摘要
以江西省东乡县为研究区,基于土壤有机碳三库(活性、缓性和惰性碳库)一级动力学理论,通过22个土壤样品的实验室呼吸培养实验,计算了各土壤亚类的碳组分含量及占总有机碳的比例,并借助全县229个采样点获得了东乡县的活性、缓性和惰性有机碳的空间分布图。分析结果表明,淹育、潴育、潜育型水稻土和红壤的活性碳含量分别为0.54、0.72、0.72和0.33 g/kg,分别占其总有机碳含量的2.78%、2.83%、2.91%和2.57%;缓性碳含量分别为7.57、9.79、12.34和4.72 g/kg,分别占总有机碳含量的41.09%、45.25%、46.24%和37.12%;惰性碳含量分别为10.36、11.22、13.49和7.67 g/kg,分别占总有机碳含量的60.31%、56.13%、51.92%和50.67%。在空间分布上,活性、缓性和惰性碳含量均呈现由东南向西北减少趋势。分析表明水稻土各亚类活性和缓性碳含量高于红壤,说明水稻土不仅是该地区固碳的主要类型,也是较大的潜在碳排放源。红壤的惰性碳尽管比例最高,但总有机碳含量较低,其土壤固碳能力有待进一步提高。
Taking Dongxiang County of Jiangxi Province as a study area, the contents of active, slow, inert soil organic carbon （SOC） and the corresponding proportions of total SOC were analyzed in the soil subgroups on the basis of the three pool theory of SOC and the culture experiments of soil respiration experiments, and then the distribution contours of three SOC fractions of active, slow and inert SOC were obtained with the proportion data aforementioned and another 229 samples collected by grids throughout Dongxiang County. The results showed that the active SOC contents of the four subgroups of Submergenic, Hydragric, Gleyed paddy soil and red soil were 0.54, 0.72, 0.72 and 0.33 g/kg, and the corresponding proportions in total SOC were 2.78%, 2.83%, 2.91% and 2.57%, respectively. The slow SOC contents of four subgroups were 7.57, 9.79, 12.34 and 4.72 g/kg, and the corresponding proportions in total SOC were 41.09%, 45.25%, 46.24% and 37.12%, respectively. The inert SOC contents of four subgroups were 10.36, 11.22, 13.49 and 7.67 g/kg, and the corresponding proportions were 60.31%, 56.13%, 51.92% and 50.67%, respectively. From the spatial distribution, the contents of active, slow, inert SOC were all decreased from southeast to northwest in Dongxiang County. The contents of active and slow SOC contents of the three subgroups of paddy soil were all higher than that of red soil subgroup. This indicates that the paddy soil is not only the main soil type to carbon sequestration, but also a potential carbon source in hilly red soil region of southern China. The total SOC of red soil is very low, although with higher inert SOC content proportion, and its carbon sequestration ability need to be further improved.
出处
《土壤》
CAS
CSCD
北大核心
2015年第2期318-323,共6页
Soils
基金
国家自然科学基金项目(41201213)
中国科学院战略性先导科技专项项目(XDA05050507)
土壤与农业可持续发展国家重点实验室开放基金项目(0812201231)资助
关键词
土壤有机碳库
土壤类型
土壤有机碳组分
南方红壤丘陵区
Soil organic carbon （SOC） pool
Soil type
SOC fractions
Hilly red soil region in Southem China
作者简介
张忠启（1978-），男，江苏丰县人，博士，副教授，主要从事土壤资源与环境方面的研究。E-mail：zhangzq128@126．com
通讯作者（dshyu@issas．ac．cn）
