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首页> 外文期刊>Plant and Soil >Effect of green manure and floodwater algae on diurnal fluctuations of floodwater pH and depth of aerobic soil layer under lowland rice conditions.
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Effect of green manure and floodwater algae on diurnal fluctuations of floodwater pH and depth of aerobic soil layer under lowland rice conditions.

机译：旱地条件下绿肥和洪水藻对洪水pH日变化和好氧土壤层深度的影响。

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摘要

In a study in an environmental chamber, a 5 cm layer of sandy loam soil covered with 5 cm deep floodwater was created in cylindrical plastic bottles 7 cm in diameter to simulate submerged rice conditions. The presence of algae in the floodwater increased the floodwater pH owing to removal of CO2 during photosynthesis during the day, the value decreasing again during the night. Addition of Cajanus cajan green manure, without algal growth, depressed the pH for the first week and after 4 weeks of incubation. With algae, the application of green manure in vitro resulted in lower diurnal pH increases, especially for the first 2 weeks of incubation and a consistently higher morning pH throughout the study. The addition of green manure eliminated the aerobic soil layer below the soil-water interface; it was concluded that this was because green manure causes a high O2 demand owing to increased microbial activity which results in a lower Eh value.
机译：在环境室中进行的一项研究中，在直径7厘米的圆柱形塑料瓶中创建了5厘米厚的沙壤土，覆盖了5厘米深的洪水，以模拟淹没的大米状况。洪水中藻类的存在由于白天光合作用中的CO2去除而使洪水pH值升高，而夜间则再次降低。在没有藻类生长的情况下，添加了Cajanus cajan绿肥，在培养的第一周和4周后降低了pH值。对于藻类，体外施用绿肥导致昼夜pH值降低，尤其是在培养的前两周，并且整个研究过程中早晨pH值始终较高。绿肥的加入消除了土壤-水界面下的好氧土壤层。结论是，这是因为绿肥由于微生物活性增加而导致较高的O2需求，从而导致较低的Eh值。

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