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以北固山湿地沉积物为研究对象,采用室内培养方法研究不同前期含水率(1%~3%、7%~11%和16%~18%,重量百分数)沉积物变湿后(60%)以及由湿变干过程(从70%变干至5%~7%)硝酸还原酶(Nar)活性的变化规律,以期为干湿交替水分生态过程N2O形成与排放的评估提供依据。结果表明,在变湿后的48h,前期含水率为16%~18%的沉积物Nar活性维持在一个较高水平,前期含水率为1%~3%的沉积物Nar活性最低,7%~11%的居中。前期含水率越高,沉积物变湿后的Nar活性也越高。由湿变干过程中,当含水量从19%~22%降至5%~7%时,沉积物Nar活性显著的高于含水量从70%降至19%~22%时的Nar活性。沉积物含水量在较低含水量区间的降低过程使其Nar活性增加。
Taking the Guzhushan wetland sediment in the north as the research object, indoor sediment was used to study the effects of different water content (60% ), And the activity of nitrate reductase (Nar) from wet to dry (from 70% to 5% ~ 7%), in order to provide a basis for the assessment of formation and emission of N2O during the wet-dry alternation ecological process. The results showed that the Nar activity of the sediments with the pre-moisture content of 16% -18% maintained at a relatively high level at 48h after the wetting, and Nar of the sediments with the pre-moisture content of 1% -3% 11% of the center. The higher the pre-moisture content, the higher the Nar activity after the sediment is wetted. When the water content decreased from 19% ~ 22% to 5% ~ 7%, the Nar activity of the sediment was significantly higher than that of the Nar activity when the water content decreased from 70% to 19% ~ 22% from wet to dry. Decrease of sediment water content in the lower water cut increases its Nar activity.