苏丹草-黑麦草轮作制中施氮量对饲草产量与土壤氮碳积累的影响  

Effect of N application on yield of forage grass and the accumulation of N and C under a sudangrass/ryegrass rotation

作　　者：李文西[1] 鲁剑巍[1] 鲁君明 李小坤[1] 

机构地区：[1]华中农业大学资源与环境学院,湖北武汉430070 [2]湖北省荆州市大同湖管理区农技中心,湖北荆州434300

出　　处：《草业学报》2011年第1期55-61,共7页Acta Prataculturae Sinica

基　　金：国际植物营养研究所(IPNI)国际合作项目(Hubei-22)资助

摘　　要：利用4年苏丹草与黑麦草轮作种植定位试验研究氮肥用量对饲草产量、饲草氮碳积累及土壤全氮、有机碳的影响。结果表明,随着氮肥用量的增加,4个年度的饲草总产量也随之增加,与N0处理(不施氮肥)相比,N1处理(两季共施N 337.5kg/hm2)分别增加243.5%,234.0%,153.6%和127.0%,N2处理(两季共施N 675kg/hm2)分别增加313.1%,339.9%,231.7%和222.8%。增施氮肥可以促进饲草的N、C积累,N1、N2处理的总N、C积累分别比N0处理增加134.7%,261.9%与110.2%,181.5%。轮作体系下,随着苏丹草、黑麦草不断种植,N1、N2处理的土壤全氮均上升,且显著正相关,而N0处理基本稳定;N0、N1、N2处理的土壤有机碳均上升,且显著正相关;与种植前相比,N1、N2处理的土壤C/N变化不大,而N0处理的土壤C/N明显上升。Sudangrass and ryegrass rotation is a new type of cropping system in Jianghan Plain,which has developed very fast in recent years.Effects of N application on yield and accumulation of N and C in forage grass and of total N and organic C in soil under a sudangrass/ryegrass rotation regime were studied for four years in a field experiment in Jianghan Plain.With increasing N application rate,total yield of forage grass increased in the seasons 2005-2006,2006-2007,2007-2008,and 2008-2009.Compared with N0（no N application） treatment,the yield in N1（total 337.5 kg N/ha in the rotation） treatment increased 243.5%,234.0%,153.6%,and 127.0% in the four successive seasons while yield in N2（total 675 kg N/ha in the rotation） treatment increased by 313.1%,339.9%,231.7% and 222.8%.Increasing N application improved the accumulation of N and C for the rotation.Total accumulations of N and C in N1 and N2 treatments were 134.7%,261.9% and 110.2%,181.5% higher than that of the N0 treatment.With the growth of the sudangrass/ryegrass rotation,soil total N in the N1 and N2 treatments increased but this was slight in the N0 treatment.Soil organic C in N0,N1,and N2 treatments all increased,and were significantly correlated with the treatment.Compared with the original soil,soil C/N ratios in the N1 and N2 treatments changed only slightly while that in the N0 treatment increased significantly.

关 键 词：苏丹草-黑麦草轮作 施氮量 产量 碳氮积累 

分 类 号：S54[农业科学—作物学]