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| Study on appropriate density of <i>Pinus tabulaeformis</i> and <i>Robinia pseudoacacia</i> for soil and water conservation forests in Loess area |
| Zhang Jianjun,He Wei,Na Lei |
| College of Soil and Water Conservation,Beijing Forestry University,Key Lab.of Soil & Water Conservation and Desertification Combating,Ministry of Education,100083,Beijing,China |
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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.
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Received: 10 May 2006
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