水土保持学报2012，Vol.26Issue(6)：127-130,4.
苜蓿轮作玉米后土壤养分时空变化特征分析
Analysis of the Spatial-temporal Variation of Soil Nutrient of Alfalfa-maize Rotation
摘要
Abstract
The spatial-temporal variation of soil nutrient was studied under 3-year high-yielding cultivation maize in preceding of 7-growth-year alfalfa.The result showed that organic matter,total nitrogen,total phosphorus of alfalfa-maize rotation were decreased at each growing stage of maize with tillage years prolonged.The decrement of 0-20 cm soil layers was higher,and decrement ranking from much amount to small was organic matter 〉total nitrogen〉 total phosphorus.Because of the influence of high nitrogen application rate,available nitrogen was increased with tillage years prolonged,and its differences were significant between years in different growth stage and different soil layers.Maize yield was decreased with the increasing of continuous maize years,the yield in the second and third year decreased respectively by 9.7% and 13.6%,which indicated that alfalfa's effect on succeeding maize yield-increasing was continuously decreased.关键词
苜蓿-玉米轮作/土壤有机质/氮/磷Key words
alfalfa-maize rotation/soil organic matter/nitrogen/phosphorus分类
农业科技引用本文复制引用
杨恒山,张玉芹,杨升辉,肖利,李国红,李莹莹..苜蓿轮作玉米后土壤养分时空变化特征分析[J].水土保持学报,2012,26(6):127-130,4.基金项目
内蒙古自治区高等学校科学研究项目 （）
内蒙古自然科学基金项目 （）
