Results of univariate models.

AW is Akaikes weight which is the probability of model I being the best model explaining variation in average annual productivity. The presence of a nitrogen fixer was the best single variable model, followed by phylogenetic diversity, variation in seed weight, and log of the number of plant species. Rank indicates model ranking from Mallow's Cp.

AW即赤池权重（Akaike Weight），指模型i为解释年均生产力变异的最优模型的概率。固氮生物的存在是表现最优的单变量模型，其余依次为系统发育多样性、种子重量变异以及植物物种数的对数值。Rank字段代表基于马洛斯Cp统计量（Mallow's Cp）得到的模型排序。