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| Law of soil loss at agro-forest ecosystem of Castanea mollissima |
| Yuan Zhengke1, Yuan Suibo1, Yao Min1, Tian Yuxin1, Liu Wenduan2 |
| 1.Hunan Academy of Forestry, 410004, Changsha;2.Hengyang Forestry Bureau, 421000, Hengyang: Hunan:China |
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Abstract By means of a fixed observation station of runoff plot, soil loss amount at 7 different agro-forest ecosystems were recorded and analyzed successively for 8 years, in order to find out the space-time variation law of soil erosion at different agro-forest ecosystem of Castanea mollissima in low hilly region of red soil. The results showed that soil loss amount slowly reduction, sharply reduction and become stable occurred at the following 3 stages respectively, young intercropped Castanea mollissima forest, crown fast-growing stage without intercrop, and stand closed stage. The soil loss ranged from 2.25 t/hm2 to 3.31 t/hm2, but from 32.91% to 45% less than that at CK in the current year of intercropped. When the stand became closed (at the third stage), the soil loss was less than 0.05 t/hm2. There were much differences of soil loss among the 10 to 70 mm rainfalls daily. Intercropped plant covering surface land is important for erosion control among the 10 to 70mm rainfall daily.
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Received: 23 March 2005
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