杉木幼林抚育技术的综合评价和决策

SYNTHETICAL EVALUATION AND STRATEGY OF TENDING TECHNIQUES IN YOUNG CHINESE FIR PLANTATION

本文在全面分析不同抚育技术对杉木生长、群体结构、林地植被物种多样性、生物量、水土流失和抚育成本的影响基础上 ,运用灰色局势决策理论对不同抚育技术进行多目标决策 ,结果表明 :块状抚育和全垦抚育可提高杉木的保存率 ,并促进杉木幼林的生长 ;抚育技术对杉木群体树高和地径结构有一定的影响 ,尤其是对地径结构 ;全垦抚育的成本最大 ,不抚育最小 ,块状抚育居中 ;块状抚育有利于形成多层次的林分结构和林地植被物种多样性的提高。综合评价结果表明块状抚育是南方林区较好的杉木幼林抚育方式 ,它既能有效地减少林地植被对杉木的竞争 ,保持杉木的正常生长 ,又能降低抚育成本和保持地力及物种多样性。

In this paper,based on overall analyses of effects of tending techniques on growth,population structure,species diversity of vegetation,biomass soil erosion and tending cost in young Chinese fir plantation,Multi\|target decision of different tending techniques by means of grey situation decision theory was carried out.The results showed that block tending and overall tending were favourable to elevate survival rate and promote growth of young Chinese fir plantation.The structures of hiehgt and basal diameter of Chinese fir populations were certainly affected by tending techniques,especially basal diameter structure.The cost of overall tending was greatest,non\|tending smallest,block tending medium.Block tending was favourable to form multi\|layer stand structure and elevate species diversity of vegetation. The synthetical evaluation results showed that block tending was a better tending way for young Chinese fir plantation in southern forest region,it could not only decease competition between Chinese fir and vegetation,and keep up normal growth of Chinese fir,but decrease tending cost,and conserve soil fertility and species diversity as well.These have important practical significance for guiding tending of young Chinese fir plantation.