IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Alternative TitleSoil Heterotrophic Respiration Rate and Its Sensitivity to Temperature on Sloping Upland of Purple Soil
花可可; 王小国; 朱波
Corresponding Author朱波
Source Publication山地学报
Abstract为探讨紫色土旱坡地土壤异养呼吸速率特征,采用静态暗箱-气相色谱法于2010年12月至2011年10月观测了土壤异养呼吸日变化、季节性变化及土壤温度和湿度.结果表明:土壤异养呼吸速率日变化特征呈单峰型曲线,其最大值和最小值分别出现在16:00和08:00;土壤异养呼吸速率季节变化明显,冬季低,夏季高,最大值为654.2 mg CO2/(m2 h),最低值为38.1 mg CO2/(m2 h),平均值为325.2 mg CO2/(m2h),小麦季土壤异养呼吸CO2排放总量为307.9 g C/m2,玉米季为384.8 g C/m2,全年为692.7 g C/m2,玉米季土壤异养呼吸CO2排放总量显著高于小麦季(P<0.05);小麦季土壤异养呼吸敏感性参数Q10值高于玉米季,说明小麦季土壤异养呼吸速率对温度变化较玉米季敏感.地表温度和土壤5 cm温度的Q10值分别为3.16和3.22,土壤5 cm温度对土壤异养呼吸速率的影响较地表温度敏感;当土壤湿度(WFPS)高于60%时,土壤湿度和土壤异养呼吸速率为显著的负相关(R=-0.550,P=0.02),60%以下二者无显著关系,该研究可为调控紫色土旱坡地有机碳气态支出过程提供参考.
Other Abstract为探讨紫色土旱坡地土壤异养呼吸速率特征,采用静态暗箱-气相色谱法于2010年12月至2011年10月观测了土壤异养呼吸日变化、季节性变化及土壤温度和湿度。结果表明:土壤异养呼吸速率日变化特征呈单峰型曲线,其最大值和最小值分别出现在16:00和08:00;土壤异养呼吸速率季节变化明显,冬季低,夏季高,最大值为654.2 mg CO2/(m2h),最低值为38.1 mg CO2/(m2h),平均值为325.2 mg CO2/(m2h),小麦季土壤异养呼吸CO2排放总量为307.9 g C/m2,玉米季为384.8 g C/m2,全年为692.7 g C/m2,玉米季土壤异养呼吸CO2排放总量显著高于小麦季(P<0.05);小麦季土壤异养呼吸敏感性参数Q10值高于玉米季,说明小麦季土壤异养呼吸速率对温度变化较玉米季敏感。地表温度和土壤5 cm温度的Q10值分别为3.16和3.22,土壤5 cm温度对土壤异养呼吸速率的影响较地表温度敏感;当土壤湿度(WFPS)高于60%时,土壤湿度和土壤异养呼吸速率为显著的负相关(R=-0.550,P=0.02),60%以下二者无显著关系,该研究可为调控紫色土旱坡地有机碳气态支出过程提供参考。; The research on soil heterotrophic respiration is greatly helpful to predict accurately the soil organic carbon balance of agriculture ecosystem. Experimental studies overwhelmingly focus on characters of soil respiration based on soil and plant system in agriculture ecosystem. However,relatively little information has focus on soil heterotrophic respiration,especially for sloping upland under traditional fertilizer practice. Hence,We conducted a research to monitor soil heterotrophic respiration diurnal,seasonal changes with closed chamber-chromatographic technique and assessed the impacting factors of soil heterotrophic respiration rate on sloping upland of purple soil in Sichuan Basin at Yanting Agro-ecological Experimental Station of purple soil,CAS. Results showed that the diurnal pattern of soil heterotrophic respiration exhibited single peak trend,with the minimum value occurring around 08: 00 hours ( local time) and the maximum value around 16: 00 hours. Soil heterotrophic respiration rates were higher in summer than in winter. The maximum and minimum for the rate were 654. 2 mg CO2 /( m2 /h) and 38. 13 mg CO2 / /( m2 /h) respectively,with the mean of 325. 2 mg CO2 /( m2 /h) . The average soil heterotrophic respiration
rates during the maize season was higher than the wheat season following the values of 408. 2 mgCO2 /( m2 /h) and 212. 9 mg CO2 ( m2 /h) respectively. The cumulative CO2 emissions from soil heterotrophic respiration were 307. 9 gC /m2,384. 8 gC /m2 for the wheat and maize growing seasons respectively. Furthermore,the seasonal soil
heterotrophic respiration rates were significantly affected by soil temperature. With the change in the rate of flux for each 10°C increase in temperature ( Q10 ) in wheat season were greater than in maize season,were 3. 22 and 3. 16 for soil 5 cm and 0 cm temperature in wheat season. In addition,when soil moisture was above 60%,there was a significant negative correlation between soil moisture and soil heterotrophic rate. In contrast, it was no longer had a significant impact on soil heterotrophic rate when soil moisture was above 60%. The results could provide a better understanding of soil organic carbon gaseous loss on sloping upland of purple soil.
Keyword土壤异养呼吸速率 土壤温度 土壤湿度 旱坡地 紫色土
Indexed ByCSCD
Funding Organization中国科学院战略先导专项子课题“西南农田土壤固碳潜力与速率研究”(XDA05050506)
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花可可,王小国,朱波. 紫色土旱坡地土壤异养呼吸速率及其温度敏感性[J]. 山地学报,2013,31(5):548-554.
APA 花可可,王小国,&朱波.(2013).紫色土旱坡地土壤异养呼吸速率及其温度敏感性.山地学报,31(5),548-554.
MLA 花可可,et al."紫色土旱坡地土壤异养呼吸速率及其温度敏感性".山地学报 31.5(2013):548-554.
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