不同耕作制度下稻田土壤有机碳分布特征分析——以海南省中部地区为例

Analysis of the Distribution Characteristics of Paddy Soil Organic Carbon under Different Tillage Systems:Take the Central Area of Hainan Province as an Example

为了解耕作制度对热带地区稻田土壤有机碳分布的影响,选择海南岛中部地区4种不同耕作制度下的稻田(一熟制、二熟制、三熟制、撂荒地)为研究对象,对比分析不同类型稻田土壤有机碳的分布特征,探究影响其分布变化的主要因素。结果表明:4种耕作制度下稻田表层(0~30cm)土壤有机碳含量呈现三熟制>二熟制>撂荒地>一熟制的分布规律,4种耕作制度下稻田的土壤有机碳含量随土层加深而降低;撂荒地土壤有机碳含量与土壤pH值极显著负相关;一熟制土壤有机碳含量与土壤中粉粒占比显著正相关,与砂粒占比显著负相关,且不同耕作制度通过影响土壤理化性质进而影响土壤有机碳的分布。

In order to understand the impact of tillage systems on the distribution of organic carbon in paddy soils in tropical regions,rice fields under four different tillage systems(one-cropping system,two-cropping system,three-cropping system and abandoned land)in central Hainan island were selected as the research objects.The distribution characteristics of soil organic carbon in different types of paddy soil were analyzed,and the main factors that affect its distribution were explored.The results showed that the soil organic carbon content in the surface layer(0~30 cm)of the paddy field under the four tillage systems showed a distribution rule of three crops>two crops>abandoned land>one crop.In the vertical direction,the soil organic carbon content of the four paddy fields is in a trend of decreasing with the deepening of the soil layer.Soil organic carbon content and soil pH of abandoned land are extremely significantly negatively correlated.Soil organic carbon of one-crop rice field soil is significantly positively correlated with the proportion of silt in the soil,and negatively correlated with the proportion of sand particles.And different tillage systems affect the distribution of soil organic carbon by affecting the physical and chemical properties of the soil.