Long-term and short-term effects of nitrogen addition on soil acidification in a temperate steppe
文献类型：期刊论文
| 作者 | Hao, Tianxiang |
| 刊名 | PLANT AND SOIL
 |
| 出版日期 | 2025-12-10 |
| 卷号 | N/A |
| 关键词 | Soil acidification Soil pH Grassland Nitrogen addition |
| ISSN号 | 0032-079X |
| DOI | 10.1007/s11104-025-08184-x |
| 产权排序 | 1 |
| 文献子类 | Article ; Early Access |
| 英文摘要 | Background and aimsSoil acidification is a critical indicator of grassland degradation and a growing concern in temperate steppes. However, acidification rates and their biogeochemical drivers remain poorly quantified. This study aimed to assess acidification rates and clarify the dominant acidification mechanisms under both short- and long-term nitrogen (N) addition.MethodsA field experiment was conducted in a temperate steppe, with three treatments: natural condition (grazing exclusion and atmospheric N deposition), short-term (2-year), and long-term (15-year) N addition (12 g N m-2 yr-1). Soil acidification rates were calculated using a mass balance approach considering H+ production from N cycling, plant uptake, and bicarbonate leaching.ResultsUnder natural conditions, the acidification rate of topsoil (0-10 cm) was 0.59 kmolc ha-1 yr-1, accompanied by a 0.66-unit pH decline over 15 years. Long- and short-term N additions significantly increased the acidification rates to 1.52 and 1.27 kmolc ha-1 yr-1, respectively, and reducing topsoil pH by 1.1 and 0.3 units. N cycling was the dominant acidification driver. Acidification was closely associated with Ca2+ depletion and Mn2+ enrichment. Projections based on observed acidification rates and theoretical soil acid-buffering characteristics indicate that, soil pH would decline to the critical threshold of 4.5 within 42 years under current conditions, and within 16-19 years under N addition; the combination with mowing may further shorten this period to 8-11 years.ConclusionThese findings highlight the severity of soil acidification in temperate steppes and the urgent need for mitigation strategies to sustain soil health and ecosystem functions. |
| URL标识 | 查看原文 |
| WOS关键词 | CHINA ; DEPOSITION ; PATTERNS |
| WOS研究方向 | Agriculture ; Plant Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:001635203200001 |
| 出版者 | SPRINGER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/219451]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Hao, Tianxiang |
| 作者单位 | Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hao, Tianxiang. Long-term and short-term effects of nitrogen addition on soil acidification in a temperate steppe[J]. PLANT AND SOIL,2025,N/A. |
| APA | Hao, Tianxiang.(2025).Long-term and short-term effects of nitrogen addition on soil acidification in a temperate steppe.PLANT AND SOIL,N/A. |
| MLA | Hao, Tianxiang."Long-term and short-term effects of nitrogen addition on soil acidification in a temperate steppe".PLANT AND SOIL N/A(2025). |
入库方式： OAI收割
来源：地理科学与资源研究所
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