Diurnal Variation of Soil Respiration in Eucalyptus Plantations and Its Response to Environmental Factors
The LI-8150 Soil Carbon Flux Measurement System was used to continuously measure the diurnal changes of soil respiration rate and related environmental factors in a Eucalyptus urophylla plantation in the Leizhou Peninsula. This provided data for analyses of diurnal and nocturnal characteristics of soil respiration and its response to the changes of environmental factors,with the aim of supporting estimation of soil carbon emissions in plantation forest ecosystems. The results showed that the daily variation of soil respiration rates in the eucalypt plantation followed a bimodal pattern,with the maximum and minimum values of 3.95 μmol·m-2·s-1 and 3.29 μmol·m-2·s-1 at 4:00 am and 16:00 pm,respectively,and a daily mean value of 3.61 μmol·m-2·s-1. In terms of diurnal variations,soil respiration showed a significant negative correlation with the temperature and soil heat flux. In terms of monthly variation,soil respiration was highly,significantly and positively correlated with soil temperature and moisture. The daily soil carbon emissions ranged from 2.59 to 4.56 g·m-2. When estimating soil carbon emissions,it is important to consider the direction and intensity of environmental factors' effects on soil respiration at different time scales.
万方数据
维普
