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Dynamics of soil inorganic nitrogen and their responses to nitrogen additions in three subtropical forests, south China
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出 版 社:Journal of Environmental Sciences  
发表时间:2006  
台  站: 鼎湖山森林生态系统定位研究站  
作  者:FANG Yun—ting,ZHU Wei—xing,MO Jiang—ming,ZHOU Guo—yi,GUNDERSEN Per  
点 击 率:319346
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关 键 字(英文):N deposition;N saturation;extractable inorganic N:soil solution inorganic N:subtropical China  
摘  要(英文):Three forests with difierent historical land—use.forest age.and species assemblages in subtropical C’hina were selected to evaluate current soil N status and investigate the responses of soil inorganic N dynamics to monthly ammonium nitrate additions. Results showed that the mature monsoon evergreen broadleaved forest that has been protected for more than 400 years exhibited an advanced soil N status than the pine fP/nus mOSSO~ DZ and pine—broadleaf mixed forests,both originated from the l 930’s clear—cut and pine plantation.Mature forests had greater extractable inorganic N pool,lower N retention capacity,higher inorganic N leaching, and higher soil C/N ratios.Mineral soil extractable NH 一N and NO3--N concentrations were significantly increased by experimental N additions on several sampling dates.but repeated AN0VA showed that the efect was not sign ificant over the whole year except NH4+一N in the mature forest.In contrast,inorganic N (both NH N and NO3--N1 in soil 20一cm below the surface was significantly elevated by the N additions.From 42% t0 74% ofN added was retained bv the upper 20 cm soils in the pine and mixed forests.while 0% 一70% was retained in the mature forest.Our results suggest that land—use history.forest age and species composition were likely t0 be some of the important factors that determine difering forest N retention responses to elevated N deposition in the study region.  
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Dynamics of soil inorganic nitrogen and their responses to nitrogen additions in three subtropical forests, south China_2006 方运霆.pdf
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