Aresearch On Biological Characteristics Of Phyllostachys.vivax Cv. Huanwenzhu And Dynamic Changes Of Soil Nutrient

This paper primarily through the study of the biological characteristics and dynamic changes of soil nutrient of Phyllostachys.vivax cv.huanwenzhu. Discuss the relationship between the bamboo growth and soil nutrient, and then give a comprehensive evaluation of different sample plots and soil nutrient condition. The conclusion as follows:(1) The process of Bamboo shoots out can be divided into three periods:beginning period(from April 24 to May 14), peak period(from May 15 to June 11)and final period(from June 12 to July 25).A large number of shoots back appear in the final period, the number of bamboo shoots back account for 94.38% of the total. The high growth of young bamboo follows three stages:slow-fast-slow. Simulate two growth models of high correlation coefficient: Growth curve model of Logistic:H= 638.600/1+e5.781-0.200t, R2=0.99813; Growth curve model of Doseresp:H=-5.078+645.976/1+102.445-0.085t,R2=0.99799.(2) DBH and relevance of each organ biomass indexes shown with the regression model. The result shows that each model present a significant correlation (Except of under the high branches). Therefore, DBH can be used as an important index of estimation biomass. Through linear regression analysis of rod weight and the biomass indexes, then establish multiple linear regression equation of rod weight (Y) and biomass indexes (DBH X1, Penny X2, leading thread X3, under the high branches X4, sessions X5, leaf weight X6, branch weight X7), and use the stepwise regression analysis, then derive the optimal linear regression model, equation: Y=-289.705+233.163X1+3.403 X4+0.630X7.(3) Dynamic content of bamboo forest soil organic matter and soil total nitrogen are consistent. From May to August, the content of nitrogen declined substantially, and then began to rise after August and reach maximum level in December, all decreased somewhat as compared with those in last December. It shows that the soil total nitrogen is in the state of exhaustion. Soil hydrolysable nitrogen is the nitrogen-supplying capacity of soil indicators. From May to August, the content of hydrolysable nitrogen is lowest, that is the peak period of the use of the nitrogen. The highest content is not in December, but in next March. The changes in available phosphorus are different from organic matter and total nitrogen. From May to October, the phosphorus of soil is in a very low level, it will rise in December and reach the highest value in March. The maximum period of available potassium appears in March. It is consistent with hydrolysis of nitrogen and phosphorus.(4) Through the cluster analysis of sample plots, the twelve pieces of sample plots can be divided into four kinds, The first kind:sample plot ten, sample plot eleven, sample plot nine, sample plot twelve, sample plot four, sample plot seven and sample plot five; the second kind: sample plot eight; the third kind:sample plot one, sample plot two and sample plot three; the fourth kind:sample plot six. It can be drawn from the comprehensive evaluation:no matter in the bamboo growing condition or on the soil nutrient status, sample plot six is optimal.