Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow

Ma, Shuang; Zhu, Xiaoxue; Zhang, Jing; Zhang, Lirong; Che, Rongxiao; Wang, Fang; Liu, Hanke; Niu, Haishan; Wang, Shiping; Cui, Xiaoyong

doi:10.1002/ece3.1646

Cited by 13 publications

(5 citation statements)

References 60 publications

(153 reference statements)

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“…The average coverages of graminoids, forbs, and legumes were about 86%, 86%, and 28%, respectively (Wang et al, 2012). A detailed description of the experimental site can be found in our previous studies Ma et al, 2015).…”

Section: Study Sitementioning

confidence: 99%

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Long-term warming rather than grazing significantly changed total and active soil procaryotic community structures

et al. 2018

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There is a paucity of knowledge in understanding the effects of warming and grazing on soil microbes and their active counterparts, especially on the Tibetan Plateau which is extremely sensitive to global warming and human activities. A six-year field experiment was conducted to investigate the effects of asymmetric warming and moderate grazing on total and active soil microbes in a Tibetan Kobresia alpine meadow. Soil bacterial abundance and 16S rDNA transcriptional activity were determined using real-time PCR. Total and active soil procaryotic community structures were analyzed through MiSeq sequencing based on 16S rDNA and rRNA, respectively. The results showed that the soil procaryotic community was more sensitive to the warming than the grazing. The warming significantly decreased soil microbial respiration rates, 16S rDNA transcription activity, and dispersion of total procaryotic community structures, but significantly increased the α diversity of active procaryotes. Warming also significantly increased the relative abundance of oligotrophic microbes, whereas decreasing the copiotrophic lineage proportions. The functional profiles predicted from the total procaryotic community structures remained unaffected by warming. However, the rRNA-based predictions suggested that DNA replication, gene expression, signal transduction, and protein degradation were significantly suppressed under the warming. The grazing only significantly decreased the 16S rDNA transcription and total procaryotic richness. Overall, these findings suggest that warming can shift soil procaryotic community to a more oligotrophic and less active status, highlighting the importance of investigating active microbes to improve our understanding of ecosystem feedbacks to climate change and human activities.

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Section: Study Sitementioning

confidence: 99%

“…Soil pH was determined using a pH meter in a 1:5 soil-water suspension. The soil microbial biomass was measured with the chloroform fumigation-extraction method, as detailed in our previous report (Ma et al, 2015).…”

Section: Soil Sampling and The Measurements Of Soil Properties And Bementioning

confidence: 99%

Long-term warming rather than grazing significantly changed total and active soil procaryotic community structures

et al. 2018

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“…High‐elevation systems differ from those located at high latitudes in light, temperature and precipitation patterns, all of which can influence N cycling, and therefore responses of N dynamics to warming in alpine areas remain largely unknown (but see Ma et al . ; Dawes et al . ).…”

Section: Introductionmentioning

confidence: 99%

“…The current understanding of how N dynamics in cold ecosystems will respond to increasing temperatures is almost entirely based on studies in (sub)arctic regions. High-elevation systems differ from those located at high latitudes in light, temperature and precipitation patterns, all of which can influence N cycling, and therefore responses of N dynamics to warming in alpine areas remain largely unknown (but see Ma et al 2015;Dawes et al 2017).…”

Section: Introductionmentioning

confidence: 99%

The fate of nitrogen inputs in a warmer alpine treeline ecosystem: a ¹⁵N labelling study

