北京林业大学学报2016，Vol.38Issue(7)：40-47,8.DOI:10.13332/j.1000-1522.20150514
北京山区栓皮栎林水分来源及生长季动态规律
Water use strategy of Quercus variabilis in Beijing mountainous area
摘要
Abstract
In order to understand water source of the dominant tree species Quercus variabilis and its ecophysiological adaptation during growing season in Beijing mountainous area, we studied the water use strategy of Q. variabilis under different soil moisture conditions during growing season. We employed the Iso-source software and measured theδD andδ18 O in branches, soil and groundwater to clarify their water source during growing season, by combining with ecophysiological factors, such as leaf water potential (ψ), stomatal conductance (Gs) and water use efficiency (WUE). The results showed that the Q. variabilis had different water sources with season varying: from April to June, it mainly utilized surface soil (0-30 cm) water, deep soil (80-100 cm) water and groundwater in a much balanced pattern;in July and August, the water source gradually shifted to deep soil water and groundwater, and almost no surface soil water was used; during September and October after the rainy season, the water source gradually shifted to the shallow layer soil water. During growing season, the seasonal fluctuation of soil moisture significantly affected Gs of Q. variabilis. Under good soil water conditions, Gs was higher and WUE is lower;under serious water shortage, Q. variabilis can reduce stomatal conductance to decrease water loss and obtain higher carbon assimilation rate and maintain higher water use efficiency, in order to adapt to the arid condition.关键词
栓皮栎/水分来源/水分利用策略/氢氧同位素Key words
Quercus variabilis/water source/water use strategy/hydrogen and oxygen isotopes分类
农业科技引用本文复制引用
刘自强,余新晓,娄源海,贾剑波,贾国栋,路伟伟..北京山区栓皮栎林水分来源及生长季动态规律[J].北京林业大学学报,2016,38(7):40-47,8.基金项目
青年科学基金项目(41401013)、国家自然科学基金面上项目(41430747)。 （41401013）
