印楝1年生苗木生长节律与数量分级标准  

Annual growth dynamics and quantitative grade standard of Azadirachta indica seedling

作　　者：郑益兴[1] 冯永刚 彭兴民[1] 张燕平[1] 

机构地区：[1]中国林业科学研究院资源昆虫研究所,云南昆明650224 [2]云南省元谋县林业局,云南元谋651300

出　　处：《南京林业大学学报（自然科学版）》2008年第3期25-30,共6页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家科技支撑项目(2006BAD18B03);云南省科技计划项目(2005yx20)

摘　　要：通过对1年生印楝实生苗木群体的动态研究,建立了苗木的年生长模型、连日生长量模型和日平均生长量模型,并据此模型将印楝苗木生长节律划分为4个阶段:出苗期(10月中旬至下旬)、生长初期(11月上旬至翌年4月中旬)、速生期(4月下旬至9月下旬)和生长后期(10月上旬至下旬);苗木生物量积累与苗高、地径的函数模型关系表明,苗木生物量(包括地上部分、地下部分和全株干重)与苗高、地径的相关性极为密切,其中全株干重占全株鲜重的38.8%,地上部分干重占全株鲜重的26.8%,占全株干重的69.1%;同时,以苗高、地径为参考指标,对9个月生的印楝造林苗木进行了数量分级标准划分,并运用该分级标准进行造林试验,结果表明将印楝造林苗木从数量指标上划分为Ⅰ级、Ⅱ级和Ⅲ级是科学合理并切实可行的,其中仅Ⅰ级与Ⅱ级可以用作造林合格苗木。Through a dynamic study on one-year seedlings from seeds of Azadirachta indica, the annual growth model, continuous day growth model and daily average growth model were created. According to these fitted models, the growing dynamics of seedlings could be divided into 4 stages, i.e. emergence phase（from the middle ten-day to the last ten-day of October） , initiation phase（from the first ten-day of November to the middle ten-day of April next year） , prosperous phase（from the last ten-day of April to the last ten-day of September） , later phase of seedling（from the first ten-day to the last ten-day of October）. The functional model about height and ground diameter with the biomass of seedling indicated that the biomass of seedling（ including aboveground biomass, underground biomass and the total biomass） was closely related to the growth of height and ground diameter of seeding. The total dry weight was 38.8% of the total green weight, and the aboveground dry weight was 26.8% of the total green weight and 69. 1% of the total dry weight. Meantime, according to convention, and the reference index of height and caliper, the quantitative grade standard of nine-month seedlings of A. indica was divided. The experiment of forestation was carried out according to the seedling＇ s quantitative grade standard. The results showed that the quantitative grade standard of A. indica seedlings in 3 grades was reasonable and feasible. But only Grade Ⅰ and Grade Ⅱ seedlings could be used to afforest.

关 键 词：印楝 生长模型 实生苗木 数量分级 

分 类 号：S722[农业科学—林木遗传育种]