求翻译：因此，根据湖南降雨季节分布规律，加高加固田埂，早稻成熟期可蓄积20 cm深水，有利于双季稻区晚稻种植。但蓄深水增加了CH4排放，有待进一步深入研究减排措施。是什么意思？

Thus, according to the distribution of seasonal rainfall in Hunan , heightening reinforcement ridge , rice maturity can accumulate 20 cm deep water , is conducive to double cropping rice planting.

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Therefore, according to the Hunan rainfall season distribution rule, raises the reinforcement boundary ridge between fields, the early rice mature period may store up 20 cm deep water, is advantageous in the double-crop rice area late ripening rile planter.But gathered the deep water to increase the

Thus, according to Hunan, rainfall distribution, heightening the Ridge, early maturation can stand 20 cm deep water, conducive to planting of late rice in double cropping Rice region. Storage increased CH4 emissions in deep water, should be studied further emission reduction measures.

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