本研究在2022年广西山口国家级红树林生态自然保护区(以下简称山口红树林保护区)实地调查数据的基础上,选取1987—2021年期间6个时相的遥感影像,利用面向对象的图像分类方法,解析土地利用/土地覆盖变化(land-use and land-cover change,...本研究在2022年广西山口国家级红树林生态自然保护区(以下简称山口红树林保护区)实地调查数据的基础上,选取1987—2021年期间6个时相的遥感影像,利用面向对象的图像分类方法,解析土地利用/土地覆盖变化(land-use and land-cover change,LUCC)状况,并基于LUCC计算景观格局指数(landscapepatternindex,LPI),结合LUCC着重探索广西山口红树林保护区湿地变化过程及其重要影响因素。结果表明:从土地利用角度来看,研究区近35年间地类之间不断转换,其中耕地面积持续减少,米草滩和养殖坑塘大比例增长,米草滩主要侵占原沿海滩涂,养殖坑塘主要由林地和耕地转换而来;就景观角度来看:景观破碎度持续增加,连通性逐渐降低,景观形状逐渐变得复杂,地类演替变得频繁;Pearson相关性分析表明,沿海滩涂、米草滩和养殖坑塘的土地利用变化与景观指数之间存在极显著或显著的相关性。在过去35年中,山口红树林保护区经历了重大的土地利用变化,入侵物种(米草滩)和人为干扰(养殖坑塘)是影响该地区红树林湿地变化的主要因素,也是景观破碎度持续增加的主要成因;研究揭示了区域景观变化的影响因素,对典型红树林生态系统的环境管理和保护工作提供理论依据。展开更多
The rocky desert in a karst area directly causes the lack of soil, water and forest, hence leading to the poverty there. In 1990, the villagers from the Muzhe Village in Benggu Township, Xichou County, Yunnan declared...The rocky desert in a karst area directly causes the lack of soil, water and forest, hence leading to the poverty there. In 1990, the villagers from the Muzhe Village in Benggu Township, Xichou County, Yunnan declared a war against rocky desert in an attempt to ask the fields for more yields. They invented a distinctive land rehabilitation and sustainable use pattern called “transforming heavenand earth” that had been practiced in Southwest China’s karst areas. The key mechanism of the pattern was to develop terraced fields with well conserved soil, water and fertility by exploding rocks in the fields, building stone walls, gathering more soil, and improving soil quality and productivity for the fields in combination with building of irrigation facilities and roads, as well as with forestation and agriculture structure adjustment. The purpose of the pattern was to alleviate poverty in the karst areas by improving soil productivity and promoting agriculturaldevelopment. A typical area was studied with the help of Participatory Rural Appraisal (PRA) and the pattern was carried out there for fifteen years, have produced excellent ecological benefits and good economic benefits. Its application in the area approved that it was a sustainable land use pattern for rocky desert areas.展开更多
The quantitative evaluation on land use /cover change as well as its influence on landscape pattern under the background of returning grain plots to forestry is significant to the sustainable utilization of land resou...The quantitative evaluation on land use /cover change as well as its influence on landscape pattern under the background of returning grain plots to forestry is significant to the sustainable utilization of land resources and ecological environment reconstruction in the southern Ningxia.Based on multi-temporal remote sensing data from four periods of Landsat TM /ETM,and combination of ecological quantity analytical method with GIS,the change of land use /cover and landscape pattern in Pengyang County of Ningxia Province were analyzed.The conclusions showed that the amount of each land use type was changed with different degrees,the area of forest /grass land increased,while farmland and unused land decreased.The change of landscape pattern was characterized as that the degree of landscape fragmentation,mixed distribution of patches,diversity index and evenness index increased gradually and then decreased,the connectivity between patches decreased gradually and then increased,and landscape shape presented irregular.展开更多
城市用地空间扩张对生态环境的影响映射出人类社会活动和生态环境保护之间的交互作用,系统地研究城市空间无序蔓延所诱发的城市土地利用方式变化对城市生态环境的影响程度,对助推中国生态文明建设目标具有重要现实意义。为探究合肥市城...城市用地空间扩张对生态环境的影响映射出人类社会活动和生态环境保护之间的交互作用,系统地研究城市空间无序蔓延所诱发的城市土地利用方式变化对城市生态环境的影响程度,对助推中国生态文明建设目标具有重要现实意义。为探究合肥市城市扩张对生态安全格局的影响程度,综合运用生态遥感指数、最小累积阻力模型、电路理论和斑块生成土地利用模拟模型,构建合肥市生态安全格局,识别生态夹点和生态障碍点,再从模拟验证的基础上(总体精度为94.71%,Kappa系数为90.04%,Fom值为0.102),预测了2030—2040年的城市扩张,并根据预测结果探讨城市扩张对区域生态安全格局影响程度。研究发现:合肥市生态环境质量整体呈现南高中低的分布格局,识别出合肥市生态源地共计35处,源地间活跃生态廊道70条,非活跃廊道共17条,生态夹点290个,生态障碍点112个。2020—2040年合肥市城乡、工矿居民用地、林地、水域和未利用土地面积将不断增加,而耕地以及草地面积将持续减少。2020—2040年期间城镇建成区分别侵占了生态廊道、源地、夹点、障碍点面积为55.95、10.51、1.04、1.35 km 2。研究结果可为今后快速发展城市的生态环境治理和国土空间生态保护修复工作提供理论依据和技术参考。展开更多
