• ISSN 1008-505X
  • CN 11-3996/S
兰翔, 王婷, 杨春玲, 胡承孝, 谭启玲, 孙学成. 不同施磷量对蔬菜地土壤硝态氮淋失的影响[J]. 植物营养与肥料学报, 2016, 22(4): 958-964. DOI: 10.11674/zwyf.15245
引用本文: 兰翔, 王婷, 杨春玲, 胡承孝, 谭启玲, 孙学成. 不同施磷量对蔬菜地土壤硝态氮淋失的影响[J]. 植物营养与肥料学报, 2016, 22(4): 958-964. DOI: 10.11674/zwyf.15245
LAN Xiang, WANG Ting, YANG Chun-ling, HU Cheng-xiao, TAN Qi-ling, SUN Xue-cheng. Effect of different phosphorus application rates on soil nitrate leaching in vegetable fields[J]. Journal of Plant Nutrition and Fertilizers, 2016, 22(4): 958-964. DOI: 10.11674/zwyf.15245
Citation: LAN Xiang, WANG Ting, YANG Chun-ling, HU Cheng-xiao, TAN Qi-ling, SUN Xue-cheng. Effect of different phosphorus application rates on soil nitrate leaching in vegetable fields[J]. Journal of Plant Nutrition and Fertilizers, 2016, 22(4): 958-964. DOI: 10.11674/zwyf.15245

不同施磷量对蔬菜地土壤硝态氮淋失的影响

Effect of different phosphorus application rates on soil nitrate leaching in vegetable fields

  • 摘要: 【目的】在两种蔬菜地土壤上研究不同磷肥施用量对土壤硝态氮淋失的影响,为武汉城郊蔬菜合理施用磷肥和安全生产提供理论依据。【方法】利用大型原状土柱渗漏装置,2种实验土壤(粉质粘土和粉质粘壤土)均为武汉城郊典型蔬菜土壤,分别采自华中农业大学校内蔬菜基地和湖北新洲。试验期间共种植了四种蔬菜(小白菜、 辣椒、 苋菜及萝卜)。试验设置了4个P2O5水平处理(0、 125、 250、 375 kg/hm2),氮肥施用量均为N 750 kg/hm2,钾肥施用量均为K2O 500 kg/hm2。试验期间年降雨量为1043.0 mm,各土柱总灌溉量为120.1 L。秋冬季每15天、 春夏季每10天收集一次淋洗液,另外根据天气和降雨情况适当调节,每次收集淋洗液时记录淋洗液体积并测定淋洗液硝态氮浓度。在每季蔬菜生长成熟后将蔬菜收获称重,烘干后测定蔬菜中氮素含量。【结果】1)与不施磷肥相比,施用磷肥显著增加了两种土壤上小白菜、 苋菜、 萝卜产量以及四季蔬菜总产量,其产量随磷肥施用量增加而增加或显著增加,在磷肥施用量最大时产量达到最大值。粉质粘土上的产量显著低于粉质粘壤土上的产量,粉质粘壤土总产量约是粉质粘土总产量的1.63~2.36倍。2)施用磷肥显著增加了小白菜、 苋菜氮素吸收累积量以及四季蔬菜总吸收累积量,且两种土壤上总氮素吸收累积量均在磷肥施用量最大时达到最大值。粉质粘壤土上氮素总吸收累计量显著高于粉质粘土上氮素总吸收累积量。3)磷肥水平对土壤总渗漏液体积并无显著影响(粉质粘壤土P2O5 125 kg/hm2处理除外),粉质粘土渗漏水量显著大于粉质粘壤土。4)施用磷肥降低或显著降低土壤淋失液硝态氮浓度(粉质粘土苋菜季除外),随着磷肥施用量的增加硝态氮淋失浓度不断降低,4季蔬菜平均淋失浓度最大降低了38.6%(粉质粘土)和28.8%(粉质粘壤土)。5)磷肥施用显著降低了两种土壤上硝态氮淋失量(苋菜季除外),且在粉质粘土上随着磷肥施用量的增加硝态氮淋失量不断降低,而在粉质粘壤土上硝态氮淋失量先降低后上升。粉质粘土硝态氮淋失量显著大于粉质粘壤土,磷肥施用降低硝态氮淋失量分别达到达26.4%~33.7%和23.5%~39.9%。【结论】磷肥施用增加了蔬菜产量和作物氮素吸收累积量,从而显著降低了两种土壤上硝态氮的淋失; 土壤质地对硝态氮淋失有较大影响,质地较轻的粉质粘壤土硝态氮淋失显著小于质地较重的粉质粘土; 粉质粘壤土上施用P2O5量为250 kg/hm2时能提高产量同时减少硝态氮淋失,而粉质粘土上施用P2O5量为375 kg/hm2时能获得较大产量和较少硝态氮淋失量。

