喀斯特峰丛洼地小流域表层土壤微量元素的空间异质性

生态学杂志

喀斯特峰丛洼地小流域表层土壤微量元素的空间异质性

高鹏^1,2,3,付同刚^1,2,3,王克林^1,2**,陈洪松^1,2,曾馥平^1,2

(¹中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室，长沙 410125; ^2中国科学院环江喀斯特生态系统观测研究站，广西环江 547100; ^3中国科学院大学，北京 100049)

出版日期:2013-08-10 发布日期:2013-08-10

Spatial heterogeneity of surface soil trace elements in a small catchment in Karst peak-cluster depression area of South China.

GAO Peng^1,2,3, FU Tong-gang^1,2,3, WANG Ke-lin^1,2**, CHEN Hong-song^1,2, ZENG Fu-ping^1,2

(¹Key Laboratory of Agroecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; ^2Huanjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences, Guangxi Zhuang Autonomous Region, Huanjiang 547100, Guangxi, China; ³University of Chinese Academy of Sciences, Beijing 100049, China)

Online:2013-08-10 Published:2013-08-10

摘要/Abstract

摘要： 基于网格取样(80 mx80 m)，利用经典统计学和地统计方法分析了典型喀斯特峰丛洼地小流域163个表层(0～20 cm)土壤样点微量元素(Pb、Cr、Ni、Cu、Zn、B)的空间变异特征。结果表明：研究区土壤6种微量元素含量的差异及变异系数均较大，平均含量大小顺序为Zn>Cr>Ni>Pb>B>Cu，平均变异程度依次为Ni>Cu>Zn>Pb>B>Cr。不同微量元素具有不同的空间结构和最佳拟合模型，除Cr呈中等程度自相关、变程较长、空间连续性较好外，其他5种元素均呈强烈自相关，变程较短，空间依赖性较强。6种微量元素的Kriging等值线图较为相似，表明研究区土壤微量元素含量有着相似的分布趋势，表现为东部高，南北两头低，洼地高，坡地低。人为干扰和自然条件(植被、裸岩率、坡度、坡向)是土壤微量元素空间异质性的主要影响因素。

关键词: 生态位, 生态位分化, 鱼类, 种间联结

Abstract: Based on grid (80 mx80 m) sampling and by using the methods of classical statistics and geostatistics, an investigation was conducted on the spatial heterogeneity of trace elements (Pb, Cr, Ni, Cu, Zn, and B) in 163 surface soil (0-20 cm) samples in a small catchment in a typical Karst cluster-peak depression area of South China. There was a great difference in the concentrations of the soil trace elements. Their average concentrations were in the order of Zn>Cr>Ni>Pb>B>Cu, and the average variation coefficients were in the sequence of Ni>Cu>Zn>Pb>B>Cr. Except that the Cr had a medium spatial autocorrelation with longer range and a better spatial continuum, the other five trace elements had a stronger spatial autocorrelation with shorter range and a stronger spatial dependence. The similar Kriging contour maps indicated that the distribution patterns of the six trace elements were almost similar, i.e., higher in the east and lower in the north and south, and higher in depression and lower on slope. It was suggested that human disturbances and natural conditions (vegetation, bare rock rate, slope, and aspect) were the primary factors affecting the spatial patterns of the soil trace elements in small catchments in Karst peak-cluster depression regions.

Key words: niche, niche differentiation, interspecific association, fish.

高鹏1,2,3,付同刚1,2,3,王克林1,2**,陈洪松1,2,曾馥平1,2. 喀斯特峰丛洼地小流域表层土壤微量元素的空间异质性[J]. 生态学杂志.

GAO Peng1,2,3, FU Tong-gang1,2,3, WANG Ke-lin1,2**, CHEN Hong-song1,2, ZENG Fu-ping1,2. Spatial heterogeneity of surface soil trace elements in a small catchment in Karst peak-cluster depression area of South China.[J]. cje.

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