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当前位置: 首页 > 文章 > 黄土高原半湿润区苜蓿草地土壤氮素消耗特征研究 植物营养与肥料学报 2008,14 (1) 84-89
Position: Home > Articles > Soil nitrogen consumption characteristics of alfalfa grassland in the semi-humid areas of the Loess Plateau Journal of Plant Nutrition and Fertilizers 2008,14 (1) 84-89

黄土高原半湿润区苜蓿草地土壤氮素消耗特征研究

作  者：
万素梅;韩清芳;胡守林;贾志宽;杨宝平
单  位：
西北农林科技大学干旱半干旱农业研究中心;塔里木大学植物科技学院
关键词：
土壤有机质;土壤全氮;碱解氮;苜蓿草地;半湿润区
摘  要：
本文研究了黄土高原地区生长年限分别为4 a、6 a、10 a、12 a、18 a及26 a苜蓿草地土壤氮素的变化特征。结果表明,在0—1000 cm土层,不同生长年限苜蓿草地土壤全氮与碱解氮含量均呈现规律性的变化,即随土层深度的增加,全氮及碱解氮含量下降,350 cm土层以下,变化趋势平缓。在0—200 cm土层,26 a苜蓿草地全氮、碱解氮含量低于4 a、6 a苜蓿草地,高于10 a、12 a苜蓿草地;在200—1000 cm土层,土壤全氮、碱解氮含量在不同生长年限之间差异不大,表明苜蓿生长超过一定年限,土壤氮素有一定恢复,但受土壤氮素累计消耗的影响,只能使土壤上层的氮素逐步得到恢复,而深层土壤氮素难以恢复;苜蓿草地有机碳与全氮、碱解氮及C∶N之间均为正相关关系。苜蓿生长6 a以后,应对苜蓿草地进行合理施肥,以维持苜蓿草地的氮素平衡。
译  名：
Soil nitrogen consumption characteristics of alfalfa grassland in the semi-humid areas of the Loess Plateau
作  者：
WAN Su-mei1,2,HAN Qing-fang1,HU Shou-lin2,JIA Zhi-kuan1,YANG Bao-ping1(1 Research Center of Dryland Farming in Arid and Semi-arid Area,Northwest A & F University,Yangling,Shaanxi 712100,China;2 College of Plant Sciences,Tarim University,Alar,Xinjiang 843300,China)
关键词：
soil organic matter;total N;available N;alfalfa grassland;semi-humid areas
摘  要：
This paper presents a study about soil nitrogen(N) variations in the grasslands with alfalfas growing for four years,six years,ten years,twelve years,eighteen years and twenty-six years.The study showed that there were consistent change of total N and available N contents with alfalfas growing for different lengths of time in 0-1000 cm soil.Soil total N and available N contents decreased with soil depth,and tended to remain relatively constant in soils deeper than 350 cm below soil surface.In 0-200 cm soil,total N and available N contents in 26a was lower than 4a and 6a,but higher than 10a and 12a.In 200 -1000 cm soil,there were little difference among different treatments in total N and available N content,which further illustrated that the recovery of soil nitrogen began in upper soil and high consumption of deep-soil nitrogen in the early alfalfa growth made it difficult to recover soil nitrogen in deep soil.There were positive correlation between SOC and total N,available N and C∶N.After six years of alfalfa growth,fertilization should be applied to maintain nitrogen balance in alfalfa grassland.

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