In order to select the poplar clones suitable to be planted on the beach land of Yangtse River, twenty clones of poplar were cultivated on the beach land in Ma’anshan City, Anhui province, China. The growth, survival rate and lodging situation of each clone were measured three years after planting, and their comprehensive performances were evaluated by improved Analytic Hierarchy Process (AHP). The result showed that the growth (including diameter at breast height, height and volume), survival rate, height under the branches and tilt angle were significantly different among these four-year-old poplar clones. The integrated evaluation showed that the comprehensive qualities of poplar clones were significantly different. The integrated values of poplar clone 895, clone 324 and clone 1388 were higher, and the integrated values of clones 447, clone 136 and clone 316 were lower than the others. This indicated that the performances of four-year-old clone 895, clone 324 and clone 1388 were better than that of the other clones, and the three poplar clones could be selected to plant on the beach land of Yangtse River.

通过对马尾松4 - 20年生不同密度的人工同龄纯林生长资料的分析表明:第1次树高生长分化高峰期在4 - 7年生,第2次在11 - 14年生,幼林郁闭后林木直径分化状态比较稳定。中幼林期抚育间伐主要采伐劣等木,进入近熟林期后除采伐劣等木外,还可采伐一部分中等木。间伐施工应以留优去劣为主,适当照顾均匀。总稀疏强度与密度呈正相关性,出现稀疏的时间随密度增大而提前;连年稀疏强度高峰期出现在林分郁闭后的一段时间内。根据总稀疏强度与稀疏时间同密度的关系可确定不同密度林分的间伐强度与时间。利用马尾松人工林观测资料拟合出与立地条件、现存株数密度、林龄三因子相关的自然稀疏模型,从而可推算出不同立地条件的自然稀疏表,为马尾松人工林密度调控提供科学依据。

目的 在对3.5年生青钱柳种质资源进行评价的基础上，初选适合南京及周边环境相似地区的优良家系及单株，为青钱柳定向培育提供理论依据。 方法 以青钱柳种质资源库31个家系为材料，测定其生长性状和叶总黄酮、总三萜、总多酚含量，分析各性状间的差异，并对青钱柳家系进行聚类分析，同时利用熵权法进行优良家系-单株配合选择。 结果 青钱柳树高、地径等生长性状及叶总黄酮、总三萜、总多酚含量在参试家系间存在显著差异; 聚类分析将31个参试家系聚为4类，第1类推荐为高三萜积累家系，第2类推荐为高多酚积累家系，第3类推荐为高黄酮积累家系，第4类为叶次生代谢物综合含量表现较差家系。根据生长性状和叶主要次生代谢物含量的数据，采用熵权法初选出7个优良家系，分别为GXJZS7#、GZSQ12#、GXLS26#、HNYS2#、AHQLF13#、SCMC31#和GXJZS1#；针对优良家系内单株进一步进行综合评价，筛选出11株优良单株，在叶片总黄酮、总三萜和总多酚含量上综合表现较优。 结论 青钱柳生长和次生代谢物含量在家系间存在显著差异，为青钱柳良种选育提供了极大的空间；基于优良家系-单株配合选择，初步筛选出7个优良家系和11株优良单株可用于进一步试验和应用。