目的 探讨大别山山核桃天然种群的表型多样性，为种质资源收集、优选、改良提供理论支持，为大别山山核桃的开发利用奠定基础。 方法 从19个大别山山核桃天然种群中选取198个单株，测定其果实和叶片的表型性状共16个，采用巢式方差分析，单因素方差分析，相关性分析，非加权配对算数平均法（UPGMA）等方法揭示大别山山核桃表型性状与地理分布的关系及其变异规律。 结果 （1）大别山山核桃的16个表型性状在种群间和种群内均存在极显著差异（P <0.01），表明大别山山核桃的表型多样性非常丰富；（2）各表型性状的变异范围为1.64%～26.59%，平均变异系数为9.63%；果实表型与叶片表型的种群内平均变异系数分别为6.16%和15.42%，果实表型平均变异系数较小，性状相对稳定；（3）表型性状间的相关性分析表明，性状间达极显著相关的有60对，达显著相关的11对；（4）种群间和种群内的平均方差分量百分比分别为49.28%和17.53%,平均表型分化系数为66.25%，表明大别山山核桃表型变异主要来自种群间；（5）当距离系数为 0.04时，19个种群被分为4类，聚类情况基本与经度的变化一致。

In this study, the rhizosphere soil properties of Takyr Solonetzs ameliorated with FGDG, and its effect on root growth of Lycium barbarum were studied. The results indicated that with increasing applications of FGDG, the contents of Na+, K+, Mg2+, Cl-, and HCO3- in rhizosphere soil decreased gradually with the ratio of 51.9%, 16.7%, 42.7%, 44.7% and 28.2%, respectively, while the contents of Ca2+ and SO42- showed an increasing trend and increased by 96.9% and 80.4% compared with those of the CK. As the content of exchangeable Na+ decreased with the increasing application of FGDG, the exchangeable sodium percentage (ESP) and soil pH values decreased from 32.2% and 10.5 to 18.1% and 7.82, respectively and thus the soil physical properties improved. However, the lowest total salt content (2.91 g·kg-1) was found in T2 (2.5 t/(667m2)), and similarly, the highest values of taproot length (44.78 cm), root surface area(179.97 cm2) and root dry weight (17.53 g) were also found in T2, which suggested that applications of FGDG were not always positively correlated with soil reclamation, and excessive amount of FGDG would inhibit root’s growth. Overall, application of FGDG is effective in ameliorating Takyr Solonetzs, but high amount of FGDG would result in excess salts against root growth and subsequently influence production.

采用受威胁系数、遗传价值系数、利用价值系数、保护现状系数和名录现状系数构成的优先保护评价指标体系对中国东北濒危植物进行定量分析和综合评价,得到濒危植物优先保护值并确定其优先保护等级。结果表明,东北地区共有濒危植物60种,隶属于25科42属,优先保护值范围在0.853 8 0.318 4之间。依据优先保护值将濒危植物划分3级,一级保护有17种,隶属于11科15属,二级保护有18种,隶属于11科14属,三级保护有25种,隶属于13科17属。