践踏强度对不同坪床结构狗牙根地上部生长的影响

在6种沙基结构坪床上建植狗牙根草坪,用特制践踏器进行4种强度的践踏处理。结果表明:轻度践踏对草坪草高度、盖度和密度的影响较小;中度和重度践踏对草坪会造成较大损伤,草坪的叶片长度和干重急剧下降,盖度和密度严重减少。不同坪床结构中,表土铺沙厚度为20~25 cm处理的草坪草植株生长较差;全土处理的草坪草,在不践踏时,生长较好,但是在践踏胁迫下,植株的干重、密度和盖度的变化幅度均较大;土表铺沙厚度为5~15 cm处理的草坪草在不践踏时生长较好,在践踏胁迫下,各指标的变化幅度较小。

Effect of trampling intenstity on the growth of bermudagrass in the different turf-bed types

Bermudagrass was planted in 2002 in 6 types turf-bed based on sand,which was trampled by 4 trample intensities during 2002-2004.The results showed that the height,cover rate and density were affected lightly at light trampling intensity,which can improve the turfgrass quality.The weight and length of the second and third expanding leaf from top significantly decreased at medium and heavy trampling intensity,which caused the cover rate and density decreased significantly.Among the turf-bed types,turfgrass growth was weak in the turf-bed types which had 20-25 cm sand above soil.Turfgrass in soil grew well without being trampled,but its weight,density and cover rate decreased significantly when being trampled.Turfgrass in the turf-bed types which had 5-15 cm sand above soil grew well without being trampled,and it changed little when being trampled.