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风干处理常对土壤中的硝化细菌数量和活性造成显著影响.为研究土壤硝化作用的干土效应,以分别发育于第四纪红土(quaternary red earth,Q)和红砂岩(tertiary red sandstone,S),利用方式为水稻(rice,R)与旱地(upland,U)的4个农田土壤的新鲜土与风干土为供试材料,进行35d的室内培养试验.结果表明,对于无外源铵输入的处理而言,旱地土壤QU的新鲜土和风干土的硝化率分别为48%和54%,SU则分别为76%和78%,硝化作用的干土效应均不显著(p>0.05);但干土效应却显著影响了水稻土的硝化作用(QR的新鲜土和风干土的硝化率分别为40%和89%,SR分别为76%和94%,p<0.01),且其风干土样的硝化作用表现出明显的微生物激活过程.外源铵的加入促进了土壤的硝化作用强度且使得旱地土壤的干土效应显著,所有供试土壤新鲜土的硝化率均显著高于风干土的硝化率.总之,土壤利用方式显著影响了硝化作用对干土效应的响应,而且利用方式和加铵对硝化作用的干土效应有着极显著的交互作用.
Drying often affected the quantity and activity of nitrifying bacteria in the soil.In order to study the effects of soil nitrification on dry soil, the soil dry-soil effect was developed in Quaternary red earth (Q) and tertiary red sandstone (S ), And the soil samples were taken from fresh soil and dry soil of four farmland soils of rice (R) and upland (U) for 35 days.The results showed that for the non-exogenous ammonium input , The nitrification rates of fresh soil and dry soil of QU in dryland soil were 48% and 54% respectively, while those in SU were 76% and 78% respectively. The dry soil effect of nitrification was not significant (p> 0.05). However, the dry soil effect significantly affected the nitrification of paddy soils (the nitrification rates of fresh and dried soil of QR were 40% and 89%, respectively, SR were 76% and 94%, respectively, p <0.01) Like nitrification showed obvious process of microbial activation.The addition of exogenous ammonium promoted the intensity of soil nitrification and made the dry soil effect of dry land significantly, and the nitrification rate of fresh soil of all tested soil was significantly higher than that of dry soil Nitrification rate.In summary, the soil utilization mode significantly affected the nitrification on dry soil The response should be, and use patterns and processing effects on dry soil ammonium nitrification has a very significant interaction.