Analysis of Changes in Land Use Landscape Pattern in Wenchuan County

doi:10.13466/j.cnki.lczyyj.2024.04.008

Abstract

Abstract:

The use of Geographic Information Systems and remote sensing technology to analyze the spatiotemporal changes in regional land use landscape patterns provide technical support for understanding ecological environmental changes and ecosystem stability.Taking Wenchuan County,Sichuan Province as the research area,the spatiotemporal evolution of land use patterns is analyzed using the comprehensive land use index and landscape ecological index methods.1)From 2007 to 2020,the total areas of cultivated land and forest land in Wenchuan County decreased,while the area of construction land increased.2)The comprehensive land use index in Wenchuan County showed an increasing trend.Between 2007 and 2014,the land use index in towns and villages in the northeastern and southeastern parts of Wenchuan County rebounded rapidly.From 2014 to 2020,the land use index in the western towns of Wenchuan County underwent significant changes.Through a combination of artificial measures and natural restoration,vegetation recovery improved and the land use structure became increasingly reasonable.3)From 2007 to 2020,the patch density and landscape shape index in Wenchuan County initially increased,then decreased,while the aggregation index showed an initial decrease followed by an increase.These trends indicate that the earthquakes initially intensified landscape fragmentation,increased heterogeneity,reduced connectivity between landscape patches,and significantly degraded the ecological environment.However,driven by factors such as post-disaster reconstruction and ecological protection and restoration,the impact of earthquakes and other disasters gradually weakened.As a result,landscape fragmentation decreased,landscape heterogeneity reduced,and landscape shape and connectivity between patches returned to pre-earthquake levels.The regional ecological environment gradually improved.

Key words: remote sensing, land use, landscape pattern, Wenchuan County

CLC Number:

TP79

ZENG Shuangbei, ZHANG Dawei, DU Zongyi. Analysis of Changes in Land Use Landscape Pattern in Wenchuan County[J]. Forest and Grassland Resources Research, 2024, (4): 70-77.

Figures/Tables 9

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土地利用类型	2007年	2014年	2020年
耕地	136.7	147.4	127.4
林地	2 933.3	2 914.1	2 932.4
建设用地	5.8	8.7	9.1

乡镇	综合指数			变化率
乡镇	2007年	2014年	2020年	2007—2014年	2014—2020年
绵虒镇	203.71	203.80	203.60	0.04	-0.10
威州镇	210.40	212.13	212.06	0.82	-0.03
水磨镇	218.25	217.96	214.25	-0.13	-1.71
耿达镇	190.79	190.05	188.94	-0.39	-0.59
灞州镇	205.22	205.74	205.43	0.25	-0.15
卧龙镇	194.46	193.69	194.70	-0.39	0.52
漩口镇	216.58	215.77	211.02	-0.38	-2.20
映秀镇	205.50	206.96	205.03	0.71	-0.93
三江镇	201.18	201.62	201.43	0.22	-0.10