RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2008, Vol. 17 >> Issue (5): 793-793.

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ON BENEFITS OF WATER CONSERVATION AND DROUGHTRESISTANCE BY THE TECHNIQUE OF CONTOUR HEDGEROW

CHENG Dongbing| CAI Chongfa   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-09-20

Abstract:

The coexistence of seasonal drought and soil and water losses is an important ecological problem in the Three Gorges Reservoir area now,which badly threatens the sustainable development of society and economy in the reservoir area.Contour hedgerow，a common and effective technique around the world,is often employed to restore plant cover on cultivated slope land and conserve water and soil resources.And it is considered as an available way to realize sustainable development of agroecosystem in the Three Gorges Reservoir area.Three hedges of 〖WTBX〗Leucaena leucocephala,Vitex negundo〖WTBZ〗 and 〖WTBX〗Coriaria sinica〖WTBZ〗 were selected to discuss the benefits to soil and water conservation and droughtresistance in this research. The results showed that the effect of sediment trapping and depositing by contour hedgerows was significant.The height of silt had increased to 80 cm and the gradient had been eliminated 20° after 10 years.Compared with the control,within the contour hedgerow treatments,soil organic matter increased from 52% to 65%,soil bulk density decreased from 14% to 17%, and soil noncapillary porosity increased from 135% to 216% especially.The effects of fertilizer maintenance and improvement under the contour hedgerow system were significant and soil structure was improved obviously.In dry season,surface soil water content within the contour hedgerow treatment was 123% higher than the control,which reflected the high capability of water conservation of contour hedgerow treatments.According to the effective thickness of soil layer of 60 cm,soil water total volumetric capacity in the treatments of 〖WTBX〗Leucaena leucocephala,Vitex negundo〖WTBZ〗 and 〖WTBX〗Coriaria sinica〖WTBZ〗 increased 271,257 and 247 mm respectively,which then improved the soil ability of droughtresistance greatly.Under the system of hedgeroworange, fruit setting percentage and average yield increased 12% and 15% respectively compared to the control.

Key words: Three Gorges Reservoir Area, contour hedgerow, water conservation, droughtresistance

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