The Effects of Warming and Nitrogen Addition on Soil Nitrogen Cycling in a Temperate Grassland, Northeastern China

被引:43
|
作者
Ma, Lin-Na [1 ,3 ]
Lu, Xiao-Tao [4 ]
Liu, Yang [2 ]
Guo, Ji-Xun [2 ]
Zhang, Nan-Yi [2 ]
Yang, Jian-Qin [2 ]
Wang, Ren-Zhong [1 ]
机构
[1] Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing, Peoples R China
[2] NE Normal Univ, Key Lab Vegetat Ecol, Minist Educ, Changchun, Jilin, Peoples R China
[3] Chinese Acad Sci, Grad Univ, Beijing, Peoples R China
[4] Chinese Acad Sci, Inst Appl Ecol, State Key Lab Forest & Soil Ecol, Shenyang, Peoples R China
来源
PLOS ONE | 2011年 / 6卷 / 11期
关键词
REACTIVE NITROGEN; N MINERALIZATION; INNER-MONGOLIA; CLIMATE-CHANGE; CARBON; ECOSYSTEM; RESPONSES; FOREST; NITRIFICATION; AVAILABILITY;
D O I
10.1371/journal.pone.0027645
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Background: Both climate warming and atmospheric nitrogen (N) deposition are predicted to affect soil N cycling in terrestrial biomes over the next century. However, the interactive effects of warming and N deposition on soil N mineralization in temperate grasslands are poorly understood. Methodology/Principal Findings: A field manipulation experiment was conducted to examine the effects of warming and N addition on soil N cycling in a temperate grassland of northeastern China from 2007 to 2009. Soil samples were incubated at a constant temperature and moisture, from samples collected in the field. The results showed that both warming and N addition significantly stimulated soil net N mineralization rate and net nitrification rate. Combined warming and N addition caused an interactive effect on N mineralization, which could be explained by the relative shift of soil microbial community structure because of fungal biomass increase and strong plant uptake of added N due to warming. Irrespective of strong intra-and inter-annual variations in soil N mineralization, the responses of N mineralization to warming and N addition did not change during the three growing seasons, suggesting independence of warming and N responses of N mineralization from precipitation variations in the temperate grassland. Conclusions/Significance: Interactions between climate warming and N deposition on soil N cycling were significant. These findings will improve our understanding on the response of soil N cycling to the simultaneous climate change drivers in temperate grassland ecosystem.
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页数:8
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