Plant and soil’s δ15N are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau

Wu, Jian; Song, Maoyong; Ma, Wang; Zhang, Xianzhou; Shen, Zhenxi; Tarolli, Paolo; Wurst, Susanne; Shi, Peili; Ratzmann, Gregor; Feng, Ying; Li, Meng; Wang, Xiangtao; Tietjen, Britta

doi:10.1016/j.agee.2019.05.011

Cited by 30 publications

(24 citation statements)

References 79 publications

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“…However, it has not been widely applied in alpine grassland of QTP. Besides, scholars studied the direct and indirect effects of environmental factors on ecosystem function, productivity partitioning, species diversity, and functional diversity on the QTP by structural equation model (Jing et al, 2015; Wu, Li et al, 2019; Wu, Song, et al, 2019), but the regulation of these factors on productivity is not clear.…”

Section: Introductionmentioning

confidence: 99%

Rotational grazing promotes grassland aboveground plant biomass and its temporal stability under changing weather conditions on the Qinghai‐Tibetan plateau

et al. 2020

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The aboveground biomass (AGB) production of grazed grasslands is mediated by climate, soil nutrients, livestock and other factors. How the biotic and abiotic factors directly or indirectly regulate AGB remains unclear. To fill this gap, from 2014 to 2017, we conducted a rotational grazing experiment to examine the response of AGB to biotic and abiotic factors in Nagqu, a typical alpine meadow community on the Qinghai-Tibetan Plateau. Six yaks were rotationally grazed among three plots from July to September, meanwhile, three plots were set up to exclude from livestock as control; climate, plant biomass, and soil nutrients were investigated during grazing experiment, and then structural equation modeling was used to analyze the regulation of environmental factors on AGB. The results showed that precipitation affected AGB via affecting soil nitrate nitrogen (NO 3-N), compensatory growth rate, and belowground biomass indirectly; temperature can directly and negatively affected AGB. In contrast grazing exclosure, rotational grazing increased both AGB and its temporal stability in alpine meadow community significantly (p < .05). The temporal stability of the AGB was positively related to the asynchrony between high-and lowpalatability herbages (p < .05). In conclusion, rotational grazing should be recommendable for alpine meadow management due to its benefits for community productivity and stability while current stocking rate should be reduced to a reasonable level, especially in a warm and drought year, to sustain plant compensatory growth under grazing.

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Section: Introductionmentioning

confidence: 99%

Rotational grazing promotes grassland aboveground plant biomass and its temporal stability under changing weather conditions on the Qinghai‐Tibetan plateau

et al. 2020

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“…The biomass from the different plant groups was milled to a fine powder for measurement of vegetation δ 13 C and δ 15 N. The community δ 13 C and δ 15 N were obtained from the weighted average of δ 13 C and δ 15 N for each plant group, by using their proportional biomasses as the weights. An isotope ratio mass spectrometer (Delta V Advantage, Thermo Fisher Scientific, Inc., USA) was used to determine the vegetation and soil δ 13 C and δ 15 N (Wu et al, 2019; Yang et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…The natural abundances of stable carbon (C) and nitrogen (N) isotopes, δ 13 C and δ 15 N, are increasingly used to investigate the biogeochemical mechanisms that control C and N processes in ecosystems (Dong et al, 2018; Golluscio et al, 2009; Zhao et al, 2019) as the isotope content reflects the C and N inputs and outputs, and transformations of C and N at the vegetation‐soil interface (Wang et al, 2013; Wu et al, 2019). The δ 13 C isotope of plant heavily depends on the plant's photosynthetic pathways and that of soil depends on the plant‐derived organic C and fractionation during the soil organic matter (SOM) decomposition and microbial mobilization (An & Li, 2015; Dixon et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Generally, inputs from livestock manure, N deposition, and biological N fixation deliver 15 N‐depleted compounds to the ecosystem (Evans & Belnap, 1999; Fang et al, 2011). The plant δ 15 N depends on different preferences of species to the major forms of available N (Xu et al, 2011), or the fractionation during plant‐mycorrhiza transfer processes (Klaus et al, 2013; Wu et al, 2019). The soil δ 15 N is mostly affected by soil microbial mediated N‐cycling processes, such as mineralization, nitrification, and denitrification (Frank, Groffman, & Tracy, 2000; Golluscio et al, 2009; Högberg, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Plant community changes determine the vegetation and soil δ¹³C and δ¹⁵N enrichment in degraded alpine grassland

