施肥对退化草原植物群落产量及土壤理化性质的影响

研究了不同施肥处理对退化草原植物群落产量及理化性质的影响。结果表明:化肥与有机肥配施处理的干草产量增加最多,干草产量达4 500 kg/hm2,为不施肥的4.9倍。各处理增产效果依次为化肥与有机肥配施>化肥与石膏>化肥与沸石>化肥>不施肥;施肥后植被盖度增加,土壤容重降低,含水量增大,全量养分有所提高。说明施用有机肥和石膏或沸石等改土物质能明显增加牧草产量、改善土壤性质,对退化草原植被恢复具有明显效果。

Effects of fertilization on the plant community yield and soil properties of deteriorated grassland

The effects of fertilization on the plant community yield and soil physical and chemical properties of deteriorated grassland were studied.The results showed that the dry grass yield was greatly increased by application of chemical and organic fertilizer,and the sequence was as follows:chemical and organic fertilizer,chemical fertilizer and gypsum,chemical fertilizer and zeolite,chemical fertilizer,and CK.The vegetation coverage was increased by nearly 2 times.The soil bulk density was decreased by 8%.The soil water content was increased by 30%.The total soil nutrient contents were increased as well.It could be concluded that organic matter,gypsum,zeolite could increase the grass yield,improve the soil properties and deteriorated vegetation obviously.