西藏昌都市洛隆县土壤养分状况分析及肥力综合评价

为更好地掌握西藏地区县域尺度地土壤地力水平，本研究有针对性地对西藏昌都市洛隆县的土壤进行了采样分析和土壤肥力评价。采用模糊综合评判法对洛隆县耕地质量进行分等定级，在洛隆县的11个乡（镇）共采集187份土壤样品，测定了土壤pH、土壤有机质、土壤全氮、磷、钾及碱解氮、磷、钾含量，共8项肥力指标。研究结果显示洛隆县土壤pH呈中性至碱性变化，土壤有机质和氮素含量较为丰富。全氮含量高但有效氮含量一般，全钾含量一般但速效钾含量较高。土壤全磷和有效磷含量均较低。总体来看，洛隆县土壤的肥力等级水平总体处于中等偏上，但有1/4的土壤为低肥力水平。后期的农业生产中要注重低肥力水平土壤的地力提升。

Soil Nutrient Status Analysis and Soil Fertility Comprehensive Evaluation in Luolong County of Changdu City in Tibet

To better understand the soil fertility level at the county scale in Tibet, soil sampling analysis and fertility evaluation were carried out in Luolong County of Changdu City in Tibet. The quality of cultivated land in Luolong County was classified by fuzzy comprehensive evaluation method, 187 soil samples were collected in 11 towns of Luolong County. The values of 8 fertility indicators, including soil pH, and the content of soil organic matter, total nitrogen, total phosphorus, total potassium, alkaline hydrolysis nitrogen, available phosphorus and available potassium, were measured. The results showed that soil pH in Luolong County varied from neutral to alkaline. The content of soil organic matter and nitrogen were relatively rich. The total nitrogen content was high but the available nitrogen content was average. The total potassium content was average and the available potassium content was high. The content of soil total phosphorus and available phosphorus were low. Overall, the soil fertility level in Luolong County is above-average, but a quarter of the soil is low in fertility. In future agricultural production, we should pay attention to the improvement of soil fertility of low fertility soil.