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| Water conversation function of the mixed <i>Alnus cremastogyne</i> and <i>Cupressus funebri</i>s stand ecosystem at different stand age |
| Wu Pengfei<sup>1,2</sup>,Zhu Bo<sup>1</sup> |
| 1.Institute of Mountain Hazards and Environments,Chinese Academic of Sciences;2.College of Life Science and Technology,Southwest University for Nationalities: 610041,Chengdu,China |
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Abstract The water conservation is one of the important functions of forest ecosystem.The mixed <i>Alnus cremastogyne</i> and <i>Cupressus funebri</i>s stands at 10 a,15 a,20 a and 25 a and the 30 a cypress stand in the hilly area of central Sichuan Basin were investigated to study the change tendencies of water conservation function.The results showed that: 1) The accumulation mass,saturated water holding capacity and maximum water holding capacity of the litter layer reached the maximum at 20 a,and decreased to the minimum at 30 a.The water holding capacity correlated with the accumulation mass and the water holding rates significantly;2) The bulk density of the topsoil declined significantly from 10 a to 20 a and reached the minimum 1.20 g/cm<sup>3</sup>,but increased significantly from 20 a to 30 a.The non-capillary porosity and total porosity increased from 10 a to 20 a but declined significantly after 20 a.The capillary porosity fluctuated from 10 a to 30 a.The minimum water-holding capacity and capillary water-holding capacity increased significantly from 10 a to 15 a and relatively stabilized from 20 a to 30 a,and the maximum water-holding capacity increased from 10 a to 20 a and decreased at 25 a or 30 a,significantly;3)The total water-holding capacity of the mixed stands reached the maximum,1 446.06 t/hm<sup>2</sup> at 15a and then declined to 1 331.60 t/hm<sup>2</sup> at 30 a.The soil water-holding capacity accounted for more than 98% of the stands total water-holding capacity at different stand age.The results indicated that the structures of the mixed stands older than 25 a and the cypress stand should be adjusted to enhance the water conservation function.
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Received: 31 October 2007
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