青海燕麦根区AM真菌的空间分布研究

对青海省民和、大通、湟中、海北4样地燕麦根际AM真菌空间分布和土壤成分测定分析表明,燕麦可与AM真菌形成共生关系,AM真菌不同指标和孢子密度与样地生态条件密切相关。侵染强度最高在民和,丛枝丰度、泡囊丰度和菌丝丰度在海北最高,地孢子密度最大值在湟中,且最大值均发生在0~10 cm土层,0~30 cm土层随土壤深度增加呈下降趋势。孢子密度与AM真菌各项指标均呈极显著正相关;侵染强度与有机质和速效磷呈极显著正相关;丛枝丰度与速效磷呈极显著正相关;泡囊丰度与有机质呈极显著正相关,与速效磷呈显著正相关;孢子密度与速效磷呈显著正相关。

Studies on Spatial Distribution of Arbuscular Mycorrhizal Fungi from the Rhizosphere of Avena sativa in Qinghai Province

Spatial distribution of arbuscular mycorrhizal fungi jn the rhizoposphere of Avena sativa and its relativity to soil fators were investigated in four sites of Minhe, Datong, Huangzhong and Haibei in Qinghai province.The result indicated that good symbiosis was formed between AM fungi and Avena sativa, and different sample sites significantly affected the colonization of different structure and spore density of AM fungi. The highest value of colonization intensity is in Minhe, the highest arbuscule abundance,vesicular abundance and Hypha abundance is Haibei, the highest spore density is in Huangzhong, and the maximum value of spore density existed in the depth of 0~10 cm of soil, and the value decreased gradually along with the increasing of soil depth in 0~30 cm echons.Spore density had a significant positive correlation on the colonization of deferent structure,colonization intensity was very significantly correlated with soil organic matter and soil available P, arbuscule abundance hacf a significant negative correlation with soil available P, spore density hacf a positive correlation on soil available P.