摘要
为评价和管理荒漠植物生长,于2015年7月在内蒙古乌海、磴口和阿拉善3样地,按0~10、11~20、21~30、31~40、41~50cm共5个土层采集蒙古沙冬青(Ammopiptanthus mongolicus)根围土样和根样,研究了蒙古沙冬青与AM真菌共生结构,以及球囊霉素与土壤因子的相关性。结果表明,蒙古沙冬青根系能被AM真菌高度侵染形成I-型丛枝菌根,AM真菌定殖率具有明显的空间异质性。PCA分析表明,土壤pH、氨N、有效P、有机C,速效K是3样地的主要影响因子,能综合反映内蒙古荒漠土壤肥力状况;易提取球囊霉素(EEG)和总球囊霉素(TG)占土壤有机C的平均百分比分别为36.8%和24.1%,说明蒙古沙冬青能与AM真菌形成良好的共生关系,在极端荒漠环境中球囊霉素是土壤有机碳库的重要来源和组成部分。
To evaluate and manage the growth of desert plants,the root and soil samples from five depths 0-10,10-20,20-30,30-40,and 40-50 cm under A.mongolicus were collected from three different sites including Wuhai,Dengkou and Alxa in July 2015,in Inner Mongolia to investigate the correlation between colonization of arbuscular mycorrhiza fungi and glomalin and soil factors.The results show that the roots of A.mongolicus cab be highly infected by the AM fungi and form intermediate type arbuscular mycorrhiza,and the colonization regular of AM fungi exists obvious spatial heterogeneity.Principal component analysis shows that pH,available P,ammonia nitrogen,organic C and available K are the main influence factors,and can be used to reflect the nutritional status of desert soil in desert zones.Easily extractable glomalin and total glomalin account for 36.8% and 24.1% of soil organic C,respectively,which suggests that glomalin is the important sources and components of soil organic carbon in the desert zones.The results show that A.mongolicus can establish well symbiosis with AM fungi,and structure of AM fungal colonization and glomalin can be used as effective index which evaluate desert soil quality.
出处
《中国科技论文》
北大核心
2017年第9期1030-1037,共8页
China Sciencepaper
基金
国家自然科学基金资助项目(31170488)
河北大学研究生创新资助项目(X201722)
关键词
AM真菌
球囊霉素
土壤因子
蒙古沙冬青
内蒙古荒漠带
AM fungi
glomalin
soil factors
Ammopiptanthus mongolicus
Inner Mongolia desert zones
