抑制剂NAM对盐渍土壤酶活性、微生物量和蔬菜品质的影响

Effect of Inhibitor NAM on Enzyme Activities,Microbial Biomass and Vegetable Quality in Saline Soil

为了提高盐渍土壤中作物的肥料利用率,通过盆栽试验,研究了NAM添加剂对盐渍土壤酶活性、微生物量和蔬菜生长的影响。结果表明,与常规施肥比较,在同等氮水平下添加NAM土壤呼吸强度增加了86.39%~103.00%,脲酶活性减少了53.41%~54.01%,脱氢酶增加了10.00%~11.11%,磷酸酶增加了54.43%~60.00%,蔗糖酶增加了9.84%~43.19%。微生物量碳、氮、磷分别增加了49.15%~62.26%,74.72%~96.78%,64.10%~94.34%,代谢熵增加了16.67%~20.00%。试验还表明,NAM添加剂对小白菜叶宽和根长增加44.28%和62.98%,对小青菜增加47.90%和77.07%,株重分别增加了84.23%和144.73%。维生素C分别增加了75.86%和13.64%;叶绿素总量分别增加了111.83%和71.33%,而丙二醛变化不显著。在减氮20%添加NAM处理的情况下,蔬菜各项生长指标与常规施肥处理几乎相当。可见,盐渍土壤中减氮添加NAM可以达到与常规施肥量同样的效果,这对于减少肥料使用,保护生态环境有一定的现实意义。

In order to improve the utilization rate of fertilizer in the saline soil,the effects of NAM additive on enzyme activity,microbial biomass and vegetable growth in saline soil were studied by pot experiment.The results showed that,compared with conventional fertilization,adding NAM soil respiration under the same nitrogen level increased 86.39%-103.00%,urease activity decreased 53.41%-54.01%,increased 10.00%-11.11%dehydrogenase,phosphatase and invertase increased 54.43%-60.00%,increased by 9.84%-43.19%.Microbial biomass C,N and P were increased by 49.15%-62.26%,74.72%-96.78%,64.10%-94.34%,and metabolic quotient increased by 16.67%-20.00%.The results also showed that the NAM additive increased the leaf width and root length by 44.28%and 62.98%,and increased the plant weight by a factor of 47.90%and 77.07%,respectively,and increased by 84.23%and 144.73%,respectively.Vitamin C increased by 75.86%and 13.64%,respectively.The total chlorophyll content increased by 111.83%and 71.33%respectively,while MDA content was not significant.Under the condition of reducing nitrogen 20%by adding NAM,the growth indexes of vegetables were almost equal to that of conventional fertilization.It can be seen that the addition of NAM in saline soil can achieve the same effect as that of conventional fertilization,which has a certain practical significance to reduce the use of fertilizers and protect the ecological environment.