摘要
以长期不同施肥处理红壤水稻土为研究对象,布置不同温度下(15、25和35℃)的室内培养试验,研究有机碳矿化的温度敏感性及施肥对土壤有机碳矿化的影响,并分析土壤有机碳矿化与土壤理化性质和不同形态碳素之间的关系。结果表明,培养前期(0~7 d),土壤有机碳矿化速率快速下降,之后逐渐降低并最终趋于稳定。温度升高提高了土壤有机碳矿化速率、累积矿化量和矿化率。磷肥和有机肥的施用提高了土壤有机碳累积矿化量。各处理土壤有机碳矿化的温度敏感性系数Q10为1.31~1.75,施肥提高了土壤有机碳矿化的温度敏感性。Q10与有机碳、全量和速效氮磷、微生物生物量碳、易氧化有机碳和胡敏酸碳呈显著或极显著的正相关关系。3种培养温度下土壤有机碳累积矿化量均与pH呈显著负相关,与有机碳和全氮呈显著或极显著正相关。25℃和35℃培养时,土壤有机碳累积矿化量与微生物生物量碳、胡敏酸碳和富里酸碳显著或极显著正相关。
Red paddy soils under different fertilization treatments were incubated at 15℃,25℃ and 35℃,and then the effects of temperature and long-term fertilization on soil organic carbon(SOC)mineralization,and the relationships between SOC mineralization and soil physiochemical properties as well as SOC fractions were studied.The results indicated that the mineralization rate of SOC decreased rapidly during the early stage of incubation(0–7 d),then decreased gradually and reached a stable state finally.The mineralization rate,cumulative mineralization,and mineralization ratio of SOC all increased with temperature.The applications of phosphate fertilizer and organic manure both increased cumulative mineralization of SOC.The temperature sensitivity of SOC mineralization(Q10)was 1.31–1.75 under different fertilization treatments.Fertilizations increased Q10 values compared with the no fertilization treatment.Q10 values were positively correlated with SOC,total and available nitrogen and phosphate,microbial biomass carbon,easily oxidized organic carbon,and humic acid carbon.The cumulative amounts of SOC mineralization was negatively correlated with soil pH,but positively correlated with SOC and total nitrogen at the three temperatures.At 25℃ and 35℃,the cumulative amounts of SOC mineralization had positive correlations with soil microbial biomass carbon,humic acid carbon and fulvic acid carbon.
作者
陈晓芬
吴萌
江春玉
刘明
李忠佩
CHEN Xiaofen;WU Meng;JIANG Chunyu;LIU Ming;LI Zhongpei(State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《土壤》
CAS
CSCD
北大核心
2019年第5期864-870,共7页
Soils
基金
国家自然科学基金青年基金项目(41601270)
国家自然科学基金重点项目(41430859)
中国博士后基金项目(2016M601904)资助
关键词
温度
长期施肥
红壤水稻土
有机碳矿化
Temperature
Long-term fertilization
Red paddy soil
Soil organic carbon(SOC)mineralization
