矿山废弃地生态修复区植被碳库研究

目的]对甘肃省金川矿山废弃地修复区内主要的林分进行植物含碳率测定,估算修复区内的植被碳储量,为矿区生态修复系统纳入中国温室气体自愿减排提供科学依据。方法]利用干烧法对修复区主要物种进行有机含碳率测定,估算修复区内主要物种的平均含碳率、植被储碳密度和碳储量,并对其特征进行分析。结果]在修复区,乔木的含碳率在0.462 9~0.403 8,灌木的含碳率范围为0.413 9~0.453 6,8种草本植物的平均含碳率为0.144 5,整体上表现为:乔木灌木草本植物。金川矿山废弃地生态修复区植被平均储碳密度为6.209 2t/hm~2,总碳储量为635.10t,在总碳储量分配中,乔木较高,占86.71%,灌木次之(占12.65%),草本植物在总碳储量中所占比例不大。结论]对矿山废弃地进行生态恢复,能够增加矿区植被储碳量,在纳入中国温室气体自愿减排上有很大的潜力空间。

A Study on Vegetation Carbon Storage in Ecological Restoration Area of Abandoned Mines

Objective] To calculate the carbon content of the main forest stands in the abandoned land in Jinchuan mine of Gansu Province, and estimate carbon storage years of vegetation in restored areas to provide scientific basis for incorporating ecological restoration system into the voluntary reduction of greenhouse gases in China.Methods] The organic carbon content of the main species in the restoration area was determined by dry burning method. The average carbon content, vegetation carbon storage density and carbon storage of the main species in the restoration area were estimated and their characteristics were analyzed.Results] In the repair area, the carbon content of the trees was 0.462 9~0.403 8. The carbon content of the shrubs ranged from 0.413 9 to 0.453. The average carbon content of 8 herbaceous plants was 0.144 5, which was ranked as follows:trees > shrubs > herbs. The average carbon storage density of vegetation in the ecological restoration area of Jinchuan mine abandoned land was 6.209 2 t/hm², and the total carbon storage was 635.10 t. Among the total carbon storage allocation, the arbor was the highest, accounting for 86.71%, and the shrub was the second, accounting for 12.65%. Plants accounted for a small proportion of total carbon stocks.Conclusion] The ecological restoration of mine wasteland can increase the capacity of carbon storage in the mine area, and there is a great potential for the mine wasteland to be included into China''s voluntary greenhouse gas emission reduction.