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Huang J, Xu Y, Yu H, Zhu W, Wang P, Wang B, Na X. Soil prokaryotic community shows no response to 2 years of simulated nitrogen deposition in an arid ecosystem in northwestern China. Environ Microbiol 2020; 23:1222-1237. [PMID: 33346392 DOI: 10.1111/1462-2920.15364] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 12/15/2020] [Indexed: 11/30/2022]
Abstract
An arid ecosystem might be sensitive to nitrogen (N) deposition, but the associated ecosystem-specific response of soil microbes is not well studied. To assess the N enrichment effects on plant and prokaryotic community diversity, we performed a two-year NH4 NO3 treatment in a desert steppe in northwestern China. Results showed that N addition increased plant aboveground biomass and decreased plant Shannon diversity. A C4 herb (Salsola collina) became dominant, and loss of legume species was observed. The concentrations of soil NH4 + -N, NO3 - -N, microbial biomass N, and the plant aboveground biomass N pool increased in contrast to total N, suggesting that the N input into the arid ecosystem might mainly be assimilated by plants and exit the ecosystem. Remarkably, the α-diversity and structure of the soil prokaryotic community did not vary even at the highest N addition rate. Structural equation modelling further found that the plant aboveground N pool counteracted the acidification effect of N deposition and maintained soil pH thus partially stabilizing the composition of prokaryotic communities in a desert steppe. These findings suggested that the plants and N loss might contribute to the lack of responsiveness of soil prokaryotic community to N deposition in a desert steppe.
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Affiliation(s)
- Juying Huang
- Institute of Environmental Engineering, Ningxia University, Yinchuan, China
| | - Yixin Xu
- Institute of Environmental Engineering, Ningxia University, Yinchuan, China.,College of Resources and Environment, Ningxia University, Yinchuan, China
| | - Hailong Yu
- College of Resources and Environment, Ningxia University, Yinchuan, China
| | - Wanwan Zhu
- Institute of Environmental Engineering, Ningxia University, Yinchuan, China.,College of Resources and Environment, Ningxia University, Yinchuan, China
| | - Pan Wang
- Institute of Environmental Engineering, Ningxia University, Yinchuan, China.,College of Resources and Environment, Ningxia University, Yinchuan, China
| | - Bin Wang
- Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, China
| | - Xiaofan Na
- School of Life Science, Lanzhou University, Lanzhou, China
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Shrubland primary production and soil respiration diverge along European climate gradient. Sci Rep 2017; 7:43952. [PMID: 28256623 PMCID: PMC5335567 DOI: 10.1038/srep43952] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 02/01/2017] [Indexed: 11/08/2022] Open
Abstract
Above- and belowground carbon (C) stores of terrestrial ecosystems are vulnerable to environmental change. Ecosystem C balances in response to environmental changes have been quantified at individual sites, but the magnitudes and directions of these responses along environmental gradients remain uncertain. Here we show the responses of ecosystem C to 8–12 years of experimental drought and night-time warming across an aridity gradient spanning seven European shrublands using indices of C assimilation (aboveground net primary production: aNPP) and soil C efflux (soil respiration: Rs). The changes of aNPP and Rs in response to drought indicated that wet systems had an overall risk of increased loss of C but drier systems did not. Warming had no consistent effect on aNPP across the climate gradient, but suppressed Rs more at the drier sites. Our findings suggest that above- and belowground C fluxes can decouple, and provide no evidence of acclimation to environmental change at a decadal timescale. aNPP and Rs especially differed in their sensitivity to drought and warming, with belowground processes being more sensitive to environmental change.
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Drought and Carbon Cycling of Grassland Ecosystems under Global Change: A Review. WATER 2016. [DOI: 10.3390/w8100460] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Fourteen Annually Repeated Droughts Suppressed Autotrophic Soil Respiration and Resulted in an Ecosystem Change. Ecosystems 2013. [DOI: 10.1007/s10021-013-9720-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kong D, Xia Q, Liu G, Huang Q, Lu J. Covalent bonding of chloroanilines to humic constituents: pathways, kinetics, and stability. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2013; 180:48-54. [PMID: 23727567 DOI: 10.1016/j.envpol.2013.05.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 05/04/2013] [Accepted: 05/06/2013] [Indexed: 06/02/2023]
Abstract
Covalent coupling to natural humic constituents comprises an important transformation pathway for anilinic pollutants in the environment. We systematically investigated the reactions of chlorine substituted anilines with catechol and syringic acid in horseradish peroxidase (HRP) catalyzed systems. It was demonstrated that although nucleophilic addition was the mechanism of covalent bonding to both catechol and syringic acid, chloroanilines coupled to the 2 humic constituents via slightly different pathways. 1,4-addition and 1,2-addition are involved to catechol and syringic acid, respectively. 1,4-addition showed empirical 2nd order kinetics and this pathway seemed to be more permanent than 1,2-addition. Stability experiments demonstrated that cross-coupling products with syringic acid could be easily released in acidic conditions. However, cross-coupling with catechol was relatively stable at similar conditions. Thus, the environmental behavior and bioavailability of the coupling products should be carefully assessed.
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Affiliation(s)
- Deyang Kong
- Department of Environmental Science and Engineering, Nanjing Agricultural University, Nanjing 210095, China
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