Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands

Fertilization in agricultural peatlands accelerates nutrient cycling and creates a potential risk to nearby natural peatlands. Here, using undisturbed peatlands as reference, we studied soil carbon (C), nitrogen (N), phosphorus (P) and the key enzymes for nutrient cycling at 0–50 cm soil depth in ag...

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Autores principales:	Lei Qin, Chris Freeman, Xueying Jia, Zhongsheng Zhang, Bo Liu, Shaoqing Zhang, Ming Jiang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Fertilization Peatlands Management Phosphorus Nitrogen Enzyme activity Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/4f9abd12fd83496b83167ce9c63319cb
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spelling	oai:doaj.org-article:4f9abd12fd83496b83167ce9c63319cb2021-12-01T04:40:09ZMicrobial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands1470-160X10.1016/j.ecolind.2020.107242https://doaj.org/article/4f9abd12fd83496b83167ce9c63319cb2021-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X2031181Xhttps://doaj.org/toc/1470-160XFertilization in agricultural peatlands accelerates nutrient cycling and creates a potential risk to nearby natural peatlands. Here, using undisturbed peatlands as reference, we studied soil carbon (C), nitrogen (N), phosphorus (P) and the key enzymes for nutrient cycling at 0–50 cm soil depth in agricultural, nearby disturbed peatlands in a temperate fen in Northeast China. Agricultural intervention significantly increased total P in agricultural and disturbed peatlands, and decreased soil organic carbon content and total N in surface soil of agricultural peatlands, however total N significantly accumulated at 20–30 cm soil both in agricultural and disturbed peatlands (p < 0.05). Both N-acetyl-β-glucosaminidase and phosphatase significantly declined in agricultural peatlands, while only phosphatase decreased in disturbed peatlands (p < 0.05), and linear regression models showed strong effects of changes of soil nutrient levels on enzyme activities. The ratios of β-D-glucosidase to N-acetyl-β-glucosaminidase and phosphatase markedly increased in agricultural peatlands and showed higher ratios in deeper soil of disturbed peatlands, suggesting relatively higher microbial demand for carbon. Nonmetric multidimensional scaling analysis showed that variations of enzyme activity and stoichiometry can be used to reveal agricultural disturbance, and further redundancy analysis identified that total P and SOC explained 38.3% and 8.3% of the variance. Overall, our findings show that microbial enzymatic activity and stoichiometry can be effective and sensitive indicators of agricultural intervention and nutrient changes in peatlands, which implies that they can be used in monitoring of future fertilization management strategies aimed at fostering more sustainable agriculture.Lei QinChris FreemanXueying JiaZhongsheng ZhangBo LiuShaoqing ZhangMing JiangElsevierarticleFertilizationPeatlandsManagementPhosphorusNitrogenEnzyme activityEcologyQH540-549.5ENEcological Indicators, Vol 122, Iss , Pp 107242- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Fertilization Peatlands Management Phosphorus Nitrogen Enzyme activity Ecology QH540-549.5
spellingShingle	Fertilization Peatlands Management Phosphorus Nitrogen Enzyme activity Ecology QH540-549.5 Lei Qin Chris Freeman Xueying Jia Zhongsheng Zhang Bo Liu Shaoqing Zhang Ming Jiang Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands
description	Fertilization in agricultural peatlands accelerates nutrient cycling and creates a potential risk to nearby natural peatlands. Here, using undisturbed peatlands as reference, we studied soil carbon (C), nitrogen (N), phosphorus (P) and the key enzymes for nutrient cycling at 0–50 cm soil depth in agricultural, nearby disturbed peatlands in a temperate fen in Northeast China. Agricultural intervention significantly increased total P in agricultural and disturbed peatlands, and decreased soil organic carbon content and total N in surface soil of agricultural peatlands, however total N significantly accumulated at 20–30 cm soil both in agricultural and disturbed peatlands (p < 0.05). Both N-acetyl-β-glucosaminidase and phosphatase significantly declined in agricultural peatlands, while only phosphatase decreased in disturbed peatlands (p < 0.05), and linear regression models showed strong effects of changes of soil nutrient levels on enzyme activities. The ratios of β-D-glucosidase to N-acetyl-β-glucosaminidase and phosphatase markedly increased in agricultural peatlands and showed higher ratios in deeper soil of disturbed peatlands, suggesting relatively higher microbial demand for carbon. Nonmetric multidimensional scaling analysis showed that variations of enzyme activity and stoichiometry can be used to reveal agricultural disturbance, and further redundancy analysis identified that total P and SOC explained 38.3% and 8.3% of the variance. Overall, our findings show that microbial enzymatic activity and stoichiometry can be effective and sensitive indicators of agricultural intervention and nutrient changes in peatlands, which implies that they can be used in monitoring of future fertilization management strategies aimed at fostering more sustainable agriculture.
format	article
author	Lei Qin Chris Freeman Xueying Jia Zhongsheng Zhang Bo Liu Shaoqing Zhang Ming Jiang
author_facet	Lei Qin Chris Freeman Xueying Jia Zhongsheng Zhang Bo Liu Shaoqing Zhang Ming Jiang
author_sort	Lei Qin
title	Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands
title_short	Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands
title_full	Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands
title_fullStr	Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands
title_full_unstemmed	Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands
title_sort	microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/4f9abd12fd83496b83167ce9c63319cb
work_keys_str_mv	AT leiqin microbialenzymeactivityandstoichiometrysignaltheeffectsofagriculturalinterventiononnutrientcyclinginpeatlands AT chrisfreeman microbialenzymeactivityandstoichiometrysignaltheeffectsofagriculturalinterventiononnutrientcyclinginpeatlands AT xueyingjia microbialenzymeactivityandstoichiometrysignaltheeffectsofagriculturalinterventiononnutrientcyclinginpeatlands AT zhongshengzhang microbialenzymeactivityandstoichiometrysignaltheeffectsofagriculturalinterventiononnutrientcyclinginpeatlands AT boliu microbialenzymeactivityandstoichiometrysignaltheeffectsofagriculturalinterventiononnutrientcyclinginpeatlands AT shaoqingzhang microbialenzymeactivityandstoichiometrysignaltheeffectsofagriculturalinterventiononnutrientcyclinginpeatlands AT mingjiang microbialenzymeactivityandstoichiometrysignaltheeffectsofagriculturalinterventiononnutrientcyclinginpeatlands
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Microbial enzyme activity and stoichiometry signal the effects of agricultural intervention on nutrient cycling in peatlands

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