soil improvement amelioration
土壤改良改良
以上为机器翻译结果,长、整句建议使用 人工翻译 。
It shows that the yield improvement is mainly due to the soil nutrient amelioration (especially nitrogen nutrient) and the interaction of mutual supplement of N and P nutrient.
指出杨树刺槐混交林生产力提高主要是因为林地土壤养分(特别是N素养分)的极大改善及树种间N、P养分的互补。
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