Impact of nitrogen addition on plant community in a semi-arid temperate steppe in China

Liu, Song; Bao, Xuemei; Liu, Xuejun; Zhang, Fusuo

doi:10.3724/sp.j.1227.2012.00003

Cited by 43 publications

(30 citation statements)

References 26 publications

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“…Grasses, especially S. viridis , produced the majority of total biomass of the community, suggesting that grasses were the dominant functional group and S. viridis was the dominant species in this community. Grasses were more sensitive to nutrient addition and able to obtain more nutrients under the enrichment treatment, as observed in other studies9104445. As such, the resistance of the community to invasion may be attributed to the functional identity of resident competitors.…”

Section: Discussionsupporting

confidence: 70%

Nutrient enrichment alters impacts of Hydrocotyle vulgaris invasion on native plant communities

Liu

Quan

Dong

et al. 2016

Sci Rep

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Nutrients may affect the invasiveness of alien plants and the invasibility of native plant communities. We performed a greenhouse experiment to investigate the interactive effect of invasion by a clonal herb Hydrocotyle vulgaris and nutrient enrichment on biomass and evenness of native plant communities. We established three types of plant communities (H. vulgaris alone, native plant communities without or with H. vulgaris) under low and high levels of nutrients. Native communities consisted of eight native, terrestrial species of three functional groups, i.e. four grasses, two legumes, and two forbs. Invasion of H. vulgaris had no effect on biomass of the native community, the functional groups, or the individual species. High nutrients increased biomass of grasses, but reduced evenness of the community. High nutrients also decreased the competitive effect, and the relative dominance index of H. vulgaris. Therefore, high nutrients reduced the competitive ability of H. vulgaris and enhanced the resistance of the native community to invasion. The results provide a basis for management strategies to control the invasion and spread of H. vulgaris by manipulating resource availability to support native communities.

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Section: Discussionsupporting

confidence: 70%

Nutrient enrichment alters impacts of Hydrocotyle vulgaris invasion on native plant communities

Liu

Quan

Dong

et al. 2016

Sci Rep

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“…Indeed, our data support this with alpha diversity (calculated based on 16S amplicon analysis at both DNA and RNA) decreasing in response to urea. This is inconsistent with plant responses to nutrient deposition in which multiple resources need to be added to elicit a response (Harpole & Stevens, ), although contrasting results have been observed (Bai, Wu, Clark, Naeem, & Pan, ; Song, Bao, Liu, & Zhang, ; Song et al., ; Suding et al., ). For microbes, high site to site variance is reported (De Schrijver et al., ; Leff et al., ), but similar negative responses are suggested and could be linked to increased competition in the absence of natural ecosystem variability.…”

Section: Discussionmentioning

confidence: 93%

Response to nitrogen addition reveals metabolic and ecological strategies of soil bacteria

et al. 2017

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The nitrogen (N) cycle represents one of the most well-studied systems, yet the taxonomic diversity of the organisms that contribute to it is mostly unknown, or linked to poorly characterized microbial groups. While new information has allowed functional groups to be refined, they still rely on a priori knowledge of enzymes involved and the assumption of functional conservation, with little connection to the role the transformations, plays for specific organisms. Here, we use soil microcosms to test the impact of N deposition on prokaryotic communities. By combining chemical, genomic and transcriptomic analysis, we are able to identify and link changes in community structure to specific organisms catalysing given chemical reactions. Urea deposition led to a decrease in prokaryotic richness, and a shift in community composition. This was driven by replacement of stable native populations, which utilize energy from N-linked redox reactions for physiological maintenance, with fast responding populations that use this energy for growth. This model can be used to predict response to N disturbances and allows us to identify putative life strategies of different functional and taxonomic groups, thus providing insights into how they persist in ecosystems by niche differentiation.

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“…For example, several studies have reported significant increases in the AGB of grasses and sedges 3, 23, 27 , significant decreases in the AGB of legumes 3, 27 , and insignificant changes in the AGB of forbs 27 following N addition. However, whether a general pattern of the responses of different plant functional types in grasslands to N addition exists at the global scale remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Grass and forbs respond differently to nitrogen addition: a meta-analysis of global grassland ecosystems

You

You-min

et al. 2017

Sci Rep

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Nitrogen (N) deposition has increased globally and has profoundly influenced the structure and function of grasslands. Previous studies have discussed how N addition affects aboveground biomass (AGB), but the effects of N addition on the AGB of different functional groups in grasslands remain unclear. We conducted a meta-analysis to identify the responses of AGB and the AGB of grasses (AGB grass ) and forbs (AGB forb ) to N addition across global grasslands. Our results showed that N addition significantly increased AGB and AGB grass by 31 and 79%, respectively, but had no significant effect on AGB forb . The effects of N addition on AGB and AGB grass increased with increasing N addition rates, but which on AGB forb decreased. Although study durations did not regulate the response ratio of N addition for AGB, which for AGB grass increased and for AGB forb decreased with increasing study durations. Furthermore, the N addition response ratios for AGB and AGB grass increased more strongly when the mean annual precipitation (MAP) was 300-600 mm but decreased with an increase in the mean annual temperature (MAT). AGB forb was only slightly affected by MAP and MAT. Our findings suggest that an acceleration of N deposition will increase grassland AGB by altering species composition.Nitrogen (N) deposition in terrestrial ecosystems is estimated to increase to 200 Tg N yr −1 by 2050 due to industrial and agricultural N fertilizer use 1 . Nitrogen enrichment will potentially influence species diversity, biomass production and soil conditions 2-6 . The effects of N addition on forest ecosystem biomass have been summarized and analysed in previous studies 7-9 . However, because grasslands are mainly controlled by water, the effects of changes in precipitation patterns on aboveground biomass (AGB) were emphasized in previous studies [10][11][12] , and the effects of N addition on grassland biomass remain unknown. Grasslands are a type of terrestrial ecosystem and cover approximately 25% of the land surface on Earth 13 . AGB is an important contributor to soil organic matter, which significantly impacts the global carbon cycle under the background of N deposition 14,15 . Therefore, analysing and summarizing the effects of N addition on grassland AGB are particularly important for estimating and predicting the carbon budget under climate change.Many case studies that have been conducted to understand how N addition (N deposition) affects grassland AGB have yielded significantly different results 2, 16-18 . For example, several studies have reported significant increases 2,18,19 and decreases 17 or insignificant changes in AGB 16,20 following N addition. The differences between these results may be attributed to the use of different N addition rates, study durations, plant functional types and climatic conditions (such as the mean annual precipitation (MAP) or the mean annual temperature (MAT)). For instance, some previous studies have demonstrated a threshold value for the positive effects of N addition on AGB 2,21 . If N appl...

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Impact of nitrogen addition on plant community in a semi-arid temperate steppe in China

Cited by 43 publications

References 26 publications

Nutrient enrichment alters impacts of Hydrocotyle vulgaris invasion on native plant communities

Nutrient enrichment alters impacts of Hydrocotyle vulgaris invasion on native plant communities

Response to nitrogen addition reveals metabolic and ecological strategies of soil bacteria

Grass and forbs respond differently to nitrogen addition: a meta-analysis of global grassland ecosystems

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