干旱区生态环境知识资源中心(Arid): 华北山区油松侧柏降雨前后水分来源

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	华北山区油松侧柏降雨前后水分来源
其他题名	Water sources of Pinus tabuliformis and Platycladus orientalis before and after rain in northern China
	刘自强; 余新晓; 邓文平; 贾国栋; 贾剑波; 娄源海; 李瀚之
来源期刊	中国水土保持科学
ISSN	1672-3007
出版年	2016
卷号	14 期号:2 页码:111-119
中文摘要	北京山区处于季节性干旱的生态脆弱地带,研究其典型树种在降雨前后的水分来源对干旱区水分利用具有重要意义。本研究基于氢氧同位素技术,以北京山区典型乔木树种油松和侧柏为研究对象,测定分析树木枝条、土壤、地下水和降雨等氢氧同位素组成,探明2种乔木树种在降雨前后主要水分来源。结果表明:不同树种在同一时期的水分来源不同,同一树种在降雨前后水分来源不同。油松表层根系分布虽少,但在雨前仍能吸收利用含水量较高的表层土壤水,利用率为36.0%;为获得稳定水源,油松在降雨前后都利用发达的主根系吸收利用地下深层水分,利用率分别为38.0%和58.2%。侧柏在雨前干旱缺水时能利用深层水维持正常生理活动,利用率为71.2%,但分布在土壤表层0~20 cm的侧根系对降雨反应较为敏感,雨后的侧柏主要利用表层土壤水分,利用率为71.6%。试验结果将对于干旱半干旱地区人工造林、树种配置和缓解水资源短缺具有重要意义。
英文摘要	[Background] Mountains in Beijing are in an ecologically fragile area with seasonal drought; therefore, study of water source of typical tree species before and after the rain in arid areas is of great significance. [Methods] By taking Pinus tabulaeformis and Platycladus orientalis in mountains in Beijing as subject, we employed the hydrogen and oxygen isotope technique and measured the isotopic composition in branches of trees, soil, groundwater and rainfall in order to clarify their water source before and after the rain. [Results] The results showed that the soil moisture content and the isotope of the two species showed a vertical change. P. tabuliformis and P. orientalis forest soil were different in soil moisture content before rainfall. Soil moisture content in Platycladus orientalis layers was lower than that in Pinus tabulaeformis. The average soil moisture content was 7.44% and 2.17%, respectively. After the rainfall, soil moisture content in the stands of two typical species were higher than before, the average soil moisture content in the P. orientalis stand increased by 46.1% compared to that before rainfall, while it increased by 38.7% for P. tabuliformis. The intense evaporation of surface soil water caused the isotope fractionation and enrichment heavy isotopes. Decreasing with soil depth, soil water deltaD in P. tabuliformis and P. orientalis stands showed a tendency to increase, and the heavy isotope was enriched. Different plant species had different water sources in the same season, and the same plant species had different water sources before and after the rain, showing an adaptation to their habitats. P. tabuliformis had fewer roots in surface soil, but still absorbed a high amount of topsoil water before rainfall, with a utilization rate of 36.0%; in order to obtain a stable water supply, P. tabuliformis used the developed deep roots to absorb underground water with a utilization rate of 38% and 58.2%, before and after rain, respectively. P. orientalis used deep soil water to maintain normal physiological activities, and the utilization rate was 71.2%. The lateral root in the surface layer soil of 0-20 cm was sensitive to rainfall, and P. orientalis mainly used surface soil moisture with a utilization rate of 71.6%. [Conclusions] Our results have great significance for artificial afforestation, tree species configuration and alleviation of the water resource shortage in arid and semi-arid areas.
中文关键词	油松 ; 侧柏 ; 季节性干旱 ; 水分来源 ; 稳定氢氧同位素 ; 华北
英文关键词	pinus tabuliformis platycladus orientalis seasonal drought water source stable hydrogen and oxygen isotopes northern China
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Agriculture
WOS研究方向	Agriculture
CSCD记录号	CSCD:5703613
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235497
作者单位	刘自强, 北京林业大学水土保持学院, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国.; 余新晓, 北京林业大学水土保持学院, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国.; 邓文平, 北京林业大学水土保持学院, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国.; 贾国栋, 北京林业大学水土保持学院, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国.; 贾剑波, 北京林业大学水土保持学院, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国.; 娄源海, 北京林业大学水土保持学院, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国.; 李瀚之, 北京林业大学水土保持学院, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国.
推荐引用方式 GB/T 7714	刘自强,余新晓,邓文平,等. 华北山区油松侧柏降雨前后水分来源[J]. 北京林业大学,2016,14(2):111-119.
APA	刘自强.,余新晓.,邓文平.,贾国栋.,贾剑波.,...&李瀚之.(2016).华北山区油松侧柏降雨前后水分来源.中国水土保持科学,14(2),111-119.
MLA	刘自强,et al."华北山区油松侧柏降雨前后水分来源".中国水土保持科学 14.2(2016):111-119.