产量和生物量降低
The yield and biomass have decreased
以上为机器翻译结果，长、整句建议使用 人工翻译 。
实验证明随坡度和水土流失量的增大，作物产量、生物量降低，平均降低幅度为8.7%和22.8%。
Experiments proved that crop yield and biomass reduced 8.7% and 22.8% by average as increasing of slope gradient and soil and water losses amount.
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