摘要
设计了一套适合于FACE(free airCO2 enrichment)平台的旱地土壤气体CO2 浓度廓线测定方法 ,并将其应用于田间实验 .在江苏省无锡市郊区具有太湖地区典型水稻土的稻麦轮作农田 ,对FACE和对照麦田以及裸土 0～ 30cm土层的土壤气体CO2 浓度廓线进行了观测研究 .结果表明 ,所采用的方法满足进行旱地农田土壤气体CO2 浓度廓线研究的要求 ;在 0～ 30cm土层中 ,上层土壤气体中的CO2 向上垂直扩散要比下层土壤快 ;在作物旺盛生长期 ,大气CO2 浓度升高 2 0 0± 4 0 μmol·mol-1使 0～ 30cm土层的土壤气体CO2 浓度显著提高 14 %± 5 % (t 检验P <0 .0 0 1) .
A method was specially designed and applied for measuring CO 2 concentration of soil air over the non-waterlogged period of a rice-wheat rotation on an available area of about 1.6m^2 in a FACE (free-air CO 2 enrichment) study. Based on measuring the CO 2 concentration over the soil profile of 0～30 cm in depth using this method, the CO 2 profile in the soils of wheat fields under elevated and ambient CO 2 and the bare land under ambient CO 2 was investigated and some preliminary results were obtained. Within 0～30 cm in soil depth,CO 2 in the pores of the upper soil layers vertically diffused upwards much more quickly than that in the lower soil layers. During the period with active wheat growth, elevated atmospheric CO 2 by 200±40μmol·mol~ -1 significantly increased the CO 2 concentration in soil air within 0～30 cm in depth by 14%±5% (t-test, P<0.001).
出处
《应用生态学报》
CAS
CSCD
2002年第10期1249-1252,共4页
Chinese Journal of Applied Ecology
基金
国家自然科学基金 (4 0 175 0 3 0 )
中国科学院知识创新重要方向资助项目 (KZCX2 40 8和KZCX1 SW 0 1) .
