土壤剧烈扰动条件下地面灌水对土壤呼吸的影响

Influence of surface irrigation on soil respiration under intensively disturbed soil

借助土箱试验观测研究土壤剧烈扰动条件下的土壤呼吸,并分析灌溉管理与土壤扰动的综合影响。结果表明:由于土壤剧烈扰动导致土壤呼吸通量出现短期的迅速增加,土壤剧烈扰动后两个处理的土壤呼吸峰值均超过800 mg/(m2·h),而且大部分时间在300 mg/(m2·h),高于大部分相关报道。对于SI处理,在适宜的水分条件(102%WHC)和土壤剧烈扰动的协同作用下,使土壤CO2呼吸峰值超过了900 mg/(m2·h)。对于SDI+SI处理,由于剧烈扰动的影响在非适宜的水分条件下出现了800 mg/(m2·h)以上的CO2排放峰值,土壤剧烈扰动后灌溉能够显著降低土壤呼吸通量,灌水后随水分达到适宜范围(98%WHC),出现水分调控导致的另一个小高峰,但本研究中水分高峰仅为土壤剧烈扰动后峰值的67%。

The paper studied the soil respiration under the condition of intensively disturbed soil by aid of incubation experiment and analyzed the influence of combined irrigation and soil disturbance .The results show that the intensive soil disturbance results in a short-term quick increase of soil respiration .After the soils of two treatment were intensively disturbed , their respiration peak values overhanded 800 mg/( m2 · h) ,and were 300 mg/( m2 · h) for most of the time and higher than that in most reports .For surface irrigation treatment,the peak of soil respiration was higher than 900 mg/(m2· h) under the com-bined effect of both intensive soil disturbance and proper moisture conditions ( about 102%WHC ) .For deep water application treatment , a peak ( higher than 800 mg/( m2 · h) ) appeared under the condition of intensive soil disturbance and the soil moisture of not being fit .The irrigation obviously decreased the amount of soil respiration after the soil was intensively disturbed .The soil moisture appeared another peak when the soil moisture reached the suitable range (98%WHC) .But the peak of soil moisture in the re-search was about 67%of the peak after the soil was intensively disturbed .