Climate Change Data Portal
| DOI | 10.1016/j.catena.2021.105366 |
| Nitrogen addition alters C-N cycling in alpine rangelands: Evidence from a 4-year in situ field experiment | |
| Liu, Yongwen; Wei, Da; Tenzintarchen; Zhao, Jingxue; Geng, Xiaodong; Dai, Dongxue; Xu-Ri | |
| 通讯作者 | Liu, YW ; Xu-Ri (通讯作者) |
| 发表日期 | 2021 |
| ISSN | 0341-8162 |
| EISSN | 1872-6887 |
| 卷号 | 203 |
| 英文摘要 | Nitrogen (N) deposition has been critical to the increase in the terrestrial carbon (C) sink in recent decades. Clarifying the C-N cycling responses in rangelands to N enrichment is essential for quantitatively understanding and predicting how N enrichment influences terrestrial C sinks. However, the N enrichment effects on rangeland C-N cycling under livestock grazing, rather than grazing exclusion, have rarely been investigated. Here, we conducted a 4-year in situ field experiment to examine the effects of multilevel N addition (NH4NO3: 0, 10, 20, 40, 80 and 160 kg N ha(-1) yr(-1) ) on soil N characteristics and ecosystem C fluxes in an alpine pasture on the Tibetan Plateau. We found that there were no significant differences in the soil organic C, soil total N, or soil C:N ratio across the six N addition levels. Over the four years, N addition generally increased the average soil inorganic N, with an increase ranging from 6% for the addition of 10 kg N ha(-1) yr(-1) to 292% for the addition of 160 kg N ha(-1) yr(-1). Such an increase in soil inorganic N was dominated by soil NO3--N enrichment rather than NH4+-N variations, resulting in a decreased soil NH4-/NO3 ratio. Unlike the significant response of soil inorganic N to N addition, the net ecosystem CO2 exchange, gross ecosystem productivity and ecosystem respiration averaged over the growing season were not significantly changed by N addition in the third and fourth years, possibly due to the regulation by livestock grazing. In the last experimental year, N addition significantly enhanced belowground biomass but had no significant effect on aboveground biomass, leading to an increase in the root:shoot ratio. Our study highlights that N addition altered C-N cycling in alpine pastoral ecosystems and provides experimental evidence for quantitatively parameterizing the C process responses to N variations in terrestrial ecosystem models. |
| 关键词 | BIOMASS ALLOCATIONNH3 VOLATILIZATIONGAS EMISSIONSICE COREECOSYSTEMDEPOSITIONSOILRESPONSESFERTILIZATIONRESPIRATION |
| 英文关键词 | Alpine pasture; Nitrogen deposition; Livestock grazing; Carbon sink; Ecosystem respiration; Soil inorganic nitrogen; Tibetan Plateau |
| 语种 | 英语 |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
| WOS记录号 | WOS:000654354000060 |
| 来源期刊 | CATENA
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/260388 |
| 推荐引用方式 GB/T 7714 | Liu, Yongwen,Wei, Da,Tenzintarchen,et al. Nitrogen addition alters C-N cycling in alpine rangelands: Evidence from a 4-year in situ field experiment[J]. 中国科学院青藏高原研究所,2021,203. |
| APA | Liu, Yongwen.,Wei, Da.,Tenzintarchen.,Zhao, Jingxue.,Geng, Xiaodong.,...&Xu-Ri.(2021).Nitrogen addition alters C-N cycling in alpine rangelands: Evidence from a 4-year in situ field experiment.CATENA,203. |
| MLA | Liu, Yongwen,et al."Nitrogen addition alters C-N cycling in alpine rangelands: Evidence from a 4-year in situ field experiment".CATENA 203(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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