Combined effects of nitrogen addition and organic matter manipulation on soil respiration in a Chinese pine forest
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- 作者：Jinsong Wang ; L. Wu ; Chunyu Zhang…
- 关键词：Soil respiration ; Organic matter treatment ; Nitrogen supply ; Interactive effect ; Chinese pine forest
- 刊名：Environmental Science and Pollution Research
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：23
- 期：22
- 页码：22701-22710
- 全文大小：855 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Environment
Environment
Atmospheric Protection, Air Quality Control and Air Pollution
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
Industrial Pollution Prevention - 出版者：Springer Berlin / Heidelberg
- ISSN：1614-7499
- 卷排序：23
文摘
The response of soil respiration (Rs) to nitrogen (N) addition is one of the uncertainties in modelling ecosystem carbon (C). We reported on a long-term nitrogen (N) addition experiment using urea (CO(NH2)2) fertilizer in which Rs was continuously measured after N addition during the growing season in a Chinese pine forest. Four levels of N addition, i.e. no added N (N0: 0 g N m−2 year−1), low-N (N1: 5 g N m−2 year−1), medium-N (N2: 10 g N m−2 year−1), and high-N (N3: 15 g N m−2 year−1), and three organic matter treatments, i.e. both aboveground litter and belowground root removal (LRE), only aboveground litter removal (LE), and intact soil (CK), were examined. The Rs was measured continuously for 3 days following each N addition application and was measured approximately 3–5 times during the rest of each month from July to October 2012. N addition inhibited microbial heterotrophic respiration by suppressing soil microbial biomass, but stimulated root respiration and CO2 release from litter decomposition by increasing either root biomass or microbial biomass. When litter and/or root were removed, the “priming” effect of N addition on the Rs disappeared more quickly than intact soil. This is likely to provide a point of view for why Rs varies so much in response to exogenous N and also has implications for future determination of sampling interval of Rs measurement.