Composition of the soil fungal community is more sensitive to phosphorus than nitrogen addition in the alpine meadow on the Qinghai-Tibetan Plateau

He, Dan; Xiang, Xingjia; He, Jin‐Sheng; Wang, Chao; Cao, Guangmin; Adams, Jonathan M.

doi:10.1007/s00374-016-1142-4

Cited by 117 publications

(77 citation statements)

References 83 publications

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“…N enrichment altered the bacterial community structure due to declines in the relative abundance of oligotrophic phyla (mainly Acidobacteria and Chloroflex ) and increases in copiotrophic taxa (mainly Proteobacteria and Saccharibacteria ), which was consistent with other reports (Fierer et al, ; Leff et al, ; Ramirez, Lauber, Knight, Bradford, & Fierer, ). Although N enrichment did not alter fungal OTU richness, N enrichment substantially changed the structure of the soil fungal community due to the increases in the relative abundance of wood‐decay fungal taxa ( Ascomycota , Eurotiomycetes and Sordariomycetes ); these changes have often been observed in grassland or farmland soils (He et al, ; Zhou et al, ). Overall, our study represents one of a few PLFA‐ and sequence‐based assessments of both the bacterial and fungal communities.…”

Section: Discussionmentioning

confidence: 99%

Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi‐arid grassland

et al. 2018

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Semi‐arid grasslands on the Mongolian Plateau are expected to experience high inputs of anthropogenic reactive nitrogen in this century. It remains unclear, however, how soil organisms and nutrient cycling are directly affected by N enrichment (i.e., without mediation by plant input to soil) vs. indirectly affected via changes in plant‐related inputs to soils resulting from N enrichment. To test the direct and indirect effects of N enrichment on soil organisms (bacteria, fungi and nematodes) and their associated C and N mineralization, in 2010, we designated two subplots (with plants and without plants) in every plot of a six‐level N‐enrichment experiment established in 1999 in a semi‐arid grassland. In 2014, 4 years after subplots with and without plant were established, N enrichment had substantially altered the soil bacterial, fungal and nematode community structures due to declines in biomass or abundance whether plants had been removed or not. N enrichment also reduced the diversity of these groups (except for fungi) and the soil C mineralization rate and induced a hump‐shaped response of soil N mineralization. As expected, plant removal decreased the biomass or abundance of soil organisms and C and N mineralization rates due to declines in soil substrates or food resources. Analyses of plant‐removal‐induced changes (ratios of without‐ to with‐plant subplots) showed that micro‐organisms and C and N mineralization rates were not enhanced as N enrichment increased but that nematodes were enhanced as N enrichment increased, indicating that the effects of plant removal on soil organisms and mineralization depended on trophic level and nutrient status. Surprisingly, there was no statistical interaction between N enrichment and plant removal for most variables, indicating that plant‐related inputs did not qualitatively change the effects of N enrichment on soil organisms or mineralization. Structural equation modelling confirmed that changes in soil communities and mineralization rates were more affected by the direct effects of N enrichment (via soil acidification and increased N availability) than by plant‐related indirect effects. Our results provide insight into how future changes in N deposition and vegetation may modify below‐ground communities and processes in grassland ecosystems. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.13226/suppinfo is available for this article.

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Section: Discussionmentioning

confidence: 99%

Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi‐arid grassland

et al. 2018

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“…In support of this deduction, our results indicated that the C:P and N:P ratios in the permafrost layer were significantly higher than those in the active layer (all p < .05), implying that P is much less abundant than C and N in the permafrost layer. Moreover, a previous study reported that P addition exerted significant effects on microbial beta diversity in Tibetan alpine grasslands (He et al., ), indicating that P is an important soil nutrient regulating microbial communities in these ecosystems. Although soils store a large quantity of total P, the available P is rather limited on the Tibetan Plateau (He et al., ).…”

Section: Discussionmentioning

confidence: 95%

“…Moreover, a previous study reported that P addition exerted significant effects on microbial beta diversity in Tibetan alpine grasslands (He et al., ), indicating that P is an important soil nutrient regulating microbial communities in these ecosystems. Although soils store a large quantity of total P, the available P is rather limited on the Tibetan Plateau (He et al., ). The low P availability might alter the growth of certain microbial populations (Siciliano et al., ) and thus affect the microbial communities.…”

