自然保护区建设是保护生态系统服务的重要手段,在防治土壤侵蚀和维持生态安全方面具有不可替代的作用。以1988年、1998年和2008年3期遥感影像为基础,分析海南保护区对土壤保持功能的长期保护效果,探讨引起保护区土壤保持功能变化的影响...自然保护区建设是保护生态系统服务的重要手段,在防治土壤侵蚀和维持生态安全方面具有不可替代的作用。以1988年、1998年和2008年3期遥感影像为基础,分析海南保护区对土壤保持功能的长期保护效果,探讨引起保护区土壤保持功能变化的影响因素。结果表明:(1)海南岛保护区内部平均单位面积土壤保持量是1951.59 t hm-2a-1,分别是区外0—5、5—10km和海南岛全省平均水平的2.4、3.2、2.9倍,保护区在土壤保持功能的保育方面发挥着重要作用;(2)在时间尺度上,1988—2008年保护区内外土壤保持功能呈现不同程度的退化趋势,其中保护区外围退化程度显著高于保护区内部(P<0.05),后10年的退化程度显著高于前10年(P<0.05);(3)从驱动因素上看,1988—2008年经济发展、人口增加和耕地扩张是影响保护区土壤保持功能退化的主要因素,其中在前10年,土壤保持功能与单位面积地区生产总值、单位面积第一产业生产总值、人口密度和耕地比例呈显著负相关(P<0.05),而在后10年,土壤保持功能与单位面积地区生产总值、人口密度和耕地比例呈显著负相关(P<0.05),由此,应权衡土壤保持功能保护与人为活动的关系,实现生态环境保护与社会经济的协调发展。展开更多
Combining the integrated technology of ecological quantity analytical method with GIS technology, based on the Landsat TM images and SPOT images in 1995 and 2009, this paper made a quantitative analysis of the changin...Combining the integrated technology of ecological quantity analytical method with GIS technology, based on the Landsat TM images and SPOT images in 1995 and 2009, this paper made a quantitative analysis of the changing process of land use/cover. The results showed that land use/cover in study area had undergone obviously changes from 1995 to 2009. The artificial landscapes which were mainly tropical crops plantation increased dramatically, natural forest and rubber forest was substantially reduced. The major patterns of land use change in the study area were the conversions of the natural forest and rubber forest to tropical crops plantation and cultivated land, cultivated land converted to tropical crops plantation and residential area. The analysis of landscape index showed that the role of landscape structure more diverse and uniform with the diversity of landscape fragmentation increases, the dominance of natural forest and rubber forest on the overall control of landscape reduced under the influence of human activities in the study area. The driving force analysis showed that economic development, agriculture industrial structure, policy and technology factors were the dominant factors of land use/change in the study area in the short term.展开更多
文摘自然保护区建设是保护生态系统服务的重要手段,在防治土壤侵蚀和维持生态安全方面具有不可替代的作用。以1988年、1998年和2008年3期遥感影像为基础,分析海南保护区对土壤保持功能的长期保护效果,探讨引起保护区土壤保持功能变化的影响因素。结果表明:(1)海南岛保护区内部平均单位面积土壤保持量是1951.59 t hm-2a-1,分别是区外0—5、5—10km和海南岛全省平均水平的2.4、3.2、2.9倍,保护区在土壤保持功能的保育方面发挥着重要作用;(2)在时间尺度上,1988—2008年保护区内外土壤保持功能呈现不同程度的退化趋势,其中保护区外围退化程度显著高于保护区内部(P<0.05),后10年的退化程度显著高于前10年(P<0.05);(3)从驱动因素上看,1988—2008年经济发展、人口增加和耕地扩张是影响保护区土壤保持功能退化的主要因素,其中在前10年,土壤保持功能与单位面积地区生产总值、单位面积第一产业生产总值、人口密度和耕地比例呈显著负相关(P<0.05),而在后10年,土壤保持功能与单位面积地区生产总值、人口密度和耕地比例呈显著负相关(P<0.05),由此,应权衡土壤保持功能保护与人为活动的关系,实现生态环境保护与社会经济的协调发展。
基金Supported by National Natural Science Foundation (40963001,40661013,40061003)~~
文摘Combining the integrated technology of ecological quantity analytical method with GIS technology, based on the Landsat TM images and SPOT images in 1995 and 2009, this paper made a quantitative analysis of the changing process of land use/cover. The results showed that land use/cover in study area had undergone obviously changes from 1995 to 2009. The artificial landscapes which were mainly tropical crops plantation increased dramatically, natural forest and rubber forest was substantially reduced. The major patterns of land use change in the study area were the conversions of the natural forest and rubber forest to tropical crops plantation and cultivated land, cultivated land converted to tropical crops plantation and residential area. The analysis of landscape index showed that the role of landscape structure more diverse and uniform with the diversity of landscape fragmentation increases, the dominance of natural forest and rubber forest on the overall control of landscape reduced under the influence of human activities in the study area. The driving force analysis showed that economic development, agriculture industrial structure, policy and technology factors were the dominant factors of land use/change in the study area in the short term.
