摘要
[目的]探究宁夏引黄灌区土壤总有机碳与重组有机碳的特征及相互关系,为研究宁夏引黄灌区固碳效应及碳库稳定性提供科学依据。[方法]以宁夏引黄灌区为研究对象,通过实地采样与分析,测定不同土壤类型总有机碳与重组有机碳含量。[结果]土壤类型是影响宁夏引黄灌区土壤有机碳变化的主要因素,经灌溉耕作后,灌溉土壤总有机碳及重组有机碳含量较对照土壤均有所增加,平均增加量分别为2.27和2.02g/kg,增加量随土层深度增加而减小,增加幅度因土壤类型存在差异;重组有机碳与总有机碳存在显著相关关系(p<0.001)。[结论]重组有机碳是总有机碳的重要部分,它与总有机碳之间的相关性随着土层深度的增加而增强,说明灌溉耕作活动及灌溉时间对土壤有机碳具有一定的影响。研究重组有机碳能更好地了解灌区土壤碳库稳定性。
[Objective]Explore the characteristics of soil total organic carbon and heavy fraction organic carbon and their relationship to provide scientific bases for studying the carbon fixation effect and soil stability in Ningxia irrigation zone.[Methods]Taking Ningxia irrigation zone as the study area,the contents of total and heavy fraction organic carbon of 5 different types of soil were measured.[Results]Soil type is the main factor for change of soil organic carbon in the Ningxia irrigation zone.After different durations of irrigation and cultivation,total and heavy fraction organic carbon of irrigated soil were both increased.As compared with the non-irrigation and non-cultivation soil,the average increments were 2.27 and 2.02 g/kg,respectively.The increments decreased with the increase of soil depth,but the amplitudes differed among different soil types.There existed significant correlation between fraction organic carbon and total organic carbon.[Conclusion]Heavy fraction organic carbon is an important part of total organic carbon,its correlation with total organic carbon increase with the increase of soil depth.Irrigation and cultivation activities and irrigation time have influence on the soil organic carbon.Studying the fraction organic carbon can better understand soil carbon and soil stability.
出处
《水土保持通报》
CSCD
2017年第6期85-91,共7页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金青年项目"基于活性系数的碳库稳定性灌淤时间序列演变机制研究"(41501326)
国家自然科学基金项目(0041304
0041309)
2016年青海省自然地理与环境过程重点实验室项目
关键词
总有机碳
重组有机碳
宁夏引黄灌区
total organic carbon
heavy fraction organic carbon
Ningxia irrigation zone
