不同覆盖物下的农田地温和蒸发量对比

Comparison of Ground Temperature and Evaporation Capacity under Different Cover in Farmland

为了进一步搞清不同覆盖物的保温效果以及农田水分利用率,特别以裸地为对照,对"砂石+地膜"、砂石、"裸地+地膜"3种覆盖方式进行了对比研究。试验结果表明,3种覆盖方式中"砂石+地膜"覆盖的保温效果最好,且水分利用率最高;其次是砂田,"裸地+地膜"。因此,建议在有充足的砂石来源基础上的干旱地区或有限灌溉地区,甚至是在低温年份应推广应用"砂石+地膜"覆盖,对保证作物出苗以及作物的正常生长都有重要意义。

In order to find out the insulation effect of different cover further,as well as the extent of water use efficiency,especially for this problem this paper＋plastic film on the sand and gravel,gravel,bare ground＋three kind of plasticfilm mulching,as well as bare controls were compared.The results showed that：three ways gravel cover ＋ plastic film covering the thermal insulation effect of the best and the highest water use efficiency,followed by sand fields,and bare land＋followed by plastic film mulch.So,it is recommended adequate sources of sand and on the basis of limited irrigation inarid regions or areas,or even years at low temperatures should promote the use of sand and gravel ＋ plastic mulching,crop emergence,as well as for ensuring the normal growth of crops are important.