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低分子有机酸在森林生态系统中普遍存在,在根际和多种成土过程中发挥重要作用,但有机酸发挥作用的能力和效率与其在土壤中的吸附与降解等行为关系密切。本文研究了草酸、柠檬酸和苹果酸等低分子有机酸在森林暗棕壤A1层和B层的吸附及生物降解行为,结果表明,低分子有机酸加入到暗棕壤后迅速被土壤固相颗粒所吸附,其中对草酸的吸附远强于柠檬酸和苹果酸,三种低分子有机酸在暗棕壤A1层的吸附率强于B层;草酸、柠檬酸和苹果酸加入到森林暗棕壤后还能迅速被微生物降解,其中对草酸的降解远低于柠檬酸和苹果酸,暗棕壤对草酸较强的吸附作用可能是其生物降解率较低的主要原因,且三种低分子有机酸在A1层暗棕壤中的生物降解率高于B层。
Low molecular weight organic acids are ubiquitous in forest ecosystems and play an important role in rhizosphere and multiple soil-forming processes. However, the ability and efficiency of organic acids to function are closely related to their adsorption and degradation in soil. In this paper, the adsorption and biodegradation behaviors of low molecular weight organic acids such as oxalic acid, citric acid and malic acid in the dark brown soil layers A1 and B were studied. The results showed that low molecular weight organic acids The adsorption of oxalic acid was stronger than that of citric acid and malic acid. The adsorption rates of the three low molecular weight organic acids in the dark brown soil layer A1 were stronger than those in the B layer. Oxalic acid, citric acid and malic acid were added to the forest dark brown After the soil can also be quickly biodegraded, which oxalic acid degradation is much lower than citric acid and malic acid, dark brown soil strongly adsorbed oxalic acid may be its main reason for the lower biodegradation rate, and three kinds of low molecular weight The biodegradation rate of organic acids in the dark brown soil layer A1 was higher than that in the B soil layer.