Peng Qin1; Qi Yuchun1; Dong Yunshe1; He Yating1; Xiao Shengsheng2; Liu Xinchao1; Sun Liangjie1; Jia Junqiang1; Guo Shufang1; Cao Congcong1
Source Publicationjournalofaridland
AbstractLitter 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.
Document Type期刊论文
2.Jiangxi Provincial Research Institute for Soil and Water Conservation
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
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.
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