摘要
在研究酸雨区不同林龄杉木人工林土壤酶活性季节动态的基础上,进一步分析了土壤养分与酶活性的相关关系。结果表明:(1)土壤pH随土层加深而增大,养分含量及酶活性均随土层加深而减少。(2)多酚氧化酶、过氧化氢酶、过氧化物酶活性表现为成熟林高于中龄林和幼龄林,而蔗糖酶活性随林龄增加呈先增加后降低的变化趋势。(3)蔗糖酶、多酚氧化酶活性在各林龄中均为冬、春、秋季较高,夏季最低;脲酶活性为秋季最高;过氧化氢酶活性为夏季>秋季>春、冬季,春季与冬季差异不显著;过氧化物酶活性为秋季显著低于冬、夏、春季。(4)土壤酶活性与pH呈显著负相关,与全氮、全磷、水解性氮、有效磷、速效钾、有机质含量呈显著正相关。
Seasonal dynamics of the chronosequence soil enzyme activities in different tree ages of Cunninghamia lanceolata planta-tion in acid rain area was investigated .In addition, the correlation between nutrients and enzyme activities in soil was also analyzed . The results indicated as follows .（ 1 ） The soil pH increased with the depth of soil .Soil nutrient contents and enzyme activities declined with the depth of soil.（2） The activities of polyphenol oxidase , peroxidase, catalase in the mature plantation were higher than those in the middle plantation and young plantation , and the tend of sucrase activity firstly increased and then decreased with the tree ages.（3） The activities of sucrase, polyphenol, oxidase in spring, winter and autumn were higher than those in summer;the activity of urease in autumn was higher than that in spring , summer and winter; the activity of catalase showed the following trend：summer＆gt;autumn＆gt;spring and winter , with non-significant difference between spring and winter;the activity of peroxidase in autumn was significantly lower than that in winter , spring and summer.（4） Soil enzyme activities had significant negative correla-tion with soil pH, and had significant positive correlation with soil total nitrogen , total phosphorus, hydrolyzable nitrogen, available phosphorus , available potassium , organic matter content .
出处
《福建林学院学报》
CSCD
北大核心
2014年第2期131-137,共7页
Journal of Fujian College of Forestry
基金
国家自然科学基金项目(30972358
31270676)
福建省科技重大专项(2012nz0001)
关键词
酸雨区
杉木人工林
林龄
土壤酶活性
季节动态
acid rain area
Cunninghamia lanceolata plantation
tree ages
soil enzyme activities
seasonal dynamic
