摘要
【目的】分析海南芒果园土壤总有机碳和物理组分中的有机碳含量,阐明土壤有机碳特征及其影响因素,为评价海南芒果园土壤碳库提供依据。【方法】运用物理分组方法(包括大小分组、微团粒分离和密度分组)对土壤分组,然后分别测定土壤及各团聚体中的有机碳含量。【结果】海南潮沙泥土和花岗岩赤土地区芒果园土壤总有机碳含量分别在5.5～6.9和3.1～3.7g/kg;物理组分中微团聚体(53～250μm)组分和粘粒与粉粒(<53μm)组分中有机碳含量比相应土壤总有机碳含量高,而大团聚体(>250μm)组分中有机碳含量比相应土壤总有机碳含量低。海南芒果园土壤总有机碳和物理组分中的有机碳含量均很低,53～250μm和<53μm物理组分中有机碳含量随着总有机碳含量的降低而显著降低。【结论】海南芒果园土壤总有机碳和物理组分中有机碳含量均很低,土壤类型对芒果园土壤总有机碳和物理组分中有机碳含量的影响程度远高于土地利用历史的影响。
[Objective]By analyzing the total carbon amount and the content of organic carbon in physical components, the characteristics and impact factors of soil organic carbon（SOC）were illuminated to provide references for evaluating soil car- bon pool in Hainan mango lands. [Method]Using physical fractionation, mango land soil was grouped, and then the content of organic carbon in different aggregate was determined. [Result]The content of soil organic carbon（SOC） in sand soil and granite red soil was 3.1-3.7 and 5.5-6.9 g/kg, respectively. The content of organic carbon in 53-250μm and 〈53 μm fractionations of soil was higher than that of soil total organic carbon, and the content of organic carbon in 〉250 μm fractionations of soil was lower than that of soil total organic carborL The content of total organic carbon and soil organic carbon was low in Hainan mango lands. The content of organic carbon in 53-250 μm and 〈53 μm fractionations of soil fell with the decreasing total organic car- bon. [Conclusion]The content of organic carbon in all soils and those physical fractionations were generally low. The influence of soil group on the content of organic carbon in soils and relative fractionations was greater than land use history.
出处
《南方农业学报》
CAS
CSCD
北大核心
2013年第5期784-787,共4页
Journal of Southern Agriculture
基金
国家自然科学基金项目(41161053)
海南省自然科学基金项目(310074)
关键词
芒果园
土壤
物理分组
有机碳
特征
海南
mango lands
soil
physical fractionation
organic carbon
characteristics
Hainan
