干旱区生态环境知识资源中心(Arid): 荒漠草原弃耕恢复草地土壤与植被的RDA分析

Arid

	荒漠草原弃耕恢复草地土壤与植被的RDA分析
其他题名	Redundancy analysis of soil and vegetation of recovered grassland on abandoned land in the desert steppe
	王兴 1; 宋乃平1 ; 杨新国 1; 陈林1 ; 刘秉儒 1; 曲文杰 1; 杨明秀 1; 肖绪培 2
来源期刊	草业学报
ISSN	1004-5759
出版年	2014
卷号	23 期号:2 页码:90-97
中文摘要	土壤质量变劣是沙化的本质, 核心内容为土壤物质流失, 理化性质和生物特性退化, 以及土体构型的变化。弃耕前土壤沙化程度和性质对弃耕地植被恢复进程、演替方向等产生重要影响。为了深入认识弃耕恢复草地不同覆沙厚度条件下,土壤环境因子和植物之间的关系,以宁夏盐池荒漠草原弃耕恢复草地为研究对象,应用冗余分析(redundancy analysis RDA),研究弃耕恢复草地随地表覆沙厚度在空间上的连续变化,植被分布及其多样性变化与主要土壤因子间的关系。结果表明,1)随着覆沙厚度的增加植被由达乌里胡枝子群落向苦豆子群落转变;达乌里胡枝子的重要值由0.334降低到0.104,苦豆子的重要值由0增加到0.404。2)植物群落物种多样性指数从0.32增加到0.79,丰富度指数从0.13增加到0.40,均匀度指数从0.11增加到0.22。3)对弃耕地植物群落分布及其物种多样性变化有显著影响的主要土壤环境因子分别为碳酸钙和全盐(0~10 cm)、碳酸钙(10~40 cm)。表层土壤碳酸钙含量的变化表征了地带性灰钙土的沙化程度和退化阶段,弃耕恢复草地当前植物分布格局的形成主要还是特定土壤退化状态约束下物种随机扩散竞争的适应性结果,覆沙厚度所决定的表层土壤环境因子的直接或间接作用是主要的决定因子,土壤养分对植被的直接作用尚未充分体现。
英文摘要	The essence of desertification is that soil quality deteriorates. Loss of soil materials, soil physical and chemical properties, deterioration of biological characteristics and the changing of soil structure are the principal features. The previous degrees and nature of soil desertification have important effects on the process of vegetation recovery and the direction of succession after land is abandoned. To develop a deeper understanding of the relationship between plant and soil environmental factors under different thicknesses of sand bed, we studied the relationship between plant distribution, diversity and major soil factors with the changing of surface sand bed thickness in space by redundancy analysis, taking a recovered grassland on abandoned cultivated land in the desert steppe region of Ningxia as the test area. With an increase of sand bed thickness, the Lespedeza bicolor plant community was substituted by that of Sophora alopecuroides, and the importance of L. bicolor decreased from 0.334 to 0.104 while the importance value of S. alopecuroides increased from 0 to 0.404. The plant diversity index of Margalef, Shannon-Wiener and Pielou were correspondingly increased: the plant diversity index of Margalef increased from 0.32 to 0.79, that of Shannon-Wiener from 0.13 to 0.40,and that of Pielou from 0.11 to 0.22. The main significant soil environment factors affecting plant distribution and diversity were soil salt and calcium carbonate in the 0-10 cm soil layer and soil calcium carbonate in the 10-40 cm soil layer. The change of soil calcium carbonate content on the surface represented the degree of desertification and the stage of degeneration of the zonal sierozem. At present, the form of plant distribution patterns on recovered grassland in abandoned lands, was mainly the result of adaptability of species diffusing and randomly competing under the given constraints of a specific state of soil degradation. The crucial factors were the direct or indirect effects of surface soil environmental factors decided by sand bed thickness, although the direct action of soil nutrients for vegetation were not fully reflected.
中文关键词	荒漠草原 ; 弃耕恢复草地 ; 覆沙厚度 ; 冗余分析
英文关键词	desert steppe recovered grassland on abandoned land sand bed thickness redundancy analysis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5115626
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230869
作者单位	1.宁夏大学, 西北土地退化与生态恢复国家重点实验室培育基地, 银川, 宁夏 750021, 中国; 2.宁夏大学资源环境学院, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	王兴,宋乃平,杨新国,等. 荒漠草原弃耕恢复草地土壤与植被的RDA分析[J]. 宁夏大学,2014,23(2):90-97.
APA	王兴.,宋乃平.,杨新国.,陈林.,刘秉儒.,...&肖绪培.(2014).荒漠草原弃耕恢复草地土壤与植被的RDA分析.草业学报,23(2),90-97.
MLA	王兴,et al."荒漠草原弃耕恢复草地土壤与植被的RDA分析".草业学报 23.2(2014):90-97.