文献类型：期刊文献

英文题名：Low Nitrogen Retention in Soil and Litter under Conditions without Plants in a Subtropical Pine Plantation

作者：Xiong, Yanmei[1,2] Xu, Xingliang[2] Zeng, Hui[3] Wang, Huimin[2] Chen, Fusheng[4] Guo, Dali[2]

第一作者：Xiong, Yanmei;熊燕梅

通信作者：Xiong, YM[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[2]Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Qianyanzhou Ecol Stn, Beijing 100101, Peoples R China;[3]Peking Univ, Key Lab Cycl Econ, Sch Urban Planning & Design, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China;[4]Jiangxi Agr Univ, Coll Forestry, Nanchang 330045, Peoples R China

年份：2015

卷号：6

期号：7

起止页码：2387-2404

外文期刊名：FORESTS

收录：;EI(收录号：20153201115270);Scopus(收录号：2-s2.0-84938633042);WOS:【SCI-EXPANDED(收录号:WOS:000358590500007)】；

基金：We thank Yacheng Cao and Xi Wang for lab analysis of soil and litter ¹⁵N and Guigang Lin and Zhengxia Chen for their assistance in the field. This work was funded by the Natural Science Foundation of China (No. 31200405) and the National Basic Research Program of China (No. 2012CB416903).

语种：英文

外文关键词：Deposition - Ecosystems - Leaching - Nitrogen - Tropics

摘要：Soil acts as a major sink for added nitrogen (N) in forests, but it remains unclear about the capacity of soil to immobilize N under conditions without plant roots and whether added N interacts with ecosystem N to affect N retention. We added (NH4NO3)-N-15-N-15 to in situ soil columns (with leaching) and leaf litter (without leaching) of two tree species in a subtropical Pinus elliottii plantation. Soil and litter were collected three or eight months after N addition to measure concentrations of indigenous and exogenous N. About 70% of exogenous N was retained in soil three months after N addition, of which 65.9% were in inorganic forms. Eight months after N addition, 16.0% of exogenous N was retained in soil and 9.8%-13.6% was immobilized in litter. N addition increased the mineral release and nitrification of soil indigenous N. Loss of litter indigenous N was also increased by N addition. Our results suggest that N deposition on lands with low root activities or low soil carbon (C) contents may lead to increased N output due to low N immobilization. Moreover, the effects of added N on ecosystem indigenous N may decrease the capacity of soil and litter in N retention.