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Position: Home > Articles > Spatial Distribution of Rapid Available Potassium (RAK) in Soils on Typical Slopes of Black Soil of Northeastern China Soils 2014 (2) 218-224

典型黑土区不同坡位剖面土壤速效钾空间分布规律研究

作  者:
张少良;张兴义;刘晓冰;宁玉翠;张志强
单  位:
中国科学院东北地理与农业生态研究所;中国科学院黑龙江农业现代化研究所;东北农业大学资源与环境学院中国科学院东北地理与农业生态研究所;东北农业大学资源与环境学院
关键词:
黑土;样带;剖面;速效磷;土壤侵蚀
摘  要:
本研究系统地揭示了典型黑土区典型样带多个剖面0~60 cm土壤速效钾横向和纵向分布规律。研究结果表明:研究区各样带土壤速效钾含量处于97.5~395.5 mg/kg之间,各样带土壤速效钾平均值一般是从表土层0~20 cm向20~40 cm处减小,然后逐渐向50~60 cm处增大。其变异系数和极差一般从表土层0~20 cm向50~60 cm处逐渐降低。土壤速效钾总体沿坡向向下呈下降趋势,同一土带各土层相隔越近速效钾沿坡向变化趋势越接近。各样带土壤剖面0~60 cm土层速效钾沿坡向变异均是从坡顶变异程度最大(CV=23%~28%),至坡肩变异程度相对较小(CV=12%~14%)。剖面土壤速效钾变化趋势整体上从0~20 cm向深土层先逐渐减少而后增加,通常在20~40 cm出现最低值。
译  名:
Spatial Distribution of Rapid Available Potassium (RAK) in Soils on Typical Slopes of Black Soil of Northeastern China
作  者:
ZHANG Shao-liang;ZHANG Xing-yi;LIU Xiao-bing;NING Yu-cui;ZHANG Zhi-qiang;College of Resources and Environment,Northeast Agricultural University;Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences;
关键词:
Black soil(Mollisol),Sample transect,Soil profile,Soil available potassium,Soil erosion
摘  要:
Rapid available potassium(RAK) in black soil(Mollisol) of 0–60 cm depth was measured to analyze its dynamics systematically in horizontally and vertically.The results indicated:RAK ranged from 97.5 to 395.5 mg/kg,decreased from horizon 0–20 cm to 20–40 cm,and then increased to 50–60 cm.Generally,variable coefficient(CV) and its range decreased from surface to deep.RAK decreased from top slope to down slope,and the dynamics were similar when horizons were closer.CV in horizon of 0–60 cm was higher in top slope(CV=23%–28%) and lower in shoulder slope(CV=12%–14%).RAK decreased at beginning,then increased and was lowest at horizon 20–40 cm.

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