摘要
以同步模拟大气CO_2浓度和温度升高的田间开放式气候变化平台为依托,研究大气CO_2浓度和温度的对照处理(CK)、CO_2浓度升高(CE)、试验增温(WA)以及两者同时升高(CW)对小麦土壤呼吸、脲酶和转化酶的影响。结果表明:与对照相比,CE处理的小麦季土壤呼吸速率没有显著变化,而升温处理(WA和CW)的土壤呼吸速率显著提高;在分蘖期土壤脲酶和转化酶活性没有明显变化,在抽穗和成熟期,升温处理显著提高了转化酶活性,而CE处理显著提高了抽穗期转化酶活性;与对照相比,CE处理土壤脲酶活性没有变化,而WA处理显著提高了抽穗期的土壤脲酶活性。可见,大气CO_2浓度和温度升高对不同生育期的土壤呼吸和酶活性影响存在差异,而且土壤呼吸、脲酶和转化酶活性对温度升高的响应比较敏感。
The aim of this study was to examine the effects of elevated atmospheric CO_2 concentration and temperature on soil respiration and urease and invertase activity in an open field. Field treatments included ambient CO_2 concentration and air temperature（CK）, elevated CO_2concentration（CE）, experimental air warming（WA）, and interactive CO_2 enrichment and air warming（CW）. The results showed that soil respiration rates increased significantly under WA and CW as compared to that under CK, while those of CE did not change significantly in the wheat-growing season. At the tillering stage, there were no changes in the activities of urease or invertase. However, the invertase activity under CW and WA was increased significantly at the heading and ripening stages, while that of CE only increased at the heading stage.Compared to CK, there was no significant change in the urease activity under CE treatment, but WA treatment resulted in increases in the urease activity at ripening stages. These findings suggested that the effects of elevated CO_2 and warming on soil respiration and enzyme activities were different among the tillering, heading, and ripening stages. The responses of soil respiration, urease, and invertase were much more sensitive to warming than to elevated CO_2.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2017年第8期1484-1491,共8页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(41501304
31100083)
公益性行业(农业)科研专项(200903003)~~
关键词
CO2浓度增加
试验增温
冬小麦
酶活性
土壤呼吸
elevated CO2 concentration
experimental warming
winter wheat
enzyme activity
soil respiration
