北京山区侧柏利用水分来源对降水的响应

doi:10.11707/j.1001-7488.20180702

摘要/Abstract

摘要： [目的]探究降水不足的北京山区降水量变化对侧柏利用水分来源的影响，为了解侧柏对土壤干旱胁迫的响应提供理论依据。[方法]2015年7月，测定侧柏枝条及各潜在水源的稳定氢氧同位素（¹⁸O/¹⁶O、²H/¹H）比率，利用Iso-Source多元线性混合模型，计算2015年6月29日—7月1日3天不同降水梯度（A区：完全遮断自然降水，降水量0 mm；B区：遮挡自然降水的一半，降水量12.7 mm；C区：无遮挡自然降水，降水量25.4 mm；D区：将A区降水输入该区，形成双倍降水，降水量50.8 mm）下侧柏对各层土壤水和地下水的利用率。[结果]随降水量增加，侧柏表现出"二态"结构特征，其水分来源从深层逐渐向表层转移；A区侧柏主要吸收60~100 cm土层土壤水和地下水，利用率分别为31.5%和32.8%；B区侧柏与A区相似，对60~100 cm土层土壤水和地下水的利用率分别为28.1%和25.7%，对0~20、20~40和40~60 cm土层土壤水的利用率在15.4%左右；与B区相比，C区侧柏对60~100 cm土层土壤水和地下水的利用率有所减少，分别为19.8%和22.8%，对0~20和20~40 cm土层土壤水的利用率增加，分别为17.8%和22.9%；D区侧柏水分来源与C区相近，对0~20、20~40和60~100 cm土壤水和地下水都有利用，利用率为20.0%~25.2%。[结论]侧柏能根据水分条件调整对水源的利用率，这种适应水分环境的水分利用能力有利于侧柏度过极端干旱胁迫。

关键词: 侧柏, 降水梯度, 水分来源, 利用策略, 氢氧同位素, 北京山区

Abstract: [Objective]To explore the influence of precipitation on water sources for Platycladus orientalis in Beijing mountainous areas and to provide a theoretical basis for understanding the response of P. orientalis to soil drought stress.[Method]We determined the hydrogen and oxygen values of xylem and investigated the water sources of P. orientalis in different precipitation conditions(A:no precipitation, 0.0 mm; B:1/2 precipitation, 12.7 mm; C:natural precipitation, 25.4 mm, D:two times of precipitation, 50.8 mm) by Iso-Source model during the vigorous growing season.[Result]P. orientalis showed a "plasticity root system" structure. It absorbed water from deep to surface soil layer with the precipitation gradients. In treatment A, P. orientalis mainly absorbed water from 60-100 cm and groundwater; the utilization rate was 31.5% and 32.8%, respectively. Similarly, in treatment B, it obtained water from 60-100 cm and groundwater; the utilization rate was 28.1% and 25.7%, respectively. But in treatment C, P. orientalis absorbed water from layer of 60-100 cm and groundwater; the utilization rate was 19.8% and 22.8%, respectively. At the same time, it absorbed water from the surface 0-20 and 20-40 cm soil layer; the utilization rate was17.8% and 22.9%, respectively. The water source of P. orientalis in treatment D was 0-20, 20-40, and 60-100 cm soil layer and groundwater with the utilization rate in the range of 20%-25.2%.[Conclusion]P. orientalis can adjust water source and its utilization ratio according to water conditions.

Key words: Platycladus orientalis, precipitation gradient, water source, utilization strategy, hydrogen and oxygen isotopes, Beijing mountain area

中图分类号:

S715

刘自强, 余新晓, 贾国栋, 李瀚之, 路伟伟, 侯贵荣. 北京山区侧柏利用水分来源对降水的响应[J]. 林业科学, 2018, 54(7): 16-23.

Liu Ziqiang, Yu Xinxiao, Jia Guodong, Li Hanzhi, Lu Weiwei, Hou Guirong. Response to Precipitation in Water Sources for Platycladus orientalis in Beijing Mountain Area[J]. Scientia Silvae Sinicae, 2018, 54(7): 16-23.

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