Impacts of nitrogen addition on the carbon balance in a temperate semiarid grassland ecosystem

Luo, Qinpu; Gong, Jirui; Yang, Lili; Li, Xiaobing; Yan, Ping; Liu, Min; Zhai, Zhanwei; Baoyin, Taogetao

doi:10.1007/s00374-017-1233-x

Cited by 25 publications

(10 citation statements)

References 88 publications

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“…NEE and GEP were significantly increased by N addition in our study, which is consistent with results from a typical steppe and a meadow steppe in northern China . Nitrogen is one of the most limiting nutrients in grasslands . In this study, N addition increased soil available N content, total aboveground biomass, as well as NEE under both ambient and warming conditions (Figures , , and S2).…”

Section: Discussionsupporting

confidence: 91%

“…11 Nitrogen is one of the most limiting nutrients in grasslands. 41 In this study, N addition increased soil available N content, total aboveground biomass, as well as NEE under both ambient and warming conditions (Figures 2, 3, and S2). Increased soil N availability promotes plant photosynthesis and growth, especially in soils with a limited N supply, thereby enhancing NEE.…”

Section: ■ Discussionmentioning

confidence: 50%

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Long-Term Warming and Nitrogen Addition Have Contrasting Effects on Ecosystem Carbon Exchange in a Desert Steppe

Ren

Ton

et al. 2021

Environ. Sci. Technol.

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Desert steppe, a unique ecotone between steppe and desert in Eurasia, is considered highly vulnerable to global change. However, the long-term impact of warming and nitrogen deposition on plant biomass production and ecosystem carbon exchange in a desert steppe remains unknown. A 12-year field experiment was conducted in a Stipa breviflora desert steppe in northern China. A split-design was used, with warming simulated by infrared radiators as the primary factor and N addition as the secondary factor. Our long-term experiment shows that warming did not change net ecosystem exchange (NEE) or total aboveground biomass (TAB) due to contrasting effects on C4 (23.4% increase) and C3 (11.4% decrease) plant biomass. However, nitrogen addition increased TAB by 9.3% and NEE by 26.0% by increasing soil available N content. Thus, the studied desert steppe did not switch from a carbon sink to a carbon source in response to global change and positively responded to nitrogen deposition. Our study indicates that the desert steppe may be resilient to long-term warming by regulating plant species with contrasting photosynthetic types and that nitrogen deposition could increase plant growth and carbon sequestration, providing negative feedback on climate change.

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Section: Discussionsupporting

confidence: 91%

Section: ■ Discussionmentioning

confidence: 50%

Long-Term Warming and Nitrogen Addition Have Contrasting Effects on Ecosystem Carbon Exchange in a Desert Steppe

Ren

Ton

et al. 2021

Environ. Sci. Technol.

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“…Despite the fact that the root exclusion method used in our study has been used in numerous studies previously (Chen et al, ; Luo et al, ), there are some uncertainties associated with this procedure. First, dead root decomposition cannot be entirely eliminated even though root exclusion was carried out several months before the first measurements of HR.…”

Section: Discussionmentioning

confidence: 99%

Contrasting responses after fires of the source components of soil respiration and ecosystem respiration

Chen

Zhang

Luo

et al. 2019

European J Soil Science

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Wildfire is an important ecological disturbance that can have cascading effects on ecosystem carbon (C) fluxes. Ecosystem respiration (ER) and soil respiration (SR) account for two of the largest terrestrial C fluxes to the atmosphere, and they play critical roles in regulating C–climate feedbacks. Here, the responses of ER, SR and their source components to experimental burning in a meadow grassland on the Tibetan Plateau were investigated. Fire treatment increased ER by 9% but decreased SR by 15%. The contrasting post‐fire responses of SR and ER can be explained by the behaviour of their source components; that is, fire increased aboveground plant respiration (Ragb) by 37%, but decreased heterotrophic respiration (HR) by 21%. Increases in ER and Ragb were mainly related to enhanced plant productivity, whereas smaller SR and HR were associated with reductions in microbial biomass and soil moisture. Accounting for the responses of ER, SR and their intrinsic components has advanced our understanding of how fire affects ecosystem C fluxes. Highlights Fire treatment increased ecosystem respiration (ER) and aboveground plant respiration. Fire treatment decreased soil respiration (SR) and heterotrophic respiration (HR). Increases in ER and aboveground plant respiration were related to plant productivity. Reductions in SR and HR were caused by the suppressed microbial activity.

