Soil water use patterns of typical tree species in Beijing mountainous area

被引：0
作者：
Jia, Guodong [1 ]
Yu, Xinxiao [1 ]
Deng, Wenping [1 ]
Fan, Dengxing [1 ]
机构：
[1] Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2013年 / 21卷 / 03期
关键词：
Hydrogen and oxygen isotopes; Platycladus orientalis; Quercus variabilis; Root distribution; Water source;
D O I：
10.3969/j.issn.1005-0930.2013.03.002
中图分类号：
学科分类号：
摘要：
Beijing mountainous area locates in the drought-prone and ecologically-fragile zone of China. To understand how the typical tree species survive under the limited water conditions is of great importance. In this study, to understand soil water use patterns of typical tree species in Beijing mountainous area, suberized plant stems and soil samples of Platycladus orientalis and Quercus variabilis ecosystems were collected for isotopic analysis. The results showed that the average litter thickness for P. orientalis and Q. variabilis was 4.0 and 8.5cm, respectively, and the litter reserve was 3.67 and 10.82t/hm2, respectively. Roots of P. orientalis mainly distributed in the upper soil layer, while the roots of Q. variabilis mainly distributed in the deeper soil layer. Both soil δD and δ18O values of 0-30cm were higher in the dry season than that in the wet season, while the soil δD and δ18O values of 30-70cm remain relatively stable. By two-compartment linear mixing model, the results showed that over 60 percent of the water was derived from the deep soil layer by Q. variabilis, while P. orientalis mainly depended on the upper soil layer. However, both these two tree species obtained more than 10% of water from the shallow soil depth in the dry season than that in the wet season and the root distribution was one of key factors that affected water sources for tree species. The results will provide scientific support and theoretical basis for future ecological construction in Beijing mountainous area.
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页码：403 / 411
页数：8
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