Constructing and Spatially Differentiating Soil Quality Indices in Qiqihar's Typical Black Soil Zone: A Case Study of Tailai, Longjiang, and Gannan Counties, China

文献类型： 外文期刊

第一作者： Wang, Lei

作者： Wang, Lei;Pang, Min;Wang, Na;Xie, Jianzhi;Wang, Lei;Wei, Dan;An, Zhizhuang;Jin, Liang

作者机构：

关键词： soil quality index; minimum dataset; soil nutrients; black soil

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2025 年 15 卷 4 期

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收录情况： SCI

摘要： Black soils in Qiqihar City are comprised primarily of black soil. They have been extensively exploited for agriculture. To investigate the spatial distribution of soils in this region, we analyze 72 samples collected from Tailai, Longjiang, and Gannan counties. A soil quality index (SQI) based on a subset of measured soil indicators is constructed to comprehensively evaluate black soil quality. We report an average soil bulk density in these black soil areas of 1.42 g/cm(3), indicating relatively high compaction and density. The average soil moisture content (19%) is relatively low. In some areas, soil electrical conductivity reaches 2.92 mu S/cm, indicating mild salinization (<4 mu S/cm). Overall soil nutrient levels are relatively high, but in some areas they are poor. Principal components and correlation analyses identify five of nine measured indicators (soil bulk density, pH, moisture, nitrate nitrogen, and organic matter contents) that adequately characterize soil quality. The SQI values reveal soil quality to decrease along a north-south gradient, sand to be highest in Gannan County and lowest in Tailai County. Overall, black soil quality in Qiqihar City is relatively low. These results provide a scientific foundation and data support for soil restoration and ecological construction efforts in these areas.

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