江西森林植被土壤有机碳储量估算及空间分布特征

Estimate of Soil Organic Carbon Storage and Spatial Distribution in Forest Vegetation in Jiangxi Province

森林土壤有机碳是土壤有机碳的重要组成部分，在土壤有机碳库研究中有着重要作用。根据江西省第二次土壤普查资料，结合“十五”期间江西省森林资源二类调查资料，在GIS技术支持下采用土壤类型法估算江西省森林植被土壤有机碳储量，同时引入有机碳丰度指数这一指标，对有机碳在不同土壤和不同区域的分布特征进行分析。结果表明：江西省森林土壤在20cm和100cm深度的总有机碳储量分别为401．04×10^6t和1025．73×10^6t；20cm深度的土壤有机碳密度介于0．89—10．92kg／m^2，100cm深度的土壤有机碳密度介于2．71—35．61kg／m^2；100cm深度的土壤和区域有机碳丰度指数分别为0．3—3．57和0．96～1．03，与气候、植被、地形和人类活动等因素密切相关。

The forest soil organic carbon （SOC） is one of the important parts of the whole soil organic carbon pool. Study on the forest soil organic carbon plays an important role in the research of the soil organic carbon pool. In this paper, the soil organic carbon storage in forest vegetation in Jiangxi Province is estimated with inventory data base on GIS approach. With the index of soil organic carbon enrichment, the soil organic carbon distribution characteristics in different types of soil and different districts are analysed. The results show：the soil organic carbon storage amounts within 20cm and 100cm depth of forest vegetation in Jiangxi Province are 401.04 × 10^6 t and 1 025.73 × 10^6 t. The organic carbon density of 20 em of forest soil ranges from 0.89 - 10.92 kg/m^2 ,and the organic carbon density of 100 em of forest soil ranges from 2.71 - 35.61 kg/m^2. The indexes of soil organic carbon abundance of soil and district of 100 cm depth are between 0.3 -3.57 and 0.96- 1.03 respectively, whieh is closely related with climate, vegetation, landforms and human activity.