科尔沁沙地流动沙丘斑块动态与沙漠化关系  被引量:9

Relationship between desertification and patches dynamics of mobile-dune in Kerqin sandy land

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作  者:常学礼[1] 鲁春霞[2] 高玉葆[1] 毛爱华[3] 

机构地区:[1]南开大学生命科学院,天津300071 [2]中国科学院地理与自然资源科学研究所,北京100101 [3]烟台师范学院地理与旅游系,山东烟台264025

出  处:《自然灾害学报》2003年第3期54-60,共7页Journal of Natural Disasters

基  金:国家重点基础研究发展规划项目(G2000018607);中科院寒旱所创新项目(CX210066)资助

摘  要:通过对科尔沁沙地沙漠化程度与流动沙丘斑块属性的ANOVA分析和关联分析,研究结果表明,流动沙丘斑块变化极大地影响着沙地景观的结构、功能和过程,是造成沙地景观动态变化的最主要原因。在所划分的4个级别中,小斑块和中斑块的斑块数量波动较大,平均值分别为(22.8±8.98)个和(23.2±5.98)个;而大斑块和巨斑块的数量较稳定,分别为(16.7±2.42)和(4.0±1.79)个。相反,小斑块和中斑块的累积面积波动较小,而大斑块和巨斑块的累积面积变化较大。ANOVA和关联分析的结果表明,沙漠化程度与流动沙丘斑块面积的变化为正关联,而斑数量与沙漠化程度为负关联,说明在科尔沁沙地流动沙丘斑块数量增加,有利于沙漠化程度的降低。同时斑块分维数的分析结果还表明,近40年来该地区流动沙丘斑块分维数的变化呈逐渐增大的趋势,说明该地区流沙斑块的空间格局趋向复杂。而复杂的格局导致沙漠化程度的降低。从不同级别斑块分维数的变化来看,小斑块的分维数为1.098±0.054,大斑块的为1.274±0.044,变化趋势为随斑块面积的增大,分维数增大,且稳定性也增强。Through the ANOVA and correlative analysis, the relationship between desertification degree and patches attributes of mobile-dune in Kerqin sandy land was analyzed. The results indicated that the patches change of shift- ing-dune significantly influences the structure, function and processes of landscape in Kerqin sandy land and which is the main causes of landscape dynamic change of sandy land. The patches were divided into four levels including huge patches, large patches, middle patches and small patches. Among four levels, small and middle patches numbers of mobile dune changed greatly and their mean numbers reached to 22. 8±8. 98 and 23. 2±5. 98 respectively. The huge and large patches numbers fluctuated in the range of 4. 0±1. 79 and 16. 7±2. 42. In op- position to patches numbers change, the accumulated area of shifting-dune patches had a different trend. The accu- mulated area of small and middle patches changed smoothly and that of the huge and large patches altered greatly. The analysis also showed that there are a positive correlation between desertification and accumulated area change of mobile-dune patches and a negative correlation between desertification and patches numbers of shifting-dune, these suggested that the increase of patches numbers of mobile dune will benefit decreasing desertification degree. In past 40 years, the fractal dimension increased gradually which imply that the landscape pattern of mobile dune in this re- gion had trend to complication, thereby, the complicated pattern decreased desertification degree. According to dif- ferent patches grade, the fractal dimension of small patches was 1. 098±0. 054, large patches was 1. 274±0. 044, obviously, the fractal dimension of mobile dune and the stableness of landscape increased with the increase of pat- ches area.

关 键 词:科尔沁沙地 斑块动态 沙漠化 ANOVA分析 关联分析 沙丘 

分 类 号:S156.5[农业科学—土壤学]

 

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