Tree mycorrhizal type mediates conspecific negative density dependence effects on seedling herbivory, growth, and survival.
Tree mycorrhizal type mediates conspecific negative density dependence effects on seedling herbivory, growth, and survival.
复制标题
树菌根类型介导对幼苗食草、生长和存活的同种负密度依赖性效应。
DOI：
10.1007/s00442-022-05224-6
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
María Natalia Umaña
中科院分区：
文献类型：
--
作者：
Pu Xucai;Monique Weemstra;Jin Guangze;María Natalia Umaña
树木菌根类型通过其在同种负密度依赖（CNDD）中的介导作用，即，由于同种植物的密度而使个体的表现受到损害的过程。以往的研究结果表明，外生菌根（EM）树种一般不太容易受到CNDD比丛枝菌根（AM）树种，由于化学和物理保护，EM真菌提供给他们的主机。我们研究了如何CNDD影响叶草食性，幼苗生长，和生存之间的AM和EM幼苗收集超过3年的10个树种在中国东北古老的温带森林。我们发现，AM和EM幼苗不同的同种密度如何影响他们的叶植食性，幼苗生长和生存。AM幼苗叶片取食率随同种幼苗和成虫密度的增加而显著增加，其生长和存活率随同种成虫密度的增加而降低，而EM幼苗则不存在这种规律。我们的工作表明，AM幼苗相对于EM幼苗具有与同种邻居的负面影响相关的性能劣势。我们强调了整合信息的重要性，幼苗叶植食性，幼苗生长，提供进一步了解潜在的机制驱动AM和EM树幼苗之间的差异CNDD。
Tree mycorrhizal type plays an important role in promoting plant species diversity and coexistence, via its mediating role in conspecific negative density dependence (CNDD), i.e., the process by which an individual's performance is impaired by the density of conspecific plants. Previous findings suggest that ectomycorrhizal (EM) tree species are generally less susceptible to CNDD than arbuscular mycorrhizal (AM) tree species, due to the chemical and physical protection that EM fungi provide their host with. We examined how CNDD effects on leaf herbivory, seedling growth, and survival differ between AM and EM seedlings of ten tree species collected over 3 years in an old-growth temperate forest in northeastern China. We found that AM and EM seedlings differed in how conspecific density affected their leaf herbivory, seedling growth, and survival. Specifically, AM seedlings leaf herbivory rates significantly increased with increasing conspecific seedling and adult density, and their growth and survival rates decreased with increasing conspecific adult density, these patterns were, however, absent in EM seedlings. Our work suggests that AM seedlings have a performance disadvantage relative to EM seedlings related to the negative effects from conspecific neighbors. We highlight the importance of integrating information on seedling leaf herbivory, seedling growth, to provide further understanding on potential mechanisms driving differences in CNDD between AM and EM tree seedlings.