Effects of Different Operations and Management Modes on Soil Water Holding Capacities and Infiltration Characteristics in Phyllostachys edulis Forests

The water holding capacities and the infiltration characteristics were measured in Phyllostachys edulis forests with different operations and management modes in Yongan County,Fujian Province.The results showed that the water holding capacities were affected by different operations and management modes.The maximum water holding capacity was 3 498.33 t·hm-2 in forestⅡ(shoot digging+ herb chopping+ special fertilizer),3 333.33 t·hm-2 in forest Ⅲ(shoot digging+ herb chopping+ special fertilizer+ irrigation),and 3 254.00 t·hm-2 in forest Ⅰ(shoot digging+ herb chopping).The capillary water holding capacity was 2 806.67 t·hm-2 in forestⅠ,2 728.00 t·hm-2 in forest Ⅲ,and 2 638.33 t·hm-2 in forestⅡ.The water holding capacity in non-capillary pore,which was closely related to the infiltration characteristics,from high to low was forestⅡ(860.00 t·hm-2)Ⅲ(605.33 t·hm-2)Ⅰ(447.33 t·hm-2).The sequence of infiltration characteristics of soil were ⅡⅢⅠ,while all of them was decreased with the increase of soil depth.In forest Ⅱ,the average of initial infiltration rate,stable infiltration rate,average infiltration rate and accumulative infiltration were respectively 10.733 9,7.677 8,8.939 4 mm·min-1 and 354.227 8 mL·cm-2,while just 1.861 6,1.211 8,1.453 5 mm·min-1 and 33.575 8 mL·cm-2 in forestⅠ.The operations and management modes influenced the infiltration capability of different depth soils differently,especially the soil surface.The process of soil water infiltration could be simulated well by Kostiakov model,and its R2 was ranged 0.840 9 to 0.976 0.