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杭州市土地利用变化及生态风险评价
田鹏1, 史小丽2, 李加林1,3, 王丽佳1, 刘瑞清1
1.宁波大学 地理与空间信息技术系, 浙江 宁波 315211;2.宁波大学 学报编辑部, 浙江 宁波 315211;3.宁波大学 东海研究院, 浙江 宁波 315211
摘要:
[目的]分析浙江省杭州市土地利用变化并对其生态风险评价,为保护该地区生态安全,合理开发土地资源和制定科学有效的规划提供理论依据。[方法]基于杭州市土地利用格局变化,构建生态风险指数,分析生态风险的时空变化及生态风险对土地利用的响应特征。[结果]①土地利用变化主要表现为:耕地减少和建设用地剧增;耕地、林地向建设用地转移,水域、草地向耕地、林地转移;土地利用强度减缓。②杭州市生态风险增加,生态风险值与土地利用呈明显正相关;中生态风险区占主导地位,高生态风险区主要分布在市辖区、杭州湾,西南部的淳安县中心,生态风险等级区以此为中心向周围递减。③生态风险等级以低—高等级转移为主,生态风险等级上升,年均转换速率呈下降趋势。④生态风险对土地利用变化的响应弹性时空分异较大,市区、建德市、桐庐县响应系数下降,其风险源和风险因子趋于多样化;其他单元的响应系数上升,土地利用对区域生态风险呈正响应弹性。[结论]杭州市土地利用格局时空变化明显,土地利用的快速变化加剧了杭州市的生态风险。
关键词:  土地利用  生态风险  空间自相关  弹性理论  杭州市
DOI:10.13961/j.cnki.stbctb.2018.04.044
分类号:
基金项目:宁波市重大科技计划项目“村镇生态化治理及社区可持续发展研究集成示范”(2015C110001)
Land Use Change and Ecological Risk Assessment in Hangzhou City
TIAN Peng1, SHI Xiaoli2, LI Jialin1,3, WANG Lijia1, LIU Ruiqing1
1.Department of Geography & Spatial Information Technology, Ningbo University, Ningbo, Zhejiang 315211, China;2.Journal Editorial Office, Ningbo University, Ningbo, Zhejiang 315211, China;3.East China Sea Institute, Ningbo University, Ningbo, Zhejiang 315211, China
Abstract:
[Objective] The analyses of land use change and ecological risk assessment in Hangzhou City, Zhejiang Province will provide theoretical basis for protecting ecological security, developing land resources reasonably and making scientific and effective planning.[Methods] Based on the change of land use pattern in Hangzhou City, the ecological risk index was constructed to analyze the spatial and temporal change of ecological risk and the response characteristics of ecological risk to land use.[Results] ① The land use change was mainly manifested as:the reduction of cultivated land and the increase of construction land; the transfer of cultivated land and forest land to construction land, the transfer of waters and grassland to cultivated land and forest land; the intensity of land use was slowed. ② The ecological risk increaseed in Hangzhou City, and the ecological risk value was positively correlated with land use. The moderate ecological risk area occupied the dominant position, the extremely high ecological risk areas were mainly distributed in the city area, Hangzhou Bay, southwest of the center of Chun'an County, the ecological risk area as a center to periphery decline. ③ The ecological risk grade was mainly low-high grade transfer, the ecological risk grade rises, and the annual average conversion rate was decreasing. ④ The response of ecological risk to land use change was more flexible in spatiotemporal space, and the response coefficient of urban areas, Jiande City and Tonglu County was declining. The risk sources and risk factors tended to diversify; the response coefficients of other units increased, and land use had a positive response to regional ecological risks.[Conclusion] The spatial and temporal change of land use pattern in Hangzhou City is obvious, and the rapid change of land use aggravates the ecological risk of Hangzhou City.
Key words:  land use  ecological risk  spatial autocorrelation  elasticity theory  Hangzhou City