13C declined with increasing altitude at lower elevation of 2 550 m to 3 100 m, whereas, increased with altitude at higher elevation of 3 100 m to 3 350 m. Leaf δ13C was negatively related to soil water content at lower elevation of 2 550 m to 3 100 m, but not at higher elevation of 3 100 m to 3 350 m. Additionally, a nonlinear relation was observed between leaf δ13C and soil temperature. Shift pattern of Picea crassifolia leaf δ13C along the altitude gradient was linked to the local semiarid and cold climate, at lower elevations, soil water availability and temperature were most responsible for the pattern, while at higher elevations, low temperature accountted for the results.
出处
《山地学报》
CSCD
北大核心
2010年第6期712-717,共6页
Mountain Research
基金
国家科技支撑项目(2007BAB23C03)
国家重点基础研究发展计划项目“青藏高原环境变化及其对全球变化的响应与适应对策”(2005CB422005)~~
