| Effects of porous film mulching in root zone on soil moisture |
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| DOI：10.7606/j.issn.1000-7601.2013.04.004 |
| Key Words: root zone porous film soil moisture |
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| Abstract: |
| Under 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. |
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