雨雪冰冻灾害对云和县主要森林群落的影响

Effect of Freezing Rain and Snow Disaster on Main Forest Community in Yunhe County

通过对云和县2008年受雨雪冰冻灾害影响林区的样地调查,研究了不同海拔、坡向、经营措施对主要森林群落受灾率的影响,结果表明,海拔在500 m以下的森林群落受灾率较低,其中针阔混交林和竹林几乎没有受到灾害影响;海拔500 m以上的森林群落受灾率高,其中毛竹林的受灾率最大;不同坡向对森林群落的受灾率影响较为明显,尤其是位于北坡的受灾率最大;不同经营措施中抚育和间伐过的森林群落受灾率低,封山育林的最高。说明在未来云和林区森林保护和经营管理中,海拔500 m以上的毛竹林应特别加强防低温冻害的经营措施,其它森林群落应该以抚育为主,适当的间伐措施为辅,以促进森林群落良好生长,有效抵御和降低雨雪冰冻灾害的影响。

Sample plot survey were made on forest community in Yunhe county, Zhejiang province, where was suffered from low-temperature freezing rain and snow disaster in 2008. The result showed that altitude, slope aspect and management measures of forest community had different influence on damage degree. It had little influence on forest communities below the altitude of 500 meters, especially on mixed forest and bamboo forest, but great influence on that above 500 meters sea level, the worse was in bamboo forest. Slope aspect had evident effect on stricken degree, especially in the northern slope. Forest communities tended and thinned had the lowest disaster degree, while closed forest had highest one. It concluded that tending and thinning could only reduce disaster degree, the major factor is climate.