秦岭北麓华北落叶松林地土壤有效性钾含量变化  

Seasonal Dynamics in Soil Content of Effective Potassium for Different Ages of Larix principis-rupprechtii in the Northern Foot of the Qinling Mountains

作　　者：陈钦程 徐福利[2] 王渭玲[1] 林云[1] 

机构地区：[1]西北农林科技大学,杨凌712100 [2]中国科学院水利部水土保持研究所,杨凌712100

出　　处：《植物学报》2015年第4期482-489,共8页Chinese Bulletin of Botany

基　　金：十二五国家重点基础研究发展计划(No.2012CB416902)

摘　　要：为探索华北落叶松(Larix principis-rupprechtii)人工林土壤有效性钾的钾素形态分布与含量变化规律,定期取样并测定了幼龄林(5a,10a)、中龄林(20a)、近熟林(30a)及成熟林(40a)的土壤有效钾含量。结果表明,速效钾含量在0–20 cm土层高于20–40 cm与40–60 cm土层;在0–20 cm土层中,年内不同生育期不同林龄间速效钾含量差异显著(P<0.05);在0–20cm土层,土壤缓效钾和有效钾含量与其它土层含量差异不显著,年内不同生育期间土壤缓效钾和有效钾含量差异未达到显著性水平。随着林龄的增加,土壤速效钾呈先增加后降低的趋势,土壤有效钾与缓效钾呈下降趋势,成熟林(40a)的土壤有效钾与缓效钾含量明显低于其它林龄。研究区域各林龄华北落叶松人工林土壤速效钾与缓效钾在含量分级标准中达到中等及高等含量水平,有效钾含量丰富。The soil content of available K for 5a, 10a, 20a, 30a, 40a Larix principis-rupprechtii in the northern foot of the Qinling Mountains was analyzed from May to October to determine the seasonal dynamics in content of available K for L. principis-rupprechtii at different ages. The available K content at 0 to 20 cm in different months for different ages of L. principis-rupprechtii was higher than at the soil depth of 20 to 40 cm＇ and 40 to 60 cm＇. The soil content of available K at soil depth 0 to 20 cm in different months for different tree ages significantly differed （P〈0.05）. The soil content of effective K and slow-K at 0 to 20 cm in different months for different tree ages was higher than at the soil depth of 20 to 40 cm＇ and 40 to 60 cm＇. The soil content of effective K and slow-K at soil depth 0 to 20 cm in different months for different tree ages did not differ （P〈0.05）. At soil depth 0 to 20 cm, the soil content of available K at different tree ages had a parabolic variation, increasing first and then decreasing, whereas that of effective K and slow-K at different tree ages had a de- creasing variation; the soil content of effective K and slow-K of 40a L. principis-rupprechtii was higher than at other ages. The soil content of available K and slow-K for different ages of L. principis-rupprechtii without fertilization reached the middle and high levels, so the soil content of effective K was adequate.

关 键 词：林龄 华北落叶松 土壤 有效钾 

分 类 号：S714[农业科学—林学]