| Choerospondias axillaries is a valuable afforestation pioneer tree species. It has fast growth rate, good textuer, wide usage. Its fruit can use as drug. It has great significance in ecology, ecolomy and social about researching Choerospondias axillaries.By survering in the scene, mersuring the growth index of the tree, such as the height, diamet at breast height and crown width of the Choerospondias axillaries in the research. Specific as follows:The H, DBH and V of Choerospondias axillaries has the trendency of "slow-fast-slow". Their current annual increment reached maximize in10,16and20years; Average increment in13,21and30years. The maturation age of volume is30years old.By weigting the fresh material and measuring the moisture content, calulating the Choerospondias axillaries’s biomass of each part, comparing and analysing the biomass allocation, reched the biomass of each part successively: trunk>root>bark>branch>leaf; average moisture content was50.18%; the R/S value was16.65; indicating the competitive capacity was stronger; the biomass of arborous layer was61.88t/hm2.By collecting and analysing the soil sample, reached sorting of the major element content in this region was N> Ca> Mg> K> P, sorting of the microelement content was Fe>Mn>Zn> Cu. There is significant difference among each spot element content. The relationship analysis of the different nutrient element indicated that there existed a strongly positive correlation in the phosphorus (P) and Mn, copper (Cu) and zinc (Zn), K and Mg, Zn and Mn/P, whereas there was a negative correlation in P and Cu.By measuring the nutrient elements of Choerospondias axillaries in every part, showed:The relationship of element content in every part was Ca>N>Mg>K>P>Fe>Mn>Zn>Cu. The strongest enrichment capacity of major element was P, and the weakest was K. The strongest was Cu and the weakest was Mn in microelement. The accmulate gross of macroelement in arborous layer was1933.07 kg·hm-2, and the gross of microelement was50.734kg·hm-2.By analysing the circulation law of element in forest stand, reached the total nutrient accumulation was1983.80kg·hm-2-a-1, the total nutrient in returm was55.11kg·hm-2·a-1, the average circulation coefficient was0.21, having the longest cycling tume were N and Cu, they had lower plant recovery of nutrient. The highest were Mn and Zn.By the correlation analysis of the nutritive element content between plant and soil, reached:The content of N, Ca and Cu in phytocoenosium respectively and P, Mn; Mg, Ca; P in the soil existed a positive correlation. While the content of Cu in phytocoenosium and the content of Zn in the soil existed a negative correlation. |
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