双料沟垄组合覆盖对土壤水分时空分布的影响

The impact of the dual mulch combined with ridges and furrows on spatial and temporal distributoin of soil moisture

双料沟垄组合覆盖是适合于黄土丘陵沟壑区旱梯田作物栽培的一种全新覆盖方式。对该措施三种谷子密度的土壤水分时空分布规律进行了系统研究,结果表明,与地膜覆盖和对照相比,组合覆盖具有以下特点:1沟垄水分差异不显著;2时间变化动态滞后于对照,整个生长季土壤含水量均低于对照;3生育期总耗水量大于降水量,土壤水分处于亏缺状态,休闲期土壤储水对生育期耗水贡献很大。并就该项技术的具体应用提出了几点建议。

Dual mulching of ridges and furrows is a new measure suitable for crops grown on terrace dryland in hilly and gully regions of the Loess plateau. The systematic study on the spatial and temporal distribution of soil moisture at three planting densities of millet under the measure indicated that compared with plastic film mulching and control, the mesure showed the following characteristics: ① There was no significant differences in soil moisture between the ridges and furrows; ② The trend for soil moisture to vary with time in the treatments lagged behind that for the control whose soil moisture was always higher than those in the treatments during the whole growing season; ③ The consumption of water surpassed the rainfall during the growing season, thereby resulting in water shortage in soil, and thus the soil water in fallow period made a great contribution to the consumption of water during the growing season. Meantime, sevaral proposals were putforward as to the measures.