杉木沙床容器育苗的水分、电导率及温度平衡能力

Balance Ability among Water, Conductivity and Temperature of Container Seedling in Sand Bed of Cunninghamia lanceolata

沙床容器育苗是目前广西杉木(Cunninghamia lanceolata)育苗的重要方式,本文从轻基质水分、电导率和温度等方面比较沙床和托盘育苗2种方式之间的差异,探讨沙床在杉木容器育苗中的水分、电导率和温度平衡能力。结果表明:晴天和阴天时,轻基质水分含量呈递减趋势,沙床中轻基质杯水分含量降低幅度极显著低于托盘;雨天时,托盘中轻基质水分含量极显著高于沙床,沙床有利于排出轻基质杯中多余水分。沙床对轻基质杯中的养分具有一定的保持作用,可减缓轻基质杯中的养分流失速率,这种保持作用在距离施肥稍长一段时间表现尤为明显。轻基质杯中温度比空气温度低1～2℃,3种天气情况下,沙床中轻基质杯中的温度均高于托盘,沙床具有一定的保温作用。

Container seedling in sand bed is an important seedling-raising method of Cunninghamia lanceolata at present in Guangxi. The differences between placing the containers in sand bed and in pallets were comparative studied in terms of water,conductivity and temperature of light media. The balance ability among water,conductivity and temperature of container seedling in sand bed of C. lanceolata were researched. Results showed that the water content of light media had a descending trend in clear days and cloudy days,and the water content of light media in sand bed was extremely significant lower than that in pallets. In rainy day,the water content of light media in pallets was extremely significant higher than that in sand bed,and sand bed was beneficial to discharge redundant water of light media. The sand bed had some protective effects on nutrient of light media which could slow down the nutrient erosion rate,and it was particularly pronounced for a long time from fertilization. The temperature of light media was lower than air temperature by 1-2 ℃. The temperatures of light media in sand bed were higher than those in pallets under three weather types and sand bed had a certain heat preservation effect.