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在黄土高原的沟壑、丘陵和山区,整地不仅是一项重要的营林措施,也是一项投工少而效果显著的水土保持工程。特别是七十年代前后大力推广的反坡梯田整地方式,更显著地改善了土壤的水分状况和理化性质,从而提高了造林成活率和幼树长势。为了了解这种整地方式能否较稳定、长期地发挥良好的效益,我们于1984年4—5月,在黄土高原的不同自然地理类型区,选设有代表性地点,进行了系统的调查研究。一、调查研究的内容与方法(一)调查地点选择
In the gully of the Loess Plateau, hills and mountains, soil preparation is not only an important forest management measure, but also a small and effective project of soil and water conservation. In particular, the method of site preparation for the anti-sloping terraces vigorously promoted before and after the 1970s improved the soil moisture status and physicochemical properties significantly, thus improving the survival rate of afforestation and sapling growth. In order to understand whether this method of site preparation is stable and long-term good effect, we conducted a systematic survey in April-May 1984 in different natural geographical areas of the Loess Plateau, setting up representative sites . First, the contents and methods of investigation (A) survey site selection