摘要
采用碱液吸收法(AA法)对北京西部山区不同降雨处理的典型侧柏林的土壤呼吸速率做了测定。同时测定了土壤呼吸测定点的土壤温度、土壤水分及气温和湿度等气象因子。结果表明5 mm、10 mm、20 mm降雨处理对侧柏林土壤呼吸都有促进作用,而50 mm降雨处理以及50 mm频率降雨对土壤呼吸的促进作用不明显。研究发现降雨导致土壤含水量升高并造成土壤呼吸的温度敏感性降低,Q10为1.1左右。通径分析的结果表明7 cm土壤温度、空气温度、大气相对湿度对各降雨处理的土壤呼吸速率的直接效应是最为显著的,其中对土壤呼吸影响最大的因素是温度。
Soil respiration rates in a Platycladus orientalis forest in Beijing western mountain areas were determined by using alkali absorption technique, while soil temperature, soil mdisture, air temperature, humidity and other meteorological factors were also monitored at the site. Results showed that 5 mm,10 mm and 20 mm rainfall treatment had promotion impact to the soil respiration, while it didn＇t have a significant promotion impact on soil respiration under 50 mm rainfall and 50 mm frequency rainfall treatment. Rains could cause soil moisture increased, which cause the temperature sensitivity of soil respiration reduced. Results of path analysis showed that 7 cm soil temperature, air temperature, relative atmospheric humidity have the most significant effects on soil respiration rate in all rainfall treatments, and the temperature has the biggest effect on soil respiration.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第9期1-6,共6页
Environmental Science & Technology
基金
国家自然科学基金(30500389)
中央高校基本科研业务费专项资金(TD2011-03)
北京市大学生科学研究与创业行动计划(121002214)
关键词
土壤呼吸
降雨
侧柏林
通径分析
温度敏感性
soil respiration
rainfall
Platycladus orientalis forest
path analysis
temperature sensitivity
