不同海拔毛竹林土壤养分及碳储量的研究

Soil Nutrients and Carbon Stocks in Phyllostachys heterocycla cv. pubescens Ecosystems at Various Elevations in Jianou City

海拔高度是影响毛竹生长的重要环境因素。通过系统调查分析建瓯市不同海拔高度毛竹林生态系统中土壤养分状况,比较研究海拔高度对毛竹林生态系统碳贮量的影响。结果表明,随海拔高度增加,土壤全氮随之增加,而全磷及全钾反而下降,pH、无机氮、速效磷及速效钾无明显规律。毛竹林生物量及土壤碳量均随海拔增加而增加,高海拔毛竹生态系统的碳储量要比低海拔高31.8%。相关分析表明,毛竹林土壤碳储量与土壤全氮及速效养分存在正相关。海拔高度是影响毛竹林生态系统碳储量估算的重要因子,进一步定量化海拔对系统碳储量的影响极为必要。

Altitude is one of the most important factors influencing carbon stocks of Phyllostachy heterocycla cv. pubescens ecosystems. In this study, an investigation of soil nutrients and carbon components in the bamboo ecosystems at various elevations was conducted. Results showed that soil total nitrogen increased with the elevation, but total phosphorus and potassium decreased. Soil pH, inorganic nitrogen, available phosphorus and potassium showed no stable trend with the elevation. The bamboo biomass and soil carbon stocks increased with elevation. Carbon stock in the high elevation site was higher 31.8% than that in the low elevation site. This suggested that altitude exerted a great impact on carbon stock of the bamboo ecosystem. A further quantification of effect of elevation needs to be obtained for the precise carbon estimation of bamboo ecosystem.