施肥对板栗林土壤CH_4吸收通量动态的影响  

Effects of fertilization on seasonal variations of soil CH_4 uptake fluxes in Chinese chestnut stands

作　　者：张蛟蛟[1] 李永夫[1] 姜培坤[1] 周国模[1] 刘娟[1] 

机构地区：[1]浙江农林大学环境与资源学院,浙江省森林生态系统碳循环与固碳减排重点实验室,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：《植物营养与肥料学报》2013年第6期1428-1437,共10页Journal of Plant Nutrition and Fertilizers

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

摘　　要：为了探明无机肥和有机肥施用对板栗林地土壤CH4吸收通量动态的影响,探讨板栗林地土壤CH4通量与环境因子之间的关系,在浙江省临安市典型板栗林样地布置施肥试验。于2011年6月2012年6月期间,采用静态箱-气相色谱法测定了不施肥(CK)、无机肥(IF)、有机肥(OF)和有机无机混合肥(OIF)处理下土壤CH4吸收通量的全年动态变化,并测定了土壤温度、土壤水分、水溶性有机碳(WSOC)和微生物量碳(MBC)含量。结果表明,板栗林土壤CH4吸收通量呈现明显的季节性变化,最大值出现在9月,最小值出现在2 3月;施肥处理均显著抑制了土壤CH4的吸收,具体表现为IF、OF和OIF处理下土壤CH4年吸收量与CK处理[CH43.09 kg/(hm2·a)]相比分别减少了7.0%、1.6%和4.4%。此外,施肥显著增加了土壤WSOC和MBC含量(P<0.05),且施肥使土壤碱解氮、铵态氮、硝态氮、全氮和有机质含量均有不同程度的增加。相关性分析表明,土壤CH4吸收通量与土壤表层5 cm处温度之间呈显著正相关(P<0.05),但与土壤水分、MBC含量之间没有显著相关性;土壤CH4吸收与土壤WSOC含量之间(除CK处理外)均具有显著相关性(P<0.05)。因此,施肥引起土壤理化性质[如NH+4-N、NO-3-N、全氮(TN)、有机碳(SOC)等]和WSOC含量的改变可能是施肥显著抑制了板栗林土壤CH4排放的主要原因。To investigate the effects of inorganic and organic fertilizers on seasonal variation of CH 4 uptake flux in the soil of Chinese chestnut stands and to explore the relationships between the CH 4 uptake flux and various environmental factors , a field study including control （ CK） , inorganic fertilizer （ IF） , organic fertilizer （ OF） , and half organic plus half inorganic fertilizer （ OIF） treatments was conducted in typical Chinese chestnut stands in Lin ’ an, Zhejiang Province.Soil CH4 uptake fluxes were analyzed by static closed chamber/GC technique, and soil temperature , soil water content , WSOC and MBC concentrations were determined as well .Results showed that soil CH4 uptake fluxes exhibited a strong seasonal pattern , with the maximum values in September and the minimum in February or March.Application of inorganic fertilizer significantly inhibited the soil CH 4 uptake（P〈0.05）, and annual accumulation of soil CH 4 uptake in IF, OF, and OIF treatments were 7.0%, 1.6%, and 4.4%lower than in CK [CH4 3.09 kg/（ha· a）], respectively.In addition, fertilization significantly increased soil WSOC and MBC concentrations（P〈0.05） and partly increased the concentrations of soil available nitrogen , ammonium nitrogen, nitrate nitrogen , total nitrogen , and soil organic matter .The correlation analysis showed that soil CH 4 uptake fluxes had a significant positive correlation with soil temperature at 5 cm depth （ P 〈0.05 ） , but had no significant correlation with soil water content and soil MBC concentration in all treatments .Soil CH4 uptake rate was correlated with soil WSOC concentration except in CK （ P 〈0.05 ） .In conclusion , the change of soil physicochemical properties（NH4＋-N, NO3--N, TN and SOC） and WSOC concentration caused by fertilization was probably the main reason for the inhibition of soil CH 4 uptake in Chinese chestnut stands induced by fertilization .

关 键 词：板栗林 CH4吸收通量 施肥 水溶性有机碳 微生物量碳 

分 类 号：S664.2[农业科学—果树学]