| 摘要: |
| 【目的】探讨固沙林土壤的生物性质,为制订合理可行的保持沙地森林持续经营的管理措施提供参考。【方法】以流沙地为对照,对毛乌素沙地榆林沙区6种主要人工固沙林(花棒×踏郎混交林、沙柳林、踏郎林、沙棘林、樟子松林、河北杨林)林地0～5,5～20,20～40 cm土层的土壤细菌、放线菌、真菌数量及4种酶(过氧化氢酶、蔗糖酶、碱性磷酸酶、脲酶)活性进行了研究,并对土壤微生物数量及酶活性相关性进行了分析。【结果】不同固沙林林地土壤微生物生态分布特征和酶活性表现出一定的差异。在0～5 cm土层中,花棒×踏郎混交林林地土壤细菌数量最多,樟子松和沙棘林林地0～20 cm土层放线菌、真菌数量均较多。在0～5 cm土层,花棒×踏郎混交林林地土壤碱性磷酸酶活性最强,沙柳林林地土壤过氧化氢酶活性最强,河北杨林林地土壤蔗糖酶和脲酶活性均最高。各种人工固沙林林地土壤细菌数量和酶活性总体上均随着土层深度的增加而递减;土壤细菌和放线菌的数量与过氧化氢酶、蔗糖酶、碱性磷酸酶活性具有显著或极显著的相关性。【结论】人工植被建立后,土壤微生物数量增加,酶活性增强,土壤的生物性质得到改善,流沙开始朝着土壤肥力水平较高的方向发展。 |
| 关键词: 人工固沙林 土壤微生物 土壤酶活性 毛乌素沙地 榆林沙区 |
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| 基金项目:国家自然科学基金项目(30670339) |
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| Soil microorganism and enzyme activities under different artificial sand-fixing vegetations in the sandy area of Yulin |
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| Abstract: |
| 【Objective】 The study explored the biological property of the sand-fixing vegetation soil in order to provide reference for seeking reasonable and feasible management measures of sandy forest. 【Method】 Take the wind-drift sand as the comparison,the soil bacteria,antinomies,fungus and catalase,sucrase,alkaline phosphatase,urease activities of 6 kinds of typical artificial sand-fixing vegetations in 0―5,5―20,20―40 cm soil layers in the sandland areas of Yulin were studied,and the soil microorganism quantities and the enzyme activities relevance were analyzed. 【Result】 The result indicated that the number of soil microorganisms and the enzyme activities varied in different forest lands.The bacteria under Hedysarum scoparium×Hedysarum mongolicum numbered most in 0―5cm soil layer.The soil antinomie and fungus numbers under Pinus sytvestris var.mongolica and Hippop haerhamnoides were the highest in 0―20cm soil layer.In the 0―5cm soil layer,the activity of soil alkaline phosphatase under Hedysarum scoparium×Hedysarum mongolicum and soil catalase of Salix psammophila,soil urease of Ponulus hopeiensis was bigger than those of others.Soil enzymatic activities decreased with soil depth.The correlations were significant between the quantities of soil bacterium,antinomies and the activities of catalase,sucrase,alkaline phosphatase. 【Conclusion】 After artificial plantations were established，the soil microorganism quantities were increased greatly,the enzyme activities were strengthened significantly,and the soil biological properties were improved obviously. |
| Key words: artificial sand-fixing vegetation soil microorganism soil enzymes activity Maowusu sandland sandy area of Yulin |
