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采用室内模拟试验研究了采自苏南丘陵的两种森林土壤磷的固定特性。结果表明 :苏南丘陵森林土壤磷的固定作用强 ,磷的固定量大。林木根系生长能在一定程度上降低土壤磷的固定作用 ,因此土壤磷的固定量和固定率从小到大依次为根际土、根区土、非根区土。有机酸对土壤磷的固定有较大影响 ,其影响作用从大到小依次为腐殖酸、柠檬酸、酒石酸。腐殖酸加入量为 2 0g·kg-1、柠檬酸和酒石酸的加入量均为 4 0g·kg-1时 ,对土壤磷的固定具有较强抑制作用 ;但有机酸用量过多时 ,对磷素固定的抑制作用反而减弱。因此 ,在森林土壤上使用磷肥时 ,应与适量的有机酸混合施用 ,以减少土壤磷的固定 ,提高肥效
Indoor simulation experiments were conducted to study the fixation characteristics of phosphorus in two forest soils from the southern Jiangsu hills. The results showed that phosphorus fixation in the soil in the southern Jiangsu hilly forest was strong, and the amount of phosphorus fixation was large. The root growth of forest trees can reduce the fixation effect of soil phosphorus to a certain extent. Therefore, the fixed amount and fixed rate of soil phosphorus are rhizosphere soil, root soil and non-root soil in descending order. Organic acids have a greater impact on the fixation of soil phosphorus, and their effect from descending order of humic acid, citric acid, tartaric acid. When the amount of humic acid added was 20 g · kg-1, citric acid and tartaric acid were all added in the amount of 40 g · kg-1, the immobilization of soil phosphorus had a strong inhibitory effect. However, when the amount of organic acids was too much, Inhibition of the hormone fixed but weakened. Therefore, the use of phosphate fertilizer in forest soils should be mixed with the appropriate amount of organic acids to reduce the fixation of soil phosphorus and improve fertilizer efficiency