温度对黑色石灰土原土及不同粒径土壤颗粒有机碳矿化的影响  

Effects of Temperature on Organic Carbon Mineralization of Rendzina and Different Soil Particles

作　　者：杨芳 段惠敏[2] 段建军 王小利[1] 罗湄宏 周先伟 郭振 YANG Fang;DUAN Huimin;DUAN Jianjun;WANG Xiaoli;LUO Meihong;ZHOU Xianwei;GUO Zhen(College of Agriculture,Guizhou University,Guiyang 550025,China;Panxi Geological Team,Sichuan Bureau of Geology & Mineral Resources, Xichang 651000,China;College of Tobacco Science,Guizhou University/Key Laboratory of Tobacco Quality Research in Guizhou Province,Guiyang 550025,China;Agricultural Service Center of Daheba of Sinan,Tongren 565102,China;Shaanxi Provincial Land Engineering Construction Group Co.,Ltd.,Xi’an 710075,China)

机构地区：[1]贵州大学农学院,贵州贵阳550025 [2]四川省地质矿产勘查开发局攀西地质队,四川西昌651000 [3]贵州大学烟草学院/贵州省烟草品质研究重点实验室,贵州贵阳550025 [4]思南县大河坝镇农业服务中心,贵州铜仁565102 [5]陕西省土地工程建设集团有限责任公司,陕西西安710075

出　　处：《河南农业科学》2019年第2期68-76,共9页Journal of Henan Agricultural Sciences

基　　金：国家自然科学基金项目(41361064;31860160)

摘　　要：为探究黑色石灰土原土及不同粒径土壤颗粒有机碳矿化的差异及其对温度的响应,加深对喀斯特地区土壤有机碳矿化的认识,在15、25、35℃3种温度条件下,研究黑色石灰土原土及粗颗粒、微团聚体、单粉粒3种粒径土壤颗粒有机碳矿化速率、有机碳累积矿化量、可矿化有机碳分配比例、有机碳矿化温度系数(Q_(10))和动力学方程参数的差异及温度和粒径对有机碳矿化的交互影响。结果表明,6次筛分所占比例合计达到96.58%,表明试验筛分过程可靠性和重现性良好。粗颗粒有机碳含量最高(80.68 g/kg),分别是原土、微团聚体和单粉粒的1.28倍、1.59倍和1.60倍。培养期内黑色石灰土原土和3种粒径土壤颗粒有机碳矿化速率峰值均出现在第1天,此后迅速下降,并在第8天趋于稳定。15、25、35℃温度下,黑色石灰土原土和不同粒径土壤颗粒有机碳累积矿化量均表现出微团聚体>单粉粒>黑色石灰土原土>粗颗粒的规律,表明微团聚体有机碳在有机碳矿化中的贡献较大,而粗颗粒有机碳贡献较小。土壤可矿化有机碳的分配比例依次排序为微团聚体>单粉粒>黑色石灰土原土>粗颗粒,固碳能力相应排序为粗颗粒>黑色石灰土原土>单粉粒>微团聚体。黑色石灰土原土、粗颗粒、微团聚体、单粉粒的Q_(10)平均值分别为1.12、1.19、1.14、1.25(>25℃)和1.36、1.26、1.22、1.39(<25℃),表明低温下升温比高温时升温更能促进土壤有机碳的矿化。一级动力学方程拟合结果表明,同一培养温度条件下,土壤有机碳潜在矿化量依次排序为微团聚体>单粉粒>黑色石灰土原土>粗颗粒,且均随着培养温度增加而增加。双因素方差分析表明,温度显著影响黑色石灰土原土及不同粒径土壤颗粒有机碳的矿化比例和累积矿化量。To explore the differences and responses of organic carbon mineralization of rendzina and different soil particles under different temperature,and to reinforce the knowledge of soil organic carbon mineralization in Karst area,the differences of organic carbon mineralization rate,accumulative mineralization amount of organic carbon,distribution ratio of minerable organic carbon,temperature coefficient,parameters of the kinetic equations of rendzina and different soil particles under 15,25,35 ℃,and interaction of temperature and size on organic carbon mineralization were studied.The results showed that,the total ratio of 6 screening was 96.58%,which indicates that the screening process was reliable and reproducible.The content of coarse unprotected particulate organic matter was the highest (80.68 g/kg),which was 1.28,1.59,1.60 times higher than that of rendzina,microaggregate fraction,silt-sized fraction,respectively.the value peak of organic carbon mineralization rate of rendzina and different soil particles appeared on the first day of incubation,then decreased rapidly,plateaued on the 8th day of incubation.The accumulative mineralization amount of organic carbon of rendzina and different soil particles under 15,25,35 ℃ ranked as microaggregate fraction>silt-sized fraction>rendzina>coarse unprotected particulate organic matter,which indicated that the contribution of microaggregate fraction to soil organic carbon mineralization was larger and coarse unprotected particulate organic matter was smaller.The distribution ratio of minerable organic carbon ranked as microaggregate fraction>silt-sized fraction>rendzina>coarse unprotected particulate organic matter,then the carbon fixation ability ranked as coarse unprotected particulate organic matter>rendzina>silt-sized fraction>microaggregate fraction accordingly.The mean temperture cofficient values of rendzina,coarse unprotected particulate organic matter,microaggregate fraction and silt-sized fraction were 1.12 , 1.19,1.14,1.25(>25 ℃) respectively,and 1.36,1.

关 键 词：黑色石灰土 不同粒径土壤颗粒 有机碳矿化 温度 

分 类 号：S152.4[农业科学—土壤学]