A global meta-analyses of the response of multi-taxa diversity to grazing intensity in grasslands

Wang, Chao; Tang, Yawei

doi:10.1088/1748-9326/ab4932

Cited by 92 publications

(67 citation statements)

References 58 publications

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“…The relationship between the biotic and abiotic factors was investigated by Pearson's correlation and analysis of covariance. Structural equation modeling (SEM) was employed to evaluate the hypothesized underlying factors that influence biodiversity in above‐ and belowground under different restoration methods (Wang et al, ; Wang & Tang, ) using the package “piecewise‐SEM” in R (Shipley, ). The restoration methods were converted to numeric variables in the SEM, where 0 represents natural recovery, and 1 represent sown treatments.…”

Section: Methodsmentioning

confidence: 99%

“…Structural equation modeling (SEM) was employed to evaluate the hypothesized underlying factors that influence biodiversity in above-and belowground under different restoration methods Wang & Tang, 2019) using the package "piecewise-SEM" in R (Shipley, 2000). The restoration methods were con- All statistical analyses and graphs were prepared in R 3.2.2 (R Core Team, 2018).…”

Section: Statistical Analysesmentioning

confidence: 99%

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Revegetation by sowing reduces soil bacterial and fungal diversity

Wang

Zhang

Zhao

et al. 2019

Ecology and Evolution

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Aim:The aim of this study was to understand the effects of revegetation on the diversity of bacteria and fungi in soil by sowing a single species and exploring the underlying mechanism.Location: Beijing, China. Taxon: Plants and Microbes.Methods: In a short-term ecological restoration experiment, one natural recovery treatment and three seed sowing treatments were chosen to assess their effects on the alteration of fungal and bacterial diversity. Plant species richness, abundance, and height were investigated. The diversity of fungi and bacteria was analyzed by high-throughput sequencing technologies. Linear mixed-effects model analysis was used to examine the effects of different restoration methods on biodiversity and ecosystem functions. Pearson's correlation analysis, analysis of covariance, and structural equation modeling (SEM) were used to examine the relationship between biodiversity and environmental factors. Results: Species richness and the Shannon-Wiener Index (H′) of plants in the sown treatments were lower than in the natural recovery treatment, especially with sowing of Medicago sativa L. Similarly, the sum of the observed species and H′ of fungi and bacteria significantly decreased in the sown treatments. Moreover, plant density, community coverage, and soil moisture increased markedly, while soil bulk density decreased in the sown treatments. Importantly, SEM showed that sown treatments reduced the diversity of plants through increasing plant density, while it decreased the diversity of fungi and bacteria through decreasing the plant diversity and increasing soil moisture.Main conclusions: Our findings confirm that ecological restoration by sowing could improve soil conditions, but may be unfavorable to the amelioration of soil microbial diversity in the short-term. Restoration practitioners should consider long-term studies on the dynamics of biodiversity in the above-and belowground after revegetation by native species to achieve goals related to biodiversity conservation.

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Section: Methodsmentioning

confidence: 99%

Section: Statistical Analysesmentioning

confidence: 99%

Revegetation by sowing reduces soil bacterial and fungal diversity

Wang

Zhang

Zhao

et al. 2019

Ecology and Evolution

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“…Mackey, et al [61] concluded from a meta-analysis that nonsignificant relationships between grazing disturbance and diversity, richness, and evenness are common. From the meta-analyses of Wang, et al [62], the plant diversity significantly increases after grazing, but the change of species richness and diversity affected by grazing is smaller from a world-wide meta-analysis [21].…”

Section: Response Of Species Diversity and Composition To Grazingmentioning

confidence: 99%

Vegetation Response to Goats Grazing Intensity in Semiarid Hilly Grassland of the Loess Plateau, Lanzhou, China

et al. 2021

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Quantitatively estimating the grazing intensity (GI) effects on vegetation in semiarid hilly grassland of the Loess Plateau can help to develop safe utilization levels for natural grasslands, which is a necessity of maintaining livestock production and sustainable development of grasslands. Normalized difference vegetation index (NDVI), field vegetation data, and 181 days (one goat per day) of GPS tracking were combined to quantify the spatial pattern of GI, and its effects on the vegetation community structure. The spatial distribution of GI was uneven, with a mean value of 0.50 goats/ha, and 95% of the study area had less than 1.30 goats/ha. The areas with utilization rates of rangeland (July) lower than 45% and 20% made up about 95% and 60% of the study area, respectively. Grazing significantly reduced monthly aboveground biomass, but the grazing effects on plant growth rate were complex across the different plant growth stages. Grazing impaired plant growth in general, but the intermediate GI appeared to facilitate plant growth rate at the end of the growing seasons. Grazing had minimal relationship with vegetation community structure characteristics, though Importance Value of forbs increased with increasing GI. Flexibility in the number of goats and conservatively defining utilization rate, according to the inter-annual variation of utilization biomass, would be beneficial to achieve ecologically healthy and economically sustainable GI.

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“…For instance, Didiano et al (2014) found that only one out of four-studied plant species (Festuca rubra, the most abundant species) showed the evolutionary responses (trait differentiation in leaf numbers) in a long-term ([ 20 years) rabbit exclosure experiment in Silwood Park, England. Second, given that grazing intensity plays an important role in regulating plant communities ecologically (Wang and Tang 2019), their evolutionary effects may also only become apparent when grazing intensity is high. However, to my knowledge, the evolutionary responses of plant populations to grazing intensity along a successional gradient has rarely been studied.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary responses of a dominant plant along a successional gradient in a salt-marsh system

Chen

2021

Plant Ecol

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The ecological responses of plant populations along a successional gradient have been intensively examined; however, the evolutionary responses received much less attention. Here, I explored genetic changes of key phenotypic traits of a dominant clonal plant (Elytrigia atherica) along a saltmarsh successional gradient by collecting samples along the successional gradient in the high and low marsh and growing them in a common environment (greenhouse). Additionally, to explore whether changes in traits are driven by abiotic (e.g. clay thickness) and biotic (e.g. grazing intensity) variables along the successional gradient, I measured these two variables in the field. I found that clay thickness (a proxy of total nitrogen) increased along the successional gradient both in the high and low marsh; grazing intensity from hares (the most important herbivores) decreased along the successional gradient in the high marsh but did not change in the low marsh. Meanwhile, I found that growth in number of leaves and ramets decreased, while rhizome length increased, along the successional gradient for E. atherica collected from the high marsh. Opposite trends were found for E. atherica collected from the low marsh. Results suggest that, in the high marsh, herbivores may overrule nutrients to drive trait changes. That is, at the early successional stages, E. atherica had higher growth in number of leaves and ramets to compensate for high-intensity grazing. In the low marsh, nutrients may be the dominant driver for trait changes. That is, at the late successional stages, E. atherica had higher growth in number of leaves and ramets but shorter rhizomes to maximize its expansion under the favorable conditions (higher nutrient availability). Results suggest that ecologically important abiotic and biotic variables such as nutrients and herbivores may also have a substantial evolutionary impact on plant populations.

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A global meta-analyses of the response of multi-taxa diversity to grazing intensity in grasslands

Cited by 92 publications

References 58 publications

Revegetation by sowing reduces soil bacterial and fungal diversity

Revegetation by sowing reduces soil bacterial and fungal diversity

Vegetation Response to Goats Grazing Intensity in Semiarid Hilly Grassland of the Loess Plateau, Lanzhou, China

Evolutionary responses of a dominant plant along a successional gradient in a salt-marsh system

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