武夷山不同海拔植被土壤微生物量N时空变异  

Spatiotemporal variation of soil microbial biomass N under different vegetations along an altitude gradient in Wuyi Mountains of Southeast China

作　　者：王国兵[1] 王丰[1,2] 金裕华[1] 汪家社 阮宏华[1] 

机构地区：[1]南京林业大学森林资源与环境学院江苏省林业生态工程重点实验室,南京210037 [2]上海泽泉科技有限公司,上海200333 [3]福建省武夷山国家级自然保护区管理局,福建武夷山354315

出　　处：《生态学杂志》2011年第4期784-789,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30670313);南京林业大学高学历人才基金项目(163010063)资助

摘　　要：为了阐明我国中亚热带森林区土壤微生物量N的时空变异特征及其主要影响因子,在福建省武夷山国家自然保护区选择了常绿阔叶林(EBF,500m)、针叶林(CF,1200m)、亚高山矮林(SDF,1800m)和高山草甸(AM,2100m)4种不同海拔植被类型土壤(0～10、10～25、25～40cm)进行研究。结果表明,土壤微生物量N随着海拔高度的增加显著增加,在0～10cm土层中EBF、CF、SDF、AM土壤微生物量N分别为106.7、140.8、254.9和355.8mg·kg-1,不同海拔之间土壤微生物量N差异显著(P<0.05)。土壤微生物量N在0～10cm土壤表层最高,随着土壤深度的增加而逐渐减小。4种不同植被类型的3个土壤层次中土壤微生物量N均具有明显的季节动态变化,且变化规律一致,均表现为冬季最高,秋季次之,夏季最低。相关分析表明,在0～10cm土层影响土壤微生物量N沿海拔梯度空间变异的主要因子是土壤湿度、土壤有机质及全N含量,而影响土壤微生物量N季节性变异的主要因子是土壤水分与土壤温度。In order to understand the spatiotemporal variation of soil microbial biomass N and its main controlling factors in subtropical forest regions in China,0-10,10-25,and 25-40 cm soil samples were collected from the evergreen broadleaf forest（EBF,500 m a.s.l.）,coniferous forest（CF,1200 m a.s.l.）,subalpine dwarf forest（DF,1800 m a.s.l.）,and alpine meadow（AM,2100 m a.s.l.）along an altitude gradient in the Wuyi Mountains National Nature Reserve,Fujian Province from April 2006 to January 2007.With increasing altitude,the soil microbial biomass N increased significantly,being 106.7,140.8,254.9 and 355.8 mg·kg-1 in 0-10 cm soil layer under EBF,CF,SDF,and AM,respectively,and there was a significant difference（P0.05）among different altitudes.Soil microbial biomass N was the highest in 0-10 cm layer,and decreased gradually with soil depth.In the four ecosystems,there was a consistent seasonal variation of soil microbial biomass N,i.e.,the highest in winter,tended to decrease in spring,and the lowest in summer.Correlation analysis showed that in 0-10 cm soil layer,the main factors controlling the spatial variation of soil microbial biomass N along the altitude gradient were soil moisture,organic matter,and total N,while the main factors regulating the temporal variation of soil microbial biomass N were soil moisture and temperature.

关 键 词：武夷山 土壤微生物量N 时空变异 

分 类 号：S154.38[农业科学—土壤学]