黄河下游高产桑园的群体结构研究  

STUDY ON THE POPULATION STRUCTURE OF THE HIGH PRODUCTIVE MULBERRY FIELD IN THE LOWER REACHES OF THE YELLOW RIVER

作　　者：李茂贞[1] 许乐春[1] 樊孔彰[1] 石瑞常[1] 江嘉霖 

机构地区：[1]山东农业大学林学院,山东省蚕业研究所

出　　处：《山东农业大学学报（自然科学版）》1994年第3期335-340,共6页Journal of Shandong Agricultural University：Natural Science Edition

摘　　要：在桑树品种与栽植密度相同的条件下，选择高产、丰产、中产的３种不同类型桑园，进行群体结构研究，较系统地调查了有效条、平均单叶叶面积及单叶重，叶面积指数和叶面积持续期的变化规律。重点讨论了每公顷产桑叶４５０００ｋｇ桑园的群体结构特点，提出了高产桑园群体结构的主要指标。On the bases of the same variety and planting density, the population structure of thethree-type mulberry fields-high yield, bumper yield and middle yield were investigated.The changes of the available branches, the area and weight of single leaf on an average,leafarea index and leaf area sustaining period were investigated systematicly. The characteristics of the population structure of the mulberry field that gave 45000 kg leaves per hm2,were analysed in detail. The main indices of the population structure of the high yield mulberry field were suggested.

关 键 词：桑树 桑园 高产 群体结构 

分 类 号：S888.2[农业科学—特种经济动物饲养]