《陇东黄土高原沟壑区杏树嵌套模式对土壤微生物组成的研究》-毕业论文.docVIP

陇东学院2011届毕业生论文 PAGE PAGE 2 本科毕业生毕业论文 题目：陇东黄土高原沟壑区杏树嵌套模式对 土壤微生物组成的研究 院 系： 生命科学与技术学院 学科专业： 生物科学 指导教师： 教授 作者姓名： 作者学号： 陇东黄土高原沟壑区杏树嵌套模式对土壤微生物组成的研究 （陇东学院 生命科学与技术学院,甘肃庆阳 745000） 摘要：为了认识杏树不同嵌套模式对土壤微生物组成的影响，本研究利用“平板培养法”测定了不同模式下杏树土壤微生物三大类群和主要功能群组成；用“氯仿熏蒸法”测定了土壤微生物生物量碳(MBC)。结果显示：①微生物三大类群区系中：细菌数量占绝对优势，放线菌次之，真菌数量最少；其中以杏树+苜蓿模式的土壤微生物总数明显高于其它模式。②微生物功能群中：杏树+苜蓿模式土壤中固氮菌的数量明显高于其他模式，杏树+黄花菜+苜蓿模式次之，这种数量的变化影响到了土壤C、N转化及杏树嵌套模式的选择。③土壤MBC以杏树+荒地模式最低,杏树+苜蓿模式较CK有明显增加。④由深度趋势看，三大类群、主要功能群及土壤MBC均表现为土壤表层高于其他各层。以上表明，杏树和苜蓿，黄花菜套种可显著增加土壤微生物量。本研究从土壤微生物学角度为黄土高原植被恢复和杏树套种模式的选种提供了借鉴。 关键词：黄土高原；沟壑区；嵌套模式；杏树；土壤微生 Soil microbial composition of Apricot nested model study of Longdong Plateau area Lu Jin-juan Wang Xin (Professor) (College of Life Sciences and Technology, Longdong University,Qingyang 745000,Gansu,China) Abstract: In order to study the influence of the apricot mode on different nest on the soil microbial components，this study using a flat culture method measured the soil microbial three groups and apricot main functional group composed in different modes ;Using chloroform fumigation law measured soil microbial biomass carbon determination (MBC). Results show that: (1)Among three groups microorganisms: bacterial flora amount dominated, actinomycete; secondly and fungi of least Among them with almond + alfalfa mode obviously higher than other soil microbial total pattern. (2) In the microbial functional group: the number of almond + alfalfa mode of Kentucky soil obviously higher than other mode, almond + next day lily + alfalfa mode, this kind of variations in the number of affected soil C、N transformation and almond nested pattern options. (3)The soil MBC with almond wasteland mode lowest, almond + alfalfa mode is CK significantly increased. (4)We can see by deep the trend, the three groups, main functional group and soil MBC, both present surface soil layers than the other. Above all ,