黄土坡地经济林大鱼鳞坑膜下滴灌技术研究

黄土高原丘陵沟壑区坡地经济林营造中，采用大鱼鳞坑坑内打孔覆膜、膜下滴灌技术，解决了本区干旱坡地经济林造林成活率低、生长慢、发育迟的难题。可使坡地杏树造林成活率提高到96％，枣树造林成活率提高到92％；成林后，鱼鳞坑汇集径流可使降水利用率提高到42．5％，加上旱季节水包膜下补灌，避免了土壤板结，降低了土壤水分蒸发，可使杏、枣产量比穴灌分别提高10．32％和19．61％。

RESEARCH ON THE TECHNIQUE OF DRIP IRRIGATION UNDER FILM FOR CASH-TREES PLANTED IN FISH-SCALE PITS ON LOESS SLOPE-LAND

The technique that digging holes and covering film in big fish-scale pits and drip irrigation under film can solve the problems about the low survival percentage, the slow growth and the late development of the cash trees on the arid slope-land planted on the hilly and gully area of loess planteau. The results showed that the apricot's percentage of survival increased to 96%, and the jujube's percentage of survival increased to 92%. The fish-scale pit collected runoff so as to increase the utilization ratio of rainfall, about to 42.5%, moreover, drip irrigation under film with saving water bag refrain the soil from compactness, and decreased the evaporation of soil, which increased the yield of apricot and jujube respectively 10.32% and 19.61% comparing with control.