Effec Of Cultivation Measures On Wood Chemical Components Of Eucalyptus Grandis Pulpwood

Using the design of quadratic common rotation including four factors, five levels, the basic models of efficiency were established between density, N, P, K and synthetic value of Wood Chemical Components of Eucalyptus grandis Pulpwood, and the quadratic regression models were simulated closely with reality bytesting. The results of principal-efficiency analysis, mutual-efficiency analysis and frequency analysis indicated:1) Impacting synthetic value of Wood Chemical Components of Eucalyptus grandis pulpwood timber,the order of the four factors was as follows from the high to the low: density > P > K > N. when the rest factors were fixed to -2, -1, 0, 1,2 level, the application of nitrogenous fertilizer individually hadn't better be over 82.5g/N , 65g/N,50 g/N,32.5g/N,15g/N; the application of Phosphate fertilizer individually hadn't better be over 62.5g/N, 52.5g/N,37.5g/N,30g/N,20 g/N; the application of potash fertilizer individually hadn't better be over 95g/N, 72.5g/N,50g/N,27.5g/N,12.5 g/N.2) The effect of density on synthetic value of Wood Chemical Components was positive at any level of N or K, moreover the effect of N or K firstly rise then dropped at any level of density. The effect of density on synthetic value was not significant applying no phosphate fertilizer, but applying phosphate fertilizer helped raise the effect of density. In total, the effect of high density and high P was fairly good, but that of high density and low P or high P and low density was inferior. The effect between P and K was similar to that between N and P. The effect of high P and low K similar to that of high K and low P was fairly good. The effect of high P and high Knot as good as that of low P and low K was inferior. Samely, the effect of high N and low P similar to that of high P and low N was fairly good. The effect of high N and high P not as good as that of low N and low P was inferior. The effect of N similar to that of K firstly rise then dropped, when N and K interacting.3) The high quality cultivated pattern When the four factors of density, N, P, K are inthe confidence limit of 95% was the following: plantation density is 152-156 N/667m2; N is50-58 N/667m2; P is 43-52 N/667m2; K is 50-59 N/667m2.On basis of the combination, synthetic value of Wood Chemical Components may be in excess of 88.13,the average value of stand. Combined with early stage result, the excellent cultivated pattern for high yield as well as high quality was the following: plantation density is 152-155 N/667m2; N is 54-58 N/667m2; P is 49-52 N/667m2; K is 50-52N/667m2.