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Reclamation of desert land to different land‐use types changes soil bacterial community composition in a desert‐oasis ecotone
Land Degradation & Development ( IF 4.7 ) Pub Date : 2020-10-25 , DOI: 10.1002/ldr.3803
Jinbiao Li 1, 2 , Prem Pokharel 3 , Guangming Liu 2 , Jinlin Chen 1
Affiliation  

Understanding the impacts of different land‐uses on soil microbial communities is essential for maintaining soil health and sustainability in a desert‐oasis ecotone. Information on the microbial community composition of reclaimed soils under different land‐use types after several decades of reclamation are limited. The objective of this study was to investigate the impacts of reclamation of the non‐productive desert to productive lands on soil microbial community composition and identify the critical soil chemical factors associated with these changes. Soil samples were collected from a control (natural desert land [DL]) and reclaimed lands: cotton land (CL), grape land (vinyards) (GL), and shelterbelt (SL). Soil microbial community composition and diversity were determined by high throughput sequencing. The results showed that soil organic carbon (SOC), total nitrogen (N), phosphorus (P), potassium (K), and pH were significantly different between DL and reclaimed soils (CL, GL, and SL). Sixty years after reclamation, the CL contained a higher relative abundance of Actinobacteria, while the GL and SL contained a higher relative abundance of Acidobacteria. There were 541 operational taxonomic units (OTUs) shared by all the four land‐use types. The highest number of shared OTUs was found in the GL and SL. The variance observed in the bacterial communities in all land‐use types were mainly explained by SOC, followed by total N, total K, pH, and total P. Our results suggest that land‐use type change has significant impacts on soil bacterial community composition and diversity through modifications in soil chemical properties in desert‐oasis ecotone.

中文翻译:

将荒地开垦为不同的土地利用类型会改变荒漠绿洲交错带中的土壤细菌群落组成

了解不同土地利用对土壤微生物群落的影响对于维持荒漠绿洲过渡带的土壤健康和可持续性至关重要。在开垦几十年后,有关不同土地利用类型下的复垦土壤微生物群落组成的信息有限。这项研究的目的是调查将非生产性沙漠复垦为生产性土地对土壤微生物群落组成的影响,并确定与这些变化相关的关键土壤化学因子。从对照(天然沙漠土地[DL])和开垦土地中收集土壤样品:棉花土地(CL),葡萄土地(葡萄园)(GL)和防护林(SL)。通过高通量测序确定土壤微生物群落组成和多样性。结果表明,DL和再生土壤(CL,GL和SL)的土壤有机碳(SOC),总氮(N),磷(P),钾(K)和pH值显着不同。填海六十年后,CL的相对丰度较高放线菌,而GL和SL含有较高的酸性相对丰度。四种土地利用类型共有541个操作生物分类单位(OTU)。在GL和SL中发现了最大数量的共享OTU。在所有土地利用类型中,细菌群落中观察到的差异主要由SOC解释,然后是总氮,总钾,pH和总磷。我们的结果表明,土地利用类型的变化对土壤细菌群落组成有重大影响通过改变荒漠绿洲过渡带的土壤化学特性来实现多样性和多样性。
更新日期:2020-10-25
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