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一、引言西北黄土区是水土流失极为严重的地区。营造森林可以增加坡地被复,改良土壤,改善气候,是水土保持重要措施之一。为了能够作出更正确的营林设计,和掌握可靠的造林技术,以达到充分发挥森林改良土壤措施的保水保土作用。我们于1954开始在绥德辛店沟(属黄土丘陵沟壑区第一副区)、天水吕二
I. INTRODUCTION The Loess Area in Northwest China is an area where soil erosion is extremely serious. It is one of the important measures to conserve water and soil by creating the forest that can increase the slope, improve the soil and improve the climate. In order to be able to make a more correct design of silviculture and to have reliable afforestation techniques in order to achieve the soil and water conservation and soil conservation by giving full play to forest improvement measures. We started in 1954 in Suidexindian ditch (a loess hilly and gully area is the first deputy district), Tianshui Lu two