岷江干旱河谷典型生态防护林碳密度分配特征研究

Study on the carbon density and distribution characteristic of different ecological protective forest in arid valleys of the Minjiang River

通过评估岷江干旱河谷不同类型生态防护林碳积累能力以及垂直分配特征,旨在为区域植被恢复和碳汇计量提供理论依据。以岷江干旱河谷典型人工生态防护林为研究对象,对不同造林模式的生态防护林植被层、土壤层开展野外调查和分析。结果表明,岷江干旱河谷不同生态防护林的平均碳密度为126.32 t·hm^(-2),大小顺序为:岷江柏香樟林>刺槐林>油松侧柏林>岷江柏林>辐射松林,以岷江柏香樟林(156.44 t·hm^(-2))和刺槐林(150.76 t·hm^(-2))碳密度最高。碳密度垂直分布格局呈现为:土壤层>乔木层>灌草层>枯落物层,其中土壤层和乔木层占比超过97%。研究表明以岷江柏香樟林、刺槐林为代表的针阔混交林和阔叶林可作为岷江干旱河谷植被恢复的主要造林模式。

Carbon accumulation ability and vertical distribution characteristic among different forestation modes in arid valleys of the Minjiang River were estimated to provide a theoretical basis for regional vegetation restoration and carbon sequestration measurement.This study set up by field investigation and analysis of different forestation modes.Result showed that the average carbon density of different forestation modes in arid valleys of the Minjiang River was 126.32 t·hm^(-2),the carbon density sequence from the highest to the lowest were Cupressus chengiana and Cinnamomum camphora mixed forest>Robinia pseudoacacia forest>Pinus tabulaeformis and Platycladus orientalis mixed forest>Cupressus chengiana forest>Pinus radiata forest,within C.chengiana and C.camphora mixed forest(156.44 t·hm^(-2))and Robinia pseudoacacia forest(150.76 t·hm^(-2))ranked the first and second.The vertical distribution characteristics sequence of carbon density from the highest to the lowest were respectively soil layer>arborous layer>shrub and herbaceous plant layer>litter layer,and soil layer and arborous layer account for 97%.It was advised that the main forestation modes of revegetation in arid river valley of Minjiang River were Cupressus chengiana and Cinnamomum camphora mixed forestand Robinia pseudoacacia forest.