文摘本研究在2022年广西山口国家级红树林生态自然保护区(以下简称山口红树林保护区)实地调查数据的基础上,选取1987—2021年期间6个时相的遥感影像,利用面向对象的图像分类方法,解析土地利用/土地覆盖变化(land-use and land-cover change,LUCC)状况,并基于LUCC计算景观格局指数(landscapepatternindex,LPI),结合LUCC着重探索广西山口红树林保护区湿地变化过程及其重要影响因素。结果表明:从土地利用角度来看,研究区近35年间地类之间不断转换,其中耕地面积持续减少,米草滩和养殖坑塘大比例增长,米草滩主要侵占原沿海滩涂,养殖坑塘主要由林地和耕地转换而来;就景观角度来看:景观破碎度持续增加,连通性逐渐降低,景观形状逐渐变得复杂,地类演替变得频繁;Pearson相关性分析表明,沿海滩涂、米草滩和养殖坑塘的土地利用变化与景观指数之间存在极显著或显著的相关性。在过去35年中,山口红树林保护区经历了重大的土地利用变化,入侵物种(米草滩)和人为干扰(养殖坑塘)是影响该地区红树林湿地变化的主要因素,也是景观破碎度持续增加的主要成因;研究揭示了区域景观变化的影响因素,对典型红树林生态系统的环境管理和保护工作提供理论依据。
文摘The rocky desert in a karst area directly causes the lack of soil, water and forest, hence leading to the poverty there. In 1990, the villagers from the Muzhe Village in Benggu Township, Xichou County, Yunnan declared a war against rocky desert in an attempt to ask the fields for more yields. They invented a distinctive land rehabilitation and sustainable use pattern called “transforming heavenand earth” that had been practiced in Southwest China’s karst areas. The key mechanism of the pattern was to develop terraced fields with well conserved soil, water and fertility by exploding rocks in the fields, building stone walls, gathering more soil, and improving soil quality and productivity for the fields in combination with building of irrigation facilities and roads, as well as with forestation and agriculture structure adjustment. The purpose of the pattern was to alleviate poverty in the karst areas by improving soil productivity and promoting agriculturaldevelopment. A typical area was studied with the help of Participatory Rural Appraisal (PRA) and the pattern was carried out there for fifteen years, have produced excellent ecological benefits and good economic benefits. Its application in the area approved that it was a sustainable land use pattern for rocky desert areas.
基金Supported by National Natural Science Foundation(41161081)
文摘The quantitative evaluation on land use /cover change as well as its influence on landscape pattern under the background of returning grain plots to forestry is significant to the sustainable utilization of land resources and ecological environment reconstruction in the southern Ningxia.Based on multi-temporal remote sensing data from four periods of Landsat TM /ETM,and combination of ecological quantity analytical method with GIS,the change of land use /cover and landscape pattern in Pengyang County of Ningxia Province were analyzed.The conclusions showed that the amount of each land use type was changed with different degrees,the area of forest /grass land increased,while farmland and unused land decreased.The change of landscape pattern was characterized as that the degree of landscape fragmentation,mixed distribution of patches,diversity index and evenness index increased gradually and then decreased,the connectivity between patches decreased gradually and then increased,and landscape shape presented irregular.
文摘城市用地空间扩张对生态环境的影响映射出人类社会活动和生态环境保护之间的交互作用,系统地研究城市空间无序蔓延所诱发的城市土地利用方式变化对城市生态环境的影响程度,对助推中国生态文明建设目标具有重要现实意义。为探究合肥市城市扩张对生态安全格局的影响程度,综合运用生态遥感指数、最小累积阻力模型、电路理论和斑块生成土地利用模拟模型,构建合肥市生态安全格局,识别生态夹点和生态障碍点,再从模拟验证的基础上(总体精度为94.71%,Kappa系数为90.04%,Fom值为0.102),预测了2030—2040年的城市扩张,并根据预测结果探讨城市扩张对区域生态安全格局影响程度。研究发现:合肥市生态环境质量整体呈现南高中低的分布格局,识别出合肥市生态源地共计35处,源地间活跃生态廊道70条,非活跃廊道共17条,生态夹点290个,生态障碍点112个。2020—2040年合肥市城乡、工矿居民用地、林地、水域和未利用土地面积将不断增加,而耕地以及草地面积将持续减少。2020—2040年期间城镇建成区分别侵占了生态廊道、源地、夹点、障碍点面积为55.95、10.51、1.04、1.35 km 2。研究结果可为今后快速发展城市的生态环境治理和国土空间生态保护修复工作提供理论依据和技术参考。
