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 |
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发表时间：2006 |
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台 站：鼎湖山森林生态系统定位研究站 |
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作 者：FANG Yun—ting，ZHU Wei—xing，MO Jiang—ming，ZHOU Guo—yi，GUNDERSEN Per
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点 击 率：504430 |
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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 |
