不同释放期包膜尿素施用对退化荒漠草原植被的影响

对内蒙古苏尼特右旗荒漠草原退化草地施用释放期为30、60d的包膜尿素,施肥(纯氮)水平分别为0,0.4375,0.875,1.75kg/100m2。结果表明:2种控释肥料对退化草地的盖度、密度的影响在不同施肥水平间均没有显著差异(P0.05);对地上生物量的影响,2种控释肥料的效果随施肥水平的不同,变化趋势一致;0.875kg/100m2的S60处理下,地上生物量达到54.3g/m2,与不施肥处理间差异显著(P0.05)。综合各施肥水平,S30处理下的植被盖度平均值为8.2%,S60处理下的植被盖度均值为6%,显著差异(P0.05);密度分别为34.0,43.9株/m2、地上生物量分别为46.4,57.3g/m2,没有显著差异(P0.05)。

Effect of coated urea application on vegetation of degraded desert steppe

The effect of slow-release fertilizer on the degraded desert steppe was studied with 30 days and 60 days slow-release urea in Sonid Baran Hoshuu in Inner Mongolia.The fertilization levels were 0,0.437 5,0.875, 1.75 kg/100 m2 ,respectively.The results showed that no significant differences among different fertilization levels were observed for the coverage and density in the same treat.For the aboveground biomass,the effect of two fertilizers was similar at different fertilization level.S60 significantly affected the aboveground biomass (P <0.05)and the highest (54.3 g/m2 )occurred at 0.875 kg N per 100 m2 .Under S30 and S60 treatments,the average coverage was 8.2% and 6% respectively and the difference was significant (P <0.05).But no difference for the average density (34.0 and 43.9 plant/m2 respectively ) was found.However,the difference of aboveground biomass (46.4 and 57.3 g/m2 respectively)was significant.