江苏北部景观生态评价

Landscape Ecological Evaluation in Northern Jiangsu

景观生态评价就是对景观生态现状进行评定，它是景观规划、管理、保护的基础．以地貌为基本线索，以植被为标志，建立江苏北部的景观生态分类系统（包括６个景观型，２３个景观亚型）．根据景观型之间的相似性与差异性，选取两套指标对各景观亚型进行生态评价．通过评价指标的等级化处理和评价指标权重的确定，计算出各景观亚型的综合评价指数．据此划分出极危急、危急、正常三种景观生态现状类型．统计结果显示，江苏北部生态现状极危急、危急、正常景观面积分别占总面积的１３．７％，３２．１％，５４．２％，表明江苏北部景观生态形势非常严峻。

Landscape ecological evaluation is to assess the present ecological situation of landscapes.Its a basis for landscape planning,management and conservation.Based upon geomorphology and vegetation,6 landscape types and 23 landscape subtypes are classified in northern Jiangsu.According to the similarities and differences between landscape types,two sets of indices are used to appraise landscape subtypes.Through grading and weighting thses indices,the composite evaluation index (CEI) is calculated.By CEI,normal landscape (CEI>0.70),critical landscape (0.50<CEI0.70) and extremely critical landscape (CEI0.50) are identified.The result of statistics reveals the areas of normal landscape,ctrtical landscape and extremely critical landscape respectively account for 13.7%,32.1% and 54.2% of the total area of northern Jiangsu.This shows landscape ecological conditions are serious and landscape ecological restoration is imminent in the region.