摘要
根据长武试区 1986～ 1995年的统计资料并结合田间试验 ,对黄土旱塬麦田生态系统的主要物质 (氮、磷、钾 )循环及平衡特征进行了较为系统的分析。结果表明 ,农田中养分的流动量大 ,流通途径少 ,养分循环的开放性大 ,外循环规模大 ,内循环率小 ;系统养分平衡中 N基本保持收支平衡 ,K2 O入不敷出 ,P2 O5 输入大于输出 ;养分输入中 ,人工投入的化肥与有机肥是养分的主要来源 ,输出中 N主要集中于籽粒 ,K2 O主要集中于秸秆 ,P2 O5 主要残留于土壤中。指出在农业生产中 ,应采用秸秆还田以增加钾的投入 ,同时要增加氮肥投入尤其是有机肥的投入 ,而磷应以提高其有效性为主。
Based on the statistical data,field experiments and farmland investigation in Changwu Agro ecological Experimental Station, the balance of major nutrition elements(N,P 2O 5,K 2O) of the typical dry farmland ecosystem on Loess Plateau rainfed highland were comparatively systematically studied. The results showed that the material flow volume is big, the scope of outer cycling is big;the major source of nutrition are chemical fertilizer and manure.N maintains equilibrium between input and output, K 2Os input is smaller than output,but P 2O 5s income is bigger.The major output of N is in grains, K 2Os in straws, P 2O 5 remains chiefly in soil. So, stalks should be returned to field to increase the input of K 2O;but to P 2O 5,the efficiency of phosphorus in the soil should be improved,not inputting too much blindly.
出处
《水土保持学报》
CSCD
北大核心
2001年第1期85-89,共5页
Journal of Soil and Water Conservation
基金
中科院知识创新项目!( KZCX1-0 6-0 2 -0 1)
国家重点基础专题项目!( G19990 1170 8)
