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农田防护林网,如果主木一旦被风摧毁,就会产生风害。林网中主木树冠的排列,要求紧密衔接,才能有效地保护农田。因此主木选择也就成为农田防护林的重要问题之一。斗门县白藤湖围垦区农田防护林网是我省的样板林网。被誉为我省实现农田林网化的先进典型之一。但笔者对该林网主木的选择有不同的看法,这里提出一些粗浅意见,供参考。白藤湖林网的营造始于1979年4月,全部以木麻黄为主木,现林木4年半生,树高9.6～11.5米,1983年9月因受9号强台风的破坏,受害率达35.37％。《广东林业科技通讯》1984年第1期刊登了省农田林网协作组“农田林网抗御台风效果观察”一文,文中述及的林木受害情况可归纳如表1。
Farmland shelterbelts, if the main wood is destroyed by the wind, it will produce wind damage. Lin network arrangement of the main wood canopy, requiring close convergence, in order to effectively protect farmland. Therefore, the main wood selection has become one of the important issues of farmland shelterbelt. Doumen County Bai rattan Lake reclamation farmland shelterbelts network is our province model forest network. Hailed as one of the advanced models of farmland network in our province. However, I have different opinions on the choice of the main wood of the forest network. Some superficial opinions are put forward here for reference. The construction of the Bai Teng Hualin network began in April 1979, and was dominated by the wood of Casuarina. The trees were 4 and a half years old and the height of the trees was 9.6 and 11.5 meters. In September 1983, due to the devastating typhoon No.9, the damage rate reached 35.37%. “Guangdong Forestry Science and Technology Newsletter” 1984 the first issue of the provincial farmland forest network collaboration group “farmland forest net effect of typhoon observation,” a text, the text of the forest damage can be summarized as shown in Table 1.