科尔沁沙地苜蓿草地土壤酶活性的时空变化特征

发布时间：2018-06-19 22:29

本文选题：紫花苜蓿地 + 种植年限　；参考：《草地学报》2017年02期

【摘要】：在科尔沁沙地大田试验条件下,研究了不同种植年限(1~5a)苜蓿草地土壤脲酶和过氧化氢酶活性的时(年限)空(土层)变化特征,旨在探讨种植不同年限苜蓿对土壤生物化学性状的影响,为沙地苜蓿草地管理提供科学依据。结果表明:2种土壤酶活性都随着土层加深而降低,0~20cm土层,土壤酶活性最强,呈现出表聚性。随着种植年限增加,2种土壤酶活性都呈先增后降趋势。在0~70cm土层,土壤过氧化氢酶活性大小顺序为:2a5a4a1a3a;土壤脲酶活性大小顺序为:2a5a3a4a1a原生植被地。2年龄苜蓿草地根际土过氧化氢酶活性显著高于1年龄和3~5年龄(P0.05);2年龄和4~5年龄苜蓿草地非根际土过氧化氢酶活性显著高于1年龄和3年龄(P0.05)。不同种植年限苜蓿草地根际土过氧化氢酶活性均高于非根际土,其中,种植第1年至第3年土壤酶活性差异显著(P0.05)。
[Abstract]:Soil urease and catalase activities in alfalfa fields with different planting years were studied under field test in Horqin sandy land, and the temporal and spatial (soil layer) variation characteristics of urease and catalase activities in alfalfa grassland were studied. The purpose of this study was to investigate the effects of alfalfa cultivation on soil biochemical characteristics and to provide scientific basis for alfalfa land management in sandy land. The results showed that the enzyme activity of two kinds of soil decreased with the deepening of soil layer, and the soil enzyme activity was the highest and showed apparent aggregation. The activity of soil enzymes increased first and then decreased with the increase of planting years. In the 0~70cm soil layer, The order of soil catalase activity is: 1: 2a5a4a1a3a; the order of soil urease activity is: 2a5a3a4a1a primary vegetation land. 2 years alfalfa rhizosphere soil catalant enzyme activity is significantly higher than that of alfalfa grass at the age of 1 and 3 5 years. The activity of catalase in non-rhizosphere soil was significantly higher than that in age 1 and 3 (P 0.05). The catalase activity of alfalfa rhizosphere soil was higher than that of non-rhizosphere soil, and the difference of soil enzyme activity from the first year to the third year was significant (P 0.05).
【作者单位】：内蒙古民族大学农学院;中国农业大学;
【基金】：内蒙古自然科学基金项目(2015MS0337) 内蒙古自治区社会发展领域科技计划项目(201502104) 重点牧区草原"生产生态生活"配套保障技术集成与示范(2012BAD13B00)资助
【分类号】：S812.2

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