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研究治沟造地对土壤水溶性有机碳的影响对于施工技术以及施工后土地利用方式具有重要意义。从延安市南泥湾镇采集土样,测定土样的有机碳、水溶性有机碳以及基本理化指标,采用SPSS中均值T检验分析工程施工与施工后土地利用类型变化对土壤水溶性有机碳的影响。结果表明:(1)治沟造地工程实施前后,耕地土壤平均水溶性有机碳差异显著,工程施工对旱地土壤水溶性有机碳影响最大,增加了52.38%;相对旱地而言,水田对施工效果的响应不明显,增加了13.84%。(2)工程实施后不同土地利用类型平均水溶性有机碳各异。平均水溶性有机碳含量的大小依次为水田>坑塘水面>柳树林>刺柏林>油松林>草地>水浇地>旱地>村庄>沟渠>农田道路,变化范围为0.32~1.01g·kg-1;不同土地利用类型土壤水溶性有机碳与土壤有机碳关系密切,二者呈现显著的正相关关系(R2=0.95,P<0.05)。(3)治沟造地工程中柳树、刺柏、油松栽植后,土壤水溶性有机碳分别提高了114.28%、85.71%、77.14%。
Studying the impact of land-cutting on soil water-soluble organic carbon is of great significance to construction technology and land use pattern after construction. The soil samples were collected from Nanniwan Town, Yan’an City. The organic carbon and water-soluble organic carbon of soil samples were measured and the basic physical and chemical indexes were determined. The changes of soil water-soluble organic carbon influences. The results showed that: (1) Before and after the project of trench-making and land-building, the average difference of soil dissolved organic carbon in cultivated land was significant, and the construction had the greatest effect on the water-soluble organic carbon in dry land, increasing by 52.38% The response is not obvious, an increase of 13.84%. (2) Average water-soluble organic carbon varies with land use types after project implementation. The average water-soluble organic carbon content in the order of paddy field> pit pond> willow forest> coniferous forest> Pinus tabulaeformis forest> grassland> irrigated field> dry land> village> ditch> farmland road varied from 0.32 to 1.01 g · kg- 1. There is a significant positive correlation between soil organic carbon (SOC) and soil organic carbon under different land use types (R2 = 0.95, P <0.05). (3) Soil water-soluble organic carbon increased by 114.28%, 85.71% and 77.14% respectively after planting willows, juniper and Pinus tabulaeformis in the trench-making project.