Abstract:

In this paper,the effects of tending methods on growth and population structure of young Chinese fir plantation have been studied.The results showed that preserving rate and growth of Chinese fir were greatly affected by tending methods.Block tending and overall tending were favourable to elevate survival rate,but non-tending was lowest.Tree height and sprout height basically showed block tending>overall tending>strip tending>chopping tending>non-tending,and this kind of trend became more significant in later period;The basal diameter basically showed overall tending>block tending>strip tending>chopping tending>non-tending.The results of variance analysis showed that the effect of tending on basal diameter was larger than on height.The results of multiple comparison showed that other four tending methods can effectively promote Chinese fir growth except non-tending,and there were no difference among them.The biomass per tree of block tending,overall tending,strip tending and chopping tending was 3.46,3.40,3.15 and 1.11 times as much as that of non-tending,respectively.Ratios of root/stem of block tending,overall tending,strip tending,chopping tending and non-tending was 0.1992,0.1931,0.1673,0.3575 and 0.2680,which be a kind of adaptive phenomenon that Chinese fir competes for underground nutritional space with vegetation under chopping tending and non-tending.The structures of height and basal diameter of Chinese fir population were certainly affected by tending methods,especially basal diameter structure.

Key words: Chinese fir, Vegetation, Tending methods, Biomass, Population structure