| Robinia psezidoacacia, as one of the main afforestion species in North area, has main-sided beneficial results. It is used as the species of timber forest, firewood forest and protection forest. The extremely marked traits of Robinia pseudoacacia are drought-resistant, sand-covered-resistant, powerful root-sprout and heat-resistant .It is perfect species of wind erosion defend and soil-water conservation Which has major significance to bring under control of ecological circumstance. Aimed at the condition that there has not a series of model system which study the growth of Robinia pesudoacacia artificial forest ,this paper probed the growth rule of simple tree in the study plots .In this paper, dominant-height growth model ,mean-diameter growth model , basal area growth model ,and stand volume yield model was set up ,and volume yield table of Robinia psedoacacia stands on Weibei were drew up .These result can be used as a scientific basis in the prediction of manufacture. Sample plot method was taken in order to gain basis data of study and data of analysis was obtained by sieving method of four times standard error; during studying growth rule of Robinia pseudoacacia making analysis of difference precision by means of correlation of pearson; during setting up models, making regression analysis to data by means of nonlinear regression of SPSS 1 0.O;during drawing up stand volume yield table, making up a model dynamic model according to the rule of density effect. In this paper, the growth rule of Robinia pseudoacacia in six major study plots on weibei bess plateau were surveyed and analysed, the results showed as the following: I .The analysis of difference about the growth of Robinia pseudoacacia in six study plots on weibei showed: coefficients about diameter, height volume of Robinia pseudoacacia are bigger than correlation point value 0.798.As a result, the growth of Robinia pseudoacacia in every study plots is similar, there are all not significantly different among them. 2.By analysis of growth rule of Robinia pseudoacacia in the study plots, the conclusion can be made: the growth process of Robinia pseudoacacia conforms to the growth rule of common tree. The rule is the growth of height is stop, the growth of diameter and volume are going on; the growth of diameter and height have stopped, the growth of volume is going on; at the end the growth of volume is stop. The main trend about the growth of diameter and height are all lowing little by little, the growth of volume is all lied in growing stage. 3.By three difference methods about data dealt with, mathematics models for the growth and yield of the Robinia pseudoacacia artificial stand were set up. By means of analysis sample plot data according to nonlinear regression of the statistics soft SPSS 10.0, the conclusion can be drew: The best stand dominant-height growth model is the model (4) in 5.3.1 of this paper ,the precision index: C%Yj 0.143, MSD%1J 1.770; The best stand mean-height growth model is the model (5) in 5.3.2 of this paper ,the precision index: C% 0.045, MSD%Y 1.149; The best stand mean-diameter growth model is the model (1) in the ?5.3.3 of this paper, the precision index: C%Yi 0.162, MSD%j 2.361; The best stand basal area model is the model (4) in ?5.3.4 of this paper ,the precision index: C% ij 0.295, MSD% 2.384; The best stand volume stand yield model is the model (2) in ?5.3.5 of this paper, the precision index: C%) 0.064, MSD% 0.774. The best stand growth and yield models that have been made have higher precision and powerful adaptation in any cases of whol... |
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