【作者】 吴飞龙； 叶美锋； 林代炎； 翁伯琦；

【Author】 WU Fei-long 1 ,YE Mei-feng 1 ,LIN Dai-yan 1 ,WENG Bo-qi 2 (1. Institute of Agricultural Engineering,Fujian Academy of Agricultural Science,Fuzhou 350003,China; 2. Fujian Academy of Agricultural Science,Fuzhou 350003,China)

【机构】 福建省农业科学院农业工程技术研究所； 福建省农业科学院；

【摘要】 本研究设置了不同沼液施用量0kg·m-2、40kg·m-2、60kg·m-2、80kg·m-2和100kg·m-2的处理,研究了象草的生物量、养分吸收利用效率以及土壤养分含量的变化。试验结果表明,适量施用沼液,促进象草分蘖,增加生物量。象草的氮利用效率在施用沼液60kg·m-2的处理上最高,为27.5%,而之后随着沼液施用量的增加,氮利用效率逐渐降低,而磷的利用效率在施用沼液40kg·m-2的处理上最高,为14.3%,而之后随着沼液施用量的增加,磷利用效率变化不大,维持在13%。施用沼液的处理0～30cm土层土壤全氮养分出现累积,而30～60cm土层土壤的全氮养分出现亏缺,但是施用沼液对不同土层土壤的碱解氮、全磷和速效磷没有影响。然而,种植象草之后土壤中的全磷和速效磷含量分别比种植象草之前降低了83%～90%和96%～98%。更多还原

【Abstract】 In this study,we set up a experiment with different application amount of biogas slurry,0 kg·m -2 、40 kg·m -2 、60 kg·m -2 、80 kg·m -2 and 100 kg·m -2 ,to study the change of biomass,nutrient use efficiency of Pennisetum purpureum and soil nutrient content. The results showed that:Pennisetum purpureum could grow well with appropriate application amount of biogas slurry. The highest nitrogen use efficiency of Pennisetum purpureum,27.5%,was reached at 60 kg·m -2 application amount of biogas slurry. And the nitrogen use efficiency of Pennisetum purpureum declined with an increase in the application amount of biogas slurry within 60～100 kg·m -2. The highest of phosphorus use efficiency,14.3%,was reached at 40 kg·m -2 application amount of biogas slurry and the other treatments of biogas slurry maintained 13%. Soil TN of 0～30 cm layer was accumulation with the application of biogas slurry,and Soil TN of 30～60 cm layer was deficiency with the application of biogas slurry. But there were no significant difference between the application of biogas slurry and no application on the soil alkali-N,TP and available P of different layer. However,the soil TP and available P reduced by 83%～90% and 96%～98% after Pennisetum purpureum growing contrast to before Pennisetum purpureum growing.更多还原