Eco-hydrological Function of Forest Floors in Schima superba and Cunninghamia lanceolata Plantations
Guo Jianfen, YangYusheng(School of Geography Science, Fujian Normal University, Fuzhou 350007, P. R. China); Lin Peng(School of Life Science of Xiamen University)
The eco-hydrological functions of forest floors in terms of rainfall interception and soil and water conservation were studied in Schima superba (SS) and Cunninghamia lanceolata (CF) plantations in Jian′ou, Fujian Province. Result showed that there are distinct differences in rainfall interception among three treatments in the two plantations. Rainfall interceptions for treatment 1, 2 and 3 in the CF plantation were 16.55%, 16.26% and 21.17% higher than those in the SS plantation, respectively. Simulation experiments with minitype plots inside and outside the forests indicated that the effects of forest floor on reducing runoff and sediment yield are very significant. Runoff (385.62, 682.76mm) increased by 1.61 and 1.79 times and sediment yield(668.95, 1116.70kg·hm~ -2 ) by 2.46 and 2.52 times respectively after forest floors were removed in the SS and CF plantations. Outside the SS plantation, runoff and sediment yield both decrease significantly after covered with litter. Runoff depth under different treatments ranged from 351.43mm for treatment Ⅲ to 519.47mm for treatment Ⅰ, being 40.15%~59.34% of that of the control (uncover litter). The sediment yield for treatment Ⅰ, Ⅱ and Ⅲ were 2757.07, 1746.33 and 936.66kg·hm~ -2 , respectively, being 24.81%, 15.71% and 8.43% of that of the control.