摘要
采集吉林省玉米植株及土壤样品 ,研究不同土壤类型和肥力、玉米不同品种和生育时期土壤 植物系统根际养分动态变化及植物吸收的相互关系 .结果表明 ,玉米地土壤NH+ 4 N、NO-3 N在根际富集 ,其变化主要与化肥供应有关 .高肥力土壤根际有效磷亏缺 ,种植密度越大 ,根际亏缺率越大 ;低肥力土壤则有效磷在根际略高 .高肥力土壤有效钾较高 ,根际有效钾富集也更明显 .茎叶、根对养分的吸收量顺序为 :N≈K >P ,籽实的吸收量大小为 :N >K >P .化学肥料在本地区玉米产量的贡献率仅 1/5～ 1/3 ,其余 2 /3～ 4/5来自施用的有机肥料如鸡粪、牛粪等以及土壤有机、矿质养分的供应 .
Maize plants and soil samples were collected from Jilin Province to study the nutrient dynamics in soil maize plant rhizosphere and their relationship with plant uptake.The results showed that NH + 4 N and NO - 3 N were accumulated in rhizospheric soil, and mainly controlled by the application of chemical fertilizers.Soil available P was depleted in high fertility fields,especially in high seedling density,while accumulated in low fertility fields.Soil available K was accumulated in rhizospheric soil,and its accumulation rate was higher in high fertility than in low fertility fields.The nutrient absorption amount was N≈K>P for maize plant shoots and roots,but was N>K>P for seeds.The contribution rate of chemical fertilizers to maize yield was only 1/5～1/3 in Jilin Province,and the rest was contributed by the application of organic manure,such as chicken feces or cow feces,and by the mineralization of soil organic matter.
出处
《应用生态学报》
CAS
CSCD
2000年第4期545-548,共4页
Chinese Journal of Applied Ecology
基金
国家"九五"科技攻关招标项目
关键词
土壤类型
土壤肥力
土壤养分
根际效应
玉米
Soil type, Soil fertility, Soil nutrient, Rhizospheric effect, Maize.
