单 位：
厦门大学建筑与土木工程学院;福州大学建筑学院
关键词：
西双版纳;热带季雨林;土壤呼吸;影响因子
摘 要：
为了探寻西双版纳热带季雨林土壤呼吸变化规律及其影响因素,分别于2014年不同季节测定了土壤呼吸强度及相关环境因子,同时取相应点表土(0—10cm)测定土壤养分,利用指数模型和线性模型分析土壤呼吸与土壤温度和湿度的关系。结果表明:热带季雨林大气温度的日变化趋势均为单峰曲线;落叶季雨林和半常绿季雨林大气湿度日变化均呈"V"字形变化趋势;0—10cm土壤温度与大气温度变化趋势相一致,在14:00左右达到峰值;土壤湿度均呈"V"字形变化趋势,在14:00达到最低,此后有所回升,局部有所波动。在时间尺度上,2种热带季雨林土壤呼吸均表现为单峰型,且峰值出现的时间基本一致,在14:00左右达到最大,最低值出现在早上6:00,相同时间常绿季雨林土壤呼吸速率高于落叶季雨林。2种热带季雨林土壤呼吸季节性差异显著(p<0.05),呈先增加后降低的趋势,均表现为秋季>夏季>冬季>春季。2种热带季雨林土壤呼吸与土壤温度之间关系以指数方程拟合最好,土壤温度可以解释土壤呼吸强度的53.7%~71.0%;落叶季雨林土壤呼吸与土壤湿度之间关系以线性方程拟合最好,常绿季雨林土壤呼吸与土壤湿度之间关系以指数方程拟合最好,土壤湿度可以解释土壤呼吸强度的52.1%~62.3%。通过偏相关分析可知,西双版纳热带季雨林土壤呼吸均与有机质和土壤速效养分含量呈极显著的相关关系(p<0.01),与土壤全氮含量呈显著的相关关系(p<0.05),而与全磷含量并没有显著的相关性(p>0.05),其中常绿季雨林的相关系数均高于落叶季雨林。
译 名：
Soil Respiration and Impact Factors of Tropical Seasonal Rainforests in Xishuangbanna,Yunnan Province
作 者：
WANG Yajun;YU Shanshan;College of Architecture,Fuzhou University;College of Architecture and Civil Engineering,Xiamen University;
关键词：
Xishuangbanna;;tropical seasonal rainforests;;soil respiration rate;;impact factors
摘 要：
In order to explore soil respiration and impact factors of tropical seasonal rainforests in Xishuangbanna,measurements of soil respiration,soil temperature and moisture content,soil nutrients(0—10cm)during different seasons in 2014 by Li-6400,and characteristics of the daily and seasonal variations of soil respiration and their controlling factors were presented,and exponential model and linear model were used to analyze the relations between soil respiration and soil temperature and humidity.The results showed that daily air temperature of tropical seasonal rainforests showed the single peak curve,and daily atmospheric moisture had a V-shape variation trend,soil temperature in 0—10cm depth had the same variation trend as the atmospheric temperature,which the peak occurred at 14:00,and soil moisture had the V-shape variation trend with local fluctuation.The daily soil respiration rate showed a single peak curve which the daily maximum of soil respiration rate occurred at 14:00and the minimum occurred at 6:00,and at same time,evergreen monsoon forest soil respiration rate was higher than that in the deciduous monsoon forest.These two tropical seasonal rainforest soil respiration rates had the significant seasonal differences(p<0.05),which showed the order:autumn>summer>spring>winter.We found that soil respiration was extremely significant correlated with soil temperature in 0—10cm depth,which could be describled by exponential equation(p<0.01),the exponential regression model could explain 53.7%~71.0% of the soil respiration,and soil respiration was extremely significant correlated with soil moisture content in 0—10cm depth,which followed the linear equation(p<0.01),the exponential regression model could explain 52.1% ~52.2% of the soil respiration.Through the partial correlation analysis to exclude other environment factors,we found that soil respiration had the extremely significantly correlation with soil organic matter and soil available nutrients(p<0.01),had significantly correlation with soil nitrogen content(p<0.05)and no significantly correlation with soil phosphorus(p>0.05),of which the correlation coefficients in the evergreen monsoon forest were higher than those in the deciduous monsoon forest.
