摘要
采用开顶式生长室(open top chamber,OTC)模拟增温,同步监测了亚高山人工针叶林和天然针叶林表层土壤温、湿度的变化,以及模拟增温初期土壤转化酶、脲酶、过氧化氢酶和多酚氧化酶活性的变化.结果表明:在整个生长季节中,OTC使人工林和天然林5cm土壤日平均温度分别增加0.61℃和0.56℃,10cm体积含水量分别下降4.10%和2.55%;模拟增温增加了土壤转化酶、脲酶、过氧化氢酶和多酚氧化酶活性.增温与林型的交互作用对土壤脲酶和过氧化氢酶活性有显著影响,而对转化酶和多酚氧化酶影响不显著.增温对过氧化氢酶活性的影响与季节变化相关.在各处理下,天然林土壤酶活性显著高于人工林.土壤酶活性季节动态与土壤温度有着较大相关性,而与土壤水分季节变化关系不明显.模拟增温易于增加土壤酶活性,但增温效应和林型、酶种类和季节变化有一定关系;亚高山针叶林土壤酶活性主要受控于土壤温度,而与土壤水分关系不大.
With open top chamber（OTC）,this paper studied the effects of simulated warming on the activities of soil invertase,urease,catalase,polyphenol oxidase in two contrasting subalpine coniferous forests（a dragon spruce plantation and a natural conifer forest） in west Sichuan.The dynamic changes of soil temperature and soil moisture were monitored synchronously.In the whole growth season,simulated warming enhanced the daily mean temperature at soil depth 5 cm by 0.61 ℃ in the plantation,and by 0.55 ℃ in the natural forest.Conversely,the volumetric moisture at soil depth 10 cm was declined by 4.10% and 2.55%,respectively.Simulated warming also increased soil invertase,urease,catalase,and polyphenol oxidase activities.The interactive effect of warming and forest type was significant on soil urease and catalase,but not significant on soil invertase and polyphenol oxidase.The warming effect on soil catalase depended,to some extent,on season change.In all treatments,the soil enzyme activities in the natural forest were significantly higher than those in the plantation.The seasonal changes of test soil enzyme activities were highly correlated with soil temperature,but less correlated with soil moisture.This study indicated that warming could enhance soil enzyme activities,and the effect had definite correlations with forest type,enzyme category,and season change.The soil enzyme activities in the subalpine coniferous forests were mainly controlled by soil temperature rather than soil moisture.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第11期2727-2733,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30800161
30800165)
中国科学院西部行动计划(二期)项目(KZCX2-XB2-02)
中国科学院成都生物研究所领域前沿项目(08B2031
Y0B2021100)和中国科学院知识创新工程重要方向项目(KSCX2-YW-Z1023)资助
国家"十一五"科技支撑计划重点项目(2008BAD98B06)
关键词
土壤酶活性
开顶式生长室
全球气候变化
亚高山针叶林
青藏高原东缘
soil enzyme activity
open top chamber
global climatic change
subalpine coniferous forest
eastern Tibetan Plateau.
