AimLivestock grazing can alter carbon (C), nitrogen (N) and phosphorus (P) cycles, thereby affecting the C : N : P stoichiometry in grasslands. In this study, we aimed to examine mechanisms underlying the impacts of grazing on grassland C : N : P stoichiometry, focusing on belowground processes and their linkages with aboveground vegetation properties.LocationGlobal.Time period1900–2018.Major taxa studiedGrassland ecosystems.MethodsWe conducted a meta‐analysis based on 129 published studies to synthesize the effects of grazing on the C : N : P stoichiometry of leaves, stems, litter, roots, microbial biomass, and soil in grassland ecosystems.ResultsGrazing significantly affected the C, N and P pools, and then the C : N : P stoichiometry in grassland ecosystems. Grazing effects on C : N : P stoichiometry varied strongly with grazing intensity. Specifically, heavy grazing decreased all C : N : P stoichiometry except litter N : P and root C : N ratios, while light and moderate grazing caused less negative or positive effects. Grazing effects on litter C : N ratio were negatively correlated with grazing effects on soil C : N ratios under light and moderate grazing, but this relationship was positive under heavy grazing. In contrast, grazing effects on root C : P and soil C : P were positively correlated under light and moderate grazing but negatively correlated under heavy grazing. Importantly, grazing significantly decreased the soil N pool by 10.0% but increased the soil P pool by 3.6%, indicating differential mechanisms for grazing impact on N and P cycles in grasslands.Main conclusionsOur results strongly suggest that grazing intensity regulates the biogeochemical cycles of C, N and P in grassland ecosystems by affecting plant nutrient use efficiency and soil physicochemical processes. Therefore, incorporating grazing intensity into Earth system models may improve predictions of climate–grassland feedbacks in the Anthropocene.

Predicting future carbon (C) dynamics in grassland ecosystems requires knowledge of how grazing and global climate change (e.g., warming, elevated CO2, increased precipitation, drought, and N fertilization) interact to influence C storage and release. Here, we synthesized data from 223 grassland studies to quantify the individual and interactive effects of herbivores and climate change on ecosystem C pools and soil respiration (Rs). Our results showed that grazing overrode global climate change factors in regulating grassland C storage and release (i.e., Rs). Specifically, grazing significantly decreased aboveground plant C pool (APCP), belowground plant C pool (BPCP), soil C pool (SCP), and Rs by 19.1%, 6.4%, 3.1%, and 4.6%, respectively, while overall effects of all global climate change factors increased APCP, BPCP, and Rs by 6.5%, 15.3%, and 3.4% but had no significant effect on SCP. However, the combined effects of grazing with global climate change factors also significantly decreased APCP, SCP, and Rs by 4.0%, 4.7%, and 2.7%, respectively but had no effect on BPCP. Most of the interactions between grazing and global climate change factors on APCP, BPCP, SCP, and Rs were additive instead of synergistic or antagonistic. Our findings highlight the dominant effects of grazing on C storage and Rs when compared with the suite of global climate change factors. Therefore, incorporating the dominant effect of herbivore grazing into Earth System Models is necessary to accurately predict climate–grassland feedbacks in the Anthropocene.

1. As the key carbon (C) fluxes between biosphere and atmosphere, soil respiration (R s ) and ecosystem respiration (R e ) play vital roles in regulating global C balance and climate-biosphere feedback in the Earth system. Despite the fact that numerous manipulative studies and a few meta-analyses have been conducted to examine the responses of R s and its components (i.e. autotrophic [R a ] and heterotrophic respiration [R h ]) as well as R e to grazing (G) or global change factors, the interactive effects between grazing and global change factors remain poorly understood. 2. Here, we performed a comprehensive meta-analysis of manipulative experiments with both grazing and global change factors to quantify their individual and interactive effects on R s and its components as well as R e .3. Our results showed that grazing and drought significantly decreased R s by 12.35% and 20.95%, respectively, whereas warming (W), nitrogen addition (N) and increased precipitation (P) stimulated it by 2.12%, 5.49% and 13.44%, respectively.Similarly, grazing, warming, nitrogen addition and increased precipitation increased R e by 7.21%, 4.94%, 48.45% and 21.57%, respectively, while drought decreased it by 16.86%. However, the combinations of grazing with warming (GW), nitrogen addition (GN) and increased precipitation (GP) exhibited non-significant effects on R s . More importantly, additive interactions between grazing and global change factors exhibited a substantial predominance on R s , R a , R h and R e rather than synergistic and antagonistic ones. 4. Synthesis and applications. Our findings highlight the crucial importance of the interactive effects between grazing and global change factors on soil respiration (R s ) and ecosystem respiration (R e ). Therefore, incorporating this key influence on ecosystem processes into Earth system models (ESMs) could better improve the prediction of climate-biosphere feedbacks and develop sustainable strategies for grassland management in the Anthropocene. K E Y W O R D Sadditive effect, drought, grazing, increased precipitation, meta-analysis, nitrogen addition, warming

Protected areas are widely recognized as a cornerstone of biodiversity and natural resources management and sustainable development. Protected areas are a vital part of securing human prosperity and quality of life. In China, the legal framework for protected area management is scattered around various regulations. In order to better manage protected areas in China, the Chinese government has issued and revised some laws, regulations and policies on protected areas conservation and management. However, protected areas management is still facing some challenges. There is little legal literature on this issue and this paper tries to fill this gap. Firstly, it will briefly introduce the most relevant laws, regulations and policy on protected areas management. Secondly, it will analyze the recent challenges of protected areas management. Thirdly, some possible suggestions on how to better solve the recent challenges on protected areas management in China will be proposed. These suggestions include improving the management system, improving the relevant legislation, promoting public participation and establishing a diversified funding guarantee system.

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