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1)  Soil background
土壤背景
2)  background soil
背景土壤
3)  soil background value
土壤背景值
1.
This paper discusnes the soil background values at Yangzhong County where the cancers mortality rate is high in China, and then compares the values with that of Jiangsu Province and China, By the methods of comprehensive efficiency ratio tcorre.
本文对我国癌症高发区扬中县土壤环境背景值作了论述,并与同期调查的全国和江苏省土壤背景值进行对比,采用多元素综合效应比值、相关、多元回归分析法,探讨了癌症发病率与土壤微量元素间的关系。
4)  indigenous N supply of soil
土壤背景氮
1.
N-fertilizer application in wheat significantly increased total N, ammonium-N and nitrate-N contents in paddy field, resulting in high indigenous N supply of soil (INS).
结果表明,麦季氮肥的施用明显提高了稻季土壤全氮、铵态氮和硝态氮的含量,造成土壤背景氮偏高。
5)  geological setting content of soil
土壤背景含量
6)  background value of soil erosion
土壤侵蚀背景值
1.
Then it defines that thebackground value of soil erosion of the middle Yellow River is 650-1000 millon tons/year according to thetwo-way calculation results of aggradation volume of the river alluvial fan and sediment deposition volumeof the ancient river mouth, after comprehensive consideration and under the conditions of less.
根据研究,首先确定先秦至西汉时期为推估黄河中游土壤侵蚀背景值的年代。
补充资料:土壤环境背景值(background value of soil environment)
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性质:又称土壤环境背景值(background value of soil environment)。在土壤未受污染与破坏的情况下,土壤中基本化学元素的正常含量。实际上,只是在土壤相对未受污染的情况下,土壤的基本化学组成。

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