litterdecompositionandcandndynamicsasaffectedbynadditionsinasemiaridtemperatesteppeinnermongoliaofchina

	litterdecompositionandcandndynamicsasaffectedbynadditionsinasemiaridtemperatesteppeinnermongoliaofchina
	Peng Qin 1; Qi Yuchun 1; Dong Yunshe 1; He Yating 1; Xiao Shengsheng 2; Liu Xinchao 1; Sun Liangjie 1; Jia Junqiang 1; Guo Shufang 1; Cao Congcong 1
刊名	journalofaridland
	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
内容类型	期刊论文
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.