嫌气培养下砷酸盐和氮肥种类对土壤中微生物呼吸作用和反硝化作用的影响(英文)

在土壤生态系统中，砷污染和氮肥过量所引起的氮素污染越来越普遍．但至今仍很少了解砷污染对土壤中温室气体（Ｎ２Ｏ和ＣＯ２）产生和有关微生物过程的影响．本文通过土壤泥浆的嫌气培养试验，研究了添加砷酸盐和改变氮肥种类（氮素形态）对反硝化作用（Ｎ２Ｏ产生量）和呼吸过程（ＣＯ２产生量）的影响．试验结果表明，不同氮素形态对ＣＯ２产生量没有明显的影响．供应ＮＯ－３－Ｎ作为氮源时，无论是否添加砷酸盐，其Ｎ２Ｏ产生量没有明显的差异；但当供应ＮＨ＋４－Ｎ和尿素作为氮源时，其Ｎ２Ｏ产生量稍有增加．添加砷酸盐会使Ｎ２Ｏ量增加，但使ＣＯ２产生量降低．因此，砷污染可能会导致微生物呼吸作用和反硝化作用受到抑制．

Effects of Arsenate and Nitrogen Fertilizers on Soil CO 2 and N 2O Emissions Under Anaerobic Incubation

Although arsenic pollution and nitrate pollution are reported to co exist in soil, little research has been conducted to understand the relation of arsenate to trace gas, e.g., N 2O and CO 2, emissions and microbial processes in soil. This study was designed to investigate the effect of arsenate and the type of N fertilizers on soil denitrification (N 2O emission) and respiration (CO 2 emission). It was found that CO 2 emission was not affected by the type of N fertilizers, but greatly reduced by the added arsenate when NO - 3 N, NH 4 N or urea was provided. The inhibition effect was even much more significant when NO - 3 N was supplied. It is, therefore, concluded that arsenic pollution inhibited denitrification and respiration processes in the soil.