摘要
在区域生态安全格局创建中,生态用地破碎特征及机制分析利于生态冲突、空间组织要素及模式辨识。基于生态用地和测度指标界定,在RS与GIS支持下采用土地利用矢量图描述近20年长三角地区生态用地破碎特征,并定量分析其与坡度、水面和人为干扰与补偿的关系。研究表明:破碎特征分中等破碎F1在浙西南山区,高破碎F2、F3,F2在江苏湖荡与山体林地,F3在浙江沿海岛屿与群岛,低破碎F4在通扬泰、苏南沿江、杭嘉湖和宁绍平原;破碎演化特征分PDR、MPR≥2的FR1、FR2减弱,PDR、MPR≤2的FR3、FR4增强,PDR≥2但MPR≤2的FR5、FR6增强;破碎特征是地域自然差异与人类干扰的结果。FR2、FR4、FR5主要在地形大于18度山地或面积大于1000公顷的湖泊和河口,FR1、FR3在沿江地形低的平原,FR6在沿海地形较陡的岛屿及群岛;FR1、FR3人为干扰久、强度大,FR4、FR5、FR6自然约束下人为干扰弱但趋增,FR2人为干扰弱且生态补偿力度大。
The analysis on ecological land fragmentation and its dynamic mechanisms is helpful to recognize ecological conflicts,spatial elements and their buildup models of natural ecosystems during the process of building regional ecological safety patterns.The paper makes use of land-use vector graphs to describe ecological land fragmentation,and quantitatively explores the relationship between fragmentation properties and slope,water surface gradation and human interference and compensation activities in Yangtze River Delta area during the past of 20 years.It is concluded that the fragmentation ranks F1,F2,F3 and F4.F1 is middle-level fragmentation in southwest of Zhejiang.F2 and F3 are high-level fragmentation respectively in lakes and forestation land area of Jiangsu,and in coastal islands of Zhejiang.Low-level fragmentation F4 is in coastal areas of southern Jiangsu,lakes of Hangzhou,plains of Ningbo and so on.In this paper,the fragmentation is classified by weak FR1 and FR2,which PDR and MPR≥2,by intensive FR3 and FR4 of which PDR and MPR≤2,and by intensive FR5 and FR6 of which PDR≥2 but MPR≤2.It also points out that fragmentation is the result of natural difference and human interference.FR2、FR4 and FR5 mostly lie in high-lands beyond 18 angle or lakes with squares more than 1000ha.FR1 and FR3 lie in coastal plains.FR6 lies in islands of coastal slopes.FR1 and FR3 are interfered by people for a long time,but FR4,FR5 and FR6 are interfered weakly by human with natural restrictions,FR2 weakly but getting more compensation.
出处
《城市问题》
CSSCI
北大核心
2007年第9期7-11,19,共6页
Urban Problems
基金
国家自然科学基金重点项目(40435013)
关键词
生态用地
破碎度
演化机制
长江三角洲
ecological land
fragmentation
evolvement mechanism
Yangtze River Delta
