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2006~2007年对喀斯特石漠化地区土壤剖面中CO2、N2O和CH4的浓度分布进行观测.结果表明,土壤剖面中CO2、N2O和CH4浓度分别介于530.2~31512.6、0.27~0.67和0.1~3.5μL.L-1.总体上,自地表向下,CO2和N2O浓度逐渐增大,CH4浓度则为逐渐减小,但在阴冷潮湿的10、11月和1月,15cm以下土层中CO2和N2O浓度随着深度的增加逐渐减小,CH4浓度则明显增加.土壤温度、水分同时影响剖面中CO2、N2O和CH4的时空分布,但影响效应以及作用的土层深度有所不同.相关分析结果表明,土壤中CO2和N2O浓度的时空分布显著正相关(r为0.780~0.894,p<0.05~0.01),相关关系受环境因子的影响;CO2和CH4的时空分布则呈显著负相关关系(r=330,p<0.01);N2O和CH4的空间分布为互逆关系,但只在土壤水分较大月份达到显著水平(r为-0.829~-0.956,p<0.05~0.01).
The concentrations of CO2, N2O and CH4 in the soil profiles in the karst rocky desertification area were observed from 2006 to 2007. The results showed that the concentrations of CO2, N2O and CH4 in the soil profiles ranged from 530.2 to 31512.6, from 0.27 to 0.67 and from 0.1 to 3.5 In general, from the surface downwards, the concentrations of CO2 and N2O gradually increased and the concentrations of CH4 gradually decreased. However, in the cold, wet days of 10, November and January, the CO2 and The concentration of N2O decreases with the increase of depth and the concentration of CH4 increases obviously.The soil temperature and water affect the spatiotemporal distribution of CO2, N2O and CH4 in the section at the same time, but the influence effect and depth of soil layer are different.The results of correlation analysis (R = 0.780-0.894, p <0.05-0.01). The correlation was affected by environmental factors. The spatial and temporal distribution of CO2 and CH4 showed a significant negative correlation (r = 330, p <0.01). The spatial distributions of N2O and CH4 were reciprocal but only reached significant levels in the month when soil moisture was high (r = -0.829-0.956, p <0.05-0.01).