     

    Abstract: 【Objectives】 The effect of different phosphorus application rates on nitrate leaching was studied in two vegetable soils of Wuhan in order to provide theoretical evidence for optimum phosphate fertilization practice and to secure the safety of vegetables.【Methods】 The experiment was carried out on undisturbed soil core with two soils (silty clay and silty clay loam) collected from vegetable fields of Huazhong Agricultural University and Xinzhou Hubei, respectively. Both soils were common vegetable soil in Wuhan suburb areas, and four different vegetable species (Chinese cabbage, pepper, amaranth and radish) wereselected and planted under continuous cropping according to their seasonal adaptability. Four phosphorus (P) application rates as P2O5 (0, 125, 250 and 375 kg/hm2) were applied, and the application rates of nitrogen (N) and potassium (K) in all treatments were N 750 kg/hm2 and K2O 500 kg/hm2, respectively. Precipitation was 1043.0 mm per year and the irrigation volume was 120.1 L per year during the experimental period. Leachate was normally collected every 15 days in autumn and winter, and every 10 days in spring and summer, while it was also collected depending on the precipitation. Volumes were recorded and NO-3 concentration was determined in the leachate. After harvesting, vegetables were weighed and total N concentration in vegetables (dry weight basis) was determined. 【Results】 1) Phosphorus application significantly increased the yield of all four vegetables, compared with no P application. Yield on silty clay was significantly lower than that on silty clay loam, which was about 1.63-2.36 times different. 2) Nitrogen uptake in Chinese cabbage, amaranth and total N accumulation of four vegetables increased significantly with increasing of P application rate. N accumulation in silty clay loam was markedly higher than that in silty clay. 3) Different P application rates did not affect the total volume of leachate (except 125 kg/hm2 treatment in silty clay loam) with higher amount on silty clay than that on silty clay loam. 4) Phosphorus application decreased or significantly decreased NO-3 concentration in leachate (except amaranth on silty clay) with the effect increased with increasing P application rate. On average, NO-3 concentration of four vegetables decreased by 38.6% (silty clay) and 28.85% (silty clay loam), respectively. 5) Total amount of nitrate leaching for all vegetables (except amaranth) decreased with P application. It decreased with increasing P application rate on silty clay, but on silty clay loam, it dropped firstly and then increased. Total amount of leached nitrate was higher on silty clay than on silty clay loam, it was decreased by 26.4%-33.7% and 23.5%-39.9% with P application in the two soils, respectively. 【Conclusions】 Phosphorus application increases vegetables production and N accumulation, thus decreasing the amount of NO-3 leaching in both two soils. Soil texture is an important factor which affects NO-3 leaching in which the amount of NO-3 leaching is remarkably lower in silty clay loam than in silty clay. It is concluded that the application of P2O5 250 kg/hm2 in silty clay loam can increase vegetable yield and decrease NO-3 leaching, while in silty clay soil P2O5 375 kg/hm2 is the recommended application rate.

     

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