2017

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Summary Global warming may accelerate nitrogen (N) transformations in the soil, with potentially large effects in N‐poor high‐elevation ecosystems. To gain insight into the partitioning of inorganic and organic N inputs within the plant–soil system and how warming influences these patterns, we applied a 15N label (15NH4Cl or 15N‐glycine) shortly after snowmelt during the sixth year of experimental soil warming (+4 °C) at treeline in the Swiss Alps. Seven weeks after labelling, approximately 60% of the applied label remained in the soil organic layer to 10 cm depth, whereas label recovery summed over all measured plant pools was <10% of the added label. Soil warming led to a weaker Δ15N signal in plants and no change in the amount of added label recovered in plants. This 15N dilution resulted from a greater N pool size of some plant species in warmed plots as well as enhanced availability of (unlabelled) N under warming. Temporal dynamics of foliar Δ15N in dominant dwarf shrub species suggested that these plants primarily take up N early in the season. In a subset of plots labelled with 13C‐enriched glycine (U‐13C2‐15N‐glycine), the labelled glycine was mineralized rapidly, with approximately 50% of the applied 13C respired as CO2 during the first 99 h, suggesting that effects of warmer soils on N dynamics in this treeline system are only slightly modulated by the preferences of different plant species for inorganic and organic N forms. Synthesis. Plants growing in warmer soils acquired more unlabelled, soil‐derived N in the sixth year of treatment, implying a sustained increase in N mineralization and availability in alpine treeline ecosystems with higher soil temperatures predicted for the future. Wide variation in the ability of plant species and functional groups to compete for early‐summer N inputs means that there is a feedback between plant community shifts and N dynamics under environmental change at the treeline.

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“…Elevated temperature can promote soil nitrification and net N mineralization rate ( Melillo et al., 2011 ), but decrease the soil available P content ( Dijkstra et al., 2012 ), leading to the positive effect on plant nutrient uptake, higher plant N:P ratio, and lower C:N and C:P ratios. Conversely, drought induced by warming can depress N and P uptake by plant ( Ma et al., 2015 ), decreasing N and P concentration in plant tissues, and ultimately leading to a lower C:N and C:P ratios in plant ( Viciedo et al., 2019 ). Previous studies have reported inconsistent results about the response of soil and plant stoichiometry to warming in QTP.…”

Section: Introductionmentioning

confidence: 99%

Precipitation increase counteracts warming effects on plant and soil C:N:P stoichiometry in an alpine meadow

et al. 2022

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Temperature and precipitation are expected to increase in the forthcoming decades in the northeastern Qinghai-Tibetan Plateau, with uncertain effects of their interaction on plant and soil carbon:nitrogen:phosphorus (C:N:P) stoichiometry in alpine ecosystems. A two-year field experiment was conducted to examine the effects of warming, precipitation increase, and their interaction on soil and plant C:N:P stoichiometry at functional groups and community level in an alpine meadow. Warming increased aboveground biomass of legumes and N:P ratios of grasses and community, but did not affect soil C:N:P stoichiometry. The piecewise structural equation model (SEM) indicated that the positive effect of warming on community N:P ratio was mainly resulted from its positive influence on the aboveground biomass of functional groups. Precipitation increase reduced C:N ratios of soil, grasses, and community, indicating the alleviation in soil N-limitation and the reduction in N use efficiency of plant. SEM also demonstrated the decisive role of grasses C:N:P stoichiometry on the response of community C:N:P stoichiometry to precipitation increase. The interaction of warming and precipitation increase did not alter plant community and soil, N:P and C:P ratios, which was resulting from their antagonistic effects. The stable soil and plant community C:N:P stoichiometry raised important implications that the effect of warming was offset by precipitation increase. Our study highlights the importance of considering the interaction between warming and precipitation increase when predicting the impacts of climate change on biogeochemical cycles in alpine meadow ecosystems.

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Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow

Cited by 13 publications

References 60 publications

Long-term warming rather than grazing significantly changed total and active soil procaryotic community structures

Long-term warming rather than grazing significantly changed total and active soil procaryotic community structures

The fate of nitrogen inputs in a warmer alpine treeline ecosystem: a ¹⁵N labelling study

Precipitation increase counteracts warming effects on plant and soil C:N:P stoichiometry in an alpine meadow

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Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow

Cited by 13 publications

References 60 publications

Long-term warming rather than grazing significantly changed total and active soil procaryotic community structures

Long-term warming rather than grazing significantly changed total and active soil procaryotic community structures

The fate of nitrogen inputs in a warmer alpine treeline ecosystem: a 15N labelling study

Precipitation increase counteracts warming effects on plant and soil C:N:P stoichiometry in an alpine meadow

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The fate of nitrogen inputs in a warmer alpine treeline ecosystem: a ¹⁵N labelling study