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文献详情 >Nitrogen in soils beneath 18 6... 收藏

Nitrogen in soils beneath 18 65 year old stands of subtropical evergreen broad-leaved forests in Laoshan Mountains in Eastern China

Nitrogen in soils beneath 18 65 year old stands of subtropical evergreen broad-leaved forests in Laoshan Mountains in Eastern China

作     者:GU Feng ZHANG Kai ZHANG Yun-qi WANG Qin XU Xiao-niu 

作者机构:Department of Forest Science Anhui Agricultural University Hefei 230036 China 

出 版 物:《Journal of Forestry Research》 (林业研究(英文版))

年 卷 期:2011年第22卷第4期

页      面:583-590页

核心收录:

学科分类:09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基  金:supported by National Natural Science Foundation of China (NSFC Nos. 30771719 and 30471386) 

主  题:microbial biomass nitrogen nitrogen availability nitrogenmineralization soil horizon subtropical forest 

摘      要:Monitoring of soil nitrogen (N) cycling is useful to assess soil quality and to gauge the sustainability of management practices. We studied net N mineralization, nitrification, and soil N availability in the 0-10 cm and 11-30 cm soil horizons in east China during 2006-2007 using an in situ incubation method in four subtropical evergreen broad-leaved forest stands aged 18-, 36-, 48-, and 65-years. The properties of surface soil and forest floor varied between stand age classes. C:N ratios of surface soil and forest floor decreased, whereas soil total N and total organic C, available P, and soil microbial biomass N increased with stand age. The mineral N pool was small for the young stand and large for the older stands. NO3^--N was less than 30% in all stands. Net rates of N mineralization and nitrification were higher in old stands than jn younger stands, and higher in the 0-10 cm than in the 11-30 cm horizon. The differences were significant between old and young stands (p 〈 0.031) and between soil horizons (p 〈 0.005). Relative nitrification was somewhat low in all forest stands and declined with stand age. N trans- formation seemed to be controlled by soil moisture, soil mierobial biomass N, and forest floor C:N ratio. Our results demonstrate that analyses of N cycling can provide insight into the effects of management disturbances on forest ecosystems.

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