种子库是森林生态研究的重要内容，有助于认识森林种群动态与自然更新过程。热带雨林土壤高温高湿，土壤中的种子容易发霉死亡。但有一些种子却能存活下来，形成种子库，它们存活的机制是什么？目前处在学说阶段，最被接受的学说有"种子内源化学防御说"和"种子外源有益微生物化学防御学说"，但需要有效的案例验证。种子在土壤中，无论是休眠状态，还是待萌发的静止状态，它们的存活机制与种子库土壤理化性质及微生物活动情况有着必然的联系。本项目在完成林窗促进土壤种子库萌芽的机制研究基础上，拟通过以休眠种子（大花五桠果、高枝杜英）和静止待萌发种子（乌墨、猴耳环）为目标种子，在热带雨林土壤中和实验室无菌条件下开展这些种子的存活对比实验，探索这两类种子在土壤中存活状况与土壤理、化及微生物特征的关系，进而筛选影响的主导因子，进行人工控制实验，分析这两类种子在土壤中存活与它们变化的定理关系，达到揭示种子在土壤中存活机制的目的。

Survival of seeds in the soil seed bank is important for the forest dynamics and natural regeneration, the habital factors that affected the seed survival at forest ecosystem level remain poorly understood. It was hypothesized that seeds of the soil seed bank may prevent lethal infection from external conditions and survived via two hypothetic mechanisms of "endogenous chemical defences of seeds" and "exotic chemical defences of beneficial seed-microbial associations", nevertheless further researchs are needed for these theories being verified. Especially，more researchs are needed concerning the habital condition affecting seed survival under artificial controlled conditions. There are two community types of germination of:(1) Germination inhibited without the external condition influence over a quiescence period; (2)Germination under favorable environmental conditions allowed to successfully exit a dormant state. Dormancy generates a seed bank. It is proposed that the individual seed variety and survival time are closely linked to the ecological conditions of a plant's habitat. In this project, we will investigate the mechanism of seed survival in soil seed bank by the habitat traits of soil seed banks and its relationship with seed survival. The dormancy seeds (Dillenia turbinata and Elaeocaepus dubius) without physical barriers and quiescence seeds (Syzygium cumini and Archidendron clypearia) were selected to verify these theories. The variation in soil habitat traits for the seed banks which comprises physical, chemical and microbial characters were explored. Meanwhile, primary ecological factors affecting seed survival in the soil were determined according to the experimental data analysis. Verification experiments will be carried out under those controlled fators. The variation rule of habitat traits of soil seed banks and its relationship with seed survival concerning the above mentioned plants will be studied and examples of the diverse plant seeds survival mechanism would be disclosed finally.