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《Journal of Southwest University(Natural Science Edition)》 2009-07
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Research on Hydrological Functions of the Soils with the Main Tree Populations in the Rocky Desertification Area of Chongqing——A Case Study of Nanchuan Demonstration Area of Chongqing

ZHOU Chen-ni,WEI HongSchool of Life Science,Southwest University,Key Laboratory of Eco-environments of Three Gorges Reservoir Region,Chongqing 400715,China  
The water-holding capacities in 2 main forest types(Pinus tabulaeformis Lamb and Cinnamomum(L.)Presel) in mountainous eco-system in Karst area of Chongqing were studied.The results showed that the litter storage of P.tabulaeformis(48.3 t/ha) was higher than that of Cinnamomum.Different vegetation types and different decomposition levels resulted in different storages.The litter storage,the wet litter standing crop and the dry litter standing crop of conifers were higher than those of broadleaf forests.The maximum water-holding percentage and water holding capacity of the semi-decomposed layer was higher than those of the non-decomposed layer of the same vegetation type,and the total water holding capacity and the water holding depth of P.tabulaeformis was much higher than that of Cinnamomum.In the water holding process,the litter of the two vegetation types showed a similar trend.Water absorption rate dropped sharply in the first 4 hours,and slightly thereafter and approached zero after 20 hours.The total water holding capacity increased logarithmically with increasing immersion time in water(y=aln(x)+b),and water absorption rate in all plantations decreased with increasing immersion time according to the equation y=a+bx-1.The total interception amount of P.tabulaeformis and Cinnamomum was 98.18 t/ha and 59.26 t/ha,respectively;and their total interception depth was 9.818 mm and 5.925 mm.The modified interception amount of the semi-decomposed layer was higher than that of the non-decomposed layer.Like the litter layer,the topsoil showed a similar pattern of the water-holding properties.i.e.the water-holding capacity of the soil of P.tabulaeformis forests was better than that of Cinnamomum forests.
【Fund】: “十一五”国家科技支撑计划项目(2006BAD03A1006-3)
【CateGory Index】: S714
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