The Research On The Bioavailability Of Soil Phosphorus Of Camellia Oleifera Forest

Camellia oleifera is one of the focus on development of woody edible oil tree, mainly distributed in the acid red soil in south China, while the lack of phosphorus(P) severely restricts the development of Camellia oleifera industry. The Camellia oleifera forest stands in Hunan Province as the research object. Analysis the content and distribution of different phosphorus element in the soil, the relationship between the elements of different forms of phosphorus. Explore different phosphorus source processing of Camellia oleifera root morphology and soil phosphorous fractioning effect, and different planting mode of Camellia oleifera forest soil phosphorus element phosphorus forms and hormone effectively to the impact, in order to elucidate the phosphorus utilization of Camellia oleifera, explore the tea of phosphorus, using capacity and promote the Camellia oleifera high-yield cultivation and provide a theoretical basis. The main results are as follows:l.The distribution and correlation of different phosphorus in Hunan Camellia oleifera forest. The content of soil available phosphorus in 0-20cm and 20-40cm soil layer varied respectively 0.508-2.622mg/kg 0.422-2.318mg/kg, the content of available phosphorus in 0-20cm soil layer was significantly higher than that of 20-40cm soil, the content of effective phosphorus in the rhizosphere soil than in rhizosphere increased by 4.50% to 4.50%, up to 2.932 mg/kg, an average of 1.893mg/kg. The content of soil total phosphorus 0-20cm and 20-40cm soil ranges were 0.175-0.465g/kg,0.140-0.421g/kg,0-20cm soil total phosphorus content higher than 20-40cm soil, but the difference was not significant, soil total phosphorus content of up to 0.848g/kg, averaged 0.32g/kg. Al-P, Fe-P, O-P, Ca-P four kinds of inorganic phosphorus in 0-20 cm soil layer in the average content was higher than that in the 20-40cm soil layer, the maximum contents of Al-P and Fe-P were 0.14g/kg,0.17g/kg and O-P and Ca-P contents only 9.31mg/kg,17.58mg/kg, four soil inorganic phosphorus content in order of size for Fe-P> Al-P> Ca-P>O-P. Effective phosphorus in rhizosphere soil, oxygen phosphorus and calcium phosphorus were significantly negative correlation, and aluminum phosphorus, iron phosphorus showed a significant positive correlation, the correlation between total phosphorus in root and leaf is low, soil available phosphorus and total phosphorus of the roots and leaf phosphorus was positively correlated, indicating that aluminum phosphorus and iron phosphorus may be the main source of available phosphorus in rhizosphere soil.2. Effects of different phosphorus sources on root morphology and phosphorus element classification of Camellia oleifera. Camellia oleifera ’Xianglin 210’ as test material, so as not to impose exogenous phosphorus as a control. The pot experiment explores that the impact of insoluble inorganic phosphate (Fe-P, Al-P and Ca-P) for Camellia oleifera root morphology and tree nutrition levels. The results showed that different phosphorus source treatment significantly increased the dry weight of root. Al-P and Ca-P significantly improve the aboveground dry weight, and Fe-P is not obvious. Three different sources of phosphorus treatments on root average diameter promoting mutual not significant were superior to that of control; it was significantly different from the controls, which Ca-P significantly increased the root length, the total surface area and the total volume of the Camellia oleifera. Al-P treatment dramatically increased the content of the aluminum of leaves and roots, Ca-P treatment significantly enhances the content of calcium in soil and leaves.3. Analysis of soil phosphorus fractions of Camellia oleifera forest under different cultivation measures and effectiveness. To not plant any crops Camellia forest soil as a control (CK), exploring the effect of four understory planting pattern with feeding chicken under the forest, sod culture, intercopping peanut and intercopping soybean on soil phosphorus content in the form of Camellia oleifera forest soil and effectiveness. Under different cultivation measures the content of available P in the rhizosphere soil of Camellia oleifera forest was significantly higher than that of non rhizosphere soil, and it can significantly increase the content of available phosphorus in the 0-20cm soil layer, the most significant of the effect of intercropping soybean; feeding chicken under the forest and sod culture significantly increased the content of total phosphorus in Camellia oleifera forest rhizosphere soil and non root rhizosphere soil, interplanting peanut and soybean on the effect was not significant; different cultivation measure contents of Al-P and Fe-P were significantly higher than those of O-P and Ca-P, which sod culture significantly improve the content of Ca-P in rhizosphere soil.