Grass trait–abundance relationships and the role of the functional composition of the neighboring community
Grass trait–abundance relationships and the role of the functional composition of the neighboring community
复制标题
草类性状-丰度关系及邻近群落功能组成的作用
DOI：
10.1111/jvs.13181
复制
发表时间：
2023
影响因子：
2.8
通讯作者：
Sandel, Brody
中科院分区：
文献类型：
--
作者：
Griffin‐Nolan, Robert J.;Sandel, Brody
问题植物性状可以预测物种的相对丰度及其对生态系统过程的影响。然而，一个物种的特征表达和相对丰度也受到其非生物和生物环境的影响。在这里，我们问植物性状和相对丰度之间的关系是否被非生物因素(如气候和地形)和生物因素(如群落分类和功能多样性)所改变。地点旧金山湾区。方法我们测量了117个样地19种草本植物的比叶面积(SLA；叶面积/干质量)和株高。我们还量化了每个物种的相对丰富度以及邻近草类群落的几个生物属性，包括总植物盖度、物种丰富度和均匀度、群落加权平均(CWM)特征和功能多样性。通过多元线性回归，我们评估了是否可以从性状以及性状与生物和非生物因素之间的交互作用来预测丰度。根据相对丰度预测性状的模型相似。结果草种的相对丰度在其高度较高和SLA较高的样地中较高。在功能丰富度低(FRIC)和功能均匀度(FEVE)较高的群落中，它们的数量也较多，这可能是由于其邻居的资源利用效率较低，缺乏优势草种所致。丰度和株高都与非生物变量无关，尽管SLA根据钟形曲线对降水做出了可预测的响应。牧草越多，其高度越高，但丰富度对SLA的影响取决于群落Feve。最后，我们发现了群落特征相似性的有力证据，即个体的特征表达与其邻近牧草的特征呈正相关。结论综合这些结果，这些特征可以预测丰富度，反之亦然，这些关系更依赖于生物相互作用而不是气候。
QuestionsPlant traits can predict a species‘ relative abundance and its influence on ecosystem processes. However, trait expression and the relative abundance of a species are also influenced by its abiotic and biotic environment. Here, we ask whether the relationship between plant traits and relative abundance is modified by abiotic (e.g., climate and topography) and biotic factors (e.g., community taxonomic and functional diversity) across Californian grasslands.LocationSan Francisco Bay Area.MethodsWe measured specific leaf area (SLA; leaf area/dry mass) and plant height of 19 grass species (family: Poaceae) across 117 plots. We also quantified the relative abundance of each species as well as several biotic attributes of the neighboring grass community including total plant cover, species richness and evenness, community‐weighted mean (CWM) traits, and functional diversity. Using multiple linear regression, we assessed whether abundance could be predicted from traits and the interactions between traits and both biotic and abiotic factors. We fit similar models predicting traits from relative abundance.ResultsGrass species had higher relative abundance in plots where they were taller and had higher SLA. They were also more abundant in communities with low functional richness (FRic) and high functional evenness (FEve), perhaps because of the low resource‐use efficiency of their neighbors and a lack of dominant grasses. Neither abundance nor plant height were associated with abiotic variables, although SLA responded predictably to precipitation according to a bell‐shaped curve. Grasses were taller where they were more abundant, but the impact of abundance on SLA depended on community FEve. Finally, we show strong evidence for community trait similarity, whereby an individual‘s trait expression was positively correlated with the traits of its grass neighbors.ConclusionsTaken together, these results imply that traits are predictive of abundance and vice versa, and these relationships depend on biotic interactions more than climate.