摘要
本文研究了四川盆地9种紫色水稻土有机无机复合体中铁、铝氧化物的组成。结果表明,游离铁为钙质紫色水稻土>中性紫色水稻土>酸性紫色水稻土,无定形铁为中性紫色水稻土>酸性紫色水稻土>钙质紫色水稻土,游离铁活化度为酸性紫色水稻土>中性紫色水稻土>钙质紫色水稻土,络合态铁以中性紫色水稻土较高,络合态铝以酸性紫色水稻土最高,酸性紫色水稻土无定形铝比中性和钙质紫色水稻土高5～30倍。在中性紫色水稻土中,<0.002mm粒级有机无机复合体游离铁、无定形铁和铝分别为土壤的32.8～58.3％、68.3～91.8％和66.7～93.0％;络合态铁、铝集中分布在<0.002mm和0.01～0.002mm有机无机复合体中,有机肥施用对无定形铁和络合态铁、铝具有明显的影响。有机质与无定形铁、铝和络合态铁、铝的相关系数分别为0.9473、0.4950、0.9412和-0.8322。络合态铁和铝间具有明显的拮抗作用(r=-0.7998)。在水旱轮作下,施用有机肥有利于紫色水稻土铁—腐殖质复合的形成。
This paper is concerned with the composition of Fe and Al oxides in the organic-mineral complexes of purple paddy ils (3 subgroups, 9 species, 24 layers and 7 treatments determined in a long-term organic manure applying experiment). The results are summarized as follows: 1. Free Fe oxide level in the soils appears in the sequence of calcareous >neutral>acid; amorphous Fe oxide—neutral>acid>calcareous; degree of activation of free Fc oxide—acid>neutral>calcareous. Complexed Fe oxide is higher in neutral soils and complexed Al oxide is highest in acid soils. The content of amorphous Al oxide in acid soils is 5～30 times higher than in the neutral or calcareous soils. 2. The quantities of free Fe oxide, amorphous Fe oxide and amorphous Al oxide of<0.02mm organo-mineral complexes in the neutral soils are 32.8～58.3, 68.3～91.8 and 66.7～93.0%, respectively, of the soil. Complexed Fe and Al oxides accumulate in <0.002mm and 0.01～0.002mm organo-mineral complexes. 3. Organic manure has significant effects on amorphous Fe and Al oxides and complcxed Fe and Al oxides in neutral soils. The correlation coefficients of organic matter with amorphous Fe and Al oxides and with complcxcd Fe and Al oxides arc 0.9433, 0.4950, 0.9412 and -0.8322, respectively, and there is an antagonistic effect between complexed Fc oxide and complcxcd Al oxide (r=-0.7998). Organic manure application favours the formation of Fe-humus complexes in purple paddy soils under water-dry rotation.
出处
《西南农业大学学报（自然科学版）》
CSCD
1991年第5期518-526,共9页
Journal of Southwest Agricultural University
基金
高等学校博士学科专项科研基金
