),屈志强,韩国栋*()
),QU Zhi-Qiang,HAN Guo-Dong*()
图6. 2014-2016年生态系统碳交换与土壤温度、土壤湿度的关系。NEE, 生态系统净碳交换; ER, 生态系统呼吸; GEP, 生态系统总初级生产力。2014年采用指数方程对NEE、ER、GEP与土壤温度、土壤湿度间的关系拟合。2015年采用指数方程对ER与土壤温度间关系拟合, 采用线性方程对NEE、GEP与土壤温度间关系拟合。2016年采用线性方程对土壤温度、土壤湿度间关系拟合。每一个数据点为当日观测的实测值。
Fig. 6. The relationship between ecosystem carbon exchange and soil temperature and soil moisture from 2014 to 2016. NEE, net ecosystem carbon exchange; ER, ecosystem respiration; GEP, gross primary productivity. In 2014, the exponential model was used to fit the relationship between carbon flux and soil temperature and soil moisture, In 2015, the exponential model was used to fit the relationship between ER and soil temperature, and the linear model was used to fit the relationship between NEE, GEP and soil temperature. In 2016, the linear model was used to fit the relationship between carbon flux and soil temperature and soil moisture. Each data point is the observed value of the day.
