AMF对铅锌矿区农田土壤部分理化性质、玉米生长和镉铅含量的影响

为研究重金属污染胁迫下丛枝菌根真菌（Arbuscular mycorrhizal fungi，AMF）对土壤部分理化性质、玉米生长、光合生理、养分与镉铅含量的影响，以云南会泽、兰坪铅锌矿区周边重金属污染农田土壤为供试土壤，玉米为宿主植物，设置接种和不接种AMF处理，开展室内盆栽试验。结果表明：接种AMF显著增加土壤易提取球囊霉素相关蛋白（EE-GRSP）与总球囊霉素相关蛋白（T-GRSP）的含量；降低土壤有效态镉、铅含量，降幅为34.6%~79.5%；增加土壤中碱解氮和速效磷的含量，增幅为30.9%~206%。接种AMF显著增加玉米植株氮磷养分含量，增幅为17.6%~38.5%；增强叶片光合作用，提高植株生物量；降低植株镉铅含量，降幅达30.0%~68.7%。相关性分析发现，土壤T-GRSP与碱解氮、速效磷含量呈极显著正相关；EE-GRSP、T-GRSP与有效态铅含量呈显著负相关；玉米植株镉、铅含量与土壤有效态镉、铅含量呈显著正相关；玉米根系氮与土壤碱解氮含量、植株磷与土壤速效磷含量呈显著正相关。研究表明，接种AMF增加土壤球囊霉素相关蛋白含量，降低污染土壤镉、铅生物有效性，减少玉米植株镉、铅的含量；增加土壤速效养分含量，改善玉米矿质营养和光合生理，提高玉米植株生物量。

Effects of arbuscular mycorrhizal fungi on soil physical and chemical properties, maize growth, cadmium, and lead content of farmland from a lead-zinc mine area

The present study aimed to investigate effects of arbuscular mycorrhizal fungi (AMF) on soil physical and chemical properties, maize growth, photosynthetic physiology, nutrient content, and cadmium and lead content in maize under heavy metal stress. Heavy metalcontaminated farmland soil was sampled from lead-zinc mining areas in Huize and Lanping Counties, Yunnan Province. A pot experiment was carried out using maize as the host plant with AMF inoculation. Results showed that:Inoculation with AMF significantly increased the content of easily extractive glomalin related soil protein (EE-GRSP) and total glomalin related soil protein (T-GRSP). The available content of Cd and Pb in soil reduced by 34.6%~79.5%, and the content of available nitrogen and phosphorus in soil increased by 30.9%~206%. Under inoculation with AMF, the content of nitrogen and phosphorus in maize increased significantly by 17.6%~38.5%, photosynthesis of leaves and plant biomass were enhanced, and content of Cd and Pb in maize reduced by 30.0%~68.7%. Correlation analysis indicated that there was a very significant positive correlation between the T-GRSP content and the content of available nitrogen and phosphorus. A significant negative correlation between the content of EE-GRSP and T-GRSP and the available Pb content in soil, and a significant positive correlation between the content of Cd and Pb in maize and the available content of Cd and Pb in soil were observed. In addition, there were significant positive correlations between the nitrogen content in maize roots and the available nitrogen content in soil, and between the phosphorus content in maize and the available phosphorus content in soil. Results indicated that AMF inoculation reduced the content of Cd and Pb in maize by decreasing the bioavailability of Cd and Pb with an increase in the GRSP in the polluted soil, and enhanced maize biomass by increasing the available nutrient content in soil and improving the mineral nutrition and photosynthetic physiology of maize.