引用本文:刘方,王世杰,罗海波,刘元生,刘鸿雁.喀斯特森林生态系统的小生境及其土壤异质性[J].土壤学报,2008,45(6):1055-1062. DOI:trxb10.11766/200705170607
Liu Fang,Wang Shijie,Luo Haibo,Liu Yuansheng,Liu Hongyan.MICRO-HABITATS IN KARST FOREST ECOSYSTEM AND VARIABILITY OF SOILS[J].Acta Pedologica Sinica,2008,45(6):1055-1062. DOI:trxb10.11766/200705170607
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喀斯特森林生态系统的小生境及其土壤异质性
刘方1,2, 王世杰2, 罗海波1, 刘元生1, 刘鸿雁3
1.贵州大学环境与资源研究所, 贵阳 550025;2.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;3.教育部喀斯特环境与地质灾害防治重点实验室, 贵阳 550003
摘要:
通过对贵州南部茂兰喀斯特森林生态系统中小生境的土壤进行调查及采样分析,探讨喀斯特微地貌的土壤多样性及土壤性质的变化.结果表明:在小生境地表微形态和微地貌空间变异的影响下,石坑、石沟、石缝、石洞和土面的土壤分布及其性质出现明显的水平空间变异.石洞土壤砂粒含量、>5mm团聚体数量、容重明显高于石坑、石沟、石缝和土面的土壤,而<1mm团聚体数量、通气孔隙度及腐殖酸、全氮、全磷、有效氮的含量则相反;石坑土壤<1mm团聚体数量、通气孔隙度及有机碳、腐殖酸、全氮、有效磷、有效钾、有效铜、有效锌的含量显著高于石洞、石沟、石缝和土面的土壤,而黏粒含量、>5mm团聚体数量、容重则明显低于土面、石沟和石缝的土壤;石沟土壤的黏粒含量显著低于土面和石缝的土壤,而<1mm团聚体数量及有机碳、腐殖酸、全氮的含量则相反;石缝土壤有机碳、有效钾的含量明显低于土面、石沟的土壤.初步将喀斯特微地貌的土壤类型分为石洞型、石缝型、土面-石沟型和石坑型,其中土面-石沟型土壤分布最多,其次为石缝型.
关键词:  喀斯特  森林生态系统  小生境  土壤性质  异质性
基金项目:国家重点基础研究发展规划项目(2006CB403200);中国科学院知识创新工程方向性项目(kzcx2-yw-306);创新团队国际合作伙伴计划共同资助
MICRO-HABITATS IN KARST FOREST ECOSYSTEM AND VARIABILITY OF SOILS
Liu Fang1,2, Wang Shijie2, Luo Haibo1, Liu Yuansheng1, Liu Hongyan3
1.Institute of Environment and Resource, Guizhou University, Guiyang 550025, China;2.State Key Laboratory of Environmental Geochemistry, Geochemistry Institute of Chinese Academy of Sciences, Guiyang 550002, China;3.The Key Laboratory of Karst Environment and Geological Disaster Prevention of Education Ministry, Guiyang 550003, China
Abstract:
Diversity of the soils and variability of the soil properties of karst microrelieves were exp lored through survey and sampling analysis of the soils in micro-habitats of the karst forest ecosystem of Maolan,South Guizhou.Results show that soil distribution and soil properties varied sharp ly spatially with the micro-habitats,like pit,gully,crevice,cavern and flat land.Cavern was obviously higher than pit,gully,crevice and flat land in sand content,> 5 mm aggregate content and bulk density of the soil,but lower in < 1 mm aggregate content,aeration porosity,humic acid,total nitrogen,total phosphorus and available N;Pit was higher than the others in < 1 mm aggregate content,aeration porosity,organic carbon,humic acid,total nitrogen,available P,available K,available Cu and Zn,but lower in clay content,> 5 mm aggregate content,and bulk density than earthy flat land,gully,and crevice.Gully was markedly lower than flatland and crevice in clay content,but higher in 1 mm aggregate content,organic carbon,humic acid and total N.Crevice was obviously lower than earthy flatland,and gully in organic carbon and available K.Therefore,the soils in microrelieves of the karst region can primarily be divided into four types,i.e.cavern soil,crevice soil,earthy-flatland-gully soil,and pitsoil,of which flatland-gully soil is most extensively distributed and followed by crevice soil.
Key words:  Karst  Forest ecosystem  Micro-habitats  Soil properties  Variability