安徽省森林碳储量现状及固碳潜力

Current forest carbon stocks and carbon sequestration potential in Anhui Province, China

为阐明安徽省不同林龄的森林生态系统的碳储量现状,以及现有自然环境条件下顶极森林生态系统的固碳潜力,采用野外样地调查和BIOME4模型方法对此进行研究。安徽省森林生态系统的现状总碳储量为714.5 Tg C,其中植被碳402.1 Tg C、土壤碳312.4 Tg C。从幼龄林至过熟林的生长过程中,森林生态系统的总碳密度和植被碳密度都呈现增长趋势。但土壤碳密度从幼龄林至近熟林阶段呈增加趋势,近熟林以后出现减少趋势。安徽省幼龄林和中龄林占森林总面积的75%,若幼、中龄林发展到近熟林阶段,将增加125.4 Tg C。BIOME4模拟显示:当森林发展到气候顶极森林时,安徽省森林生态系统将增加245.7 Tg C,即总固碳潜力包括植被固碳153.7 Tg C,土壤固碳92.0 Tg C。

Aims This study was conducted to investigate carbon stocks in forest ecosystems of different stand ages in Anhui Province, and to identify the carbon sequestration potential of climax forests controlled by the natural environment conditions.Methods Data were collected based on field investigations and simulations were made with the BIOME4 carbon cycle model. Important findings Currently, the total forest carbon stocks in Anhui Province amounts to 714.5 Tg C： 402.1 Tg C in vegetation and 312.4 Tg C in soil. Generally, both the total and vegetation carbon density exhibit an increasing trend with the natural growth of forest stands. Soil carbon density increases from young to near mature forests, and then gradually decreases thereafter. Young and middle-aged forests account for 75% of the total forest area in Anhui Province, with potentially an additional 125.4 Tg C to be gained after the young and middle-aged forests reach near mature stage. Results of BIOME4 simulations show that potentially an additional 245.7 Tg C, including 153.7 Tg C in vegetation and 92 Tg C in soil, could be gained if the current forests are transformed into climax forest ecosystems in Anhui Province.