Temporal stability of grassland metacommunities is regulated more by community functional traits than species diversity
Temporal stability of grassland metacommunities is regulated more by community functional traits than species diversity
复制标题
草地群落的时间稳定性更多地受到群落功能性状的调节，而不是物种多样性的调节
DOI：
10.1002/ecs2.3178
复制
发表时间：
2020
期刊：
影响因子：
2.7
通讯作者：
P. Fay
中科院分区：
文献类型：
--
作者：
H. W. Polley;Chenghai Yang;B. Wilsey;P. Fay
地上净初级生产力(ANPP)的时间稳定性受植物群落的几个属性的影响。确定稳定的主要调节因素及其在空间尺度上的作用具有重要的实践和理论意义。我们研究了物种多样性(局部或α多样性和群落间物种差异性)以及群落功能属性(平均地上生物量和群落叶干物质含量，LDMC)的空间差异对恢复草地春季净初级生产力时间稳定性的影响。通过对两种土壤类型草地冠层反射率的遥感测量，得到了生物量、群落LDMC和物种差异性。结果表明，在较大的空间尺度上，元群落(通过扩散连接的群落)的生产力更多地受到群落功能特征的空间差异的稳定，而不是多样性或群落多样性的差异。群落生物量和LDMC的空间差异通过增加空间上不同的群落对降水年际变化的生产力响应的差异来稳定集合群落的生产力，但通过降低当地群落的时间稳定性来降低一种土壤类型上的ANPP的稳定性。我们的结果证明了遥感在量化群落属性方面的有效性，这些属性有助于评估或预测草地ANPP的时间稳定性。我们得出结论，生产力的时间稳定性在很大程度上取决于群落在功能属性上的差异，这些属性将植物生长与资源可获得性的变化联系在一起。
Temporal stability in aboveground net primary productivity (ANPP) is influenced by several attributes of plant communities. Identifying the primary regulators of stability and their roles across spatial scales is of both practical and theoretical importance. We assessed effects of species diversity (local or alpha diversity and species dissimilarity between local communities) together with spatial differences in two community functional attributes (mean aboveground biomass and community leaf dry matter content, LDMC) on temporal stability in spring ANPP of restored grassland. Biomass, community LDMC, and species dissimilarity were derived from remote measurements of canopy reflectance of grassland on two soil types. Results demonstrated that productivity at the larger spatial scale of the metacommunity (communities connected by dispersal) was stabilized more by spatial differences in community functional traits than by diversity or community differences in diversity. Spatial differences in community biomass and LDMC stabilized metacommunity productivity by increasing differences in the productivity responses of spatially distinct communities to interannual variation in precipitation, but de-stabilized ANPP on one soil type by reducing the temporal stability of local communities. Our results demonstrate the utility of remote sensing for quantifying community attributes useful to assess or predict temporal stability of grassland ANPP. We conclude that temporal stability in productivity depended largely on community differences in functional attributes that couple plant growth to changes in resource availability.