养分供应比例和动态对积水凤梨生长速率的影响

Effects of nutrient supply (ratio and dynamics) on plant relative growth rate (RGR) has been a difficult problem in ecology study. RGR of plants is influenced by soil nutrient availability, above- and below-ground distribution and plant nutrient strategy, as a result, plant RGR is often quite different from theoretical forecast. In order to solve these problems, 6 species of Epiphytic Bromelioideae were selected as our research objects. Because nutrient of Bromelioideae mainly relies on precipitation, the root only plays a fixed role, so its RGR will not affected by soil availability and aboveground - belowground distribution. It is an ideal object to test nutrient limitation and growth rate hypothesis. Bromelioideae is also an expensive ornamental flowers, but its slow growth rate led to high prices. In this study, we conduct multi - factor interaction experiment and nutrient pulse supply experiment to determine the main limiting factor among Bromelioideae growth stages, reveal the main influencing factors of RGR and explore the response of Bromelioideae to different types of nutrient pulsed supply.This study can provide systematic theoretical guidance for improving RGRmax of Bromelioideae and improving the cultivation technology.

养分供应比例和动态对植物相对生长速率(RGR)的影响，一直是生态学的难点问题。植物受到土壤养分有效性、地上-地下分配和自身养分利用策略的影响，其RGR与理论预测有较大出入。本研究为解决以上问题，选择了附生植物积水凤梨亚科(Bromelioideae)的6个品种作为研究对象，由于积水凤梨主要依靠降水淋溶获得养分，根系仅起固定作用，不受到土壤有效性和地上-地下分配的影响，是检验养分限制和生长率假说的理想对象。积水凤梨也是名贵的观赏花卉，具有极高观赏价值，但生长缓慢导致价格高昂。本研究拟通过多因子交互实验和养分脉冲供应实验，明确积水凤梨幼苗生长发育各个阶段的主要限制因子，揭示积水凤梨RGR的主要影响因素，发掘积水凤梨对不同类型的养分脉冲式供应的响应。本研究能够为提高积水凤梨生长潜力，改进积水凤梨栽培技术提供系统的理论指导。

积水凤梨是名贵的观赏花卉，具有极高观赏价值，但生长缓慢导致价格高昂。为解决以上问题，研究者选择了积水凤梨亚科的6个代表品种作为研究对象，通过多因子交互实验、养分脉冲供应实验和光照-养分耦合试验，明确了积水凤梨生长的主要限制因子由养分和水分转化为光因子的过程，总结了积水凤梨的养分限制状态及对不同养分供应水平的响应机制。本研究能够为提高积水凤梨生长潜力，改进积水凤梨栽培技术提供系统的理论指导。