Soil Macropore Characterisics Under Citrus Land in Jiangjin City,Chongqing
Soil macropore characteristics under different citrus land in Jiangjin city of Chongqing was analyzed by using brilliant blue dye method,water breakthrough curve and Poiseulle equation.The results showed that the steady effluent rate of the dye-stained area was more than 1.48 times higher than the dye-unstained area and the ratio become higher with soil depth.Water breakthrough curves in the dye-stained area had a bigger fluctuation than that in the dye-unstained area.The radii of soil macropores were from 0.3 mm to 1.7 mm.Radii（0.3~0.7 mm） had little effect on preferential flow despite the 104 magnitude.The macropores with radii larger than 0.7 mm was the main factor affecting the preferential flow.At the 10-20 cm soil layer,the number of soil macropores under 20-year-old citrus land was larger than that under 10-year-old citrus land.The macropores with radii larger than 1.0 mm was the main preferential flow path in the initial stage of water input.The macroporosity was positively（P0.01） related to the steady effluent rate in the range from 1.5% to 19.5% which contributed 71.9% to the variance of steady effluent rate.The macropores with radii larger than 0.7 mm was positively（P0.01） related to the steady effluent rate which contributed 90.9% to the variance of steady effluent rate.
国家科技期刊平台
NSTL
万方数据
维普
