应用人力资本法(HCA)评估了华北典型高产粮区地下水资源硝酸盐污染的价值损失。
The human capital approach (HCA) was applied to valuate the loses of groundwater source pollution by nitrate in the typical high-yielding farming region North China.
通过连续8年长期定位试验，研究了不同施肥方式对燕山山麓平原高产粮区褐土土壤肥力和作物产量的影响。
A 8 years long term experiment was conducted on the high yield area of plain at the foot of Yanshan mountain.
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