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    不同复垦土地植被类型对半干旱矿区土壤性质的影响及质量评价

    Effects of different vegetation types on soil properties and quality assessment in semi-arid mining areas

    • 摘要: 对矿产资源开发利用往往造成土壤资源的破坏,而土地复垦是矿区生态修复的关键措施。为探究不同复垦土地植被类型对半干旱矿区土壤性质的影响,以神东矿区煤田腹地露天开采区的裸地、耕地、草地及林地土壤为研究对象,测定土壤粒径组成、物理性质、养分状况及微生物性质指标,在显著性差异分析基础上,运用熵权TOPSIS法对土壤质量进行综合评价。结果如下:1)矿区复垦后,耕地、草地及林地>0.1 mm的砂粒含量较裸地显著减少(P<0.05,下同),而粉粒与黏粒含量显著增加,其中林地粉粒含量最高,对粒径组成的改善效果显著。2)物理性质方面,耕地与草地较裸地孔隙度显著减小,容重显著增大,而林地相反;林地较裸地分形维数显著增加,饱和导水率显著下降,其土壤含水率显著大于耕地与草地。3)各复垦土地植被类型较裸地均显著提升了土壤养分含量,其中耕地有机质、碱解氮及速效钾含量最高,而林地速效磷含量显著高于其他类型。4)除蛋白酶活性外,耕地、草地及林地的土壤微生物指标较裸地均显著提高;林地土壤呼吸强度、微生物碳、过氧化氢酶活性最高,显著大于耕地与草地;草地与林地磷酸酶活性显著大于耕地;而对脲酶活性的提升无显著差异。5)土壤质量综合评价结果为林地>耕地>草地>裸地,其中林地和耕地复垦类型土壤质量表现良好,可结合当地需求作为半干旱矿区土地复垦与生态重建的优选类型。

       

      Abstract: Background Resource exploitation and utilization in mining areas often result in the destruction of soil resources, while land reclamation is a key measure for ecological restoration in mining areas.Method To explore the effects of different reclamation types on soil properties in a semi-arid mining area, soils from bare land, cultivated land, grass land, and forest land in the open-pit mining zone of the Shendong coalfield hinterland were selected as research objects. Soil particle size composition, physical properties, nutrient status, and microbial properties were determined. Based on the analysis of significant differences, the entropy-weighted TOPSIS method was applied to comprehensively evaluate soil quality.Result 1)After reclamation in the mining area, the content of sand particles larger than 0.1 mm in cultivated land, grass land, and forest land significantly decreased compared to bare land (P < 0.05, hereinafter the same), while the contents of silt and clay significantly increased. Among them, forest land had the highest silt content, showing a better improvement effect on particle size composition. 2)In terms of soil physical properties, compared to bare land, the porosity of cultivated land and grass land significantly decreased and bulk density significantly increased, while the opposite was observed in woodland; compared to bare land, the fractal dimension of forest land significantly increased and saturated hydraulic conductivity significantly decreased, and its soil water content was significantly higher than that of cultivated land Grass land. 3)All the vegetation types on the reclaimed land significantly increased the soil nutrient content compared to the bare land. Among them, the cultivated land had the highest content of organic matter, alkali-hydrolyzable nitrogen and available potassium, while the forest land had a significantly higher content of available phosphorus than the other types. 4)than those in bare land; the soil respiration intensity, microbial carbon and peroxidase activity in forest land were the highest, significantly greater than those in cultivated land and grass land; the phosphatase activity in grass land and forest land was significantly higher than that in cultivated land; while there was no significant difference in the elevation of urease activity. 5)Through the comprehensive evaluation of soil quality, the results showed forest land > cultivated land > grass land > bare land, all of which were superior to bare land. Conclusion In this study, the soil quality of forest land and cultivated land reclamation types performed well, and they can be recommended as preferred types for land reclamation and ecological reconstruction in semi-arid mining areas in combination with local needs.

       

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