摘要
以福州市区的城市草坪为研究对象,采用Li-8100对其土壤呼吸速率进行3 d的连续观测,研究草坪土壤呼吸昼夜变化特征及其影响因子。结果表明:1)草坪土壤呼吸有明显的日变化特征;2)草坪土壤呼吸速率昼夜变化呈单峰曲线模式,雨天最大值出现在21:30,阴天最大值出现在11:30,晴天最大值出现在15:30;3)阴雨天气时土壤温度和含水量与土壤呼吸速率的双因素回归关系不显著,晴天时土壤温度与土壤呼吸速率的回归性极显著(p<0.01),土壤温度可以解释该日土壤呼吸速率昼夜变化的70.13%,土壤含水量与土壤呼吸速率的线性关系仍不显著;土壤温度和含水量两个因素共同解释该日土壤呼吸昼夜变化的74.10%。
The soil respiration speed of urban lawn in Fuzhou city was continuously measured by using the Li-8100 system for 3 d to study its diurnal variation characteristic and to analyze the influence factors. The results show that the diurnal variation of soil respiration speed presents a unimodal curvilinear distribution, the maximum respiration speed in the rainy day, cloudy day and sunshine day is at 21：30, 11：30 and 15：30 respectively, there is no significant regression relations between soil temperature, soil water content and soil respiration speed in the rainy and cloudy day and there is the significant regression relation between soil temperature and soil respiration speed in the sunshine day. The soil temperature and water content both have the effect on diurnal variation of soil respiration speed, but the influence effect of soil temperature is more than soil water content.
出处
《贵州农业科学》
CAS
2008年第4期122-125,共4页
Guizhou Agricultural Sciences
基金
福建省教育厅项目(JB07069)
福建师范大学福建省大学生创新性实验计划项目"人工草坪生态系统CO2释放动态及其对浇水的响应"(Fjnu2007-004)
福建师范大学本科生课外科技计划项目"土壤主要温室气体通量对城市化过程中土地利用方式转变的响应"(BKL2007003)
关键词
城市草坪
土壤呼吸
昼夜动态
土壤温度
土壤含水量
urban lawn
soil respiration
diurnal dynamic
soil temperature
soil water content
