The Growth And Nutrient Elements Dynamics Of V. Montana Seedlings In Different Disposing Methods

As one of prior utilized plants for biological fuel oil and energy substitute, Vernicia montana is important for forest production. However, some questions about seedlings growth, characteristics of nutrient elements change and best methods for seed disposing are not systematically studied. This paper took seedlings of V. montana as research objects and observed the growth and nutrient elements of V. montana in different disposing methods through field sampling, field experiments and analyses in door. The major results and some new viewpoints were presented as follow:1) In different plant density, the height and basal diameter of seedlings with the density (18 seeds/m2 and 36 seeds/m2) are higher than the density (54 seeds/m2 and 72 seeds/m2). The height of density with 36 seeds/m2 is taller than that with 18 seeds/m2, even so the basal diameter is slightly lower. For avoiding low grade resource utility due to low density, the best plant density for V. montana is 36 seeds/m2. The best plant time is on April 15 with soaking seeds to improve the survivor rate of seedlings.2) Under soaking, some nutrient elements content of modules of V. montana increased, and others decreased. The major nutrient elements such as C, N, P, and K showed wide change range. N and P content decreased first and increased soon afterwards under no soaking and soaking. The rule of K content was different with first-increased and soon afterwards-decreased.3) Different plant density had great effect on the content of V. montana. With season change, the rule of nutrient elements content change fluctuated. C content decreased first and increased soon afterwards. N content of leaves increased first and decreased soon afterwards, as that of stem, direct roots and side roots decreased first and increased soon afterwards. Therefore, P content mainly followed the rule of first-decreased and soon afterwards–increased. Compared to P, K content showed opposite rule.4) In different planting times, the content of nutrient elements variously changed due to multiple effect of planting times, suppress and improvement among nutrient elements and contents in soil. In different modules, the content of nutrient elements variously changed too. Among them, elements content of leaves and side roots mainly followed the rule of first- increased and soon afterwards–decreased. Compared with leaves and side roots, elements content changed complicatedly.5) There were different degrees of correlativity among different nutrient elements in V. montana. N showed positive correlation with P, Ca, Mg, Mn and S, P showed positive correlation with Mg and S, Ca showed negative correlation with Fe and Al, positive correlation with Mn. Therefore, Fe showed positive correlation with Cu, Zn, Al and S, Mn showed positive correlation with S, Cu showed positive correlation with Zn, Al and S, Zn showed positive correlation with Al and S.