Land use intensification in a dry-hot valley reduced the constraints of water content on soil microbial diversity and multifunctionality but increased CO2 production
|Corresponding Author||Xu，Jianchu; Gui，Heng|
Conversion of abandoned land (mainly savanna) into cropland generally occurs in fragile ecosystems such as dry-hot valleys (DHVs) in southwest China, with the intent of increasing land productivity and conducting ecological restoration. However, the effects of conversion on soil microbial communities and carbon turnover of savanna ecosystems remain unclear, since savannas could be a vital but overlooked carbon sink. To illustrate the ecological consequences of land-use change (LUC) for savanna ecosystems, a 1-year field experiment was conducted in DHVs of southwest China. The soil properties, microbial respiration, and metagenomics from two different land-use types (grassland and mango plantation) were examined to reveal the effects of regional LUC on soil C turnover and microbial traits. Conversion from degraded grassland into cropland increased the contribution of soil microclimate to the microbial community composition, reduced the constraints of soil water content (SWC), and further decreased nutrient availability. LUC reshaped the composition and structure of soil bacterial communities. Specifically, soil dominant microbes that belonged to Actinobacteria and Proteobacteria were significantly enriched by conversion, while rare microbes that belonged to a wider range of phyla were generally depleted, leading to an overall decrease in community diversity. In addition, LUC-induced changes in soil characteristics and microbial communities further decreased soil multifunctionality as well as the carbon use efficiency of microbes. Intensified microbial respiration and a significant increase in the soil CO efflux were observed following LUC, which could drive changes in soil microbial community composition and functions (such as growth and regeneration). In summary, through simultaneously reducing constraints on SWC and decreasing nutrient availability, conversion from degraded grassland to cropland in a DHV decreased soil microbial diversity and multifunctionality, and increased microbial respiration and soil CO efflux. Our study provides new insights for understanding the role and mechanisms of LUC in soil carbon turnover in ecologically fragile areas such as DHVs.
Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China
|WOS Research Area|
Environmental Sciences & Ecology
|WOS Accession No|
|EI Accession Number|
Bacteria ; Carbon ; Ecosystems ; Land Use ; Nutrients ; Soil Moisture
|ESI Classification Code|
Urban And Regional Planning And Development:403 ; Ecology And Ecosystems:454.3 ; Soils And Soil Mechanics:483.1 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2
|ESI Research Field|
Cited Times [WOS]:2
|Document Type||Journal Article|
|Department||SUSTech-Peking University National Institute of Plants and Food|
1.Department of Economic Plants and Biotechnology,Yunnan Key Laboratory for Wild Plant Resources,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming,650201,China
2.Centre for Mountain Futures (CMF),Kunming Institute of Botany,Chinese Academy of Sciences,Kunming,650201,China
3.Institute of Plant and Food Science,Department of Biology,School of Life Sciences,Southern University of Science and Technology,Shenzhen,518055,China
4.University of Chinese Academy of Sciences,Beijing,100049,China
5.State Key Laboratory of Grassland Agro-Ecosystems,Institute of Innovation Ecology,Lanzhou University,Lanzhou,730000,China
6.CAS Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla,Yunnan,666303,China
7.World Agroforestry Centre (ICRAF),Nairobi,United Nations Avenue, Gigiri, P.O. Box 30677-00100,Kenya
|First Author Affilication||SUSTech-Peking University National Institute of Plants and Food; Department of Biology; School of Life Sciences|
Wang，Zhenghong,Liu，Xiang,Zhou，Wenjun,et al. Land use intensification in a dry-hot valley reduced the constraints of water content on soil microbial diversity and multifunctionality but increased CO2 production[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,852.
Wang，Zhenghong.,Liu，Xiang.,Zhou，Wenjun.,Sinclair，Fergus.,Shi，Lingling.,...&Gui，Heng.(2022).Land use intensification in a dry-hot valley reduced the constraints of water content on soil microbial diversity and multifunctionality but increased CO2 production.SCIENCE OF THE TOTAL ENVIRONMENT,852.
Wang，Zhenghong,et al."Land use intensification in a dry-hot valley reduced the constraints of water content on soil microbial diversity and multifunctionality but increased CO2 production".SCIENCE OF THE TOTAL ENVIRONMENT 852(2022).
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