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Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland | |
Diao, Huajie1,2; Chen, Xiaopeng2; Zhao, Xiang2; Dong, Kuanhu2; Wang, Changhui1,2 | |
2022 | |
发表期刊 | GEODERMA |
ISSN | 0016-7061 |
卷号 | 406 |
摘要 | The responses of soil total respiration (R-s) and its components (soil autotrophic respiration (R-a) and heterotrophic respiration (R-h)) to nitrogen (N) deposition have been widely evaluated in non-saline-alkaline grasslands. However, their responses to N addition under drought and wet conditions, especially in saline-alkaline grasslands, remain unclear. A two-factorial experiment involving N addition and precipitation changes (decreased or increased 50% precipitation relative to ambient) was conducted in a saline-alkaline grassland of Northern China, while soil respiration was measured in different treatment plots during two growing seasons (2018, 2019). Results showed that the addition of N or changes in precipitation alone had no significant effect on R-s, R-a or R-h in both years because root productivity and soil microbial biomass were not affected. However, N addition with increased precipitation synergistically augmented seasonal mean R-s and R-a by 25.7% and 46.8% in 2018, and by 42.4% and 89.3% in 2019, respectively, owing to the increase in plant productivity. The variation in R-a primarily contributed to variation in R-s, and the effect size of N addition on R-s and R-a were increased with precipitation. In addition, a structural equation model showed that the response of soil respiration to N addition and precipitation changes was regulated by soil salinization, in which the R-a was regulated by soil based cations while R-h was controlled by soil pH values. Our study highlights that N addition with increased precipitation preferentially affects plants rather than microorganisms, and that R-h was not sensitive to N addition and precipitation changes in saline-alkaline grassland. |
关键词 | Nitrogen addition Drought Precipitation increase Autotrophic respiration Heterotrophic respiration Saline-alkaline grassland |
学科领域 | Soil Science |
DOI | 10.1016/j.geoderma.2021.115541 |
收录类别 | SCI |
语种 | 英语 |
WOS关键词 | TEMPERATURE SENSITIVITY ; EXTREME PRECIPITATION ; CARBON BALANCE ; WATER CONTENT ; COMMUNITY ; RESPONSES ; DEPOSITION ; FERTILIZATION ; PRODUCTIVITY ; INCREASES |
WOS研究方向 | Science Citation Index Expanded (SCI-EXPANDED) |
WOS记录号 | WOS:000725534500005 |
出版者 | ELSEVIER |
文献子类 | Article |
出版地 | AMSTERDAM |
EISSN | 1872-6259 |
资助机构 | National Key R&D Program of China [2017YFA0604802] ; National Natural Science Foundation of China [31872406, 31870438, 31800402] ; Research projects of Shanxi Province's doctoral graduates and postdoctoral researchers working in Shanxi Province [SXBYKY2021053] |
作者邮箱 | dongkuanhu@sxau.edu.cn ; wangch@ibcas.ac.cn |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.ibcas.ac.cn/handle/2S10CLM1/28895 |
专题 | 植被与环境变化国家重点实验室 |
作者单位 | 1.Shanxi Agr Univ, Coll Grassland Sci, Taigu 030801, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Shanxi Agr Univ, Youyu Loess Plateau Grassland Ecosyst Res Stn, Taigu 030801, Peoples R China |
推荐引用方式 GB/T 7714 | Diao, Huajie,Chen, Xiaopeng,Zhao, Xiang,et al. Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland[J]. GEODERMA,2022,406. |
APA | Diao, Huajie,Chen, Xiaopeng,Zhao, Xiang,Dong, Kuanhu,&Wang, Changhui.(2022).Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland.GEODERMA,406. |
MLA | Diao, Huajie,et al."Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland".GEODERMA 406(2022). |
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