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“…However, the simultaneous N and water addition had no apparent effect on microbial C limitation relative to that of the W addition, indicated that water addition concealed the impacts of N deposition on the soil microbial Cacquiring capability by altering the interception and assimilation of N and water. Our previous studies have demonstrated that water addition can alleviate the suppressive effects of N deposition on soil microbial nutrient activity (Huang et al, 2015b;Luo et al, 2017) may be one reason for this phenomenon. Additionally, microorganisms are known to enhance the denitrification of N through extracellular enzymes (Tian et al, 2017;Zeglin et al, 2007;, and improve C utilization under humid conditions (Feng et al, 2019;Harpole et al, 2007).…”

Section: Microbial Metabolic Limitation Responses To N and Water Additionsmentioning

confidence: 99%

“…Artificial N and water additions played an important role in effecting soil microbial metabolic limitations (Ma et al, 2020;Wang et al, 2015). High N inputs into the soil can alter inorganic N instability (Chen et al, 2018a;Deng et al, 2020;Marklein and Houlton, 2012;Tecon and Or, 2017), and affect the respiratory substrates for soil microbial communities and delivering of soil extracellular enzymes (Chen et al, 2018b;Luo et al, 2017;Fujita et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Interactive Effects of Nitrogen and Water Addition on Soil Microbial Metabolic Limitation in Temperate Desert Shrublands

Xie

Zhang

et al. 2021

Preprint

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Aims Soil microbes play critical roles in regulating the turnover of soil organic carbon (SOC) and nutrients, and microbial metabolic limitation should draw more attention in desert ecosystems. However, soil extracellular enzymes activity (EEA) response and microbial metabolic limitation to atmospheric N deposition and increased precipitation in desert-shrubland are still poorly understood. Methods The study examined the effects of long-term (9 year) N and water additions (i.e., 5 g N m−2 yr−1, 30% ambient precipitation increase and their combination) on EEAs and soil microbial resource limitation, as well as explored their controlling factors in the Gurbantunggut Desert in northwestern China. Results The results showed that N and water additions significantly enhanced soil EEAs and considerably aggravated microbial phosphorous (P) limitation. Water addition and the N-water combination addition alleviated carbon (C) limitation, but N addition alone strengthened microbial C limitation. The interaction of N and water additions relieved the negative impact of N addition on soil microbial C limitation, and positively aggravated microbial P limitation. Soil microbial C limitation was primarily driven by soil moisture and organic C concentration, while the soil microbial N/P limitation was chiefly controlled by soil water and available P contents. Conclusions The influences of either N- or water addition alone on desert ecosystem biogeochemical processes may be altered by their concurrent occurrence. Overall, these findings highlight water availability is more effective at modifying microbial metabolisms than N accumulation in desert ecosystems. Altogether, this may help to predict how terrestrial C and nutrient flow could be induced by global change factors..

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Impacts of nitrogen addition on the carbon balance in a temperate semiarid grassland ecosystem

Cited by 25 publications

References 88 publications

Long-Term Warming and Nitrogen Addition Have Contrasting Effects on Ecosystem Carbon Exchange in a Desert Steppe

Long-Term Warming and Nitrogen Addition Have Contrasting Effects on Ecosystem Carbon Exchange in a Desert Steppe

Contrasting responses after fires of the source components of soil respiration and ecosystem respiration

Interactive Effects of Nitrogen and Water Addition on Soil Microbial Metabolic Limitation in Temperate Desert Shrublands

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