西南喀斯特地区构树苗木生长发育规律

Growth Regularity of Broussonetia papyrifera Seedlings in Southwest Karst Region

以1年生构树苗木为试验材料,对其年生长发育规律进行初步研究。结果表明:苗高、地径、构件生物量的年生长规律符合"S"型生长曲线,表现为"慢—快—慢"的生长规律,可用y=axb生长曲线方程来拟合,得到苗木地径和苗高的生长规律基本相似,但地径生长高峰均比苗高生长高峰推后1个月。根据生长发育规律可将其年生长过程划分为出苗期、生长初期、速生期和苗木硬化期4个时期,根据各阶段苗木的生长特点,提出了育苗关键技术措施,为制定科学合理的育苗技术提供依据。

Growth regularity of one-year-old seedlings of Broussonetia papyrifera were studied. The results showed that the growth regularity of height, diameter and modular biomass were fitted for ＂S＂ curves and represented ＂slow-fast-slow＂ growth regularity, which can be simulated by y = ax^b growth curves equations, the growth rules of diameter was similar with that of height. But the growth peak of diameter was later about a month than that of height. According to yearly growth regularity, the growth process of Broussonetia papyrifera seedlings was divided into four periods： seedlings period, early stage, peak stage and rest stage. According to the seedlings growth characters of various stages,the nursery techniques provided basis for making scientific and reasonable technology of seedlings.