A QUANTITATIVE STUDY ON THE EFFECTS OF CONTROLLEDBURNING ON THE NUTRIENT LOSS OF THE YOUNG CHINESE FIR PLANTATION
1997, 12 (3):
On the basis of the results of a long term fixed location observation of 5 years, this paper uses the two model parameter t test, the elasticity analysis and the marginal analysis for exploring the effects of the annual time series on the nutrient losses of controlled burning and the the constractive young Chinese fir plantation.The t test shows that the B and A parameters of the loss models of amoniacal nitrogen, nitrous nitrogen, nitrate nitrogen,phosphate, potassium and arganic matter on the annual time series are quite different under different treatments. The elasticity analysis and marginal analysis show that the effects of annual time on the above mentioned nutrients under different treatments are negative. Under the controlled burning conditions, the elasticity coefficients of the above mentioned nutrient losses are-1.215%, -1.214%, -1.215%, -1.215%,-1.214% and-1.214%respectively,and their marginal amounts are-0.394 kg,-0.033 kg-0.365 kg, -0.023kg, -30.010 kg and -59.421 kg respectively. Under the treatments without controlled burning, the elasticity coefficients of the above mentioned nutrient losses are -0.842%,-0.851%, -0.844%, -0.854%, -0.845% and -0.841% respectively, and their marginal amounts are -0.159 kg, -0.010 kg, -0.085 kg, -0.006 kg, -12.024 kg and -17.767 kg respectively.
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