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Land Use Change and Its Effects on Soil Quality in a Typical Karst Watershed

Author: JiangYongJun
Tutor: YuanDaoXian
School: Southwest China Normal
Course: Physical Geography
Keywords: Land use change Temporal and spatial variation of soil quality Geostatistics Geographic Information Systems Land Consolidation Typical Karst Watershed Xiaojiang watershed
CLC: P271
Type: PhD thesis
Year: 2005
Downloads: 549
Quote: 1
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Karst ecological environment is a the edge of the desert region the fragile ecological environment. In recent years, China's karst areas due to rapid increase in population, the impact of human activities on the karst area strength increasing, exacerbated the vulnerability of karst ecological environment. Land use is a concentrated expression of the human activities, land-use change will have a profound impact on the ecological environment of the karst area. The impact of land use changes on the students read environment is an important part of the international land use / land cover change research. Karst region one of the main land degradation is irrational land use study karst area of ??land use change on soil quality changes not only be able to provide a scientific basis for the rational utilization of the land resources of the karst area, and contribute to the ecological environment of the karst area protect and promote the social, economic and environmental development. The paper medium spatial Luxi County of Yunnan Province, a small river karst watershed research unit, through data collection, field surveys and sampling and analysis, the use of geographic information systems, statistical analysis, geostatistics model and mathematical model to study the watershed 20 Temporal and spatial variation and changes in land use in a mechanism from the point angle combine research the mechanism of the watershed soil quality Temporal and spatial variation and change, and watershed land consolidation ecological evaluation for the rational use of land and water resources in southwest karst area theoretical basis. By interpreting aerial photographs and field surveys, mapping the small river valley in 1982 and 2003 land use map, under the support of GIS, spatial analysis and use of land use and landscape diversity index, dominance index, evenness index, fragmentation index, separation, and the focus shifted model spatial pattern of watershed land use changes, quantitative analysis reveals the spatial and temporal variation of watershed land use in the past 20 years. (1) 1982-2003, Xiaojiang watershed 610.12Km ~ 2 land use occurs a change in accounting for 59% of the watershed area; types of land use change mainly unused land conversion to farmland and woodland and woodland to farmland transformation of the three changes in the area of ??475.29km ~ 2, accounting for 77.9% of the change in the area of ??watershed land use; (2) 20 years of watershed land use dynamic concept changes very rapidly, integrated land use change dynamic degrees of 2.95%, a single land-use change dynamic concept orchard and farmland fastest, 34.09% and 10.55%, respectively; (3) watershed land use spatial pattern in the past 20 years has greatly changed, the number of patches of land use from 1014 to 1889, increased 86.3 % average plaque area decreased from 1.02 Km ~ 2 / a to 0.55 Km ~ 2 /, a decrease of 46.1%; basic configuration of the watershed land use spatial pattern mainly by large patches - small plaque mosaic configuration into to moderate plaque as the main, large - small plaque inlaid configuration; watershed land use spatial pattern index fragmentation index increased 84.6% to a 4.14% increase in the diversity index and evenness index dominance index decreased by 1.6%; the splitting index unused land, woodland, respectively, an increase of 114.58% and 69.64%, respectively, showed dispersed distribution trends, the arable land splitting index decreased by 45.86%, showing concentrated trends; 20 years the center of gravity of the various land use types to the different parties

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