论文部分内容阅读
本文对我局所辖管的10个林场其中的6个林场,所在廉江、遂溪、海康三个县境的分别由砂页岩发育而成的砖红壤、浅海沉积物发育而成的砖红壤、玄武岩发育而成的砖红壤三个主要土壤类型的主要物理性质的坚实度、通气性、自然含水量、容重互相关系及对柠檬桉人工林(实生)林分的平均胸径生长的影响作了研究探讨。分析表明:土壤的自然含水量是影响柠檬桉林分胸径生长的主要因素,其次是土壤的容重、通气性、坚实度,且各因子是相互作用、相互制约和相互影响。土壤通气性在15～25%,林木生长良好,10～15%适宜,10%以下生长不良。容重在0.9～1.1林木生长良好,1.1～1.25适宜,1.25以上生长不良。可见,要使柠檬桉林木生长良好;必须使土壤保持疏松、湿润。
In this paper, 6 forest farms in 10 forest farms under the jurisdiction of our bureau are developed from brick red soil and shallow sea sediments developed from sand shale in Lianjiang, Suixi and Haikang counties The influence of the solidity, aeration, natural water content, bulk density and interdependence of the main physical properties of the main physical properties of the three major soil types on the brown earth made of brick red soil and basalt, and their influence on the average DBH growth of the eucalyptus citri artificially (stand) Made a research discussion. The analysis shows that the natural water content of soil is the main factor influencing DBH growth of eucalyptus citri. The second is the soil bulk density, aeration and solidity, and the factors are interaction, mutual restriction and mutual influence. Soil aeration at 15 ~ 25%, trees grow well, 10 ~ 15% suitable, less than 10% poor growth. Bulk density of 0.9 ~ 1.1 trees grow well, 1.1 ~ 1.25 appropriate, more than 1.25 poor growth. Visible, to make lemon eucalyptus trees grow well; must keep the soil loose, moist.