土壤养分与杉木生长的相关性研究

为了解土壤养分对杉木生长的影响，利用主成分回归的方法，研究福建将乐林场54个样点6种土壤养分与杉木生长的相关性。结果表明，1）土壤养分中，全磷（108.57％）的含量为0.26~8.10 g/kg为强变异性，其他土壤养分、杉木生物量、平均胸径、平均高均为中等变异性。2)土壤养分与杉木各生长指标均存在相关性，甚至有机质、全氮与杉木生物量、平均胸径、平均高均及显著正相关。土壤养分之间，有机质和全氮、全氮与速效钾极显著正相关，有机质与速效磷、速效钾显著正相关，存在明显的增效作用。3)得出土壤养分与杉木生物量、平均胸径、平均高的回归方程，说明有机质、全氮、速效钾、全钾对杉木生长影响较大，且依次递减，有机质影响作用略大于全氮。

Correlation Between Soil Nutrients and the Growth of Chinese Fir

The relationships between soil nutrients and the growth of Chinese fir (Cuninghamia lanceolata) were studied by the principal component regression method. Six nutrients in the soil samples collected from 54 plots representing 6 soil types in Jiangle Forest Farm in Fujian were measured. The results showed that , 1) Among the soil nutrients measrued, the content of total P was 0.26-8.10 g/kg with the highest coefficient of variation, 108.57％, belonging to strong variability. Other soil nutrients, biomass, average D , average H demonstrated medium variability. 2) There existed correlations between soil nutrients and all the growth indices. Significant and positive correlations were found between some soil nutrients (organic matter and total N) and growth indicators (biomass, average D and average H). Among soil nutrients, most significant and positive correlations were observed between organic matter and total N, total N and available K, organic matter and available P, available K were positively correlated, indicating synergism existed between soil nutrients . 3) The regression equation was established between soil nutrient and biomass, average D , average H , which represented that organic matter had the great effect on fir growth, followed by total N, available K, total K.