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Changes in the biological N2-fixation rates and diazotrophic community as vegetation recovers on abandoned farmland in a karst region of China
Applied Soil Ecology ( IF 4.8 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.apsoil.2020.103808 Dandan Li , Xinyu Zhang , Jennifer A.J. Dungait , Xuefa Wen , Timothy A. Quine , Qiubing Wang
Applied Soil Ecology ( IF 4.8 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.apsoil.2020.103808 Dandan Li , Xinyu Zhang , Jennifer A.J. Dungait , Xuefa Wen , Timothy A. Quine , Qiubing Wang
Abstract 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
更新日期：2021-02-01
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