Nitrogen deposition and soil nitrogen dynamics in subtropical evergreen broad-leaved stands along an age-sequence
Nitrogen deposition and soil nitrogen dynamics in subtropical evergreen broad-leaved stands along an age-sequence
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亚热带常绿阔叶林随年龄序列的氮沉降和土壤氮动态
DOI：
10.4067/s0718-95162013005000021
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发表时间：
2013-06
影响因子：
3.9
通讯作者：
徐小牛
中科院分区：
文献类型：
--
作者：
徐小牛
为了揭示氮（N）沉降对森林生态系统的影响，我们对中国东部亚热带常绿阔叶林的土壤氮动态进行了两年的研究。当前大气氮沉降量为 18 kg ha-1year-1。径流中的氮通量从 17 到 23 kg ha-1year-1 不等，并且随着林龄的增加呈增加趋势。森林地表下的总氮通量范围为 7.3 至 9.3 kg ha-1year1，30 厘米土壤深度的总氮通量范围为 1.2 至 2.5 kg ha-1year1，其中老林中的值最高。老林分的净矿化潜力为19～24mg·kg-1月-1，比新林分高出30%～55%。 30 cm 土壤深度的无机氮浓度和通量与净矿化潜力显着相关（p < 0.05）。潜在氮转化率与土壤 C/N 比和 DON 显着相关（p < 0.05），但与森林地面 C/N 比无关。投入产出预算表明，我们所在地的森林是氮沉降的较好缓冲系统，远未达到氮饱和。
In order to reveal the effects of nitrogen (N) deposition on forest ecosystems, we investigated the soil N dynamics across a chronosequence of subtropical evergreen broad-leaved forest stands in eastern China for two years. Current atmospheric N deposition was 18 kg ha-1 year-1. Nitrogen fluxes in throughfall varied from 17 to 23 kg ha-1 year-1 with an increasing trend with stand age. The total N fluxes ranged from 7.3 to 9.3 kg ha-1 year1 under the forest floor and from 1.2 to 2.5 kg ha-1 year1 at 30-cm soil depth with the high values in the older stand. The net mineralization potentials in the old stands ranged from 19 to 24 mg kg-1 month-1, and were 30-55% higher than those in the young stands. The inorganic N concentration and flux at 30-cm soil depth were significantly (p < 0.05) correlated with net mineralization potential. The potential N transformation rates were significantly (p < 0.05) correlated with soil C/N ratio and DON while not with forest floor C/N ratio. Input-output budget suggests that the forest at our site is a finer buffering system to N deposition and is far from N saturation.
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影响因子：
3.7
作者：
Gundersen, P;Emmett, BA;Tietema, A
通讯作者：
Tietema, A
影响因子：
3
作者：
Chunqian Jiang;Xiaoshuai Zhang
通讯作者：
Chunqian Jiang;Xiaoshuai Zhang
影响因子：
3.2
作者：
Wen-Yao Liu;J. Fox;Zai-fu Xu
通讯作者：
Wen-Yao Liu;J. Fox;Zai-fu Xu
影响因子：
11.6
作者：
R. Brumme;P. Khanna
通讯作者：
R. Brumme;P. Khanna
影响因子：
9.7
作者：
Bengtsson, G;Bengtson, P;Månsson, KF
通讯作者：
Månsson, KF