摘要
研究温度和水分对黑土有机碳矿化的影响,对揭示气候变化背景下黑土有机碳矿化的规律及其机理具有重要意义。通过280 d的室内培养试验,研究了2个不同有机碳含量的黑土在不同温度和水分交互作用下,其总有机碳和轻、重组有机碳含量的变化以及团聚体组成和总有机碳在各粒级团聚体中的分布特点。结果表明:2个黑土总有机碳及轻、重组有机碳含量,在含水量5%~50%的条件下,均随温度的升高而减少;在温度为10~30℃时,高有机碳土壤在含水量29%(相当于田间持水量约70%)时、低有机碳土壤在含水量23%(相当于田间持水量的60%~70%)时,其总有机碳及轻、重组有机碳含量降到最低值。在矿化的总有机碳中,轻组的矿化率高于重组,高有机碳土壤总有机碳及轻、重组有机碳矿化率大于低有机碳土壤,高有机碳土壤对温度和水分变化的响应比低有机碳土壤更为敏感。土壤在不同温度和水分条件下培养280 d后,>0.25 mm大团聚体均有向<0.25 mm微团聚体转化趋势。在温度为30℃时,高有机碳土壤含水量为29%时、低有机碳土壤含水量为23%时,其大团聚体的有机碳矿化量最大。
The study of the effects of temperature and moisture on mineralization of black soil organic carbon is of great significance to reveal the law and mechanism of organic carbon mineralization in black soil under the background of climate change.Through a 280 d indoor culture experiment,changes of the total organic carbon and light and recombined organic carbon content,composition of aggregates and distribution characteristics of the total organic carbon in different grade aggregates were studied in two black soils with different organic carbon content under different temperature and moisture interactions.The results showed that the total organic carbon and light and recombined organic carbon content of the two black soils decreased with the increase of temperature when water content was 5%-50%;At 10-30℃,the total organic carbon and light and heavy organic carbon content of high organic carbon soil decreased to the minimum value when water content of high organic carbon soil was 29%(equivalent to about 70%of field water capacity)and water content of low organic carbon soil was 23%(equivalent to 60%-70%of field water capacity).In the mineralized total organic carbon,the mineralization ratio of light group was higher than that of heavy group,the mineralization rate of the total organic carbon and light and heavy organic carbon in high organic carbon soil was higher than that in low organic carbon soil,and the response of high organic carbon soil to temperature and water change was more sensitive than that of low organic carbon soil.After 280 d of incubation under different temperature and moisture conditions,the macro aggregates>0.25 mm tended to transform into<0.25 mm micro aggregates.When temperature was 30℃,soil water content of high organic carbon and 29%and that of low organic carbon soil was 23%,and the mineralization of organic carbon in large aggregates was the largest.
作者
刘士丹
卢敬坤
胡宁
王鸿斌
赵兰坡
LIU Shidan;LU Jingkun;HU Ning;WANG Hongbin;ZHAO Lanpo(College of Resources and Environment,Jilin Agricultural University,Changchun 130118,China)
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2020年第5期552-560,共9页
Journal of Jilin Agricultural University
基金
公益性行业(农业)科研专项(2015-3116-06)
吉林省科技发展计划项目(20130204050SF)
关键词
黑土
温度
水分
有机碳
矿化率
团聚体
black soil
temperature
moisture
organic carbon
mineralization rate
aggregate
