The Effect Of Mycorrhizal On Phosphorus Absorb, Actication And Sorption Characterrisitics In Intercropping Soil

Under the background of severe eutrophication for Dianchi lake, the influences hadbeen studied for arbuscular mycorrhizal fungi (AMF) and intercropping models on plantphosphorus (P) uptake and accumulation, on the activation and using of endogenous andexogenous P in slope farmland soil of Dianchi Lake Basin, and on the strengthening effectof soil phosphorus adsorption characteristics. Furthermore, the combined effects of AMFand intercropping on P migration in soil-plant system also had been explored, whichcould be provide a theoretical basis for the prevention and control of water pollution inDianchi Lake. In this research, growth and P accumulation of maize (Zea mays L.)intercropped with soybean was studied through a pot cultural experiment under differentroot separation ways (no separation, nylon net separation, plastic film separation) and threeAMF inoculation treatments. In addition, the intercropping maize/soybean plants wereinoculated with different AMF (none mycorrhizal (NM), Glomus mosseae inoculation(GM), Glomus etunicatum (GE)) through three rooms across network devices todistinguish between roots and mycorrhizal root, and the soil P forms change and absorptioncharacteristics in root chamber and soil chamber were also studied through adding P to soilcompartment. Results shown as follow:1. The treatment of inoculating GM under plastic barrier can promote corn/soybean growth and root colonization. Regardless of inoculation or not, P concent and uptakeby corn/soybean roots were the highest under the plastic barrier treatment. treatmentof GE with plastic-film had the best promotion effect to intercropping cron/soybeangrowth and P accumulation.2. For treatment of mycorrhizal inoculating and P adding to compartment, plant Pconcentration and uptake were higher significantly in red soil than the purple soil.compartment added P with GM and GE can affect corn/soybean growth and Paccumulation in different degree. In the treatment of GM-OP50, plant P content androot colonization rate were improved. Treatment of GE-OP50could promote plantgrowth and P activation absorbing content.3. Whether inoculating or not, minimum compartment P content.in different formsappeared under the treatment of none P adding. Adding IOP50and OP50can improvecompartment P content of seven forms in soil, while under treatment of GM-OP50andGE-IOP50, P activity was the higher. GM-IOP50is the best activation usage treatment.4. Adsorption kinetics and adsorption isotherm results showed that in the same condition,P absorption capacity was mainly concentrated in0~2h for red soil and0~1h. forpurple soil when absorption and oscillations to6h, P absorption and desorptionequilibrium was achieved, and AMF inoculation promoting soil P absorption was notsignificant, however under treatment GM-P50mg/kg, soil had the most obviousabsorption to P. P adsorption isotherm of red soil not only accord adsorption isothermequation also fitting Langmuir equation and better than purple soil.