苏北泥质海岸主要防护林树种生长特性

以苏北泥质海岸主要造林树种杨树（72杨）、水杉和银杏为研究对象,在标准地调查的基础上,伐倒17株标准木,称其各器官的生物量,并根据树干解析法对其生长特性进行研究。结果表明：杨树生长速生期为6-11 a,早于水杉的16-21a,银杏在0-10 a内生长缓慢。宽冠型树种树冠在成熟龄后,仍有缓慢生长,而窄冠型树种则保持稳定。株行距越近于正方形越有利于宽冠型树种的生长,在胸径、生物量生长速度方面,林农复合明显快于片林。

Growth characteristics of the main shelterbelt species on the muddy sea-coast in northern Jiangsu Province

This paper was taking the Populus tomentosa, Metasequoia glyptostroboides and Ginkgo biloba as the research objects, which were the main afforestation tree species on the muddy sea-coast in Jiangsu Province. According to the investigation of the sample plot, we cut down 17 standard trees and weighed each organ biomass. Growth characteristics were studied by means of stem analysis. The paper gives out some research results as follows. The fast growing pcriod of P. tomentosa is during 6 to 11 years, earlier than M. glyptostroboides which is during 16 to 21 years, and G. biloba grows slowly during 0 to 10 years. Crown width would keep slowly growth for the wide-crown species and the narrow-crown species would keep stable growth after mature age. The planting space was more closely to square, the better grew the wide-crown species, agroforestry model is growing faster than patch forest in DBH and biomass.