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首页> 美国卫生研究院文献>Frontiers in Plant Science >Interspecific coordination and intraspecific plasticity of fine root traits in North American temperate tree species
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Interspecific coordination and intraspecific plasticity of fine root traits in North American temperate tree species

机译：北美温带树种优良根系性状的种间协调和种内可塑性

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Fine roots play an important role in nutrient and water absorption and hence overall tree performance. However, current understanding of the ecological role of belowground traits lags considerably behind those of aboveground traits. In this study, we used data on specific root length (SRL), fine root diameter (D) and branching intensity (BI) of two datasets to examine interspecific trait coordination as well as intraspecific trait variation across ontogenetic stage and soil conditions (i.e., plasticity). The first dataset included saplings of 12 North American temperate tree species grown in monocultures in a common garden experiment to examine interspecific trait coordination. The second dataset included adult and juvenile individuals of four species (present in both datasets) co-occurring in natural forests on contrasting soils (i.e., humid organic, mesic, and xeric podzolic).The three fine root traits investigated were strongly coordinated, with high SRL being related to low D and high BI. Fine root traits and aboveground life-strategies (i.e., relative growth rate) were weakly coordinated and never significant. Intraspecific responses to changes in ontogenetic stage or soil conditions were trait dependent. SRL was significantly higher in juveniles compared to adults for Abies balsamea and Acer rubrum, but did not vary with soil condition. BI did not vary significantly with either ontogeny or soil conditions, while D was generally significantly lower in juveniles and higher in humid organic soils. D also had the least total variability most of which was due to changes in the environment (plasticity). This study brings support for the emerging evidence for interspecific root trait coordination in trees. It also indicates that intraspecific responses to both ontogeny and soil conditions are trait dependent and less concerted. D appears to be a better indicator of environmental change than SRL and BI.
机译：细根在养分和水分吸收以及树的整体性能中起重要作用。但是，目前对地下性状的生态作用的认识远远落后于地下性状。在这项研究中，我们使用了两个数据集的比根长（SRL），细根直径（D）和分支强度（BI）的数据，研究了种间性状的协调以及在个体发育阶段和土壤条件下种内性状的变异（即可塑性）。第一个数据集包括在共同的花园实验中研究单一栽培中生长的12种北美温带树种的树苗，以检查种间性状的协调性。第二个数据集包括四种自然环境下在对比土壤（即潮湿的有机，中度和干燥的坡地）上同时存在的四种物种的成人和少年个体（均存在于这两个数据集中）。高SRL与低D和高BI有关。优良的根性状和地上生活策略（即相对生长率）协调不力，从不显着。种内对个体发育阶段或土壤条件变化的反应取决于性状。相对于成年冷杉（Abies balsamea）和红槭（Acer rubrum），幼鱼的SRL显着高于成年人，但随土壤状况而变化。 BI在个体发育或土壤条件下均无显着变化，而D在幼虫中通常显着较低，而在潮湿有机土壤中则较高。 D也具有最小的总变异性，其中大部分是环境变化（可塑性）引起的。这项研究为树木种间根性状协调的新证据提供了支持。这也表明种内对个体发育和土壤条件的反应是性状依赖性的，并且不太协调。与SRL和BI相比，D似乎是更好的环境变化指标。

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