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Studies on 32-year Land Use/Cover Change and Its Drivering Forces in Kunming Suburbs

Author: FengShi
Tutor: MaYouZuo;LiuWenJun
School: Xishuangbanna Tropical Botanical Garden
Course: Ecology
Keywords: land use/cover change landscape pattern gradient analysis canonical correlation analysis surburbs of Kunming
CLC: F301
Type: Master's thesis
Year: 2009
Downloads: 75
Quote: 1
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Abstract


Land use/cover change (LUCC) is an important part and one of the causes of the global change. Suburb area is the urban-rural interface, which has significant LUCC dynamic and attracts academic attention. While Kunming which is a western city in low latitude plateau sprawls, the phenomena of arbitrary cultivated land occupation became common and its ecological environment deterioration became worse. This study will try to analyze LUCC, change of landscape pattern by means of GIS/RS, landscape pattern qualification, and quantifying the drivering forces of LUCC. The objective of this study is to reveal the impacts of urbanization on LUCC and landscape pattern in Kunming suburbs. It’s helpful for reasonable urban planning, which has important scientific significance for regional ecological protection and urban sustainable development. The main conclusions include:(1) Characteristics of LUCC in Kunming suburbs1) Annual increasing rate of construction land was 8.36% from 1974 to 2006. It expanded towards northeast and south markedly. Its growth speed kept a rising trend, the peak of which shifted outwards from the heartland. The construction land expanded to 20 km from the heartland. Cultivated land was the main source of construction land. The proportion of other types became larger from 2000 to 2006. Forest, shrub and cultivated land were the main land use/cover types in Kunming suburbs from 1974 to 2006. Percents of these three types declined as construction land increased. The forest area declined significantly from 1974 to 1992, and then increased from 1992 to 2000. It declined from 2000 to 2006 again. Shrub exhibited the opposite trend. Cultivated land and waste grassland kept decreasing. The concentrated distribution became further to the heartland.2) Percent of forest and shrub in each zone increased first, then declined and increased again from the heartland during 32 years. The peak of forest arrived at 26km from the heartland. The low range of shrub is between 22km to 32km responding to high range of forest. Peak of cultivated land declined obviously and extended outwards. Dominance of cultivated land reduced significantly.(2) Landscape pattern and its change in Kunming suburbs1) The fragmentation of whole landscape and four districts became worse. They exhibited a tendency of diversification and homogenization. Patch mosaic became more complicated and connection among patches became lower. Landscape shape became complicate first and then simple. Fragmentation in Wuhua and Panlong district was much larger than others, meanwhile diversification and homogenization in Guandu district was highest. The fragmentation of forest, shrub and cultivated land became larger.2) The distance between cultivated land to the heartland increased. Many large areas of cultivated land disappeared gradually. Dominance of cultivated land in four districts significantly declined in 32 years. Fragmentation became worse in Wuhua, Panlong and Guandu district year by year.(3) Characteristics of gradient differentiation in SW-NE/SE-NW transects1) Change trends of the index showed a spatial gradient of patch fragment which enhanced at first and then weakened from the heartland. Curves of index became flat since 1992. It showed high connection and low diversification in 1974 of four directions. Index varied significantly between 18km and 30km in northeast and 10km to 20km from urban center in northwest because of urbanization.2) The difference of southwest beyond 12km and southeast was not obvious. Dominance of forest exhibited spatial gradient from the heartland. Its peaks and dominance in each zone declined annually. Dominance of shrub in each zone increased annually. Construction land became the main type instead of cultivated land near the heartland. Its dominance increased, while cultivated land’s declined.(4) The drivers of LUCC in Kunming suburbs The results showed that there was a close relationship between LUCC and the social-ecological factors in Kunming suburbs through canonical correlation analysis. Population density played a important role in the change of forest structure in Kunming suburbs. The tertiary industry was the basic industry to promote urbanization, which was the important driving force of construction land increasing. Meanwhile, cultivated land and gross agricultural output value had a strong correlation.This study puts forward some suggestions:raising land utilization rate, building compact city; implementing strict cultivated land ptotection, developing high-quality, high yield and efficiency agriculture; strengthening the continuous recovery of forest.

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CLC: > Economic > Agricultural economy > Agricultural economic theory > Land Economics
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