Nitrogen addition stimulates different components of soil respiration in a subtropical bamboo ecosystem |
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| Institution: | 1. College of Forestry, Sichuan Agricultural University, Xingkang Road 46, Ya''an 625014, Sichuan, PR China;2. Institute of Ecological Forestry, Sichuan Agricultural University Chengdu Campus, Wenjiang District, Chengdu 611130, Sichuan, PR China;3. Personnel Department, Sichuan Agricultural University, Xingkang Road 46, Ya''an 625014, Sichuan, PR China;1. Institute of Biology, Freie Universität Berlin, Altensteinstr. 6, 14195 Berlin, Germany;2. Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany;3. Geoecology, University of Tübingen, Rümelinstraße 19-23, 72070 Tübingen, Germany;4. Albrecht von Haller Institute of Plant Sciences, University of Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany;5. Department of Biology, Lund University, Box 118, 22100 Lund, Sweden;6. Departamento de Ciencias Naturales, Universidad Técnica Particular de Loja, Loja, Ecuador;1. Natural Resources Institute Finland, Finland;2. University of Jyväskylä, Finland;1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;2. Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;3. Key Laboratory of Forest Ecology and Environment, China''s State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;4. University of Chinese Academy of Sciences, Beijing 100039, China;1. Huitong Experimental Station of Forest Ecology, Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, PR China;2. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, PR China;3. College of Forestry, Taishan Forest Ecosystem Research Station, Shandong Agricultural University, Taian 271018, PR China;4. Jiangxi Academy of Forestry, Nanchang 330032, PR China;5. Huitong National Research Station of Forest Ecosystem, Huitong 418307, PR China;1. College of Resources and Environmental Science, East China Normal University, Shanghai 200241, China;2. Tiantong National Station of Forest Ecosystem, Chinese National Ecosystem Observation and Research Network, Ningbo 315114, Zhejiang Province, China;3. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83 Umeå, Sweden;4. Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA |
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| Abstract: | Soil respiration is an important carbon (C) flux of global C cycle, and greatly affected by nitrogen (N) addition in the form of deposition or fertilization. However, the effects of N addition on the different components of soil respiration are poorly understood. The aim of this study is to investigate how the components of soil respiration response to N addition and the potential mechanisms in a subtropical bamboo ecosystem. Four N treatment levels (0, 50, 150, 300 kg N ha?1 year?1) were applied monthly in a Pleioblastus amarus bamboo plantation since November 2007. Total soil respiration (RST) and soil respiration derived from litter layer (RSL), root-free soil (RSS), and plant roots (RSR) were measured for one year (February 2010 to January 2011). The results showed that the mean rate of RST was 428 ± 11 g C m?2 year?1, and RSL, RSS, RSR contributed (30.2 ± 0.7)%, (20.7 ± 0.9)%, and (49.1 ± 0.7)%, respectively. The temperature coefficients (Q10) of RST, RSL, RSS, and RSR were 2.87, 2.28, 3.09, and 3.19, respectively, in control plots. Nitrogen additions significantly increased RST and its three components. RSR was stimulated by N additions through increasing fine root biomass and root metabolic rate. The positive effects of N additions on soil fertility, microbial activity, and the quality and amount of aboveground litterfall also stimulated other CO2 production processes. In the background of increased N input, response of RST and components of RST are primarily due to the positive response of plant growth in this bamboo ecosystem. |
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