Changes in nitrogen functional genes in soil profiles of grassland under long-term grazing prohibition in a semiarid area
文献类型：期刊论文
| 作者 | Song, Zilin1,2; Wang, Jie1 ; Liu, Guobin1,3; Zhang, Chao1
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2019-07-10 |
| 卷号 | 673页码:92-101 |
| ISSN号 | 0048-9697 |
| 关键词 | Grazing prohibition Nitrogen functional genes Soil profile Semiarid grassland |
| DOI | 10.1016/j.scitotenv.2019.04.026 |
| 通讯作者 | Zhang, Chao(zhangchaolynn@163.com) |
| 英文摘要 | Grazing prohibition has been used to restore degraded grassland ecosystems in semiarid areas; however, the impact of this measure on soil nitrogen (N) cycling is poorly understood. Furthermore, recent studies have tended to focus on the topsoil and ignored a steep gradient of nutrient accumulation with soil depth. Here, we investigated changes in N functional genes (NFGs) involved in organic N decomposition (chiA), archaeal and bacterial ammonia oxidation (amoA-AOA and amoA-AOB), respectively, denitrification (nirK and nirS), and N fixation (nifH) in soil profiles from a chronosequence of grazing prohibition (0, 10, 15, 25, and 35 years) in the semiarid grasslands of the Loess Plateau, China. The abundance of all the investigated NFGs in grassland soils after 35 years' grazing prohibition was higher than in grazed grassland. This result suggests that microbial N turnover potential is facilitated by grazing prohibition, probably through enhanced biomass production via increases in nutrient input into the soil. The higher ratio of (chiA + nifH)/(amoA-AOA + amoA-AOB) and values of (nirK + nirS) in grazing-prohibited grasslands than in grazed grassland suggest that prohibition of grazing not only improved microbial N storage potential but also increased N gas emission potential. The abundances of NFGs varied along the soil profiles and responded differently to environmental factors. The chiA and nifH abundances decreased with soil depth and were associated with variation in aboveground biomass, NH4+-N, and organic carbon, while amoA-AOA, nirK, and nirS genes increased with depth and were more affected by soil organic carbon, moisture, and bulk density. Multivariate regression tree analysis demonstrated that aboveground biomass was the best explanatory variable for the changes in NFGs in grazed grassland, while soil organic carbon was the best in the grazing-prohibited grasslands. Our results provide new insight into the soil N cycling potential of degraded and restored semiarid grassland ecosystems. (C) 2019 Elsevier B.V. All rights reserved. |
| WOS关键词 | PLANT DIVERSITY ; VERTICAL-DISTRIBUTION ; COMMUNITY STRUCTURE ; MICROBIAL BIOMASS ; OXIDE EMISSIONS ; INNER-MONGOLIA ; TYPICAL STEPPE ; LOESS PLATEAU ; EXCLUSION ; VEGETATION |
| 资助项目 | National Natural Science Foundation of China[41771554] ; National Key Research and Development Program of China[2016YFC0501707] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000466418300011 |
| 资助机构 | National Natural Science Foundation of China ; National Key Research and Development Program of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/59411]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhang, Chao |
| 作者单位 | 1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, Zilin,Wang, Jie,Liu, Guobin,et al. Changes in nitrogen functional genes in soil profiles of grassland under long-term grazing prohibition in a semiarid area[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,673:92-101. |
| APA | Song, Zilin,Wang, Jie,Liu, Guobin,&Zhang, Chao.(2019).Changes in nitrogen functional genes in soil profiles of grassland under long-term grazing prohibition in a semiarid area.SCIENCE OF THE TOTAL ENVIRONMENT,673,92-101. |
| MLA | Song, Zilin,et al."Changes in nitrogen functional genes in soil profiles of grassland under long-term grazing prohibition in a semiarid area".SCIENCE OF THE TOTAL ENVIRONMENT 673(2019):92-101. |
入库方式： OAI收割
来源：地理科学与资源研究所
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