论文部分内容阅读
土壤酶活性可用于衡量土壤养分供应能力及土壤质量,而其季节变化可反映养分供应与植物需求的耦合关系。以马家塔矿复垦地为研究对象,对不同植物群落下土壤酶活性的季节变化进行了监测,结果表明:复垦土壤的表层过氧化氢酶、脲酶、磷酸酶和蔗糖酶活性均显著高于下层和对照的原状土壤,说明复垦可以提高土壤的酶活性。不同植被下土壤的酶活性大小总体上以苜蓿、油蒿、桧柏和侧柏对土壤质量的贡献较大。4种酶活性的动态变化趋势基本相同,都表现为前期先增加,增加到最大值后又开始下降,总体上均以夏季(7-8月份)活性最高。酶活性的变化和大小可以体现有机质含量的变化和转化方向,也能体现基础氮素的变化方向,复垦后酶活性提高,但是和农田土壤相比还有一定差距,所以复垦工作还需继续开展。
Soil enzyme activity can be used to measure soil nutrient supply capacity and soil quality, and its seasonal variation can reflect the coupling between nutrient supply and plant demand. The results showed that the activities of catalase, urease, phosphatase and invertase in surface soil of reclaimed soil were all significantly increased with the reclamation of Majiata Mine as the research object, and the seasonal changes of soil enzyme activity under different plant communities were monitored. The undisturbed soil above the lower and the control, indicating that reclamation can improve soil enzyme activity. Soil enzyme activities under different vegetations generally contributed greatly to soil quality with alfalfa, Artemisia ordosica, Cypress and Platycladus orientalis. The trends of the dynamic changes of the four enzyme activities were basically the same, all of which showed that the activity of the four enzymes increased first and then decreased after reaching the maximum value, and the activity was highest in summer (July-August) as a whole. Changes in enzyme activity and size can reflect changes in the content of organic matter and the direction of transformation, but also reflect the direction of the basic changes in nitrogen, enzyme activity after reclamation increased, but there is still a gap compared with farmland so the reclamation work also needs Continue to carry out.