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1、丛枝菌根对间作土壤磷的吸收、活化及吸附影响研究3.2.1 分室磷添加与 AMF 接种对玉米、大豆生长的影响 . 223.2.2 分室磷添加与 AMF 接种对玉米、大豆磷吸收的影响 . 263.3 菌根与分室磷添加对间作植株根际土壤磷形态及吸附特性的影响 . 303.3.1 菌根与分室磷添加对间作根际土壤磷形态的影响 . 303.3.2 分室磷添加与 AMF 接种对植株根际土壤磷素吸附特性的影响 . 334 讨论. 374.1 不同根系分隔方式下接种 AMF 对间作作物生长及磷素累积的影响 . 374.2 外源磷与接种 AMF 对间作生长及磷素活化的影响 . 384.3 接种 AMF 与分室磷添
2、加对间作土壤磷素吸附特性的影响 . 394.4 菌根在滇池流域间作体系土壤磷迁移削减中的应用前景 . 405 结论. 416 参考文献. 42致谢. 49丛枝菌根对间作土壤磷的吸收、活化及吸附影响研究摘要在滇池水体富营养化严重的背景下，通过研究丛枝菌根真菌（AMF）和间作模式对滇池流域坡耕地土壤磷素吸收累积、对土壤中内源和外源无机磷和有机磷的活化利用、以及对土壤磷素吸附特性的强化，进一步探讨菌根和间作在滇池流域土壤-植物系统中磷素迁移的协同作用。本研究采用盆栽模拟实验：通过不同玉米/大豆间作方式，对比改变间作作物间根系竞争关系的 3种根系分隔方式（隔塑料布、隔尼龙网和不分隔）和接种不同 AMF
3、对间作体系中植株的生长状况及磷素吸收与累积的影响；三室隔网装置接种不同 AMF (Glomus mosseae(GM)、Glomus etunicatum(GE) 区分根系和菌根对根室和分室土壤内源磷及外源磷无机磷和有机磷的活化，和对土壤磷素吸附特性的影响。结果表明：1、在根系隔塑料布状况下，接种 GM菌能促进玉米、大豆的的生长和根系的侵染；不论接种与否，玉米、大豆根系磷含量及吸收量均以根系隔尼龙网处理时最较高，GE-隔尼龙网组合处理对间作玉米、大豆的生长及磷素累积的促进作用最好。2、菌根接种与分室磷添加处理，红壤上植株磷含量、磷吸收量显著高于紫色土。分室磷添加在根室接种 GM和 GE菌时均不
4、同程度影响了玉米/大豆的生长和磷素的累积，且在 GM-OP50处理时能增加植株磷含量和根系的侵染能力，GE-OP50处理时促进植株的生长和磷吸收。3、无论接种与否，不添加磷处理分室土壤各形态磷含量最低，IOP50和 OP50添加均能增加分室土壤中 7个磷形态的含量；而 GM-OP50和 GE-IOP50处理土壤磷酸酶活性均较高，得出 GM-IOP50组合处理的磷活化利用效果最佳。4、吸附动力学和等温吸附实验结果显示：相同磷浓度条件下，红壤吸附量主要集中在 02 h，紫色土主要集中在 01 h，当吸附振荡至 6 h土壤对磷的解吸吸附基本达到平衡，接种 AMF对土壤磷素吸附的促进作用不显著。GM-
5、P50mg/kg处理土壤对磷素的吸附作用最明显。红壤对磷的等温吸附符合等温吸附方程且与 Langmuir方程拟合好于紫色土。关键字：丛枝菌根；间作；土壤类型；磷；吸收；活化；吸附特性I丛枝菌根对间作土壤磷的吸收、活化及吸附影响研究The Effect of Mycorrhizal on Phosphorus Absorb,Actication and Sorption Characterrisitics in Intercropping SoilGu Linjing(Soil and Water Conservation and Desertification Control)Directed
6、 by Professor Xia YunshengAbstractUnder 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
7、 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
8、 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 in
9、oculation 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
10、 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/soybeanII丛枝菌根对间作土壤磷的吸收、活化及吸附影响研究growth and root colonization. Regardless of
11、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 comp
12、artment, plant Pconcentration and uptake were higher significantly in red soil than the purple partment 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-O
13、P50 could 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 IOP50 and OP50 can improvecompartment P content of seven forms in soil, while under treatment of GM-OP
14、50 andGE-IOP50, P activity was the higher. GM-IOP50 is the best activation usage treatment.4. Adsorption kinetics and adsorption isotherm results showed that in the same condition,P absorption capacity was mainly concentrated in 02 h for red soil and 01 h. forpurple soil when absorption and oscillations to 6 h, P absorption and des
