酸雨区杉木人工林土壤盐基离子含量动态

Dynamics of the soil base cations in Chinese fir plantations in acid rain region

以酸雨区杉木人工林土壤为研究对象,通过测定不同林龄杉木林土壤交换性盐基离子含量,探讨酸雨背景下不同林龄杉木人工林土壤盐基离子含量的动态规律。结果表明:杉木人工林土壤盐基离子含量与季节、林龄及土层深度各因子均呈极显著相关关系;同一林龄同一土层杉木人工林土壤交换性K+、Na+含量总体表现为夏秋季显著高于春冬季,Ca2+、Mg2+含量则呈春夏高于秋冬季(P<0.05);在四季中不同土层深度土壤交换性K+、Na+含量总体呈现1-5 a增加,5-15 a降低,15-20 a增加的规律;Ca2+、Mg2+含量则随林龄表现出1-10 a增加,10-20 a减少的趋势;随着土层深度的增加,不同林龄杉木人工林土壤盐基离子含量总体呈现出下降趋势。

The dynamics of soil base cations content in different-age Chinese fir plantations in acid rain region were analyzed to study the dynamic law of soil base cations under the background of acid rain. The results showed as follows. The soil base cations were closely related with seasons, forest ages, soil depth. In different seasons, the content of K＋and Na＋had significant differences in different seasons as those were higher in summer and autumn than in spring and winter （P〈0.05） at the same soil depth in the same forest age, while the content of Ca2＋and Mg2＋were higher in spring or summer than in autumn and winter. In the same season, the content of K＋ and Na＋ increased from 1 to 5 a, then decreased from 5 to 15 a and increased again from 15 to 20 a, and the content of Ca2＋ and Mg2＋showed the different trend that rose from 1 to 10 a, and declined from the 10 to 20 a at the same soil depth. With the increase of the soil depth, the content of soil base cations in different age Chinese fir plantations tended to decrease.