神农架自然保护区土壤微生物生物量碳、氮沿海拔梯度的变化及其影响因素  

Changes of soil microbial biomass carbon and nitrogen along the altitude gradient and its influence factors in Shennongjia Natural Reserve,China

作　　者：丛静[1,2] 刘晓[2] 卢慧[2] 薛亚东[2] 刘学端[1] 尹华群[1] 李迪强[2] 张于光[2] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态重点实验室,北京100091

出　　处：《生态学杂志》2014年第12期3381-3387,共7页Chinese Journal of Ecology

基　　金：中央公益型科研院所基本科研业务费专项(CAFRIFEEP201101);湖北神农架国家级自然保护区本底资源调查子项目;国家自然保护区生物标本资源共享子平台项目资助

摘　　要：于2011年8月底对神农架自然保护区沿海拔变化的4种林型的土壤微生物生物量碳、氮进行研究,探讨土壤微生物生物量的变化规律和主要的环境影响因子。结果表明：表层土壤（0~10 cm）微生物生物量碳（MBC）和微生物生物量氮（MBN）含量大小顺序均为：亚高山灌丛〉寒温带针叶林〉针叶落叶阔叶混交林〉落叶阔叶林。土壤微生物生物量碳、氮均随海拔的升高而显著增加,与土壤有机碳和全氮的变化趋势一致,而微生物商（q MB）随海拔表现出先减小后增加的趋势。Pearson相关分析表明,土壤微生物生物量碳、氮随海拔的变化趋势与土壤有机碳和土壤全氮呈显著正相关（P〈0.05）,但与土壤湿度、土壤温度和土壤p H呈显著负相关（P〈0.05）。因此,土壤湿度、温度、p H、有机碳和全氮可能是影响土壤微生物生物量碳、氮沿海拔梯度变化的重要因子。In order to explore the variation trend of soil microbial biomass carbon（ MBC） and nitrogen（ MBN） along an elevation gradient and their main controlling factors in a mountain forest region in Shennongjia Natural Reserve,China,MBC and MBN at 0-10 cm soil layer were measured and their relationships with environmental factors were analyzed in four typical forest types in late August of 2011. The results showed that the values of MBC and MBN were in order of alpine shrub 〉 subalpine coniferous forest 〉 coniferous and broadleaf mixed forest 〉 deciduous broadleaved forest. MBC and MBN significantly increased with the elevation（ P 〈 0. 05）,in consistent with the trend of soil organic carbon and total nitrogen. However,soil microbial quotient（ q MB）decreased first and then increased with the elevation. Pearson’s correlation analysis showed that MBC and MBN were significantly positively correlated（ P 〈 0. 05） with soil organic carbon and total nitrogen,but negatively with soil moisture,soil temperature and soil p H（ P 〈 0. 05）.Therefore,soil moisture,soil temperature,soil p H,soil organic carbon and soil total nitrogen might be the important factors influencing the variations of soil microbial biomass along the elevation gradient in Shennongjia Mountain.

关 键 词：土壤微生物生物量碳 土壤微生物生物量氮 海拔梯度 微生物商 

分 类 号：S154.3[农业科学—土壤学]