With data from 15 species in eight families of tropical dry forest trees, we provide evidence of coordination between the stem and leaf economic spectra. Species with low-density, flexible, breakable, hydraulically efficient but cavitationally vulnerable wood shed their leaves rapidly in response to drought and had low leaf mass per area and dry mass content. In contrast, species with the opposite xylem syndrome shed their costlier but more drought-resistant leaves late in the dry season. Our results explain variation in the timing of leaf shedding in tropical dry forests: selection eliminates combinations such as low-productivity leaves atop highly vulnerable xylem or water-greedy leaves supplied by xylem of low conductive efficiency. Across biomes, rather than a fundamental trade-off underlying a single axis of trait covariation, the relationship between leaf and stem economics is likely to occupy a wide space in which multiple combinations are possible.

译文

:利用来自八个热带干旱林木科的15种物种的数据,我们提供了茎叶经济谱之间协调的证据。具有低密度,柔韧性,易碎性,水力效率高但易受气蚀影响的木材,由于干旱而迅速脱落,并且每单位面积的叶片质量和干燥质量含量较低。相反,在干燥季节后期,具有相反木质部综合症的物种脱落了昂贵但抗干旱的叶片。我们的结果解释了热带干旱森林中叶片脱落时间的变化:选择消除了诸如脆弱的木质部顶部的低生产力叶片或导电效率低的木质部提供的水贪婪叶片等组合。在整个生物群落中,叶片经济与茎经济学之间的关系可能占据着广阔的空间,在其中可能存在多种组合,而不是在性状协变的单轴基础上进行基本权衡。

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