Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory
文献类型：期刊论文
| 作者 | Li, Dandan3,4; Zhang, Xinyu1,4; Dungait, Jennifer A. J.2; Green, Sophie M.2; Wen, Xuefa1,4; Quine, Timothy A.2; Wang, Qiubing3 |
| 刊名 | AGRICULTURE ECOSYSTEMS & ENVIRONMENT
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 308页码:9 |
| 关键词 | Karst Critical Zone Observatory Cropland revegetation Nitrifier and denitrifier abundances Potential denitrification rates Basal denitrification rates Phosphorus |
| ISSN号 | 0167-8809 |
| DOI | 10.1016/j.agee.2020.107228 |
| 通讯作者 | Zhang, Xinyu(zhangxy@igsnrr.ac.cn) |
| 英文摘要 | The revegetation of karst ecosystems in subtropical southwest China that became severely degraded because of intensive agriculture relies on the persistence and recovery of soil functions such as nutrient cycling. Denitrification is a nitrogen (N) removal process that is carried out by nitrifying and denitrifying microorganisms. We still do not have a comprehensive understanding of denitrification and what drives it during revegetation of cropland in degraded karst ecosystems. We used the space-for-time chmnosequence method to establish a restoration gradient (sloping cropland, abandoned sloping cropland, and secondary and primary forest) within the Karst Critical Zone Observatory in southwest China. We quantified the abundances of the nitrifier and denitrifier microbial communities and measured the potential denitrification rates (PDR) and basal denitrification rates (BDR) in incubated soils to investigate the denitrification activity in soils at different stages of restoration. The PDR increased through the cropland revegetation phases, and the BDR was lowest in the abandoned sloping cropland (p < 0.05). Both the PDR and BDR were positively correlated with the denitrifier abundances (i.e., nitrite reductase, nirK, and nirS), but were negatively correlated with nitrifier abundances (i.e., ammonia oxidation, AOA, and AOB). The BDR/PDR ratio was 84 % in the sloping cropland but was only 1% in the primary forest, which suggests that the N cycling was inefficient ('leaky') in actively managed farmland soils but was 'tight' in forest soils. The AOB and nirS abundances explained most of the PDR in the sloping cropland and abandoned sloping cropland, while the soil phosphorus (P) contents explained most of the variation in BDR and PDR in land that was forested in later phases of revegetation. Progressive increases in the PDR as the revegetation progressed was directly controlled by the soil available P and total P contents. Available P was also associated with increases in the carbon (C) and N contents, which influenced the BDR indirectly through increased abundances of nirK and nirS. We conclude that revegetation of cropland helped to facilitate 'tight' N-cycling in poor karst soils, and we suggest that judicious P fertilization on sloping cropland would reduce the denitrification activity in degraded ecosystems. |
| WOS关键词 | NITROUS-OXIDE EMISSIONS ; POTENTIAL DENITRIFICATION ; N2O EMISSIONS ; VEGETATION RECOVERY ; CARBON STOCK ; LAND-USES ; ABUNDANCE ; FOREST ; GENES ; SUCCESSION |
| 资助项目 | National Key Research and Development Program of China[2016YFC0500102] ; Science Centre Project of National Natural Science Foundation of China[31988102] ; National Natural Science Foundation of China[41877091] ; National Natural Science Foundation of China[41830860] ; National Natural Science Foundation of China[41571130043] ; National Environmental Research Council of the UK[NE/N007603/1] |
| WOS研究方向 | Agriculture ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000604619500002 |
| 出版者 | ELSEVIER |
| 资助机构 | National Key Research and Development Program of China ; Science Centre Project of National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Environmental Research Council of the UK |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/136805]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhang, Xinyu |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 2.Univ Exeter, Coll Life & Environm Sci, Dept Geog, Exeter EX4 4RJ, Devon, England 3.Shenyang Agr Univ, Coll Land & Environm, Shenyang 110866, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Dandan,Zhang, Xinyu,Dungait, Jennifer A. J.,et al. Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2021,308:9. |
| APA | Li, Dandan.,Zhang, Xinyu.,Dungait, Jennifer A. J..,Green, Sophie M..,Wen, Xuefa.,...&Wang, Qiubing.(2021).Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,308,9. |
| MLA | Li, Dandan,et al."Main controls on the denitrification rates during cropland revegetation in the southwest China Karst Critical Zone Observatory".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 308(2021):9. |
入库方式： OAI收割
来源：地理科学与资源研究所
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