不同林龄樟子松根际与非根际土壤的对比

文中对章古台不同林龄樟子松固沙林根际土壤和非根际土壤进行了对比研究,结果表明:随林龄增长,其根际土壤和非根际土壤pH值表现为下降趋势 根际土壤有机质含量较非根际土壤有机质提高的幅度以中龄林阶段最高,近熟林阶段次之,在幼龄林阶段最小;在幼龄林时,根际土壤的CEC值与非根际土壤相近,而在中龄林和近熟林阶段均小于非根际土壤;在幼龄林时根际土壤中盐分积累的程度最高,随林龄增长根际土壤中盐分积累程度逐渐下降;在不同发育阶段,根际土壤全N、速效N、速效K含量均高于非根际土壤,而速效P含量均低于非根际土壤 随林龄增长,樟子松根际和非根际土壤中细菌数量占总菌数的百分比下降;在不同的发育阶段,根际土壤中酶的活性均高于非根际土壤

Comparative Research on Rhizosphere Soil and Non-rhizosphere Soil Properties in Differrent Stand Age of Pinus sylvestris var.mongolica Sand-fixation Forest

This paper mainly dealt with the rhizosphere soil properties in different stand age of Pinus sylvestris var.mongolica sand-fixation forest. The result showed that the pH value of rhizosphere soil and non-rhizosphere soil were on the decline from beginning to end. The content of organic matter of rhizosphere soil were higher than those of non-rhizosphere soil in different stand age . The CEC value of rhizosphere soil was lower than that of non-rhizosphere soil in half-mature stage and near-mature stage. The extent of soluble salt accumulation of rhizosphere soil decreased with the increase of stand age. The content of total N, available N and available K of rhizosphere soil were higher than those of non-rhizosphere soil at different stand age , while the content of available P of rhizosphere soil was lower than that of non-rhizosphere soil and the extent of deficiency of available P of rhizosphere soil was also on the increase with stand age. The percentage of bacteria in all microorganisms of rhizosphere and non-rhizosphere soil decreased with the increase of stand age. The activity of different kinds of enzymes of rhizosphere soil was higher than those of non-rhizosphere soil.