| This study chose the banyan trees as the experimental material identify and analyze the growth of leaves and soil environment in different age banyan content of nutrients, the content of nutrient elements in mastering the nutrition characteristics of tree;Use statistical methods to analyze a variety of nutrition elements content in leaf and soil between the relationship. A self-built ancient appearance health evaluation model combined with grey relation theory, the test banyan health diagnosis, explore the main index with ancient appearance health need the correlation between the main mineral elements;Based on analysis of the nutrition characteristics, breakdowns, the ancient banyan tree for the fertilizer, compared the different fertilization methods on the influence of the ancient banyan tree leaf mineral nutrition levels.The results show that:(1) In different ancient banyan tree leaves, most of the difference of content of nutrient elements are relatively obvious, zinc and boron element content of variation coefficient is the largest,31.84% and 24.19%, respectively, found that the coefficient of variation of trace element content in general higher than that of a large number of elements, content of nutrient elements in leaves is as the degree of aging and less trees, adult banyan tree leaves in the tree and the tree nutrition element content is much higher than the youth.Through to the ancient banyan leaves the nutrition elements of the principal component analysis, the three main components, the cumulative variance contribution rate reached 86.281%, the first principal component by nitrogen, magnesium, boron, zinc, calcium, the second principal component is composed of phosphorus and copper elements, the third principal component is composed of potassium and manganese.(2) A majority of the ancient banyan tree soil nutrient elements of variation coefficient is greater than 10%, the effective boron, copper, exchangeable magnesium effectively the coefficient of variation of more than 50%.Soil at different growth stages, the content of most of the trees in soil nutrients contained less than young trees and mature trees, including effective iron content was significantly different, some elements in adult trees and young trees difference was not significant, the adult establish soil nutrients levels in the whole to be more than in other stages of growth trees.(3) Between the various elements of the ancient banyan tree leaves with different degree of correlation, boron element were very significant positive correlation with zinc,the soil under the tree there are different degrees of correlation between nutrient elements, effective phosphorus were very significant positive correlation with total nitrogen, effective copper and exchangeable magnesium has very significant positive correlation. The analysis found that between the blades and the soil in each corresponding index also found there is a correlation, leaves of boron was significantly positively correlated with soil K. and found that the level of soil organic matter content will have a more prominent effect on the levels of various nutrients in the leaves.(4) Exploring the combination method to determine the health level of the ancient trees appearance evaluation, the ancient banyan health appearance evaluation model is established, based on theory of grey correlation, it showed the ancient banyan health sorts.Were the ancient banyan tree banyan tree and ideal correlation between 0.854 to 0.564 range, combined with the actual observation found that the results of the analysis in conformity with the subjective judgment of tree potential, looks like the good old banyan correlation range between 0.85 to 0.7, correlation is all above 0.68, the ancient banyan tree growth potential recession, correlation between range from 0.6 to 0.6.Each appearance there is different degree of correlation between evaluation index.Through principal component analysis to extract the 3 principal components, and their variance contribution rate of 54.802%, 21.330% and 13.830% respectively, the ancient health appearance evaluation index as the tree canopy leaves, plant diseases and insect pests in the trunk, the root soil environment these three indicators.(5) There is correlation between mineral elements and appearance evaluation index, found that most of the mineral elements and the correlation of tree canopy appearance index is more outstanding, shows the effects of mineral elements on canopy appearance is more obvious.(6) Completed the diagnostic study of ancient banyan nutrition, get nutritional content standards required for the experiment, and provide reference for fertilization experiments. Found weak ancient banyan in nitrogen, phosphorus, potassium, calcium, boron, zinc, manganese content is low, in different stages of the growth of the proportion of three large elements can produce fluctuations, deduce ancient deteriorating health not only because of the lack of nutrition elements content of nutrient elements ratio imbalance is also a can’t ignore one of the important reasons, so the ancient trees fertilization should pay attention to balanced fertilization.(7) Combined with the scientific formula, using both dry and foliar spray of fertilizing can increase the nutritional content of the ancient banyan tree, note applied dry fertilization of longer duration, tree of fertilizer to absorb more smoothly, less affected by the external environment in the process of fertilization, can adjust the speed of the drip, make the absorption of nutrient solution is more sufficient, therefore better note dry fertilizer have an advantage.Leaf fertilizer applied though quick effect, short duration, in practical application, the cycle fertilizing should be scientific and reasonable arrangement, in order to achieve the best effect of rejuvenation. |
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