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Temporal and Spatial Variations of Greenhouse Gases Concentrations in Soils in Karst Stone Desertification Areas in Central Part of Guizhou Province
Authors
刘丛强
刘芳
吕迎春
王仕禄
Publication date
31 December 2008
Publisher
Abstract
2006~2007年对喀斯特石漠化地区土壤剖面中CO_2、N_2O和CH_4的浓度分布进行观测.结果表明,土壤剖面中CO_2、N_2O和CH_4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,CO_2和N_2O浓度逐渐增大,CH_4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CO_2和N_2O浓度随着深度的增加逐渐减小,CH_4浓度则明显增加.土壤温度、水分同时影响剖面中CO_2、N_2O和CH_4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CO_2和N_2O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;CO_2和CH_4的时空分布则呈显著负相关关系(r=330,p<0.01);N_2O和CH_4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)
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Last time updated on 18/09/2018