【摘要】 以黄土区刺槐和油松水土保持林为研究对象,在对水分循环要素进行长期监测的基础上,以水分亏缺量为依据,利用径流林业的基本原理,结合林分调查结果,提出了利用胸径计算刺槐和油松林合理密度的公式。利用该密度参考值管理刺槐和油松水土保持林,可以保证林木正常生长所需水量,不会造成林地土壤干化。同时以刺槐和油松林地的土壤水分含量、最低含水量和难效水频率为指标,提出了黄土区适宜的刺槐和油松水土保持林的管理密度。更多还原

【Abstract】 Based on a long-term monitoring of water cycle in forest stands,the soil moisture deficit in soil and water conservation forests of Pinus tabulaeformis and Robinia pseudoacacia forests was calculated.Following the principles of runoff-collecting forestry,and applying the forest structure investigation results,the author brought forward a formula to calculate appropriate density for forests on the base of diameters at breast height.Using this method to manage forests,the natural water requirement of forests could not only be ensured,but also the soil drought be avoided.In addition,with the long-term monitoring of soil moisture in forest stands,the author also brought forward the appropriate managing density specific to the soil and water conservation forests of Pinus tabulaeformis and Robinia pseudoacacia trees in Loess area,with soil moisture content,the lowest soil moisture content and invalid moisture frequency as the index.更多还原