黑土区设施栽培土壤团聚体和有机碳组分变化特征

Characteristics of Soil Aggregates and Organic Carbon Fractions in Protected Cultivation in Black Soil Area

以东北黑土区庆安、绥陵、明水、海伦、望奎、绥化北林区、哈尔滨等地区的设施栽培地区土壤为研究对象,通过对设施栽培土壤进行采样和分析,系统研究了设施农业土地利用方式下土壤团聚体粒径分布特征及其有机碳含量、各粒径团聚体的有机碳对土壤总有机碳贡献率。结果表明:从不同粒径来看,团聚体有机碳主要分布在粒径>1 mm的水稳性大团聚体范围内,而粒径<0.106 mm的团聚体有机碳含量最低。粒径在0.5~1.0 mm的团聚体对有机碳的贡献率达到23%,粒径在0.25~0.50 mm的团聚体对有机碳的贡献率最大,达到26%。对不同栽培年限下各粒径团聚体的有机碳含量进行具体分析可知,栽培年限为0~5年和>15年时,粒径>5.0 mm的团聚体对土壤总有机碳贡献率最大。

In the black soil region of Northeast China including Qing＇ an, Suiling, Mingshui, Hailun, Wangkui, Suihua, Harbin, where soils in protected cultivation area were taken as the research objects, based on the soil cultivation in these areas were sampled and analyzed, the system of agriculture land use under the content of soil aggregates and organic distribution characteristics carbon, organic carbon in various aggregates on soil organic carbon contribution rate. The results showed that the grain size from different point of view, organic carbon was mainly distributed in the ~ 1.0 mm water stable aggregates range. However, the organic carbon content of ~ 0. 106 mm was relatively low. The contribution rate of particle size of 0. 25--0.50 mm to organic carbon was the largest,reaching 26%, with the particle size of 0. 5--1.0 mm aggregates in organic carbon contribution rate of 23%. Specific analysis on the contents of particulate organic carbon under different planting conditions. The contribution rate of 〉5.0 mm particle size to organic carbon was the largest, when the cultivation time was 0--5 years and 〉15 years.