Nutrient addition reduces carbon sequestration in a Tibetan grassland soil: Disentangling microbial and physical controls

Pang, Xueyong; Kuzyakov, Yakov; Liu, Deyan; Fan, Jianling; Luo, Junyu; Lindsey, Stuart; He, Jin‐Sheng; Ding, Weixin

doi:10.1016/j.soilbio.2020.107764

Cited by 109 publications

(86 citation statements)

References 98 publications

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“…Soil organisms regulate soil C storage and CO 2 efflux via their decomposition activities (Moore et al, 2015;Zhu et al, 2016;Luo et al, 2020). CO 2 efflux from the soil is altered by physiological and behavioral changes made by individual microbial populations (Hiscox et al, 2010;Crowther et al, 2011) and also by compositional changes in the microbial community (Crowther et al, 2015;Wu et al, 2019).…”

Section: G R a P H I C A L Abstractmentioning

confidence: 99%

Effects of soil organism interactions and temperature on carbon use efficiency in three different forest soils

Wang

Chen

et al. 2020

Soil Ecol. Lett.

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Section: G R a P H I C A L Abstractmentioning

confidence: 99%

Effects of soil organism interactions and temperature on carbon use efficiency in three different forest soils

Wang

Chen

et al. 2020

Soil Ecol. Lett.

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“…Nutrient supply, especially nitrogen (N) and phosphorus (P) availability, strongly affects C cycling and storage in grasslands ecosystems (Li et al, 2018; Luo et al, 2020; Ramirez, Craine, & Fierer, 2010; Riggs & Hobbie, 2016). N and P additions increase the aboveground plant biomass (Borer, Grace, Harpole, MacDougall, & Seabloom, 2017; Isbell et al, 2013; Li et al, 2014), and increase or decrease biomass allocation to roots (Fornara & Tilman, 2012; Li, Li, et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Mack et al (2004) showed that NP fertilization decreased SOC pools in Arctic tundra. N and P additions accelerated SOM decomposition and reduced SOC content in the topsoil of alpine meadows on the Tibetan Plateau (Li et al, 2018; Luo et al, 2019, 2020). The litter quality and various biomass allocations to aboveground plant and roots in different grassland ecosystems may result in varying soil C sequestration and SOC storage due to N and P additions (Fornara & Tilman, 2012; Li, Li, et al, 2018; Soudzilovskaia et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…N and P additions increase or decrease microbial biomass (Li, Hou, et al, 2018; Liu & Greaver, 2010; Ramirez, Craine, & Fierer, 2012), alter microbial activity and microbial C use efficiency (CUE) (Luo et al, 2020; Riggs & Hobbie, 2016), thus affecting soil C dynamics (Li, Hou, et al, 2018; Ramirez et al, 2012; Riggs et al, 2015). Microbial activity is driven by microbial demand for resources, with an average optimal C:N:P ratio of 60:7:1 for terrestrial ecosystems at the global level (Cleveland & Liptzin, 2007) and 48:5:1 for Tibetan alpine meadows (Chen et al, 2016; Zhao, Sun, Xu, & Qin, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies from alpine meadows on the Tibetan Plateau showed that input of N and P modified litter quality through increasing aboveground plant productivity and altering plants species' dominance in community, particularly the grass, Elymus nutans (Li et al, 2014; Li, Li, et al, 2018). These modifications can affect the availability of organic C and the decomposition of SOM, thus reducing SOC content (Li, Hou, et al, 2018; Li, Li, et al, 2018; Luo et al, 2019, 2020), with the lowest SOC content under P additions, as compared to N and NP additions (Li, Hou, et al, 2018). However, the mechanisms of this SOC decline induced by N and P additions are unclear.…”

Section: Introductionmentioning

confidence: 99%

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Effects of nitrogen and phosphorus additions on decomposition and accumulation of soil organic carbon in alpine meadows on the Tibetan Plateau

Zhang

Cheng

et al. 2020

Land Degrad Dev

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Nitrogen (N) and phosphorus (P) additions to grasslands increase aboveground plant biomass and modify plant community composition, thereby affecting plant‐derived organic carbon (C) input to soil and soil C cycling and storage. However, the effects of N and P additions on soil organic C (SOC) decomposition and sequestration are not fully understood and their underlying mechanisms are poorly known. This study aimed to explore the mechanisms underlying SOC decomposition and SOC content decline in the topsoil of alpine meadows on the Tibetan Plateau after 9‐years of field N and P additions. Stoichiometric characteristics of soil and microorganisms and their effects on microbial decomposition, including priming effects (PEs), C substrates decomposition, and microbial C use efficiency (CUE), were investigated by adding 13C labeled substrate (glucose or vanillin). Results showed that N and P additions differentially affected the magnitude and direction of PEs and SOC decomposition, accelerated mineralization of glucose and vanillin by 33–45% and 11–45%, respectively, but decreased microbial CUE of glucose and vanillin by 9–15% and 11–48%, respectively. These effects were caused by differential increase in microbial activity and acceleration of microbial decomposition due to N and P additions, and induced lower soil ecological stoichiometric ratios and higher microbial C:N:P ratios. The above effects led to different magnitudes of decomposition and accumulation of SOC and plant‐derived C substrate and thus decline in SOC content depending on N and P additions. We found that long‐term N and P additions would weaken soil functioning as a C pool for alpine meadows on the Tibetan Plateau.

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Nitrogen and phosphorus additions accelerate decomposition of slow carbon pool and lower total soil organic carbon pool in alpine meadows

Cheng

Zhang

et al. 2020

Land Degrad Dev

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Nitrogen (N) and phosphorus (P) additions reduced soil organic carbon (SOC) contents and stocks in alpine meadows on the Tibetan Plateau. However, little is known about microbial mechanisms behind SOC decline. This study investigated the effects of long‐term N and P additions on microbial community composition and SOC decomposition (C mineralization (Cm), mean resistant times for active C pool (MRTa), and slow C pool (MRTs) in alpine meadows. Results showed that the total SOC pool was reduced by 2–9% under N and P additions, of which slow C pool decreased by 3–10%, while active C pool increased by 4–75% compared to the Control. N and P additions shortened MRTs by 34–40% but prolonged MRTa by 30–62%. The relative abundance of four bacterial families was related to Cm or MRTa, while that of most of the fungal families affected SOC decomposition (including Cm, MRTa, and MRTs). N and P additions increased fungal diversity, differentially affected microbial community composition and structure through modifying microbial preference, and increasing the abundance of microbes which are capable of decomposing complex carbohydrate. Soil pH, available N, and total P were main factors determining microbial abundances. Microbial changes due to N and P additions accelerated decomposition of recalcitrant SOC, thus led to declines in slow C pool and total SOC pool but increases in active C pool. Therefore, long‐term N and P additions weaken soil functioning as C pool in alpine meadows.

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Nutrient addition reduces carbon sequestration in a Tibetan grassland soil: Disentangling microbial and physical controls

Cited by 109 publications

References 98 publications

Effects of soil organism interactions and temperature on carbon use efficiency in three different forest soils

Effects of soil organism interactions and temperature on carbon use efficiency in three different forest soils

Effects of nitrogen and phosphorus additions on decomposition and accumulation of soil organic carbon in alpine meadows on the Tibetan Plateau

Nitrogen and phosphorus additions accelerate decomposition of slow carbon pool and lower total soil organic carbon pool in alpine meadows

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