Peng

Xue

et al. 2021

Land Degrad Dev

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δ13C and δ15N are extensively used to understand the biogeochemical mechanisms that moderate ecosystem carbon (C) and nitrogen (N) processes. Little is known about the responses of δ13C and δ15N to alpine grassland degradation on the Qinghai‐Tibetan Plateau (QTP), which prevents a full understanding of degradation‐induced changes in C and N cycling there. We investigated the vegetation δ13C and δ15N, soil δ13C and δ15N, soil properties, and plant community composition of alpine grassland on the QTP that were in different states of degradation. Our results show that the vegetation δ13C and δ15N, and soil δ13C and δ15N, increased with the severity of degradation, whereas soil organic carbon (SOC) and total N content decreased as degradation became more severe. The aboveground biomass percentage of forbs was positively correlated with the soil C/N ratio, vegetation δ13C, and soil δ13C, and accounted for the largest proportion of the variance for both vegetation δ13C and soil δ13C (17.25 and 23.65%, respectively). The vegetation δ15N and soil δ15N were negatively correlated with the soil C/N ratio, which explained the largest proportion of the variance (18.01 and 25.81%, respectively). Our results suggest that C cycling is strongly moderated by plant community composition, because forbs species and C4 species, were more prevalent in degraded alpine grassland. Meanwhile, N cycling is indirectly regulated by changes in community composition via its effect on the soil C/N as the degradation became more severe for alpine grassland on the QTP.

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“…The intermediate products of the N cycle process, such as nitrate nitrogen (NO 3 − − N), nitrous oxide (N 2 O) and nitric oxide (NO), may also cause eco-environmental problems such as eutrophication of water body and aggravation of greenhouse effect (Liao et al, 2019). Therefore, it is of great significance to reveal the openness of the ecosystem N cycle process for understanding the plant N fixation and long-term trend of N cycling and protecting the eco-environment (Wang et al, 2014;Wu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Soil and plant δ<sup>15</sup>N have a different response to experimental warming: A global meta-analysis

Liao

Lai

Zhu

2021

Preprint

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Abstract. The 15N natural abundance composition (δ15N) in soils or plants is a useful tool to indicate the openness of ecosystem N cycling. This study was aimed to evaluate the influence of the global warming on soil and plant δ15N. We applied a global meta-analysis method to synthesize 79 and 76 paired observations for soil and plant δ15N from 20 published studies, respectively. Results showed that the mean effect sizes of the soil and plant δ15N under experimental warming were −0.524 (95 % CI: −0.987 to −0.162) and 0.189 (95 % CI: −0.210 to 0.569), respectively. This indicated that soil and plant δ15N had negative and positive responses to warming at the global scale, respectively. Experimental warming significantly (p < 0.05) decreased soil δ15N in Alkali soil, grassland/meadow, and under air warming, whereas it significantly (p < 0.05) increased soil δ15N in neutral soil. Plant δ15N significantly (p < 0.05) increased with increasing temperature in neutral soil and significantly (p < 0.05) decreased in alkali soil. Latitude did not affect the warming effects on both soil and plant δ15N. However, the warming effect on soil δ15N was positively controlled by the mean annual temperature, which is related to the fact that the higher temperature can strengthen the activity of soil microbes. The effect of warming on plant δ15N had weaker relationships with environmental variables compared with that on soil δ15N. This implied that soil δ15N tended to be more efficient in indicating the openness of global ecosystem N cycling than plant δ15N.

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Plant and soil’s δ15N are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau

Cited by 30 publications

References 79 publications

Rotational grazing promotes grassland aboveground plant biomass and its temporal stability under changing weather conditions on the Qinghai‐Tibetan plateau

Rotational grazing promotes grassland aboveground plant biomass and its temporal stability under changing weather conditions on the Qinghai‐Tibetan plateau

Plant community changes determine the vegetation and soil δ¹³C and δ¹⁵N enrichment in degraded alpine grassland

Soil and plant δ<sup>15</sup>N have a different response to experimental warming: A global meta-analysis

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Plant and soil’s δ15N are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau

Cited by 30 publications

References 79 publications

Rotational grazing promotes grassland aboveground plant biomass and its temporal stability under changing weather conditions on the Qinghai‐Tibetan plateau

Rotational grazing promotes grassland aboveground plant biomass and its temporal stability under changing weather conditions on the Qinghai‐Tibetan plateau

Plant community changes determine the vegetation and soil δ13C and δ15N enrichment in degraded alpine grassland

Soil and plant δ&lt;sup&gt;15&lt;/sup&gt;N have a different response to experimental warming: A global meta-analysis

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Plant community changes determine the vegetation and soil δ¹³C and δ¹⁵N enrichment in degraded alpine grassland

Soil and plant δ<sup>15</sup>N have a different response to experimental warming: A global meta-analysis