连翘不同种植模式根系土壤水分动态研究

以三峡库区南沱镇为试验基地，研究了干旱胁迫下连翘不同种植模式根系土壤水分动态。结果表明：在连续伏旱的情况下，连翘林下种草的土壤含水量递减率均小于连翘林下不种草的土壤含水量递减率；随着坡度的增加，种草与不种草处理间土壤含水量及土壤含水量递减率之间的差异变小；从连翘根部随水平距离增加其土壤含水量呈逐渐下降趋势，对于2～3a生的连翘其最佳保持水分的范围是在距根部45cm范围内

DYNAMICS OF SOIL MOISTURE IN THE ROOT ZONE OF FORSYTHIA SUSPENSA (THUMB ) VAHL WITH DIFFERENT CROPPING SYSTEMS

The dynamics of soil moisture in the root zone of Forsythia suspensa (Thumb) Vahl. plants was studied at the experiment base at Nantuo Town in the Three-Gorges Reservoir Region of Chongqing. With successive drought spells in mid-summer, the rate of diminishing soil moisture was smaller in the cropping system where grasses were grown under the F. suspensa shrubs than in the system without grass growing. The difference in the rate of diminishing soil moisture between the two systems became smaller as the slope of the land increased. Soil moisture tended to decrease with the increase in the horizontal distance from the F. suspensa plants. For 2- or 3-year-old F. suspensa plants, the optimum range for water conservation was within 45 cm from their roots.