Estimation of temporal variation in splash detachment in two Japanese cypress plantations of contrasting age

摘要: To elucidate splash erosion processes under natural rainfall conditions, temporal variations in detachment were observed using a piezoelectric saltation sensor (H11B; Sensit Co., Portland, ND, USA). Preliminary laboratory tests of suggested that they suitable for field observations. Field observations conducted between July and September 2006 21- 36-year-old Japanese cypress (Chamaecyparis obtusa) plantations with mean stand heights 9·2 m 17·4 m, respectively. Splash (in g m−2) was measured seven times cups, raindrop kinetic energy J m−2 mm−1) both stands laser drop-sizing (LD) gauges. installed to record counts, which converted data (splash rate; m−2 10 min−1) the relationship counts. Surface runoff monitored plots 0·5 m width 2·0 m length obtain flow depth millimeters). Both total larger older stand. Increased rates per unit throughfall found after rainless durations longer than approximately one day stands. However, lower rate 21-year events. During extreme rainstorms, showed low decline rate, while 36-year higher increased depth. The proved be useful means conditions. Copyright © 2010 John Wiley & Sons, Ltd.