摘要
对旱作土壤养分剖面运行与坡面流失的研究结果表明，土壤养分剖面运行表现为明显的季节变化，夏季休闲有利于土壤养分矿化、积累，土壤ＮＯ＿３—Ｎ向下运行距离超过１ｍ。裸露地的土壤养分坡面流失与地面植被覆盖度、肥料施用、降水量及降水强度密切相关；牧草地与作物地每年流失有机质总量为１０７～２０６ｋｇ／ｈａ、Ｎ９～１９ｋｇ／ｈａ、Ｐ＿２Ｏ＿５２２～３８ｋｇ／ｈａ。
Take up with runoff plot experiment and periodically analysed soil nutrient for studies thedry-farming soil ntitrient movement in profile and erosion on sloping field.The results showed that the dry-farming soil nutrient movement in profile exposed distinctly scasonal variation,itmight be divided into 3～5periods annually.The soil NO_3-N leaching depth exceeded lm belowtopsoil and leaching loss occurred in non-crop field.The soil nutrient erosion on sloping field haveclosely relations with different cropping pattern and fetilizer application ways.Annual total ero-sion content of soil nutrient in the grassland for grazzing and crop field were O.M 18～32 ky/ha,N9～19kg/ha,P_2O_5 22～38 kg/ha
出处
《西北农业学报》
CSCD
1994年第1期62-66,共5页
Acta Agriculturae Boreali-occidentalis Sinica
关键词
旱作
土壤养分
黄土高原
土壤侵蚀
Dry-farming soil nutrient
Movement in profile
Erosion on sloping field
