灰叶荆群落生长和更新能力的研究

本文对厦门地区灰叶荆群落的生长和更新能力进行了研究。该植物3、4年生群落植株基径年增量为0.71～0.91cm;当年播种植株高和基径年增量分别为299.4和3.38cm;4、5年生群落母桩萌条的高和基径年增量分别为304.4～264.0cm和2.25～1.55cm。光照,温度和雨量是影响该植物生长和萌更的主要生态因子。光照的差异使群落内个体分化为被压木和优势木两类。该植物自然更新能力差,但其种子发芽力强,耐贮;影响种子发芽的主要因素是气温和采种期。

Studies on Growing and Regenerative Capacity of Acacia glauca comm.

This is a report on the growing and regenerative capacity of Acacia glauca comm. in the artificial stand in Xiamen. The annual average increments of the basal diameter of 3-and4-year-oldA. giauca comm. are 0.71 and 0.91cm respectively. The faster its increase is, the larger its basal diameter is. The differetiation among the individuals in comm. become apparent by the differences of light intensity, Some become dominant and others, is depressed. The average increments of the basal diameter of its sown individuals is 3.38cm the same year, and of the height, is 299.4cm. The avreage increments of the BD. of coppice individuals 4-and5-year-old A. glauca comm. are 1.55 and 2.25cm respectively the same year, and of the height, are 264.0 and 304.4cm respectively. The light indensity , air Temp . and rainfall are the major factors affecting their growing rate.It can be regarded as a new potential biological resource for firewood and water-soil conservation in the southeast coastal regions of China because its growing rate is fast and regenerative capacity is strong.