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【答案】应助回帖
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181574060(fjtony163代发): 金币+10, 代发 2016-05-18 02:14:44
181574060(fjtony163代发): 金币+50, 代发 2016-05-18 02:15:01
fjtony163: 翻译EPI+1, 代发 2016-05-18 02:15:09
Plant, litter, and soil are the three most important sink of deposited N in forest ecosystems. Field 15N tracer experiments have made clear that most of deposited N retained in litter and soil layer in either a short or long term, and it was found that organic matter and microbial biomass were major sink of deposited N in these two layer. Over time （随着时间进行）, more deposited N could be assimilated by plant, accounting for 10-30% of recovered 15N tracer. In addition, leaching and gaseous losses were the main N output processes, which have received only scant attention in 15N tracer studies. These studies suggested that only a litter added 15N lost via these two processes. Fates of deposited N still remain controversial among these 15N tracer studies. One essential reason is different N forms differ in biogeochemistry cycle.
Plant, litter, and soil are the three most important sinks of deposited N in forest ecosystems. Field 15N tracer experiments have made clear that most of deposited N retained in litter and soil layers in a short or long term, mainly deposited in organic matter and microbial biomass. With time pass (Over time （随着时间进行）), more and more deposited N could be assimilated by plant, counting up to 10-30% of recovered 15N tracer. Leaching and gaseous losses were the main outputs of deposited N, which have received scant attention in 15N tracer studies. These studies suggested that only a little added 15N lost via these two processes. Fates of deposited N still remain controversial among these studies for one essential reason that N forms vary in biogeochemistry cycle. |
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