Li Ma, Xinna Zhang, Huaijiang He, Juan Wang, Xiuhai Zhao, Klaus von Gadow, Chunyu Zhang
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树种生长与死亡之间的种间权衡是植物生活史策略的一个关键维度。大气氮沉降和气候变化正在改变森林种群动态,但它们对树苗生长-死亡权衡的相互作用仍知之甚少。在这项研究中,我们对中国东北12种温带树种的39,366棵树苗进行了为期5年的施氮试验。我们测试了氮添加和气候如何共同改变人口比率及其权衡。我们实施了一个因子N添加实验(0、50和100 kg N ha−1年−1年),并评估了气候变化、功能性状、土壤性质、地形和邻里竞争对树苗性能的影响。低N添加量分别使相对生长率提高了12.5%(样地群落水平)、6.7%(物种水平)和13.3%(个体水平),但死亡率没有增加,而高N添加量使死亡率提高了23.7%,但没有显著提高生长,这表明物种在生长-死亡权衡空间中的位置发生了变化。值得注意的是,我们发现了N添加与气候之间的非加性相互作用:降水增加抑制了N诱导的生长增益,但增加了死亡率,而变暖进一步限制了N添加下的生长响应。在所有氮处理下均观察到种间生长-死亡权衡,但其强度因氮添加水平而异,在低氮添加时减弱,在高氮添加时部分重新增强。功能性状是生长-死亡权衡的主要近似驱动因素,介导了氮添加和气候对这种人口关系的部分间接影响。合成。总的来说,我们的研究结果表明,氮富集通过改变性状介导的资源分配和对气候胁迫的生理敏感性来重塑树苗的生活史策略,从而重新配置全球变化下的生长-死亡权衡。
期刊介绍:
Journal of Ecology publishes original research papers on all aspects of the ecology of plants (including algae), in both aquatic and terrestrial ecosystems. We do not publish papers concerned solely with cultivated plants and agricultural ecosystems. Studies of plant communities, populations or individual species are accepted, as well as studies of the interactions between plants and animals, fungi or bacteria, providing they focus on the ecology of the plants.
We aim to bring important work using any ecological approach (including molecular techniques) to a wide international audience and therefore only publish papers with strong and ecological messages that advance our understanding of ecological principles.