海拔影响毛竹林土壤有机碳组成的研究

Effects of Elevation on Soil Organic Matter Composition in Phyllostachy heterocycla cv. pubescens Forests

地理海拔是毛竹（Phyllostachy heterocycla cv．pubescens）生态系统重要的环境影响因素，同时影响着竹林土壤有机质结构及碳循环。研究采集了建瓯市3处高中低不同海拔的毛竹林土壤样品，利用化学分级，将土壤有机碳组成分为松结合态、稳结合态及紧结合态，旨在了解海拔高度对竹林土壤有机碳循环的影响。结果表明，随海拔高度增加，毛竹林土壤碳储量随之增加，高海拔竹林土壤碳储量比对低海拔增加了50．6％（0—60cm）。土壤中松结合态、稳结合态及紧结合态有机碳组份含量以高海拔为高，但随土壤剖面深度增加逐渐降低。然而，不同结合态有机碳占全碳的百分比则与海拔高度无关，松结合态及稳结合态有机碳比率则随土壤深度增加而增加。由此说明，海拔高度影响着有机碳的含量，土壤则影响着有机碳的储存形态。

Elevation is one of the most important environmental factors influencing plant growth and soil organic carbon turnover. Soil samples in high, mid and low elevation stands of Phyllostachy heterocycla cv. pubescens were collected from Jian-ou City, Fujian Province, China. Using the chemical fraetionation method, the soil organic carbons were classified as loose, stable and close combined components. The results showed that the soil organic carbon storage increased with the elevation, and it was 50.6% higher at the highest site than that at the lowest site. The loose, stable and close combined carbon contents increased with increasing elevation, but decreased with soil depth. However, the ratios of various combined carbon to total carbon showed unrelated to elevation, but increased with soil depth. Thus, the elevation influenced greatly the soil organic matter content of the bamboo forests, while the soil properties determined the soil organic matter composition.