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对实施种养结合循环利用模式的稻田—油菜土壤养分进行测定,为生态环境效益评价和推广提供依据.试验区40.5hm2,对照区20.5hm2.网格法取点,GPS+MAPGIS定位,试验、对照区样点数分别为47、31个.采集0-20cm耕层土壤,风干过筛,采用电位法测定pH,低温外热重铬酸钾氧化-比色法测定有机质(OM),半微量开氏法测定全氮(TN),碱解扩散法测定碱解氮(HN),氢氟酸-高氯酸-硝酸消煮-ICP法测定全磷(TP)和全钾(TK),氟化铵-盐酸提取-钼锑抗比色法测定有效磷(AP),冷HNO3溶液浸提-ICP法测定有效钾(AK).结果表明,试验区土壤pH无显著变化,而OM、TN、HN、TP、AP、TK、AK含量,增幅分别达到65%、13%、34%、24%、95%、14%、47%,其中OM、HN、AP含量升高极显著(P<0.01),TN、TP、TK、AK含量升高显著(P<0.05).结论:实施种养结合循环利用模式3年后,土壤各养分含量有不同程度增加,增幅从13%至95%不等.
The soil nutrient of paddy field-rapeseed with combination of planting, breeding and recycle was determined to provide the basis for evaluation and popularization of eco-environmental benefits.The experimental area was 40.5hm2 and the control area was 20.5hm2. The number of samples in the control plot were 47 and 31 respectively.The soils of 0-20 cm layer were collected and air-dried and sieved.The pH value was measured by potentiometric method.The content of organic matter (OM), semi-micro-scale Determination of Total Nitrogen (TN) by Alkaline Method, Alkaline Hydrolysis (HN) and Hydrofluoric Acid - Perchloric Acid - Nitric Acid Decontamination - ICP Determination of Total Phosphorus (TP) and Total K Ammonium-hydrochloric acid extraction-molybdenum-antimony colorimetry was used to determine available phosphorus (AP), and cold HNO3 solution was used for the extraction of effective potassium (AK). The results showed that there was no significant change in soil pH, The content of TP, AP, TK and AK increased by 65%, 13%, 34%, 24%, 95%, 14% and 47% (P <0.05) .Conclusion: After three years of planting and breeding combined with recycle mode, the nutrient content of soil increased in varying degrees, ranging from 13% to 95%.