植物经济谱对植物残体碳和养分元素释放速率的影响

植物经济谱理论在探讨植物体构建的资源利用策略时已取得重大进展，却在探讨其对植物残体分解过程的影响时遭遇困境。在植物残体分解过程中，土壤动物作用巨大，但其作用具有取食偏好及较强的随机性，对阐明植物经济谱与分解速率的关系有强烈干扰。由于以往研究都忽视了土壤动物的干扰，导致研究结论存在严重分歧。当前有个别研究间接表明，在无土壤动物干扰时能发现植物经济谱对植物残体分解有强烈影响，因而亟待针对性的研究对此进行直接验证。此外，以往研究主要关注植物经济谱与分解速率的关系，而忽略了其对养分元素释放的影响。因此，本项目拟利用苍山丰富的植物种类资源，分析该区域植物叶和细根的经济谱特征，在此基础上选取苍山植物经济谱上具有代表性的叶和细根进行野外分解。通过设置允许和不允许土壤动物参与分解的处理，研究植物经济谱对植物残体碳和氮磷养分释放速率的影响。项目的实施将为认识植物经济谱对植物残体分解过程的影响作出关键突破。

Important progresses had been made for applying the plant economics spectrum (PES) theory to explore resources strategies of plant organism construction, whereas dilemma was encountered when investigating the impacts of PES on the process of plant detritus decomposition. During the process of plant detritus decomposition, soil fauna exerts considerable effects on the decomposition rate. However, the effects of soil fauna are characterized by feeding preference and great randomness, which impose intensive disturbances on elucidating the relationship between PES and decomposition rate. Because all of the previous studies overlooked the disturbances caused by soil fauna, drastic divergences were brought about on the study conclusions. On the other hand, a couple of studies indicated indirectly that significant impacts of PES on plant detritus decomposition could be observed when there were no disturbances from soil fauna, and thus specific studies are in urgent needed to verify this phenomenon directly. In addition, previous studies focused mainly on the connections between PES and decomposition rate, the impacts of PES on the release of nutrient elements from plant detritus, however, were overlooked. Therefore, the present project attempt to take advantage of the rich species resources of plants in the Cangshan mountain, analyze the PES of leaves and fine roots of this region, and then conduct a filed decomposition experiment with leaves and fine roots from plant species which are representative on the PES of Cangshan mountain ecosystem. By setting up treatments with and without soil fauna participating in decomposition process, we will investigate the impacts of PES on the release rate of carbon and nitrogen and phosphorus nutrients from plant detritus. The implementation of this project will make crucial breakthrough for understanding the impacts of PES on the process of plant detritus decomposition.