2011−2020年汕头市耕地质量时空演变特征与对策分析

    Spatio-temporal Evolution Characteristics and Countermeasure Analysis of Cultivated Land Quality in Shantou City During 2011−2020

    • 摘要: 为揭示汕头市耕地土壤质量的时空演变特征,识别耕地土壤养分失衡与酸化等核心问题,为区域耕地质量提升与综合治理提供参考依据。基于汕头市9个代表性耕地质量监测点2011−2020年的连续10年监测数据,运用年际变异数据统计及GIS空间分析技术,对土壤有机质、全氮、有效磷、速效钾含量及pH值的时空演变进行系统分析。结果表明:2011−2020年,汕头市耕地土壤有机质含量平均值从21.95 g·kg−1提高到28.67 g·kg−1,提升30.62%;土壤pH值整体呈弱酸性,10年间平均值保持在4.80~6.01,整体变化不大,但部分地区酸化趋势明显;全氮含量平均值从1.28 g·kg−1提高到1.53 g·kg−1,提升19.53%;速效钾含量平均值从75.11 mg·kg−1增加到108.22 mg·kg−1,提升44.08%;土壤有效磷含量长期处于高位震荡状态,平均值维持在30.94~78.97 mg·kg−1,远高于适宜水平,存在过量累积问题。据此,提出实施分区分类的耕地培肥管理模式,即在全域提升有机质的基础上,重点推进有效磷减量控蓄与局部酸化治理,优化施肥结构,并完善长期监测网络,以支撑耕地质量的动态管理与精准调控。

       

      Abstract: The study aimed to reveal the spatial and temporal evolution characteristics of cultivated land soil quality in Shantou City, identify the core problems such as soil nutrient imbalance and acidification of cultivated land, and provide reference for the regional cultivated land quality improvement and comprehensive management. Based on the monitoring data of 9 representative cultivated land quality monitoring points in Shantou City from 2011 to 2020, the spatial and temporal evolution of soil organic matter, total nitrogen, available phosphorus, available potassium and pH value were systematically analyzed by using the inter-annual variation data statistics and GIS spatial analysis technology. The results showed that the average soil organic matter content of cultivated land in Shantou increased from 21.95 g·kg−1 to 28.67 g·kg−1 in 2011−2020, an increase of 30.62%. The soil pH value was weakly acidic as a whole, and the average value remained at 4.80~6.01 during the 10 years. The overall change was not significant, but the acidification trend was obvious in some areas. The average total nitrogen content increased from 1.28 g·kg−1 to 1.53 g·kg−1, an increase of 19.53%. The average content of available potassium increased from 75.11 mg·kg−1 to 108.22 mg·kg−1, an increase of 44.08%. The soil available phosphorus content was in a state of high fluctuation for a long time, and the average value was maintained at 30.94~78.97 mg·kg−1, which was much higher than the appropriate level, and there was a problem of excessive accumulation. Based on this, the management model of cultivated land fertilization by zoning and classification was proposed, that was, on the basis of improving organic matter in the whole region, the effective phosphorus reduction and storage control and local acidification treatment should be promoted, the fertilization structure should be optimized, and the long-term monitoring network should be improved, thus to support the dynamic management and precise regulation of cultivated land quality.

       

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