Changes in the biological N-2-fixation rates and diazotrophic community as vegetation recovers on abandoned farmland in a karst region of China

doi:10.1016/j.apsoil.2020.103808

	Changes in the biological N-2-fixation rates and diazotrophic community as vegetation recovers on abandoned farmland in a karst region of China
	Li, Dandan 2,3; Zhang, Xinyu 2,4; Dungait, Jennifer A. J.1; Wen, Xuefa 2,4; Quine, Timothy A.1; Wang, Qiubing 3
刊名	APPLIED SOIL ECOLOGY
	2021-02-01
卷号	158 页码:8
关键词	Karst critical zone observatory Diazotrophic community nifH gene Biological nitrogen fixation Soil physicochemical properties
ISSN号	0929-1393
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.
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关键词	NITROGEN-FIXATION ; SUBTROPICAL KARST ; N-2 FIXATION ; SOIL ; DIVERSITY ; CARBON ; ABUNDANCE ; PLANTS ; SUCCESSION ; STRATEGIES
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
内容类型	期刊论文
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.Univ Exeter, Coll Life & Environm Sci, Dept Geog, Rennes Dr, Exeter EX4 4RJ, Devon, England 2.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 3.Shenyang Agr Univ, Coll Land & Environm, Shenyang 110866, Peoples R China 4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, 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.