摘要
为揭示不同pH值对好氧堆肥中NH_(3)挥发和氮素化合物转化的影响,设置5个处理(T1:对照;T2~T4:pH值分别为8.5、7.5和6.5;T5:酸性添加剂,10%过磷酸钙),研究不同pH值和酸性添加剂对好氧堆肥中NH_(3)挥发和氮素化合物转化的影响。试验结果表明,堆肥的高温期氨挥发量占总挥发量的95%以上。降低堆体pH值可以有效降低氨挥发,且初始pH值越低,氨挥发量越少。至堆肥结束,与T1处理相比,T2~T4处理的NH_(3)累计排放量分别减少了35.8%、66.93%和84.48%。添加过磷酸钙能使堆体pH值降低0.03~0.09个单位,使氨挥发减少62.42%。至堆肥结束,T1、T2、T3和T5处理NH_(4)^(+)-N含量均下降到0.04 g·kg^(-1)以下的水平,而T4处理NH_(4)^(+)-N含量最大为0.17 g·kg^(-1)。说明T4处理有利于促进反硝化作用的进行。T3处理的NO_(3)^(-)-N和酸解有机氮含量均高于T1、T2和T4处理。说明T3处理有利于促进硝化作用和氨同化作用的进行。与T1处理相比,T5处理NH_(4)^(+)-N含量增加了8.56%,NO_(3)^(-)-N含量减少了30%,酸解有机氮含量增加了2.52%,这说明,过磷酸钙的添加有利于促进氨同化作用的进行,但是抑制了反硝化作用的进行。
To reveal the effects of different pH values on NH_(3) volatilization and nitrogen compound transformation in aerobic compost,five treatments were set (T1:control;T2-T4:pH values) were 8.5,7.5,and 6.5;T5:acid additive,10%The effects of different pH values and acidic additives on NH_(3) volatilization and nitrogen compound conversion in aerobic composting were studied.The test results show that ammonia volatilization in the high temperature period of compost accounts for more than 95% of the total volatilization.Lowering the pH value of the stack can effectively reduce ammonia volatilization,and the lower the initial pH value,the less ammonia volatilization.By the end of composting,compared with the T1 treatment,the cumulative NH_(3)emissions of the T2-T4 treatments were reduced by 35.8%,66.93%and 84.48%,respectively.Adding superphosphate can reduce the pH value of the pile by 0.03-0.09 units,and reduce the volatilization of ammonia by 62.42%.By the end of composting,the content of NH^(+)_(4)-N in T1,T2,T3 and T5 treatments all decreased to the level below 0.04 g·kg^(-1),while the content of NH^(+)_(4)-N in T4treatment was the highest at 0.17 g·kg^(-1).It shows that T4 treatment is beneficial to promote denitrification.The contents of NO^(-)_(3)-N and acid-hydrolyzed organic nitrogen in T3 treatment were higher than those in T1,T2 and T4 treatments.It shows that T3 treatment is beneficial to promote nitrification and ammonia assimilation.Compared with T1 treatment,the content of NH^(+)_(4)-N in T5 treatment increased by 8.56%,the content of NO^(-)_(3)-N decreased by 30%,and the content of acid-hydrolyzed organic nitrogen increased by 2.52%.Assimilation proceeds,but denitrification is inhibited.
作者
苏杨琴
邱慧珍
成志远
李云
Su Yangqin;Qiu Huizhen;Cheng Zhiyuan;Li Yun(College of Resources and Environment Science,Lanzhou 730070,China;Gansu Agricultural University,Key Lab of Arid Land Crop Science,Lanzhou 730070,China;Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou 730070,China)
出处
《国土与自然资源研究》
2024年第1期57-62,共6页
Territory & Natural Resources Study
关键词
PH值
酸性添加剂
好氧堆肥
NH3挥发
氮素转化
pH value
acid additive
aerobic composting
NH,volatilization
nitrogen transformation
