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本试验以采自中国东北3个地点的4种土壤,即棕色针叶林土、暗棕壤、黑土与黑钙土为材料,对根系分泌的两种有机酸及水在活化根际矿质养分方面的作用进行了模拟与比较。结果表明:有机酸能够活化养分,其程度主要取决于有机酸的数量和类型以及供试土壤的理化和生物化学性质;对于所有土壤类型,柠檬酸对Fe, Mn, Cu和Zn的活化效率明显高于苹果酸,而对于P, K, Ca 和Mg的活化效率并不是很高,有时甚至较苹果酸为低;所有元素的溶液浓度均随所加柠檬酸数量的增加而增加。图2表3参9。
In this study, four kinds of soil collected from three locations in northeastern China, namely brown coniferous forest soil, dark brown soil, black soil and chernozem soil, were used to study the effects of two kinds of organic acids and water secreted by roots on the activation of rhizosphere mineral nutrients The role of the simulation and comparison. The results showed that organic acids can activate nutrients, the degree of which depends on the amount and type of organic acids and the physicochemical and biochemical properties of the soil tested. The activation efficiency of Fe, Mn, Cu and Zn by citric acid is obvious for all soil types Is higher than that of malic acid, while the activation efficiencies for P, K, Ca and Mg are not very high, sometimes even lower than that of malic acid; the concentration of all the elements increases with the amount of citric acid added. Figure 2 Table 3 参 9.