渗水地膜对玉米水分利用效率的影响

为了研究不同覆盖材料对土壤水热和作物水分利用效率的影响,对覆盖渗水地膜、普通地膜和秸秆相对于裸地不覆盖的效果进行了研究。研究发现覆盖渗水地膜在作物生育期具有明显的增温和保水作用,耕层土壤平均温度较裸地和覆盖秸秆提高1.09℃和2.59℃,但较覆盖普通地膜降低1.55℃。覆盖渗水地膜耗水量较覆盖普通地膜低26.7mm,并在后期干旱季节使土壤水分分布均匀。覆盖渗水地膜作物水分利用效率较不覆盖、覆盖秸秆和覆盖普通地膜分别提高8.17kg/(hm~2·mm),4.50kg/(hm~2·mm),3.71kg/(hm~2·mm)。

Effect of Soil Surface Covered by Water-Permeability Film on Water Use Efficiency of Corn

The film covering the soil surface increases the soil water content,but sometimes it also hinders the runoff into soil.We have carried out this research in order to study the effect on distribution of soil water and heat for different materials.Results show that water-permeability film has the efficient to increase the soil moisture and temperature during the corn growth period,but that was less than the ordinary film,the soil temperature were 1.09℃ and 2.59℃ more than that of bare land and straw mulch,respectively,but it was 1.55℃ less than ordinary film mulch.The water consumption of water-permeability film mulch was 26.7 mm less than ordinary film mulch.And the moisture of soil covered with water-permeability film was uniformly distributed during the dry season.Corn water use efficiency of the soil covered water-permeability film increased by 8.17 kg/(hm2 · mm),4.50 kg/(hm2 · mm),and 3.71 kg/(hm2 · mm) than those of the bare land,straw mulch,and ordinary film mulch,respectively.