草原灌木入侵后冠层下草本植物叶部病害的温度依赖性变化
Temperature-dependent variations in under-canopy herbaceous foliar diseases following shrub encroachment in grasslands.
作者信息
Dang Yilin, Zhang Peng, Jiang Peixi, Ke Junsheng, Xiao Yao, Zhu Yingying, Liu Mu, Li Minjie, Wu Jihua, Liu Jianquan, Tian Bin, Liu Xiang
机构信息
State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Ecology, Lanzhou University, Lanzhou, China.
National Plateau Wetlands Research Center and Yunnan Key Laboratory of Plateau Wetland Conservation Restoration and Ecological Services, Southwest Forestry University, Kunming, China.
出版信息
Nat Commun. 2025 Jan 28;16(1):1131. doi: 10.1038/s41467-025-56439-z.
Shrub encroachment into grasslands poses a global concern, impacting species biodiversity and ecosystem functioning. Yet, the effect of shrub encroachment on herbaceous diseases and the dependence of that effect on climatic factors remain ambiguous. This study spans over 4,000 km, examining significant variability in temperature and precipitation. Our findings reveal that herbaceous plant species richness diminishes the pathogen load of foliar fungal diseases of herbaceous plants in both shrub and grassland patches. Temperature emerges as the primary driver of variations in herbaceous biomass and pathogen load within herbaceous plant communities. Disparities in herbaceous biomass between shrub and grassland patches elucidate changes in pathogen load. In colder regions, shrub encroachment diminishes herbaceous biomass and pathogen load. Conversely, in warmer regions, shrubs either do not reduce or even amplify pathogen load. These discoveries underscore the necessity for adaptive management strategies tailored to specific shrub encroachment scenarios.
灌木侵入草原是一个全球性问题，影响着物种生物多样性和生态系统功能。然而，灌木侵入对草本植物病害的影响以及这种影响对气候因素的依赖性仍不明确。本研究跨越4000多公里，考察了温度和降水的显著变异性。我们的研究结果表明，草本植物物种丰富度降低了灌木和草原斑块中草本植物叶部真菌病害的病原体负荷。温度是草本植物群落中草本生物量和病原体负荷变化的主要驱动因素。灌木和草原斑块之间草本生物量的差异解释了病原体负荷的变化。在较寒冷的地区，灌木侵入会减少草本生物量和病原体负荷。相反，在较温暖的地区，灌木要么不会降低，甚至会增加病原体负荷。这些发现强调了针对特定灌木侵入情况制定适应性管理策略的必要性。
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