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混交林比纯林优越,这方面已愈来愈多为人们注目。我们曾对一块湿地松、大叶相思异龄混交林和湿地松纯林持续三年进行了生态效应的观测和一些生理指标的测定。本文将观测结果作初步的分析。一、林地概况湿地松、大叶相思异龄针阔叶树混交林试验地在所内东北面的银屏岭,海拔40—60m,年平均温度22℃,年降水量1,638mm。土壤为花岗岩薄腐殖质厚土层山地赤红壤,植被主要为芒箕、桃金娘、鹧鸪草等。湿地松是1971年造林的,株行距3×3m。1979年以后,每亩留下34—46株,林内光照4,000—6,000勒克斯。1982年7月,在湿地松林内按1.5×1.5m 的株行距种上大叶相思。每亩200—220株。混交林的面积每区为2.5亩,设纯林对照,重复二次。二、观察内容和方法
The mixed forest is superior to the pure forest, which has attracted more and more attention in this area. We have conducted an ecological effect observation and some physiological indicators on a wetland Pinus elliottii mixed forest and Slash pine pure forest for three years. In this paper, the results of the initial analysis. First, the overview of woodland Pinus elliottii, Larix Achyranthes sinensis mixed forest test site in the northeast of Yinping Ridge, 40-60m above sea level, the average annual temperature of 22 ℃, the annual rainfall of 1,638mm. Soil is thin granitic humus thick layer of soil red soil, vegetation mainly Mangui, myrtle, partridge grass and so on. Slash pine is afforestation in 1971, spacing of 3 × 3m. After 1979, 34-46 plants per mu were left behind, and the forest light was 4,000-6,000 lux. July 1982, in the wetland pine forest by 1.5 × 1.5m spacing spacing Acacia planted. 200-220 plants per acre. Mixed forest area of 2.5 acres for each area, set pure forest control, repeated twice. Second, observe the content and methods