煤矿废弃地复垦耕地生态系统的可持续性评价

Sustainability evaluation of reclaimed cultivated land ecosystem in coal mine wasteland

为了评价煤矿区复垦后耕地系统的可持续性,在对赵固煤矿未沉陷区、稳定沉陷区以及不稳定沉陷区复垦耕地的土壤及作物指标进行测定的基础上,基于三角形面积法,将测定的13项指标划分并转换为土壤理化性质指数、土壤微生物特性指数及作物指数,计算不同复垦耕地的可持续性指数(即三角形面积)。研究发现:未沉陷区复垦耕地的可持续性指数(1.80)大于可持续性指数临界值(1.30),可持续性较好;稳定沉陷区复垦耕地的可持续性指数(1.24)接近可持续性指数临界值;不稳定沉陷区复垦耕地可持续性指数(0.88)低于可持续性指数临界值,为不可持续状态。综上,煤矿区废弃地复垦后耕地的沉陷状态越稳定,可持续性越好,越有利于农业生产。

To evaluate the sustainability of reclaimed cultivated land,the soil and crop indexes were determined by sampling in subsidence-free area,stable subsidence area and unstable subsidence area in Zhaogu mine area. The 13 indexes measured were divided into soil physicochemical index,soil microbial index and crop index. Then,the sustainability index was calculated based on the triangle area method. It was shown that the sustainability index of reclaimed land in subsidence-free area( 1. 80) was higher than the threshold of sustainability index( 1. 30). The sustainability index in the stable subsidence area( 1. 24) was close to the threshold of sustainability index,yet the sustainability index in the unstable subsidence area( 0. 88) was lower than the threshold of sustainability index. In summary,the more stable the subsidence state is,the more sustainable the reclaimed is for agricultural production.