库布齐沙漠不同人工固沙灌木林土壤微生物量与土壤养分特征

发布时间：2018-03-17 20:09

  本文选题：人工固沙灌木林　切入点：土壤微生物　出处：《应用生态学报》2017年12期 　论文类型：期刊论文

【摘要】：在库布齐沙漠东段选取人工油蒿+杨柴半灌木混交林、人工柠条锦鸡儿灌木林和人工沙柳灌木林3种人工固沙灌木林为对象,以流动沙地为对照,研究了不同人工固沙灌木林土壤微生物生物量碳和氮、土壤微生物数量、土壤养分变化特征及其相互间的关系,并运用综合指数法对不同人工固沙灌木林的土壤恢复效果进行评价.结果表明:与流动沙地相比,3种人工固沙灌木林土壤有机质、全氮、全磷、速效氮、速效磷含量均有不同程度的提高,表现为油蒿+杨柴林地柠条锦鸡儿林地沙柳林地,且均随土层加深而依次降低;3种人工固沙灌木林土壤微生物数量、微生物生物量碳和氮均较流动沙地有不同程度的提高,油蒿+杨柴林地土壤微生物生物量碳氮和细菌相对数量高于柠条锦鸡儿林地和沙柳林地,而真菌与放线菌相对数量则表现为柠条锦鸡儿林地沙柳林地油蒿+杨柴林地;影响3种人工固沙灌木林土壤细菌相对数量、微生物生物量碳和氮的因素是土壤有机质、全氮、全磷、速效氮、速效磷含量及C/N,而放线菌、真菌相对数量主要受土壤全磷、速效氮和速效磷含量的影响;不同人工固沙灌木林土壤质量排序为:油蒿+杨柴林地柠条锦鸡儿林地沙柳林地流动沙地,表明不同人工固沙灌木林的建植均能提高沙漠土壤质量,其中营造油蒿+杨柴半灌木混交林对提高土壤综合质量效果最好.
[Abstract]:In the eastern section of Kubuqi Desert, three kinds of artificial sand fixation shrub forest, artificial Caragana Caragana shrub and artificial Salix shrub, were selected, and the flow sandy land was used as control. The soil microbial biomass, carbon and nitrogen, the number of soil microorganisms, the variation characteristics of soil nutrients and their relationships in different artificial sand fixation shrubs were studied. The effect of soil restoration in different artificial sand fixation shrub forest was evaluated by comprehensive index method. The results showed that the soil organic matter, total nitrogen, total phosphorus and available nitrogen of three kinds of artificial sand fixation shrub forest were compared with the moving sandy land. The content of available phosphorus was increased in different degree, which showed that the soil microbial quantity of three kinds of artificial sand fixation shrub was decreased with the deepening of soil layer, which was shown in the forest land of Caragana korshinskii, Artemisia artemisia, and Caragana korshinskii. Microbial biomass carbon and nitrogen were increased in different degree than those in flowing sandy land. Soil microbial biomass, carbon, nitrogen and relative number of bacteria in Artemisia annua forest were higher than those in Caragana korshinskii and Salix korshinskii forest. The relative number of fungi and actinomycetes was shown as Artemisia artemisia forest in Caragana korshinskii forest, the relative number of bacteria in soil of three artificial sand fixation shrub forest was affected, the factors of microbial biomass carbon and nitrogen were soil organic matter and total nitrogen. The contents of total phosphorus, available nitrogen, available phosphorus and C / N, and the relative quantity of actinomycetes and fungi were mainly affected by the contents of total phosphorus, available nitrogen and available phosphorus in soil. The order of soil quality of different artificial sand fixation shrub forest was as follows: Artemisia annua forest land, Caragana korshinskii forest land, sand willow forest land flow sandy land, which indicated that the establishment of different artificial sand fixation shrub forest could improve the desert soil quality. Among them, the mixed forest of poplar and firewood was the best to improve the comprehensive quality of soil.
【作者单位】： 内蒙古林业科学研究院;
【基金】：国家林业公益性行业科研专项(201404204) 内蒙古自治区自然科学基金项目(2016MS0371) 林业科技创新平台项目(2015-ZYPTDW-039)资助~~
【分类号】：S714
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本文编号：1626282