Changes in the biological N-2-fixation rates and diazotrophic community as vegetation recovers on abandoned farmland in a karst region of China
文献类型：期刊论文
| 作者 | Li, Dandan1,4; Zhang, Xinyu3,4; Dungait, Jennifer A. J.2; Wen, Xuefa3,4; Quine, Timothy A.2; Wang, Qiubing1 |
| 刊名 | APPLIED SOIL ECOLOGY
 |
| 出版日期 | 2021-02-01 |
| 卷号 | 158页码:8 |
| ISSN号 | 0929-1393 |
| 关键词 | Karst critical zone observatory Diazotrophic community nifH gene Biological nitrogen fixation Soil physicochemical properties |
| DOI | 10.1016/j.apsoil.2020.103808 |
| 通讯作者 | Zhang, Xinyu(zhangxy@igsnrr.ac.cn) ; Wang, Qiubing(qiubingwangsy@163.com) |
| 英文摘要 | The successful regeneration of karst landscapes that have been severely degraded by intensive agriculture relies on the recovery of biological nitrogen fixation (BNF) by diazotrophic communities in soils after nitrogen (N) derived from synthetic fertilizers dissipates through the soil. It is important to understand the mechanisms that drive BNF because there must be enough bioavailable N in soils to support the recovery of native vegetation communities that are best adapted to erosion-prone karst landscapes. In this study, we quantified the response of the diazotrophic population in topsoil (0-10 cm deep) along a vegetation restoration gradient (sloping cropland abandoned sloping cropland > secondary forest > primary forest) in the Puding Karst Critical Zone Observatory, Guizhou Province, southwest China from the absolute and specific BNF rates, determined using the acetylene reduction method and qPCR and MiSeq sequencing of nifH genes. The nifH phylogenetic diversities increased as the vegetation increased in maturity and were positively correlated with soil moisture and the N to phosphorus ratio (p < 0.05). The diazotrophic community structure changed with the vegetation recovery time (p < 0.05). Rhizobiales accounted for between 38% and 45% of the total nifH gene sequences and were the most abundant order in the vegetation that had been recovering for the longest time. We found that the soil bulk density was a strong control on the diazotroph community structure and was negatively correlated with Rhizobiales. The absolute and specific BNF rates were the highest in primary forest and abandoned sloping cropland, respectively (p < 0.05). The results from stepwise multiple regression showed that 50% of the variation in the absolute BNF rates was explained by SWC, and 55% of the variation in the nifH specific rates was explained by the available N contents and the diazotrophic community structure. We suggest that the recovery of degraded karst could be accelerated by managing the soil physical structure so that the environment is suitable for diazotrophic communities, which would then improve the BNF efficiency. |
| WOS关键词 | NITROGEN-FIXATION ; SUBTROPICAL KARST ; N-2 FIXATION ; SOIL ; DIVERSITY ; CARBON ; ABUNDANCE ; PLANTS ; SUCCESSION ; STRATEGIES |
| 资助项目 | National Key Research and Development Program of China[2016YFC0500102] ; Science Centre project of National Natural Science Foundation of China[31988102] ; State Key Programs of National Natural Science Foundation of China[41571130043] ; National Environmental Research Council of the UK[NE/N007603/1] |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000596642000005 |
| 资助机构 | National Key Research and Development Program of China ; Science Centre project of National Natural Science Foundation of China ; State Key Programs of National Natural Science Foundation of China ; National Environmental Research Council of the UK |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/137721]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhang, Xinyu; Wang, Qiubing |
| 作者单位 | 1.Shenyang Agr Univ, Coll Land & Environm, Shenyang 110866, Peoples R China 2.Univ Exeter, Coll Life & Environm Sci, Dept Geog, Rennes Dr, Exeter EX4 4RJ, Devon, England 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 4.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 | Li, Dandan,Zhang, Xinyu,Dungait, Jennifer A. J.,et al. Changes in the biological N-2-fixation rates and diazotrophic community as vegetation recovers on abandoned farmland in a karst region of China[J]. APPLIED SOIL ECOLOGY,2021,158:8. |
| APA | Li, Dandan,Zhang, Xinyu,Dungait, Jennifer A. J.,Wen, Xuefa,Quine, Timothy A.,&Wang, Qiubing.(2021).Changes in the biological N-2-fixation rates and diazotrophic community as vegetation recovers on abandoned farmland in a karst region of China.APPLIED SOIL ECOLOGY,158,8. |
| MLA | Li, Dandan,et al."Changes in the biological N-2-fixation rates and diazotrophic community as vegetation recovers on abandoned farmland in a karst region of China".APPLIED SOIL ECOLOGY 158(2021):8. |
入库方式： OAI收割
来源：地理科学与资源研究所
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