地形与橡胶园风害的关系——1409号超强台风“威马逊”对海南橡胶园风害的调查

对1409号"威马逊"台风造成的海南橡胶园(简称胶园)的损害展开调查,分析了不同地形因子与胶园风害的关系。结果表明:胶园风害不仅与风力有关,而且还与胶园的立地环境有关,胶园风害率由重至轻依次为:坡顶﹥坡底﹥坡中,迎风坡﹥侧风坡﹥背风坡,但若存在其他地形因素影响,坡位与坡向之间的风害率差异不明显。坡度越大风害越重,周边环境有遮挡物的胶园风害明显小于处在空旷区的胶园,特殊地形的胶园风害与其所处位置有关。

海南岛橡胶树风害坡度的影响特征

以不同坡度产生橡胶树的风害差异为目的,通过对橡胶树〉4级风残树的累积风害数据统计,对海南岛橡胶树胶林样地进行系统的风害分析。调查结果,在轻风害、中风害类型区,85%的坡体不同坡度受风害程度为：〉25°的坡体风害最严重,其次为15°~25°,〈15°风害程度最小。在重风害类型区,90%的坡体〉25°的坡体风害最严重,其次为〈15°的坡体,15°~25°风害程度最小。结果显示,轻风害区坡度之间差异不显著,中风害区只有〉25°坡体与15°~25°差异显著,重风害区各坡度级别差异极显著。坡面之间的差异以〉25°坡体最严重。海拔于100~200 m地区,大部分坡体的坡度之间差异不显著,随着海拔抬升,坡度之间差异逐渐显著。

雷州半岛桉树无性系抗风性的研究

On July 23rd2003,Leizhou Peninsula was attacked by typhoon "IMBUDO",when the author investigated the capacity of wind ressitance of 27 Eucalyptus clones and different aged stands of E.urophylla U6,and E.ABL 12 W5 clones.Several methods including comparison,variance analysis,and regression analysis,were used to analyze the relationship between growth period,stand densitiy,direction,and the characteristics of Eucalyptus clones and wind-resistance.The results showed that the wind-resistance of Eucalyptus clones was closely correlated with the age,density,and direction of the stand.The difference of clones in tree height,DBH increment and timber density led to the significantly difference in wind-resistance.The following Ecualytpus clones with strong wind-resistance were selected:MJ41,MJ53,MJ57,MJ43,MJ45,W5,EC1,W6,W2,and ZU6.

闽南丘陵山地桉树不同无性系栽培试验研究

桉树是闽南丘陵山地主要造林树种之一,近几年来营造的桉树无性系以巨尾桉和尾巨桉为主,桉树品种较为单一,对桉树可持续经营不利。为此,在云霄县开展了桉树不同无性系的栽培选择试验。研究表明,参试的10个桉树无性系中,广3、M1、T5、ZL11、T4和ZL9等6个无性系造林保存率高,达80%以上,而受风害比较轻微;这6个无性系生长较快,年高生长量4m,年胸径生长量4 cm。初步认为这6个无性系为闽南山地优良的桉树品种。