干旱区生态环境知识资源中心(Arid): 桂西北喀斯特洼地土壤有机碳和速效磷的空间变异

Arid

	桂西北喀斯特洼地土壤有机碳和速效磷的空间变异
其他题名	Spatial variability of soil organic carbon and available phosphorus in a typical Karst depression, northwest of Guangxi
	张伟 1; 陈洪松 1; 王克林 1; 侯娅 1; 张继光 2
ISSN	1000-0933
出版年	2007
卷号	27 期号:12 页码:5168-5175
中文摘要	空间变异性的研究有助于认识土壤养分的空间分布特征与生态过程之间的关系。采用网格取样（20m*20m），利用地统计学方法分析了典型喀斯特洼地土壤有机碳（SOC）和速效磷（AP）的空间变异特征。结果表明SOC和AP的半变异函数分别用球状模型和指数模型拟合的效果较好。块金效应对SOC和AP总变异的贡献分别为37．9％和49．8％，说明SOC主要受结构性因素控制，而AP受结构性因素和随机因素双重控制。SOC的分布呈明显的带状各向异性特征，在洼地的长轴方向具有较大的变程和较小的基台值，其全向半变异函数的相关距离为135．5m，与洼地不同种植类型地块的覆盖尺度基本相当。AP的分布特征与SOC存在明显差异，具有较大的漂移趋势，其相关距离为413．4m；但在分离漂移趋势后，其相关距离为167．4m，反映了不同地块间的施肥差异对AP的影响较大。喀斯特洼地SOC的空间分布主要受地形和土地利用结构控制，而AP的分布的规律性不明显，可能与施肥等因素的随机性较强有关。
英文摘要	Disturbance of ecosystem is ubiquitous in the world,which would primarily affect plant communities.The variations of plant vegetation and spatial distribution were investigated in the areas of four typical disturbances,which had been under natural restoration for 22 years in the karst area in the northwest of Guangxi while the climax plant community was utilized as control.The slope scale and disturbance theory was used to study plant diversity in whole area and selected plots.It is clear that the disturbances had resulted in severe loss of plant species,only 241 species of vascular plant that belong to 91 families and 206 genera survived in the disturbed areas,it was only 26.6% of that in natural conservation area.The consequent succession of plant vegetation types were sparse grass of rocky desertification,grass,shrub,liana-shrub,deciduous broad-leaved forest,and mixed segment of evergreen and deciduous broad-leaved forest.The height,coverage,biomass and species diversity of plants decreased sharply with slope elevating and the plant density appeared with normal distribution.Compared with the natural conservation area all criteria of plant vegetation in disturbed areas were much worse.Furthermore,different types of disturbances showed various affections on natural vegetative restoration,among them,tillage after whole slope burned caused the worst impact where rocky desertification was the consequence,followed by depasturing after whole slope burned.While cutting was selective disturbance,the vegetative restoration in the area with combination of cutting,depasturing and slope foot burning was relatively fast,however,it was even better in the area with combination of cutting and slope foot burning.Based on our studies,four strategies for vegetative recovery considering both natural and artificial approaches were established,which were suitable for the karst area in the northwest of Guangxi.
中文关键词	喀斯特洼地 ; 土壤养分 ; 空间变异 ; 地统计学
英文关键词	Karst depression soil nutrients spatial variability geostatistics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3046120
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/221365
作者单位	1.中国科学院亚热带农业生态研究所, 长沙, 湖南 410125, 中国; 2.中国科学院南京土壤研究所, 南京, 江苏 210008, 中国
推荐引用方式 GB/T 7714	张伟,陈洪松,王克林,等. 桂西北喀斯特洼地土壤有机碳和速效磷的空间变异[J],2007,27(12):5168-5175.
APA	张伟,陈洪松,王克林,侯娅,&张继光.(2007).桂西北喀斯特洼地土壤有机碳和速效磷的空间变异.,27(12),5168-5175.
MLA	张伟,et al."桂西北喀斯特洼地土壤有机碳和速效磷的空间变异".27.12(2007):5168-5175.