摘要:在根系土壤不同深度铺设不同开孔度薄膜的条件下，以黑麦草为试材，通过盆栽试验研究了根层铺多孔膜对土壤水分的影响。结果表明：根层铺多孔膜改变了根系层土壤水分分布，铺设深度为15 cm时，土壤含水量随深度的增加先增大后减小，铺设深度为20 cm时，土壤含水量呈“3”形分布，同一铺设深度不同开孔度的土壤水分分布较为相似，且土壤含水量最大值出现在覆膜深度以下5 cm处；当土壤含水量降至灌溉下限时，根层铺多孔膜各处理表层（0～5 cm）及膜上土壤平均含水量较裸土处理分别减小了37.6%～51.1%和26.2%～37.0%，膜下土壤平均含水量较裸土处理增大了7.7%～25.0%；在观测时段内，根层铺多孔膜各处理中，除铺设深度15 cm、开孔度30%的处理0～30 cm深度土壤储水量变化值大于裸土处理15.2%外，其他处理均小于裸土处理，其中铺设深度15 cm、开孔度50%的处理较裸土处理减小了23.0%，表明根层铺多孔膜技术具有较好的节水效果。

关键词:根层  多孔膜  土壤水分

AbstractUnder the conditions of porous film mulching at different soil depth and hole rate, a pot experiment was carried out to study the effect of porous film mulching in root zone (PFMRZ) on soil moisture by using ryegrass as the material. The results showed that PMMRZ changed the distribution of soil moisture in root zone. When the porous film was laid in depth of 15 cm, soil water content increased first and then decreased with the increase of depth; when it was laid in depth of 20 cm, the distribution of soil water content appeared the shape of “3”. The same laying depth with different hole rate led to similar soil moisture distribution, and the maximum of soil moisture content appe ared at 5 cm below the porous film. When soil water content went down to the lower limit of irrigation, the average soil water content in surface soil (0～5 cm) and soil above porous film reduced by 37.6%～51.1% and 26.2%～37.0% respectively, while the average soil water content below porous film increased by 7.7%～25.0%, compared with no mulch treatment. During the observation period, the change values of average soil water storage at 0～30 cm depth of PMMRZ treatment s were less than that of no mulch treatment except for the treatment with laying depth of 15 cm and hole rate of 30%. Among them, the PMMRZ treatment with laying depth of 15 cm and hole rate of 50% decreased the change value of average soil water storage by 23.0% compared to no mulch treatment, showing a remarkable water-saving effect.

Key wordsroot zone  porous film  soil moisture

文章编号： 0258_7106 (2016) 01_0018_15 中图分类号： P618.41 文献标志码：A

投稿时间：2012-07-13修订日期：2012-11-14 改回日期：2015_07_11

基金项目

**通讯作者耿新霞， 女， 1979年生， 助理研究员， 成矿规律研究方向。 Email： gen gxinxia@cags.ac.cn