Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming

ABSTRACT Clipping (i.e., harvesting aboveground plant biomass) is common in agriculture and for bioenergy production. However, microbial responses to clipping in the context of climate warming are poorly understood. We investigated the interactive effects of grassland warming and clipping on soil pr...

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Autores principales:	Kai Xue, Mengting M. Yuan, Jianping Xie, Dejun Li, Yujia Qin, Lauren E. Hale, Liyou Wu, Ye Deng, Zhili He, Joy D. Van Nostrand, Yiqi Luo, James M. Tiedje, Jizhong Zhou
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2016
Materias:	Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/228586e7cd964d6f95b1ac4cefc56c7a
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spelling	oai:doaj.org-article:228586e7cd964d6f95b1ac4cefc56c7a2021-11-15T15:50:14ZAnnual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming10.1128/mBio.00976-162150-7511https://doaj.org/article/228586e7cd964d6f95b1ac4cefc56c7a2016-11-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mBio.00976-16https://doaj.org/toc/2150-7511ABSTRACT Clipping (i.e., harvesting aboveground plant biomass) is common in agriculture and for bioenergy production. However, microbial responses to clipping in the context of climate warming are poorly understood. We investigated the interactive effects of grassland warming and clipping on soil properties and plant and microbial communities, in particular, on microbial functional genes. Clipping alone did not change the plant biomass production, but warming and clipping combined increased the C4 peak biomass by 47% and belowground net primary production by 110%. Clipping alone and in combination with warming decreased the soil carbon input from litter by 81% and 75%, respectively. With less carbon input, the abundances of genes involved in degrading relatively recalcitrant carbon increased by 38% to 137% in response to either clipping or the combined treatment, which could weaken long-term soil carbon stability and trigger positive feedback with respect to warming. Clipping alone also increased the abundance of genes for nitrogen fixation, mineralization, and denitrification by 32% to 39%. Such potentially stimulated nitrogen fixation could help compensate for the 20% decline in soil ammonium levels caused by clipping alone and could contribute to unchanged plant biomass levels. Moreover, clipping tended to interact antagonistically with warming, especially with respect to effects on nitrogen cycling genes, demonstrating that single-factor studies cannot predict multifactorial changes. These results revealed that clipping alone or in combination with warming altered soil and plant properties as well as the abundance and structure of soil microbial functional genes. Aboveground biomass removal for biofuel production needs to be reconsidered, as the long-term soil carbon stability may be weakened. IMPORTANCE Global change involves simultaneous alterations, including those caused by climate warming and land management practices (e.g., clipping). Data on the interactive effects of warming and clipping on ecosystems remain elusive, particularly in microbial ecology. This study found that clipping alters microbial responses to warming and demonstrated the effects of antagonistic interactions between clipping and warming on microbial functional genes. Clipping alone or combined with warming enriched genes degrading relatively recalcitrant carbon, likely reflecting the decreased quantity of soil carbon input from litter, which could weaken long-term soil C stability and trigger positive warming feedback. These results have important implications in assessing and predicting the consequences of global climate change and indicate that the removal of aboveground biomass for biofuel production may need to be reconsidered.Kai XueMengting M. YuanJianping XieDejun LiYujia QinLauren E. HaleLiyou WuYe DengZhili HeJoy D. Van NostrandYiqi LuoJames M. TiedjeJizhong ZhouAmerican Society for MicrobiologyarticleMicrobiologyQR1-502ENmBio, Vol 7, Iss 5 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	Microbiology QR1-502
spellingShingle	Microbiology QR1-502 Kai Xue Mengting M. Yuan Jianping Xie Dejun Li Yujia Qin Lauren E. Hale Liyou Wu Ye Deng Zhili He Joy D. Van Nostrand Yiqi Luo James M. Tiedje Jizhong Zhou Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming
description	ABSTRACT Clipping (i.e., harvesting aboveground plant biomass) is common in agriculture and for bioenergy production. However, microbial responses to clipping in the context of climate warming are poorly understood. We investigated the interactive effects of grassland warming and clipping on soil properties and plant and microbial communities, in particular, on microbial functional genes. Clipping alone did not change the plant biomass production, but warming and clipping combined increased the C4 peak biomass by 47% and belowground net primary production by 110%. Clipping alone and in combination with warming decreased the soil carbon input from litter by 81% and 75%, respectively. With less carbon input, the abundances of genes involved in degrading relatively recalcitrant carbon increased by 38% to 137% in response to either clipping or the combined treatment, which could weaken long-term soil carbon stability and trigger positive feedback with respect to warming. Clipping alone also increased the abundance of genes for nitrogen fixation, mineralization, and denitrification by 32% to 39%. Such potentially stimulated nitrogen fixation could help compensate for the 20% decline in soil ammonium levels caused by clipping alone and could contribute to unchanged plant biomass levels. Moreover, clipping tended to interact antagonistically with warming, especially with respect to effects on nitrogen cycling genes, demonstrating that single-factor studies cannot predict multifactorial changes. These results revealed that clipping alone or in combination with warming altered soil and plant properties as well as the abundance and structure of soil microbial functional genes. Aboveground biomass removal for biofuel production needs to be reconsidered, as the long-term soil carbon stability may be weakened. IMPORTANCE Global change involves simultaneous alterations, including those caused by climate warming and land management practices (e.g., clipping). Data on the interactive effects of warming and clipping on ecosystems remain elusive, particularly in microbial ecology. This study found that clipping alters microbial responses to warming and demonstrated the effects of antagonistic interactions between clipping and warming on microbial functional genes. Clipping alone or combined with warming enriched genes degrading relatively recalcitrant carbon, likely reflecting the decreased quantity of soil carbon input from litter, which could weaken long-term soil C stability and trigger positive warming feedback. These results have important implications in assessing and predicting the consequences of global climate change and indicate that the removal of aboveground biomass for biofuel production may need to be reconsidered.
format	article
author	Kai Xue Mengting M. Yuan Jianping Xie Dejun Li Yujia Qin Lauren E. Hale Liyou Wu Ye Deng Zhili He Joy D. Van Nostrand Yiqi Luo James M. Tiedje Jizhong Zhou
author_facet	Kai Xue Mengting M. Yuan Jianping Xie Dejun Li Yujia Qin Lauren E. Hale Liyou Wu Ye Deng Zhili He Joy D. Van Nostrand Yiqi Luo James M. Tiedje Jizhong Zhou
author_sort	Kai Xue
title	Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming
title_short	Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming
title_full	Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming
title_fullStr	Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming
title_full_unstemmed	Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming
title_sort	annual removal of aboveground plant biomass alters soil microbial responses to warming
publisher	American Society for Microbiology
publishDate	2016
url	https://doaj.org/article/228586e7cd964d6f95b1ac4cefc56c7a
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Annual Removal of Aboveground Plant Biomass Alters Soil Microbial Responses to Warming

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