litterdecompositionandcandndynamicsasaffectedbynadditionsinasemiaridtemperatesteppeinnermongoliaofchina
文献类型：期刊论文
| 作者 | Peng Qin1 ; Qi Yuchun1; Dong Yunshe1; He Yating1; Xiao Shengsheng2; Liu Xinchao1; Sun Liangjie1; Jia Junqiang1; Guo Shufang1; Cao Congcong1
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| 刊名 | journalofaridland
 |
| 出版日期 | 2014 |
| 卷号 | 6期号:4页码:432 |
| ISSN号 | 1674-6767 |
| 英文摘要 | Litter decomposition is the fundamental process in nutrient cycling and soil carbon(C) sequestration in terrestrial ecosystems. The global-wide increase in nitrogen(N) inputs is expected to alter litter decomposition and,ultimately, affect ecosystem C storage and nutrient status. Temperate grassland ecosystems in China are usually N-deficient and particularly sensitive to the changes in exogenous N additions. In this paper, we conducted a 1,200-day in situ experiment in a typical semi-arid temperate steppe in Inner Mongolia to investigate the litter decomposition as well as the dynamics of litter C and N concentrations under three N addition levels(low N with 50 kg N/(hm~2·a)(LN), medium N with 100 kg N/(hm~2·a)(MN), and high N with 200 kg N/(hm~2·a)(HN)) and three N addition forms(ammonium-N-based with 100 kg N/(hm~2·a) as ammonium sulfate(AS), nitrate-N-based with 100 kg N/(hm~2·a) as sodium nitrate(SN), and mixed-N-based with 100 kg N/(hm~2·a) as calcium ammonium nitrate(CAN)) compared to control with no N addition(CK). The results indicated that the litter mass remaining in all N treatments exhibited a similar decomposition pattern: fast decomposition within the initial 120 days, followed by a relatively slow decomposition in the remaining observation period(120–1,200 days). The decomposition pattern in each treatment was fitted well in two split-phase models, namely, a single exponential decay model in phase I( 0.05). However, MN and HN treatments inhibited litter mass loss after 398 and 746 days, respectively(P 0.05). The effects of these two N addition forms differed greatly from those of CAN after 746 and 1,053 days, respectively(P 0.05). Our results indicated that exogenous N additions could exhibit neutral or inhibitory effects on litter decomposition, and the inhibitory effects of N additions on litter decomposition in the final decay stages are not caused by the changes in the chemical qualities of the litter, such as endogenous N and C concentrations. These results will provide an important data basis for the simulation and prediction of C cycle processes in future N-deposition scenarios. |
| 语种 | 英语 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/116337]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 作者单位 | 1.中国科学院地理科学与资源研究所 2.Jiangxi Provincial Research Institute for Soil and Water Conservation |
| 推荐引用方式 GB/T 7714 | Peng Qin,Qi Yuchun,Dong Yunshe,et al. litterdecompositionandcandndynamicsasaffectedbynadditionsinasemiaridtemperatesteppeinnermongoliaofchina[J]. journalofaridland,2014,6(4):432. |
| APA | Peng Qin.,Qi Yuchun.,Dong Yunshe.,He Yating.,Xiao Shengsheng.,...&Cao Congcong.(2014).litterdecompositionandcandndynamicsasaffectedbynadditionsinasemiaridtemperatesteppeinnermongoliaofchina.journalofaridland,6(4),432. |
| MLA | Peng Qin,et al."litterdecompositionandcandndynamicsasaffectedbynadditionsinasemiaridtemperatesteppeinnermongoliaofchina".journalofaridland 6.4(2014):432. |
入库方式： OAI收割
来源：地理科学与资源研究所
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