黄河故道沙荒草地生物量及营养价值特性研究

SIUDY ON SANDY WASTB GRASSLAND BIOMASS AND ITS NUTRITlVE VALUE CHARACTERISTICS IN THE OLD COURSE OF THE YELLOW RlVER

对黄河故道沙荒草地生物量季节变化规律以及牧草营养物质产出动态进行了分析，结果表明：（１）沙荒草地牧草生物量的增长呈二次曲线变化规律：ｙ＝１／（３．７９×１０（－７）ｔ２－９．３２×１０（－５）ｔ＋７．８３×１０（－３）），并且其生物量在９月份达到最大值；（２）从５月份开始沙荒草地牧草营养价值逐渐降低，且于物质消化率（ＤＭＤ）与其粗蛋白质（ＣＰ）、木质素（ＬＩＧ）含量分别表现为显著正相关（ｒ＝０．９４＊）和显著负相关（ｒ＝－０．９７＊）关系；（３）沙荒草地放牧利用的最佳时期为５～９月份，而９月份为最好的刈割晒制干草时期。

In this paper,the seasonal changing regularity of sandy waste grassland biomass and the dynamic varia-tion of nutritive components for its forage grass Were analysed in the old course of the Yellow River. The re-sults showed that:(1) The variative regtilarity on quadratic curve occurred for the forage grass biomass inthe sandy Waste grassland, the equation was biomass reached the highest value in September every year.(2) The nutritive value of forage grass wasgradually decreased in the sandy waste grassland at the beginning of May,the Significant Positive Cor-relation(r= 0. 94)is noted between its dry matter disappearance(DMD) and its crude protein(CP) con-tent,the significant negative correlation(r=-0.97) was also observed between its DMD value and itsLignin(LIG) Content.(3)The best period of pasturage was from May to September in sandy waste grass-land and the best period of mowing and prepardring forage grass was Deptember.