酸雨区不同林龄杉木人工林土壤活性铝含量季节动态

Seasonal variations of the soil active aluminum content in different-aged Cunninghamia lanceolata plantation in acid rain area

分析了酸雨区不同林龄(1、5、10、15 a)杉木人工林土壤活性铝含量的季节动态.结果表明:同一季节同一土层深度不同林龄杉木人工林土壤交换态铝含量表现为15 a>10 a>5 a>1 a,1 a与5 a差异不显著;同一林龄同一土层深度不同季节杉木人工林土壤交换态铝含量总体表现为冬季>春季>夏、秋季,夏、秋季间无明显变化.杉木人工林土壤吸附态羟基铝含量随林龄及季节的变化规律与交换态铝相似.同一土层深度同一林龄不同季节杉木工人林土壤有机络合态铝含量总体表现为春季>冬季>秋季>夏季,同一季节同一土层深度不同林龄杉木人工林土壤有机络合态铝含量随林龄的增加而提高.酸雨区不同林龄杉木人工林表层土壤活性铝含量高于中下层土壤,活性铝占总铝的比例随林龄的增加而增大.

The seasonal variation of the soil active aluminum content in different-aged （1 a, 5 a, 10 a, 15 a） Cunninghamia lan- ceolata plantations in acid rain area was researched. The result was as follows, in the same season, the soil exchangeable aluminum content at the same soil depth in different-aged C./anceo/ata plantations showed following trend： 15 a 〉 10 a 〉5 a 〉 1 a, with non- significant difference between 1 a and 5 a; in different seasons, the soil exchangeable aluminum content at the same soil depth in the same-aged C. lanceolata plantation generally showed following trend： winter 〉 spring 〉 summer or autumn, with non-signlficant difference between summer and autumn. The variation of the content of the soil hydroxy-aluminum of adsorbed state in different-aged C./anceo/ata plantations was similar with that of exchangeable aluminum. In different seasons, the content of soil aluminum of or- ganic complexing state at the same soil depth in the same-aged C. hmceo/ata plantation generally showed following trend： spring 〉 winter 〉 autumn 〉 summer; in the same season, the content of soil aluminum of organic complexing state at the same soil depth in different-aged C. lanceolata plantations showed following trend： 15 a 〉 10 a 〉5 a 〉 1 a. In different-aged C./anceo/ata plantations in acid rain area, the content of soil active aluminum in the surface soil was higher than that in the middle and lower soil and the ratio of active aluminum mass to total aluminum mass increased with the increase of plantation age.