间作条件下玉米根系固土力原位测定

农作物的根系对土壤的固持作用可以减少坡耕地的水土流失。本研究以云南主要农作物玉米为例，通过采用剪切箱和锚杆拉力计，在玉米的成熟期对单作和与大豆间作2 种种植方式下的玉米根系在10 cm 深度上的固土能力进行了原位测定。结果表明，当施加载荷为1.5 kN 时单作玉米根系位移为5.9 mm，与大豆间作下的玉米根系位移是3.15 mm，裸地的位移是7.26 mm。单作玉米根系滑动距离要明显高于间作玉米根系，说明间作种植模式下的玉米的固持土壤能力要强于单作玉米。

In-Situ Measurement of Fixing Capability of Soil by Corn Roots in Intercropping Condition

The crop roots could fix soil and reduce soil and water loss from arable upland. In this study, maize (Zea may), as a main cultivated crop in Yunnan province, was used to investigate the soil fixing capability by roots in 10 cm soil depth with different planting pattern, using anchor-shank tensiometer and self-designed shearing box. The results showed that: when a 1.5 KN load was applied, the displacement was 3.15, 5.9, 7.26 mm for intercropped maize roots, monocultured maize roots and bare soil, respectively. The displacement of monocultured maize roots was bigger than that of intercropped maize roots; this suggested that the intercropped maize was superior to monocultured maize in term of soil fixing capability.