施用竹叶生物质炭对板栗林土壤CO_2通量和活性有机碳库的影响  

Effect of bamboo leaf biochar addition on soil CO_2 efflux and labile organic carbon pool in a Chinese chestnut plantation

作　　者：王战磊[1,2] 李永夫[1,2] 姜培坤[1,2] 周国模[1,2] 刘娟[1,2] 

机构地区：[1]浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室,浙江临安311300 [2]浙江农林大学亚热带森林培育国家重点实验室培育基地,浙江临安311300

出　　处：《应用生态学报》2014年第11期3152-3160,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31170576);浙江省科技厅重点项目(2011C12019);浙江省重点科技创新团队项目(2010R50030)资助

摘　　要：于2012年7月—2013年7月,在浙江省临安市典型板栗林样地采用静态箱-气相色谱法测定了施用竹叶生物质炭后板栗林土壤CO2排放速率及土壤温度、含水量、水溶性有机碳(WSOC)和微生物生物量碳(MBC)含量变化.结果表明:板栗林土壤CO2排放通量呈现显著的季节性变化特征.在试验的第1个月中,生物质炭处理土壤CO2排放通量显著高于对照(无生物质炭),但之后无显著差异;生物质炭处理的土壤CO2通量年均值和年累积排放量与对照相比无显著差异.生物质炭处理土壤MBC含量年均值(362 mg·kg-1)显著高于对照(322 mg·kg-1),而土壤WSOC年均值无显著差异.土壤CO2排放通量与不同土层土壤温度之间均具有显著相关性;生物质炭处理的土壤呼吸温度敏感系数Q10值显著高于对照;土壤CO2排放通量与WSOC含量之间具有显著相关性,而与土壤含水量和MBC含量均无显著相关性.综上所述,施用竹叶生物质炭对板栗林土壤CO2年累积排放量无显著影响,但增加了土壤Q10值;土壤温度和WSOC含量是影响板栗林土壤CO2排放的主要因素.Effect of bioehar addition on soil CO2 efflux in a typical Chinese chestnut （ Castanea mol- lissima） plantation in Lin＇ an, Zhejiang Province, China was investigated from July 2012 to July 2013 by the static closed chamber-GC technique. Soil temperature, soil moisture, WSOC and MBC concentrations were determined as well. Results showed that soil CO2 efflux exhibited a strong seasonal pattern. Compared with the control （without biochar application）, the biochar treatment increased the soil CO2 efflux only in the first month since application, and then the effect diminished thereafter. There were no significant differences in the annual cumulative value of soil CO2 efflux served regardless of the treatment and soil layer. The apparent temperature sensitivity （ Q10） of soil CO2 efflux in the biochar treatment was higher than that in the control. Soil CO2 efflux was related to soil WSOC concentration but not with soil MBC or moisture content. To conclude, the application of bamboo leaf biochar did not affect the annual cumulative CO2 emission in the Chinese chestnut plantation but increased the Q10, and the CO2 efflux was predominantly controlled by the soil tern-perature and soil WSOC level.

关 键 词：板栗林 CO2排放 生物质炭 水溶性有机碳 微生物生物量碳 

分 类 号：S664.2[农业科学—果树学]