Journal of Ecology and Rural Environment ›› 2017, Vol. 33 ›› Issue (6): 525-532.doi: 10.11934/j.issn.1673-4831.2017.06.006

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Quantitative Evaluation of Eco-Environment Quality of the Terrestrial Ecological Red Line Area in Wuzhong District, Suzhou City

JIA You-yu1,2, LI Hui2, WANG Zhao-qi2, DU Xiao-long2, YANG Yue2, LI Jian-long1,2   

  1. 1. Institute of Resources and Environment and Testing Technology Sciences, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010031, China;
    2. School of Life Sciences, Nanjing University, Nanjing 210093, China
  • Received:2016-09-21 Online:2017-06-25 Published:2017-06-15

Abstract:

In order to characterize spatial and temporal variation of the eco-environment in quality of the terrestrial ecological red line areas in Wuzhong District, Suzhou City, four indices were chosen, i. e. primary productivity, land surface temperature, land exposure degree and vegetation coverage of the area during the time-frames from July to August in the years of 2000-2015 when the vegetation grew optimally, for the four indices may well reflect eco-environment quality of the area; spatial principal component analysis method was used to build up an eco-environment aggregate index (Ef); co-environmental quality was divided into five grades (Ⅰ-Ⅴ), slope analysis and F significance test of Ef was performed; and slope-directive variances of monthly mean ecological factor (Ef) and ecological factor variation rate (ΔEf) was explored. Results show that during the period 2000-2015, ΔEf of the ecological red line areas varied between -0.08 and 0.06, and stayed below zero in about 43% of the areas and beyond zero in about 57%. The eco-environment quality on the whole was on a slowly rising trend, lingering in Grade Ⅱ with Ef being 0.700±0.001. Grading of the red line areas in terms of eco-environment quality shows that 3 in Grade Ⅰ, 7 in Grade Ⅱ, 1 in Grade Ⅳ and 1 in Grade Ⅴ. All the findings in this study may serve as important statistical supports and scientific evidence for protection of the ecological red line areas at Wuzhong District, Suzhou City, and contribute new thoughts and solutions to dynamic monitoring and management assessment of the ecological red line areas.

Key words: eco-environmental quality index, spatial principal component analysis, terrestrial ecological red line areas, quantitative slope directive variance

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