As a critical global ecosystem,grasslands rely on complex aboveground-belowground interactions that underpin multifunctionality,yet their mechanisms remain poorly understood.Our investigation employed the plateau pika...As a critical global ecosystem,grasslands rely on complex aboveground-belowground interactions that underpin multifunctionality,yet their mechanisms remain poorly understood.Our investigation employed the plateau pika(Ochotona curzoniae),a small herbivore widely distributed throughout the Qinghai-Tibetan Plateau,as a model organism to examine the consequences of disturbance on plant diversity,soil properties,microbial diversity,and multifunctionality of grassland ecosystems.We found that high pika burrow density significantly reduced plant diversity(Shannon-Wiener and Chao1 indices)and aboveground biomass.It also increased soil pH and reduced ammonium nitrogen content.The soil microbial diversity,encompassing both bacteria and fungi,was markedly decreased in areas characterized by a high concentration of burrows.Microbial interaction networks demonstrated greater complexity in areas with high burrow densities,as revealed by the network analysis.Conversely,in regions characterized by low burrow density,a significant negative correlation was observed between the intricacy of soil bacterial networks and the multifunctionality of grassland ecosystems.Structural equation modelling showed that pika disturbance indirectly affected multifunctionality via changes in plant biomass and soil properties-notably,nitrate nitrogen explained 40%of multifunctionality variation under high disturbance.This investigation advances our understanding of complex aboveground-belowground linkages in grassland ecosystems,revealing novel mechanisms through which biodiversity governs ecosystem multifunctionality.Our findings underscore the critical role of small herbivores in shaping grassland ecosystem functions and emphasize the importance of maintaining balanced disturbance regimes to sustain ecosystem multifunctionality.This has immediate implications for global conservation policies on the Qinghai-Tibetan Plateau and analogous ecosystems.展开更多
野生动物繁殖调控是动物生态学研究的核心问题之一,其目的是通过研究调控动物个体及种群繁殖因素,揭示物种繁殖调控和生存规律(孙儒泳等,1997;Zenuto et al.,2001)。一般而言,雌性生殖细胞生殖能力的获得需经历卵泡发育和卵子发生两个过...野生动物繁殖调控是动物生态学研究的核心问题之一,其目的是通过研究调控动物个体及种群繁殖因素,揭示物种繁殖调控和生存规律(孙儒泳等,1997;Zenuto et al.,2001)。一般而言,雌性生殖细胞生殖能力的获得需经历卵泡发育和卵子发生两个过程,而这两个相互依存的过程皆在发情周期完成。发情周期的启动为雌雄配子相互结合及下一代个体发育奠定基础(张嘉保和田见晖,2011)。展开更多
基金supported by the National Natural Science Foundation of China(32471603)Science and Technology Commissioner Special Project of Qinghai Province(2025-NK-P42)+2 种基金Central Financial Funds for Forestry and Grassland Reform and Development in 2024(2024-TG16)Hainan Tibetan Autonomous Prefecture Science and Technology Program Project(2025-KH01-B)the leading Kunlun talents in Qinghai Province.
文摘As a critical global ecosystem,grasslands rely on complex aboveground-belowground interactions that underpin multifunctionality,yet their mechanisms remain poorly understood.Our investigation employed the plateau pika(Ochotona curzoniae),a small herbivore widely distributed throughout the Qinghai-Tibetan Plateau,as a model organism to examine the consequences of disturbance on plant diversity,soil properties,microbial diversity,and multifunctionality of grassland ecosystems.We found that high pika burrow density significantly reduced plant diversity(Shannon-Wiener and Chao1 indices)and aboveground biomass.It also increased soil pH and reduced ammonium nitrogen content.The soil microbial diversity,encompassing both bacteria and fungi,was markedly decreased in areas characterized by a high concentration of burrows.Microbial interaction networks demonstrated greater complexity in areas with high burrow densities,as revealed by the network analysis.Conversely,in regions characterized by low burrow density,a significant negative correlation was observed between the intricacy of soil bacterial networks and the multifunctionality of grassland ecosystems.Structural equation modelling showed that pika disturbance indirectly affected multifunctionality via changes in plant biomass and soil properties-notably,nitrate nitrogen explained 40%of multifunctionality variation under high disturbance.This investigation advances our understanding of complex aboveground-belowground linkages in grassland ecosystems,revealing novel mechanisms through which biodiversity governs ecosystem multifunctionality.Our findings underscore the critical role of small herbivores in shaping grassland ecosystem functions and emphasize the importance of maintaining balanced disturbance regimes to sustain ecosystem multifunctionality.This has immediate implications for global conservation policies on the Qinghai-Tibetan Plateau and analogous ecosystems.
文摘野生动物繁殖调控是动物生态学研究的核心问题之一,其目的是通过研究调控动物个体及种群繁殖因素,揭示物种繁殖调控和生存规律(孙儒泳等,1997;Zenuto et al.,2001)。一般而言,雌性生殖细胞生殖能力的获得需经历卵泡发育和卵子发生两个过程,而这两个相互依存的过程皆在发情周期完成。发情周期的启动为雌雄配子相互结合及下一代个体发育奠定基础(张嘉保和田见晖,2011)。
