基于TOPSIS-RSR法的三七连作障碍消减效应综合评价

Comprehensive evaluation of reduced obstacles of continuous cropping of Panax notoginseng using TOPSIS-RSR analysis

  • 摘要: 为筛选能有效消减三七连作障碍的技术措施, 本研究选择出苗率(反映出苗状况)、存苗率(反映存苗状况)、地上和地下鲜重、干重及总干重(反映生长状况)等8项指标, 引入TOPSIS法和RSR法, 综合评价了添加土壤改良剂、有机肥、有益微生物等措施及其组合, 共67个处理对三七连作障碍的消减效应。评价结果表明: 土壤消毒剂+有益微生物+有机肥(WY)及土壤消毒剂+土壤改良剂+有益微生物(WX)等措施均可在一定程度上增加连作三七的出苗率和存苗率, 促进三七植株生长, 提高干物质积累, 较好地消减障碍效应; 尤以WY7(4 500 kg·hm-2石灰+22 500 kg·hm-2猪粪)、WY8(4 500 kg·hm-2石灰+450 kg·hm-2金宝贝微生物菌肥)、WX7 (4 500 kg·hm-2石灰+4 500 kg·hm-2膨润土)、WX9(4 500 kg·hm-2石灰+675 kg·hm-2肥士特生物菌肥+4 500 kg·hm-2活性炭粉)处理的效果更为理想; TOPSIS法和RSR法均适用于三七连作障碍消减效应评价, 且表现出很好的一致性。可以看出, TOPSIS法结合RSR法准确地筛选出了WY7、WX9等能够有效消减三七连作障碍的处理; 其他处理排序结果也与盆栽试验结果相吻合, 表明TOPSIS法结合RSR法可增加对各处理评价的准确性, 适用于三七连作障碍有效消减技术措施的筛选。

     

    Abstract: Panax notoginseng, a species of Araliaceae family and panax genus, is a perennial crop cultivated under no-tillage and shaded conditions in warm and damp environments. Because of years of large-scale monoculture of this crop, the ecological environment of P. notoginseng rhizosphere soil has deteriorated due to severe continuous cropping obstacles. Previous studies noted that autotoxins adsorption, soil sterilization, balanced fertilization, soil amendments and other technical measures or the combination of these measures had the potential to improve soil micro-ecological environment to varying degrees which promoted growth or yield of P. notoginseng. However, relevant studies on how to scientifically evaluate the effects of these measures, comprehensively compare the differences among different measures and screen out the most effective mitigation measures were still highly limited. The improved TOPSIS method combined with RSR method was used in this study to screen out the most effective mitigation measures. An experiment was conducted to screen effective technical measures for reducing the obstacles of continuous cropping of P. notoginseng. The eight indicators — including emergence rates (reflecting emergence conditions), survival rates (reflecting survival conditions), and above-ground and belowground fresh weight, dry weight and total dry weight (reflecting growth conditions) of P. notoginseng in 67 treatments — were used in TOPSIS and RSR analyses to comprehensively evaluate the reducing effects of soil amendments, organic compounds, beneficial microorganisms and other technical measures and combinations of these on the obstacles of continuous cropping of P. notoginseng. The evaluation results showed that treatments such as soil disinfectant + beneficial microorganisms + organic fertilizer (WY) and soil disinfectant + soil amendments + beneficial microorganisms (WX) and other measures increased emergence and survival rates of continuously cropped P. notoginseng, and promoted growth of P. notoginseng, increased dry matter accumulation and effectively reduced the effects of the continuous cropping obstacles of P. notoginseng. TOPSIS and RSR analyse results were strongly consistent and therefore suitable for evaluating the reducing effects of on the obstacles of continuous cropping of P. notoginseng. The effective measures reducing the obstacles of continuous cropping of P. notoginseng included WY7 (4 500 kg·hm-2 lime + 22 500 kg·hm-2 pig manure), WX9 (4 500 kg·hm-2 lime + 675 kg·hm-2 bio-fertilizer + 4 500 kg·hm-2 carbon powder), etc. The orders of effects of other treatments were also consistent with the pot experiment, suggesting that TOPSIS analysis combined with RSR analysis increased the accuracy of evaluation and was therefore suitable for screening effective measures reducing the obstacles of continuous cropping of P. notoginseng.

     

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