摘要
以三江平原分布最广泛的两种自然沼泽湿地(毛果苔草沼泽和小叶章草甸)以及不同利用类型土地为研究对象,探讨了土地利用变化对三江平原沼泽湿地土壤碳含量的影响。结果表明,沼泽湿地土壤中碳含量主要受地表积水环境的控制,表现为常年积水的毛果苔草沼泽高于季节性积水的小叶章草甸,毛果苔草沼泽土壤总碳(TC)、有机碳(SOC)、无机碳(SIC)及可溶性有机碳(DOC)含量分别为(258.4±81.9)g/kg,(203.7±62.4)g/kg,(54.7±19.4)g/kg和(4.8±0.85)g/kg,小叶章草甸土壤则分别为(99.4±24.2)g/kg,(81.4±24.5)g/kg,(17.9±9.8)g/kg和(2.4±0.27)g/kg。垦殖导致沼泽湿地土壤碳含量显著降低,土壤TC及SOC含量随开垦年限的增加而递减,并与垦殖年限呈极显著负相关关系。沼泽湿地退化后,土壤碳含量降低,小叶章草甸退化为小叶章-杂类草草甸后土壤TC,SOC,SIC及DOC分别减少了71%,72%,67%和76%,毛果苔草沼泽退化为灌丛-杂类草草甸后则分别减少了69%,65%,83%和60%。"退耕还湿"能提高土壤中的碳含量,但增加速率较慢。土壤pH值是影响土壤碳含量的一个重要因素。
Land use has been changed drastically under the influence of human activity since the middle of the twentieth century,and it affects soil carbon contents importantly.The effects of land use change on carbon contents in marsh soils in Sanjiang Plain were studied by selecting two typical marshes： Carex lasiocarpa marsh and Deyeuxia angustifolia marsh.The results indicated that soil carbon contents were mostly controlled by water condition and soil carbon contents in Carex lasiocarpa marsh（long-waterlogged marsh） were higher than in Deyeuxia angustifolia marsh（short-waterlogged marsh）.Total carbon（TC）,soil organic carbon（SOC）,soil inorganic carbon（SIC） and dissolved organic carbon（DOC） in Carex lasiocarpa marsh soil were（258.4±81.9）g/kg,（203.7±62.4）g/kg,（54.7±19.4）g/kg,（4.8±0.85）g/kg and which in Deyeuxia angustifolia marsh soil were（99.4±24.2）g/kg,（81.4±24.5）g/kg,（17.9±9.8）g/kg和（2.4±0.27）g/kg,respectively.Reclamation led in soil carbon contents decreased remarkably.TC and SOC were both negatively correlative with tillage years.Degradation of marsh resulted in the reduction of soil carbon contents.Marsh restoration increased soil carbon contents,but the rates of TC and SOC were low.Soil pH was an important factors affecting soil carbon.
出处
《水土保持学报》
CSCD
北大核心
2009年第5期248-252,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(40805050)
教育部博士点新教师基金(200806351014)
重庆市科技计划项目(CSTC
2009AC7011)
