贵州荔波喀斯特与非喀斯特地区土壤水运移的对比研究
Comparative Research on Soil Water Movement Between Karst and Non-karst Plots in Libo County of Guizhou Province,China
查看参考文献46篇
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文摘
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以我国西南地区典型的喀斯特与非喀斯特样地为研究对象,采集大气降水和土壤水,根据其δD值、δ18O值和水量特征探讨土面生境非植物主根区土壤水的运移特征。结果表明:喀斯特样地土壤基质流的混合作用较弱,非喀斯特样地表层(0~20 cm)土壤基质流的混合作用也较弱,但随深度增加基质流的混合作用增强;喀斯特与非喀斯特样地土壤基质流都可能存在活塞流运移机制,尤其是喀斯特样地,活塞流很可能是基质流的一种重要运移机制;喀斯特样地土壤介质中存在优先流,优先流空间异质性较大;蒸发作用对非喀斯特样地表层土壤基质孔隙水影响较大,而对喀斯特样地土壤水的影响较小。这为喀斯特区水资源的管理和合理利用,以及区域植物水分利用和营养元素循环利用等研究奠定基础。 |
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其他语种文摘
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In Libo County of Guizhou Province,a karst plot (K)and a non-karst plot (NK)with similar forest covers located in the peak-cluster region,representative of a widely spreading landform in Southwest China,were chosen to study comparatively the soil water movement characteristics in the non-main root zone of the earth flatland,which is the most important micro-habitat with soil cover in the study plots.From May 2008 to July 2009,rainfall samples as well as two kinds of soil water samples were collected.These water samples were measured forδ18O andδD.Based on the comparison of isotopic compositions together with water amount characteristics between rainfall and soil water as well as the relationships betweenδ18O andδD for these water samples,several conclusions could be drawn out.The mixing effect of soil water base flow (SWBF)for K is weak,whereas for NK it is relatively strong except for the uppermost 20-centimeter soil layer.Piston flow (PF)is probably an important percolation mechanism for SWBF in K,while in NK SWBF might percolate downward partly as PF.In K,there are some evidence for the existence of preferential flow with a high degree of heterogeneity.In general,the evaporation effect on soil water is relatively weak except for the uppermost 10-centimeter soil pore water in NK.These conclusions have implications not only for water management and utilization strategies,but also for further study of water and nutrients used by plants in karst areas. |
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来源
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地球与环境
,2011,39(2):137-149 【核心库】
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关键词
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土壤水
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δ18O
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δD
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活塞流
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优先流
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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国家自然科学基金
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国家973计划
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国家自然科学基金项目
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文献收藏号
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CSCD:4241472
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