nitrogen budget change 氮平衡变化
apparent nitrogen budget 土壤氮素表观盈亏
carbon and nitrogen budget 碳氮收支
nitrogen budget of cotton field 棉田氮素平衡
Nitrogen and Energy Budget 氮收支和能量收支
nitrogen and carbon budget 氮与碳收支
nitrogen and phosphorus budget 氮磷收支
nitrogen and oxygen isotope budget 氮氧稳定同位素负荷
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