黄土丘陵区水平沟耕作研究

Study of Level Furrow Cultivation in the Hilly Loess Region

对黄土丘陵区水平沟耕作的试验研究表明,水平沟耕作能够削弱坡度增大导致侵蚀量增大的作用,作物参与后可大大增强这种防护能力。就作物本身的防护能力而言,谷子最强,其次是马铃薯,再次是荞麦。水分利用效率为马铃薯>谷子>荞麦;三作物水分利用效率对坡度变化的反应敏感程度为马铃薯>荞麦>谷子。据此建议较陡坡地作物,应优先考虑谷子;马铃薯和荞麦宜尽量安排于缓坡地。

Experiment of level furrow cultivation has been done in the hilly loess region. The result shows that level furrow cultivation can reduce the amount of soil loss which increases with the increase of slope gradient. With regard to the abilities of crops to prevent soil loss, that of millet is the strongest, following by potato and buckwheat. The efficiency of moisture utilization of potato is higher than that of buckwheat which is higher than that of millet. With regard to the sensitivity of moisture utilization of crops to slope gradient, potato' s is more sensitive than buckwheat' s, and the buckwheat' s is more sensitive than millet' s. So millet should be considered when selecting crops in steeper sloping farmland, and potato and buckwheat should be selected in light sloping farmland.