干旱区生态环境知识资源中心(Arid): 科尔沁沙地景观斑块结构对沙漠化过程影响分析

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	科尔沁沙地景观斑块结构对沙漠化过程影响分析
其他题名	Analysis of landscape patch structure influence on desertification process of Kerqin Sandy Land
	常学礼 1; 鲁春霞 2; 高玉葆 1; 曹艳英 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2004
卷号	24 期号:6 页码:1237-1242
中文摘要	采用RS和GIS技术对科尔沁沙地景观斑块结构对沙漠化的影响进行了研究.通过选择固定沙丘斑块、农田斑块和景观中总斑块的数量、平均面积和平均斑块形状等九个因子,分别采用单因子关联分析和多因子PCA分析,揭示了科尔沁沙地斑块结构对沙漠化过程的影响.单因子的分析表明,固定沙地斑块数(SN)和平均斑块面积(SA)、农田斑块数(CN)和总斑块数(TN)与沙漠化程度(DG)的关联程度极为显著(在0.01水平上),关联系数＞0.921.各因子与沙漠化程度之间存在回归关系,其中上述4个因子与沙漠化程度的关系比较密切,呈线性回归关系,相关系数变化在0.902～0.991之间,相互之间有较高的置信度.PCA的分析表明,不同类型斑块数量对沙漠化景观的影响最大,其所代表的影响方向(PCI轴)占所有分析因子贡献率的53.3%;不同类型斑块形状对沙漠化景观的影响次之,其所代表的影响方向(PC2轴)占所有分析因子贡献率的27.5%.从不同斑块类型对沙漠化的影响特点来看,固定沙丘斑块对沙漠化的发生、发展起正向的影响作用,斑块的各种指数(SN、SA和SF)与沙漠化的关系都为正关联.农田斑块对沙漠化的影响作用则较复杂,其中斑块数量(CN)与沙漠化的关系为正关联,而平均斑块面积(CA)和平均形状指数(CF)与沙漠化的关系为负关联.
英文摘要	This study analyzes the effect of landscape patch structure influence upon desertification process by using RS and GIS techniques in Kerqin Sandy Land. Basic image adopt landsat TM image obtained on Sep. 6, 2000. RS and GIS software, such as erdas 8. 4, Arcview 3- 2, and Arcinfo 7.1, was used as an interpretation tools. Landscape is divided to eight types by means of land use and cover classification method. Analysis data come from samples that are same size and locate at different place on interpreted map. The factors of patch number, average patch area, and average patch shape of fixed sandy land, cropland, and total patch have been employed to judge the effect of patch structure influence upon the desertification process. Due to association and regression analysis of single factor between above mentioned factors and desertification degree CDG) which is quantitative indicator of desertification process, results showed that: (1) there were significant correlation (at 0.01 level) among the patch numbers of fixed sandy land (SN), the average area of total patch (SA) , the patch numbers of cropland (CN), the numbers of total patch (TN) and the DG. Their association coefficients were more than 0. 921. (2) There were linear regression relations between the DG and all of the factors. (3) However, there were not highest correlations between the factors and the DG only, but had highest correlations among inter-factors. These highlighted that there were complex relations among the DG and the factors that could be directly or indirectly influence upon DG. According to above findings we can confirm that the patch structure obviously affects the DG in a synthetic way, so principal component analysis (PCA) becomes a necessary method for best understanding the relation between the patch structure and the DG because it is a useful tool for analyzing multi-factors impact. The PCA results showed that all patch structure effects could be integrated to five vectors for the patch structure influence upon the DG, and total cumulative proportion was 99%. Among of these, the cumulative proportion of the first and the second vectors reached to 80. 8% and were main comprehensive factors (vectors). The numbers of different kinds of patches were the major impact factor of desertification process, and its cumulative proportion reached to 53. 3% at PCI axis. The patch shapes were the secondary impact factor of desertification process and its cumulative proportion reached to 27. 5% at PC2 axis. In terms of the characteristics of different patch types affecting on the desertification process, the fixed sandy land patches played a positive role for the DG and had a positive correlation between all indices and the DG. The cropland patches played a different role in different ways. First, it brought about a positive correlation between the patch numbers of cropland and the DG. Second, it result in a negative relationship between the average patch areas and the average patch shapes with the DG.
中文关键词	景观 ; 斑块结构 ; 沙漠化 ; 关联分析 ; PCA分析
英文关键词	landscape patch structure desertification association analysis principal component analysis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY ; ECOLOGY
WOS研究方向	Geology ; Environmental Sciences & Ecology
CSCD记录号	CSCD:1571886
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205362
作者单位	1.南开大学生命科学学院, 天津 300071, 中国; 2.中国科学院地理科学与资源研究所, 北京 100101, 中国; 3.烟台师范学院地理与旅游系, 烟台, 山东 264025, 中国
推荐引用方式 GB/T 7714	常学礼,鲁春霞,高玉葆,等. 科尔沁沙地景观斑块结构对沙漠化过程影响分析[J]. 中国科学院地理科学与资源研究所,2004,24(6):1237-1242.
APA	常学礼,鲁春霞,高玉葆,&曹艳英.(2004).科尔沁沙地景观斑块结构对沙漠化过程影响分析.生态学报,24(6),1237-1242.
MLA	常学礼,et al."科尔沁沙地景观斑块结构对沙漠化过程影响分析".生态学报 24.6(2004):1237-1242.