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

摘要/Abstract

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 337.5 kg/hm²)分别增加243.5%,234.0%,153.6%和127.0%,N2处理(两季共施N 675 kg/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。

Abstract: 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.

中图分类号:

李文西,鲁剑巍,鲁君明,李小坤. 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[J]. 草业学报, 2011, 20(1): 55-61.

LI Wen-xi, LU Jian-wei, LU Jun-ming, LI Xiao-kun. Effect of N application on yield of forage grass and the accumulation
of N and C under a sudangrass/ryegrass rotation[J]. Acta Prataculturae Sinica, 2011, 20(1): 55-61.

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