Section: Discussionmentioning

confidence: 95%

Distinct microbial communities in the active and permafrost layers on the Tibetan Plateau

et al. 2017

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Permafrost represents an important understudied genetic resource. Soil microorganisms play important roles in regulating biogeochemical cycles and maintaining ecosystem function. However, our knowledge of patterns and drivers of permafrost microbial communities is limited over broad geographic scales. Using high-throughput Illumina sequencing, this study compared soil bacterial, archaeal and fungal communities between the active and permafrost layers on the Tibetan Plateau. Our results indicated that microbial alpha diversity was significantly higher in the active layer than in the permafrost layer with the exception of fungal Shannon-Wiener index and Simpson's diversity index, and microbial community structures were significantly different between the two layers. Our results also revealed that environmental factors such as soil fertility (soil organic carbon, dissolved organic carbon and total nitrogen contents) were the primary drivers of the beta diversity of bacterial, archaeal and fungal communities in the active layer. In contrast, environmental variables such as the mean annual precipitation and total phosphorus played dominant roles in driving the microbial beta diversity in the permafrost layer. Spatial distance was important for predicting the bacterial and archaeal beta diversity in both the active and permafrost layers, but not for fungal communities. Collectively, these results demonstrated different driving factors of microbial beta diversity between the active layer and permafrost layer, implying that the drivers of the microbial beta diversity observed in the active layer cannot be used to predict the biogeographic patterns of the microbial beta diversity in the permafrost layer.

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“…However, legumes benefit less from N addition compared to other species, and the competitive advantage of legumes disappeared after N addition (Ren et al 2016, Xiang et al 2016), resulting in decreases in legume biomass, relative abundance and plant height and causing more dramatic changes in legume phenology (Zhang et al 2013b). In addition, as the dominant species in the community (Supplementary material Appendix 1 Data A2), grass and forbs have advantages in resource acquisition (Chapin 1980, Nitschke et al 2017, and became more productive under N addition treatment (He et al 2016), which delayed the time of plant transition from the growth to reproduction stage (Cleland et al 2006). However, if nutrients are not limiting, some grasses and forbs are capable of luxury uptake (Chapin 1980), which may result in no change in phenology following N addition (Zhang et al 2013a).…”

Section: Response Of Phenology To N Addition In Different Functional mentioning

confidence: 99%

Responses of plant phenology to nitrogen addition: a meta‐analysis

Wang

Tang

2019

Oikos

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Phenology is one of the most sensitive processes of plant in response to global change. Anthropogenic activities have considerably increased nitrogen (N) deposition, which significant affects plant phenology. Although numerous individual studies have been conducted, it remains controversial how N addition affects phenological stages, and a comprehensive understanding of how plant phenology responds to external N inputs remains elusive. To reconcile the differences, we conducted a meta‐analysis of 117 species to examine the responses of plant phenology to N addition in terrestrial ecosystems, and assessed variations in their responses in relation to ecosystem types, functional groups, and environmental conditions. Our results showed that plant phenology changed significantly after N addition, and phenology time delayed and phenology duration shortened significantly across all biomes except fruiting duration, but varied with biome types. The phenology change in cropland was more dramatical than in grassland after N addition, even in opposite directions. The response of phenological stages to N addition was consistent in two pollination types except the flowering time, the flowering time had no change in anemophilous but significantly delayed in entomophilous. In addition, the response of phenology to N addition was discrepancy among functional groups, the phenology time advanced and duration shortened in sedge, while phenology time delayed and duration shortened in other groups, and the phenology change in legume was larger than grass and forbs. We also found that environmental factors had little effects on the response of plant phenology to N addition, but significant correlation was found between the response ratios of different phenological stages. Our study suggested that phenology was sensitive to N deposition at many phenological stages, and changes in phenology may be smaller with community biodiversity increasing at ecosystem level.

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Composition of the soil fungal community is more sensitive to phosphorus than nitrogen addition in the alpine meadow on the Qinghai-Tibetan Plateau

Cited by 117 publications

References 83 publications

Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi‐arid grassland

Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi‐arid grassland

Distinct microbial communities in the active and permafrost layers on the Tibetan Plateau

Responses of plant phenology to nitrogen addition: a meta‐analysis

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