Abstract:

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.

Key words: Chinese fir, Tending methods, Population structure, Species diversity, Tending cost, Synthetical evaluation