应用生态学报2012，Vol.23Issue(12)：3369-3376,8.
施氮和隔根对玉米植株生长、产量和根际微生物的影响
Effects of nitrogen fertilization and root separation on the plant growth and grain yield of maize and its rhizosphere microorganisms
摘要
Abstract
A field experiment with root separation was conducted to study the effects of root interaction in maize-soybean intercropping system on the plant growth and grain yield of maize and its rhizosphere microorganisms under different nitrogen fertilization levels (0. 1, 0.3, 0.5, and 0. 7 g·kg-1). Root interaction and nitrogen fertilization had positive effects on the plant height, leaf length and width, and leaf chlorophyll content of maize. Less difference was observed in the root dry mass of maize at maturing stage between the treatments root separation and no root separation. However, as compared with root separation, no root separation under the nitrogen fertilization levels 0. 1, 0. 3, 0. 5, and 0.7 g·kg-1 increased the biomass per maize plant by 8. 8% , 6.3% , 3.6% , and 0.1% , and the economic yield per maize plant by 17. 7% , 10. 0% , 8.2%, and 0. 9% , respectively. No root separation increased the quantity of rhizosphere fungi and azotobacteria significantly , as compared with root separation. With increasing nitrogen fertilization level, the quantity of rhizosphere bacteria, fungi, and actinomycetes presented an increasing trend, while that of rhizosphere azotobacteria decreased after an initial increase. The root-shoot ratio of maize at maturing stage was significantly negatively correlated with the quantity of rhizosphere bacteria, fungi, and actinomycetes , but less correlated with the quantity of rhizosphere azotobacteria. It was suggested that the root interaction in maize-soybean intercropping system could improve the plant growth of maize and increase the maize yield and rhizosphere microbial quantity, but the effect would be decreased with increasing nitrogen fertilization level.关键词
根系互作/隔根/叶绿素含量/产量/微生物Key words
root interaction/ root separation/ chlorophyll content/ yield/ microorganism分类
农业科技引用本文复制引用
张向前,黄国勤,卞新民,赵其国..施氮和隔根对玉米植株生长、产量和根际微生物的影响[J].应用生态学报,2012,23(12):3369-3376,8.基金项目
国家自然科学基金重点项目(U1033004)资助. （U1033004）
