不同氮沉降水平下两种林型的主要土壤酶活性  

Soil enzyme activities under two forest types as affected by different levels of nitrogen deposition

作　　者：赵玉涛[1,2] 李雪峰[1] 韩士杰[1] 胡艳玲[1,2] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100039

出　　处：《应用生态学报》2008年第12期2769-2773,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(90411020);中国科学院知识创新工程重要方向资助项目(KZCX2-YW-416-01)

摘　　要：模拟研究了天然阔叶红松林和天然次生杨桦林不同氮沉降(0、25和50kgN.hm-2.a-1)水平下土壤酶活性(纤维素酶、多酚氧化酶和蔗糖酶)的变化趋势.结果表明:氮沉降增加对土壤酶活性的作用与林分类型有关,短期施氮可以显著影响土壤酶的活性;高氮沉降降低了土壤多酚氧化酶活性,且随着多酚氧化酶活性的降低,两种林型土壤纤维素酶和蔗糖酶活性也有降低的趋势.A simulation test was conducted to study the change trends of soil cellulase, polyphenol oxidase, and sucrase activities under natural broadleaf-Korean pine （Pinus koraiensis） and secondary poplar （ Populus davidiana） -birch （ Betula platyphylla） mixed forests as affected by 0, 25, and 50 kg · hm^-2 . a^-1 of N deposition. The results showed that the effects of elevated N deposition on test enzyme activities varied with forest type, and short-term nitrogen addition could significantly affect the test enzyme activities. High N deposition decreased soil polyphyneol oxidase activity, and correspondingly, soil cellulase and sucrase activities also had a trend of decrease.

关 键 词：阔叶红松林 次生杨桦林 土壤酶 氮沉降 

分 类 号：S714[农业科学—林学]