critical value of nutrient 中文意思是什麼
critical value of nutrient
解釋
養分臨界值-
Fourthly, critical value of erosive modulus, which may cause soil carbon and nutrient changing, has been taken. the results of simulation showed that different soil nutrient element ( c, n, p, k ) have different soil acceptable erosive modulus in different land use types. for example, in this study, the critical value for nitrogen is located in the range of 1500 - 2000t / km2for forest land, 2000 - 2500 t / km2 for tillage land, 2500 - 3000 t / km2 for garden land, and 1000 - 1500 t / km2
四、得到了引起土壤碳和養分發生變化的侵性模數閥值:通過對地塊土壤侵蝕模數、碳和養分含量變化的計算,得到了不同利用類型中不同元素含量出現下降的最低侵蝕模數閥值,如耕地全氮為2000一2500噸,果園全氮為3000一3500噸,林地全氮為1000一1500噸,草地全氮為1000 - 1500噸,從而為流域侵蝕治理規劃和生態環境建設提供了科學依據。
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