应用生态学报2013，Vol.24Issue(7)：1777-1783,7.
长白山不同海拔梯度森林土壤中性糖分布特征
Distribution pattern of neutral sugar in forest soils along an altitude gradient in Changbai Mountains, Northeast China
摘要
Abstract
In July 2010,soil samples were collected from five typical forests (Pinus koraiensis and broadleaved mixed forest,Picea and Abies forest,Larix and Abies forest,Betula ermanii forest,and alpine tundra) along an altitude gradient on the northern slope of Changbai Mountains to investigate the distribution and quantity of neutral sugar in the soils and related affecting factors.The origins of the neutral sugar were differentiated to probe into the biochemical accumulation mechanisms of soil organic matter.There was a significant difference in the neutral sugar content among the forest soils.The relative content of soil neutral sugar' s carbon to soil organic carbon ranged in 80.55-170.63 mg C · g-1,and tended to be increased with elevated altitude.The multiple regression analysis showed that the mean temperature in growth season was the main factor affecting the relative content of soil neutral sugar,and low temperature was conducive to the accumulation of neutral sugar.The ratio of (galactose + mannose) / (arabinose + xylose) in the five soils was around 1.62-2.28,and had an increasing trend with elevated altitude,illustrating that the contribution of soil microbial neutral sugar to soil organic matter increased with elevated altitude.Soil microbial metabolic quotient declined significantly along elevated altitude,suggesting that in low temperature environment,soil microbial activity decreased but the carbon utilization efficiency enhanced.As a result,a significant portion of decomposed plant residues was transformed into microbial neutral sugar and accumulated stably in soil,and thus,increased the proportion of soil microbial neutral sugar.关键词
长白山/海拔/中性糖/植物和微生物贡献/微生物代谢熵Key words
Changbai Mountain/altitude/neutral sugar/plant and microorganism contribution/microbial metabolic quotient分类
农业科技引用本文复制引用
田秋香,张彬,何红波,张旭东,程维信..长白山不同海拔梯度森林土壤中性糖分布特征[J].应用生态学报,2013,24(7):1777-1783,7.基金项目
国家重点基础研究发展计划项目(2011CB403200)和中国科学院、国家外国专家局创新团队国际合作伙伴计划项目(KZCX2-YW-T06)资助. （2011CB403200）
