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OALib Journal期刊
ISSN: 2333-9721
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沙田柚根围am真菌的生境适宜性和季节变化性
DOI: 10.3724/SP.J.1145.2011.00684, PP. 684-687
Keywords: am真菌,沙田柚,生境,季节变化,侵染率,孢子密度
Abstract:
以山地长寿沙田柚成年果树为对象，研究不同生境和季节对丛枝菌根（arbuscularmycorrhiza，am）真菌侵染以及根围土壤中am真菌孢子密度的影响.试验结果表明，不同生境下，菌根侵染率和am真菌孢子密度都是以梯田最高，坡地次之，洼地最低；在坡地和洼地生境下，生草区均高于清耕区.两块试验地am真菌的菌丝侵染率均为夏季最高（16.8%±1.9%和16.0%±1.8%），秋季次之，冬季最低；丛枝和泡囊的形成也是夏/秋季较高，春/冬季较低；而根围土壤中am真菌孢子密度则是秋季最高[(159±19)个/100g和(167±17)个/100g]，夏季次之，冬季最低.总之，对于长寿沙田柚成年果树，am真菌的菌根侵染率在夏季梯田最高，根围土壤中的am真菌孢子密度在秋季梯田最高；在坡地和洼地生境中，生草处理均可显著提高菌根侵染率和am真菌孢子密度.图4参27
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