云南含笑苗期生物量及其相对生长关系的初步研究

本文比较研究了二种不同种源即贵州省威宁县河块乡树舍村和云南省安宁县绿乡官地村的云南含笑苗期的地径、苗高、根系、叶面积等因子生长状况及其生物产量；其次，分析了生物量以及各生长因子间的相互关系：第三．根据实际调查与测定数据拟合了关于生物量与各生长因子以及各器官生物量之间的３４个数学模型。文末拟定了云南含笑一年生苗木分级标准。

A PRELIMINARY STUDY OF BIOMASS AND RELATIONSHIP OF RELATIVE GROWTH OF YEARLING SEEDLINGS OF MICHELIA YUNNANENSIS

This paper deals with the comparative studies of the yearling growth of diameter, height, root, area of leaf and their biomass of seedlings of Michelia yunnanensis. The seed sources are from two counties, i. e. the Weining county of Guizhou province and the Anning county of Yunnan proyince. The author analysed the correlative relationship between the biomass and growth factors of seedlings of M. yunnanensis. According to the data of the practical investigation and measurement, the author set up 34 mathematical mobals between the biomass and growth factors and the biomass of organs of M. yunnanensis seedlings by regressive method. The results showed: 1. The diameter, height, total length of lateral root, area of leaf and total biomass of the yearlings of M. yunnanensis from the Weining county of Guizhou province are better than those from the Anning county of Yunnan province, especially the differences of the diameter, height and area of leaf are very remarkable, i. e. the seed source of M. yunnanensis from the Weining county are better than those from the Anning county. 2. The distribution of total biomass of M. yunnanensis in the organs are: leaf>stem>root (Weining),or leaf>root>stem (Anning), which shows that the base of making up of biomass of M. yunnanensis seedlings are the leaves. 3. The main factor influencing on biomass of M. yunnanensis seedlings are firstly, the area of leaf; secondly, the total length of lateral root, and lastly, the diameter and height. At last, the author suggests the grades of the divisional standard of M. yunnanensis for the yearling seedlings.