青海湖东沙化治理过程中土壤酶活性及养分含量特征

发布时间：2018-03-24 22:11

本文选题：沙化治理　切入点：脲酶　出处：《草业科学》2017年07期

【摘要】：本研究以青海湖东沙化治理区建植5年所形成的披碱草(Elymus dahuricus)、碱茅(Puccinellia distans)和早熟禾(Poa annua)栽培草地为研究对象,通过测定土壤有机质、氮、磷、钾养分含量以及脲酶、过氧化氢酶和转化酶活性,探讨了在高寒干旱沙化生态系统中不同草本植物作用下土壤养分和土壤酶的变化特征及其相互关系。结果表明,1)人工治沙植被作用下,土壤养分和土壤酶活性均显著提高(P0.05);2)早熟禾在青海湖区域治沙过程中对土壤有机质、碱解氮、速效磷、全钾和速效钾的改良效果显著(P0.05);3)在3种栽培草地处理下土壤脲酶活性在表层土壤中普遍显著高于流动沙丘对照(P0.05),披碱草和早熟禾栽培草地的脲酶活性较高,0-20cm土层中土壤过氧化氢酶活性在3个栽培草地中均显著高于对照(P0.05),且早熟禾栽培草地中土壤过氧化氢酶活性最高,土壤转化酶在各栽培草地间差异不显著(P0.05);4)各栽培草地中土壤脲酶和过氧化氢酶普遍与土壤中的碳氮磷养分存在显著相关性(P0.05),可以作为沙化治理过程中评价土壤恢复的有效指标。
[Abstract]:In this study, the cultivated grasslands of Euphorbia dahuricusi, Puccinellia distansa and Poa annua, which were formed after 5 years of cultivation in the eastern desertification control area of Qinghai Lake, were studied. The contents of soil organic matter, nitrogen, phosphorus, potassium and urease were measured. The changes of soil nutrients and soil enzymes under the action of different herbaceous plants in alpine arid desertification ecosystem were studied. The results showed that: 1) under the action of artificial sand control vegetation, the changes of soil nutrients and soil enzymes were studied. Soil nutrients and soil enzyme activities increased significantly (P 0.05) POA had a significant effect on soil organic matter, alkali-hydrolyzed nitrogen and available phosphorus in the process of desertification control in Qinghai Lake region. Soil urease activity in surface soil was significantly higher than that in mobile sand dune control (P0.05). The soil urease activity was higher in the cultivated grassland of Elaeagnus hypestris and Kentucky bluegrass than in the 0-20cm soil layer. The activity of catalase in middle soil was significantly higher than that of control P0.05in three cultivated grasslands, and the activity of catalase in Kentucky bluegrass was the highest. There was no significant difference between soil invertase and soil nitrogen, nitrogen and phosphorus nutrients among different cultivated grasslands (P 0.05). There was a significant correlation between soil urease and catalase and soil carbon, nitrogen and phosphorus nutrients, which could be used as an effective index to evaluate soil recovery in the process of desertification control.
【作者单位】：青藏高原优良牧草种质资源研究省级重点实验室青海大学畜牧兽医科学院;
【基金】：青海省青藏高原优良牧草种质资源利用重点实验室(2017-ZJ-Y12) 青海湖流域沙化土地综合治理技术集成示范(2016-HZ-822) 现代农业产业技术体系建设专项资金(CARS-35-41)
【分类号】：S812.2

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