土壤有效氮磷
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Available nitrogen and phosphorus in soil
以上为机器翻译结果，长、整句建议使用 人工翻译 。
对毛竹土壤有机碳密度影响最大的为有机碳含量，对土壤有机碳密度的影响次之的为土壤全氮量，土壤有效磷量对其影响程度也较大。
The biggest influence to soil organic carbon density was organic carbon content, the next was total nitrogen, and content of soil available phosphorus was also influenced soil organic carbon density.
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