种植绿肥对滨海盐渍土养分及盐分动态变化的影响

发布时间：2018-12-21 17:19

【摘要】：【目的】明确不同绿肥作物对土壤理化性状的影响,为滨海盐渍土改良利用提供理论依据。【方法】通过田间种植豆科绿肥田菁、草木樨,分析了绿肥生长季滨海盐渍土容重、孔隙度、p H、养分、有机质及盐离子总量的动态变化。【结果】与种植前相比,一个生长季后,种植田菁、草木樨土壤容重减轻6.72%~8.82%,孔隙度增加6.90%~9.43%;土壤有机质、有效氮含量分别较种植前增加4.56%~6.80%和9.49%~10.7%,且含量最高的是1月和3月;土壤速效磷含量降低,降幅范围为2.17%~35.6%;0~20 cm土层p H降低,可溶性盐离子总量及氯离子含量分别由种植前的3.36~5.92和1.12~1.89 g/kg降低到种植后的1.44~2.08和0.178~0.247 g/kg,脱盐效果显著。【结论】种植豆科绿肥田菁、草木樨可明显改善土壤物理结构,降低土壤p H与盐分水平,提高土壤有机质与有效氮含量。
[Abstract]:[objective] to clarify the effects of different green manure crops on soil physical and chemical properties, and to provide theoretical basis for the improvement and utilization of littoral saline soil. [methods] the bulk density of littoral saline soil in green manure growing season was analyzed by planting legume green manure Sesbania and sweet clover in the field. Dynamic changes of, p H, nutrients, organic matter and total salt ions. [results] after a growing season, soil bulk density of Sesbania and sweet clover decreased by 6.72% and 8.82%, compared with that before planting. The porosity increased 6.90% and 9.43%; The content of soil organic matter and available nitrogen increased by 4.56% 6.80% and 9.4910.7%, respectively, and the content of soil available phosphorus was the highest in January and March, and the content of soil available phosphorus decreased in the range of 2.17 ~ 35.60.The content of soil organic matter and available nitrogen increased by 4.56% and 9.49% respectively in January and March, respectively. In 0 ~ 20 cm soil layer, total soluble salt ion and chloride ion content decreased from 3.36 ~ 5.92 and 1.12 ~ 1.89 g/kg to 1.44 ~ 2.08 and 0.178 ~ 0.247 g / kg, respectively. [conclusion] planting legume green manure Sesbania and sweet clover can obviously improve soil physical structure, decrease soil pH and salt content, and increase soil organic matter and available nitrogen content.
【作者单位】：江苏沿海地区农业科学研究所;
【基金】：江苏省农业科技自主创新资金(CX(15)1005) 江苏沿海地区农科所所基金项目(YHS201501) 农业部沿海盐碱地科学观测实验站开放课题(YHS201607)
【分类号】：S156.42;S55

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