摘要
采用野外观测与室内模拟试验相结合的方法．研究了湿地土壤和垦殖10年的农田耕作后土壤呼吸通量、微生物量碳、土壤基础呼吸、土壤qCO2值、水溶性有机碳的动态特征。研究结果表明：小叶章湿地耕作后，土壤含水量明显下降（P〈0．05）；土壤CO2通量在最初的1-2d形成一个排放高峰，农田耕作土壤CO2通量一直显著高于未耕作土壤（P〈0．01）。农田土壤微生物量碳含量显著低于小叶章湿地（P〈0．001）。在耕作后最初的1～3d，湿地和农田土壤微生物量碳均没有显著的变化；之后，土壤微生物量碳迅速增加，显著高于未耕作土壤。观测时间内，耕作农田土壤微生物量碳含量始终显著高于未耕作土壤（P〈0．01）。垦殖10年农田土壤耕作后，对土壤水溶性有机碳含量无显著影响。湿地耕作后。土壤水溶性有机碳迅速增加。在耕作后80d内，土壤水溶性有机碳含量显著高于未耕作土壤（P〈0．01）。之后，则低于未耕作土壤。
Field experiment and laboratory simulated experiment were conducted to study the dynamic process of soil respiration flux, SMBC, basal respiration, metabolic quotient （qCO2） and DOC for Doyeuxia augustifolia wetland and cultivating-ten-year soil （agricultural soil） after tillage. The results showed that soil water content of Doyeuxia augustifolia wetland decreased significantly after soil tillage. Soil CO2 flux reached a peak in primary 1 -2 days after tillage. CO2 flux of cultivated soil with tillage was higher all the time than that of soil without tillage （ p 〈 0. 01）. SMBC content of agricultural soil was higher significantly than that of Doyeuxia augustifolia wetland （ p 〈 0. 001）. SMBC content of wetland and agricultural soil had no significant difference in the primary 1- 3 days after tillage. Since then SMBC content of soil with tillage increased rapidly and was higher than that of soil without tillage. For agricultural soil, SMBC content of soil with tillage was higher all through than that of soil without tillage. Soil tillage had no significant influence of DOC content on agricultural soil. However, DOC content of wetland increased rapidly after tillage. For wetland, DOC content of tillage was higher significantly than that of no tillage in primary 80 days （ p 〈 0. 01）, while lower than that of no tillage after 80 days.
出处
《水土保持学报》
CSCD
北大核心
2008年第2期146-150,共5页
Journal of Soil and Water Conservation
基金
农业部农业结构调整重大研究专向(04-01-03B)
青岛农业大学高层次人才启动基金(630638)
关键词
水溶性有机碳
微生物量碳
土壤基础呼吸
CO2通量
dissolved organic carbon （DOC）
soil microbial biomass carbon （SMBC）
soil basal respiration
CO2 flux
