祁连山青海云杉林生长状况及固碳潜力空间分异研究

Growth status of Qinghai spruce forest and its potential distribution of biomass C stock in Qilian Mountains, Northwestern China

为了认识祁连山区山地树木生长机制,利用野外调查数据结合区域分区分析青海云杉林的生长特征,结果表明,最小距离边界法确定最大林分大小-密度关系斜率,客观建立青海云杉林生长的最大边界;在研究区的东部,青海云杉林胸径生长速率是西部的4.5倍,整个研究区生长速率的空间变化趋势与多年平均降水量的变化趋势一致;从最大林分密度指数的空间差异看,祁连山东部青海云杉林树木之间的竞争弱于西部;当青海云杉林生长达到平衡态,利用最大基部盖度估算潜在碳储量,发现祁连山青海云杉林具有巨大的碳汇能力.

The growth characteristics of Qinghai spruce forest were analyzed by using field survey data and regional environmental data.The results showed that the slope of the maximum stand size-density relationship was determined by the minimum distance boundary method,which was more suitable for establishing the maximum growth boundary of Qinghai spruce forest.In the eastern part of the study area,the growth rate of diameter of a cross-section in Qinghai spruce forest was 4.5 times as much as that in the western part.The spatial variation trend of growth rate in the whole study area was consistent with the trend of multi-year average precipitation.The maximum stand density index was suggested that the competition among spruce trees in eastern Qilian Mountains was weaker than that in Western Qinghai Mountains.When the growth of Qinghai spruce forest reached an equilibrium state,there existed a maximum base cover of trees.The potential carbon storage was estimated by the maximum base cover,and it was found that the Qinghai spruce forest of Qilian Mountains had a huge carbon sink capacity.We concluded that restoration of these cleared and disturbed spruce forests would result in a huge amount of carbon sequestration and contribute to the mitigation of climate changes.