Hydro-ecological Effects of Dendrocalamus latiflorus Stands

Three experimental stands of Dendrocalamus latiflorus Munro with different planting space,such as3m×4m,4m×5 m, and 5 m x6 m, were established on cutover of Chinese fir, in Nanjing county, Fujian Province, where the hydro-ecological effects of D. latiflorus stand have been monitored continuously for 4 years. The results showed that:(1) The canopy rainfall interception of D. latiflorus stand had a positive relationship with both precipitation and stand density; both the throughfall and stem flow had a positive relationship with precipitation, and a negative relationship with stand density. In D. latiflorus stand with density of 825 clump·hm-2, the canopy rainfall interception and its interception rate were 155.2 mm·year-1 and 14.61% ; the throughfall and its rate were 829.0 mm·year-1 and 78.11% ; and the stem flow and its coefficient were 77.3 mm·year-1 and 7.31%. (2) The litter of D. latiflorus stand had a potential ability to absorb water equaling to Z 8 times of its own dry mass. (3)The potential maximum soil water storage of D. latiflorus stand with three stand densities was 315.3-326.3 mm, which was less than that of Moso bamboo stands (367.9 mm). (4)Both the soil surface runoff and the sand loss of D. latiflorus stand had a positive relationship with precipitation and had a negative relationship with stand density. In D. latiflorus stand with density of 825 clump·hm-2, the soil surface runoff and soil erosion were 0.55, 0.45 times of that in D. latiflorus stand with density of 330 clump·hm-2 respectively, and the loss of the main nutrients such as NO3-,NH4+,PO43-and K+ were 0.58, 0.49, 0.36 and 0.49 times of that in D. latiflorus stand with density of 330 clump·hm-2 respectively.