施氮量对沙地羊草叶片非结构碳氮的影响

Effect of nitrogen application on unstructured carbonand nitrogen in leaf of Leymus chinensisin sandy land

摘要:

在人工建植的沙地羊草草地设不同水平N 肥(0、100、200、300、400 kg/hm2)处理,分别用N0、N1、N2、N3、N4表示,研究不同N 肥水平对沙地羊草叶片非结构碳氮的影响。结果表明:施氮可增加羊草叶片可溶性糖含量;随氮肥施入水平的增加,沙地羊草上部叶片的淀粉含量呈降低的变化趋势,第2茬沙地羊草下部叶片的淀粉含量呈先增加后降低的趋势;施N 可显著增加沙地羊草叶片的可溶性蛋白含量(P <0.05),亦可增加第1茬羊草叶片的游离氨基酸含量;沙地羊草叶片C/N 均随施氮的增加呈先降低后增加的变化趋势,上部叶片在N1水平下的C/N 最小,试验得出N1(100 kg/hm2)水平为该地区最佳施氮量。

Abstract:

Different levels of N fertilizer were applied to the sown Leymus chinensis pasture (0,N0;100,N1;200,N2;300,N3 and 400 kg/ha,N4) to study the effect of nitrogen application on unstructured carbon and nitrogenin leaf of Leymus chinensis in sandy land.The result showed that the nitrogen application increased thesoluble sugar content.With the increase of nitrogen application level,the starch content in the upper leaf decreased,and it increased first and then decreased in the lower leaf in the second cut.Nitrogen application significantlyincreased the content of soluble protein (P <0.05),and the content of free amino acids in the first cut.The leaf C/N showed a trend of decreasing first and then increasing with the increase of nitrogen applicationlevel.The leaf C/N was the lowest under N1 treatment in upper leaf.It could be concluded that N1 treatmentwas the best.