华木莲（Sinomanglietia glauca）是国家一级重点保护植物，迄今仅发现于江西宜春市与湖南永顺县。前期研究发现，宜春华木莲种群正遭受竹林扩张的干扰，开花结实量锐减,濒危程度加剧，并推测竹林扩张引起群落小气候与土壤养分变化可能是主要原因，然而其作用机制尚不清楚。本项目拟在华木莲集中分布区江西宜春明月山开展群落结构调整与土壤养分调节控制实验，观测华木莲花芽分化、花蕾开放、坐果数量、种子活力等生殖指标和胸径、树高、枝长等营养生长指标；同时测定光合作用、养分吸收、养分浓度、内源激素等生理指标和光照、温度、相对温度等气候指标。最后分析林竹扩张对华木莲开花结实的影响并确定关键影响因子，阐明扩张强度-化学计量内平衡-开花结实的作用过程，并试从化学计量学的角度揭示毛竹扩张对华木莲开花结果的影响机制。研究成果不仅有利于华木莲这一珍稀种质资源保护，也为探索珍稀植物濒危机制提供新的思路。

Sinomanglietia glauca, a species of state key protected plant (Class I), was found only in Yichun City of Jiangxi Province and Yongshun County of Hunan Province, China. Our previous studies have found that the quantity of flowering and fruiting of S. glauca sharply decreased because of the encroachment of bamboo forests in Yichun areas. We suspected that the changes of community microclimate and soil nutrient ingredients due to the encroachment of bamboo might be the main reason. To fully understand the influence mechanisms of bamboo encroachment on S. glauca flowering and fruiting, we plan to perform an experiment on adjusting the community structure and controlling the soil nutrient ingredients in Mingyueshan Mountain, Yichun City of Jiangxi Province, in order to explore the influence of these factors on the following indicators: (i) reproductive indicators by using bud differentiation and flowering abilities, fruit quantity, seed vigor level, (ii) growth indicators by using diameter at breast height (DBH), tree height, branch length, (iii) physiological indicators by using photosynthesis rate, nutrient absorbability, concentration of nutrients, endogenous hormone levels, (iv) climatic indicators by using sunlight, temperature, relative humidity, etc. Finally, we will analyze the influence of encroachment by bamboo on flowering and fruiting of S. glauca, and we try to find the main impact factors that substantially impeded flowering and fruiting. In addition, the correlation between stoichiometry homeostasis and reproduction status would be expected to be elucidated, and the influence mechanism of encroachment of bamboo on blossoming of S. glauca is expected to be also revealed from the perspective of ecological stoichiometry. Research findings would not only be helpful for S. glauca conservation, but also provide an insight to the endangering mechanism for the rare and endangered plant species.