摘要
对毛乌素沙地榆林沙区6种不同人工固沙林土壤养分、微生物及酶活性进行了测定和分析,结果表明:建立人工植被后,土壤养分、微生物数量、酶活性均有显著改善。各林地的土壤养分、微生物和酶活性差异显著,花棒和踏郎混交林地土壤有机质含量、微生物数量、脲酶活性高于其他林地,分别为5.15 g.kg-1、21.75×105个.g-1、1.48μg.g-1,其中土壤微生物的数量是踏郎纯林的4倍;樟子松林土壤放线菌和真菌数量较多,而土壤有机质和土壤脲酶活性偏低;沙柳林的土壤碱性磷酸酶和蔗糖酶活性较高,达到2.35 mg.g-1和14.10 mL.g-1。土壤微生物和土壤酶与土壤养分关系紧密,其中,土壤细菌数量、土壤脲酶、蔗糖酶、碱性磷酸酶、过氧化氢酶活性与土壤有机质相关显著。
Soil nutrients, microorganism, and enzymes activities of 6 kinds of typical artificially sandlandfixing vegetation in the sand areas of Yulin were measured. The results showed that after artificial plantations were set up, soil nutrients, biology properties of artificial vegetation had been improved greatly, the enzyme activity was strengthened significantly. The soil nutrient, microorganism and enzyme activity were different in different vegetations. The soil nutrients and bacterium numbers and the soil urease activity under Hedysarum scoparium X H. mongolicum were 5.15 g·kg^-1 ,21.75 × 10^5 · g^-1 , and 1.48 μg·g^-1 respectively, higher than those in structure H. mongolicurn. The number of actinomyces and fungi under Pinus sytvestris var. mongolica was the biggest, but soil organic matter and urease were low. The activity of soil alkaline phosphatase and catalase under Salix psarnrnophila was higher than others, which were respectively 2. 35 mg · g^-1 , 14.10 mL · g^-1. Close ralationship existed among soil microorganism quantity, enzyme activity and soil nutrient content, from which the content of soil organic matter was significantly correlated to soil bacterium quantity, alkaline urease, sucrace, phosphatase, catalase activity, and soil nutrient content.
出处
《西北林学院学报》
CSCD
北大核心
2008年第3期12-15,20,共5页
Journal of Northwest Forestry University
基金
国家自然科学基金项目(40171061)
