摘要
高速公路绿化带土壤多为生土 ,植物难以生长良好。污泥含植物养分及大量有机质 ,具有肥田及改土作用。将其与秸秆进行堆肥化处理后 ,加入化肥制成复合污泥堆肥 ,施用于高速公路 ,既避开了食物链 ,对环境也无影响。在西宝、西三及西临高速公路的中央分隔带、护坡及转盘对几种树和草类进行的试验 ,证明植物响应良好 :护坡及转盘内草坪草生物量增加 ,颜色加深 ,绿色期延长 ;护坡草生长旺盛 ,根系发达 ,对护坡具有良好作用 ;中央分隔带植物高度、冠幅、地径增大。在西宝线2km的示范段全面施用 ,植物明显生长良好 ,成为一个绿色长廊的样板。与化肥相比 ,复合污泥堆肥具有明显的后效。
This paper discusses the reason that plant growth was improved after complex sludge compost (CSC) applied on highway greenbelt. At firstly, in respect of the change in soil chemical and physical properties, all the index of CEC, available nitrogen and phosphorus, water content and organic matter were increased, but bulk density of the soil decreased. Secondly, in respect of plant nutrients, the contents of nitrogen, phosphorus in plant tissues were higher than that of control and increased with the amounts of CSC applied. Thirdly, the nitrate-nitrogen did not pollute the underground water as the result of its leaching only reaching 40-80cm depth. At finally, the heavy metal's bioavailability in calcarious soil of highway was very low, and there was no difference of heavy metals content in plants between CSC and control treatment. It showed that there was no accumulation of heavy metals in plant. Considering that the highway greenbelt is a close system and keeps away the human food chain, the result indicated that the application of CSC in highway greenbelt is safe.
出处
《农业环境保护》
CSCD
2000年第4期204-208,共5页
Agro-Environmental Protection
关键词
复合污泥堆肥
高速公路
绿化带
植物生长响应
complex sludge compost
highway greenbelt
plant nutrient
heavy metal bioavailability
