Plant community-mediated effects of grazing on plant diseases.
Plant community-mediated effects of grazing on plant diseases.
复制标题
植物群落介导的放牧对植物病害的影响。
DOI：
10.1007/s00442-022-05223-7
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发表时间：
2022
期刊：
影响因子：
2.7
通讯作者：
Yuping Wu
中科院分区：
文献类型：
--
作者：
Tserang Donko Mipam;Fei Chen;Liming Tian;Pei Zhang;Mengjiao Huang;Lifan Chen;Xingxing Wang;Peng Zhang;Ziyuan Lin;Yuping Wu
放牧是草地最重要的管理措施之一。迄今为止，大多数关于放牧如何影响植物病害的研究都集中在单一的植物物种上，忽略了植物群落特征和植物发生。利用青藏高原高寒草甸生态系统牦牛放牧试验（0、1、2、3头牦牛ha - 1处理）6年的数据，从种群和群落两个层次上研究了放牧对牦牛叶部真菌病的影响。通过测量植物群落变量（包括丰富度，均匀度，系统发育多样性和组成）和疾病的严重程度，我们评估了牦牛放牧对群落病原菌负荷的植物群落介导的影响的相对重要性与多模型推理方法。我们发现不同放牧处理之间的病原菌负荷显着差异，我们记录了最高和最低的病原菌负荷在1牦牛公顷-1治疗和3牦牛公顷-1治疗，分别。Pielou均匀度指数和群落倾向性（即，对植物群落支持疾病能力的估计）最能解释病原体负荷的变化，表明牦牛放牧的植物群落介导效应（通过均匀性和倾向性）决定了病原体负荷。我们的研究提供了经验证据表明，放牧通过植物群落均匀度和组成影响叶面真菌病害的流行，这表明将宿主植物群落特征纳入疾病负荷预测框架的必要性。
Grazing is one of the most important management practices for grasslands. To date, most studies on how grazing affects plant diseases have focused on a single plant species, ignoring plant community characteristics and phylogeny. We used data from a 6-year yak grazing experiment (0, 1, 2, and 3 yak(s) ha - 1 treatment) in an alpine meadow ecosystem of Qinghai-Tibetan Plateau, from which we tested grazing effects on foliar fungal diseases at both population and community levels. By measuring plant community variables (including richness, evenness, phylogenetic diversity, and composition) and disease severity, we evaluated the relative importance of plant community-mediated effects of yak grazing on community pathogen load with a multi-model inference approach. We found significant differences in pathogen load among different grazing treatments; we recorded the highest and lowest pathogen loads in the 1 yak ha - 1 treatment and in the 3 yaks ha - 1 treatment, respectively. Pielou's evenness index and community proneness (i.e., an estimate of the capacity of plant communities to support diseases) best explained variation in pathogen load, indicating that plant community-mediated effects (through evenness and proneness) of yak grazing determined pathogen load. Our study provides empirical evidence that grazing influences foliar fungal disease prevalence through plant community evenness and composition, which demonstrates the necessity of incorporating host plant community characteristics into disease load prediction frameworks.