应用生态学报2012，Vol.23Issue(7)：1839-1845,7.
种植密度对冬小麦根系时空分布和氮素利用效率的影响
Effects of planting density on root spatiotemporal distribution and plant nitrogen use efficiency of winter wheat
摘要
Abstract
Taking winter wheat cultivars Tainong 18 (TN18) and Shannong 15 (SN15) as test materials, a field experiment was conducted to study the effects of planting density (135xlO4, 270 x 104, and 405×l04 plants · hm-2 for TN18; 172.5×104, 345×104, and 517.5 ×104 plants · hm-2 for SN15 ) on the root spatiotemporal distribution and plant nitrogen use efficiency of the varieties. For TN18, its root length density, total root absorbing area, and active root absorbing area increased with increasing planting density, and peaked at planting density 405×104 plants · hm-2 during the whole growth period. For SN15 , its root length density, total root absorbing area, and active root absorbing area achieved the highest values at planting density 345×104 plants · hm-2 at booting and late grain-filling stages. The grain yield, nitrogen uptake efficiency, nitrogen partial factor productivity, and nitrogen use efficiency of TN18 were the highest at planting density 405 × 104 plants · hm-2, and those of SN were the highest at planting density 345×104 plants · hm-2 but had less differences between the densities 345×104 and 517.5×104 plants · hm-2. The inorganic nitrogen accumulation in different soil layers decreased with increasing planting density at maturity stage. Taking grain yield and nitrogen use efficiency into consideration, the appropriate planting density of TN18 and SN15 would be 405×l04 and 345×l04 plants · hm-2, respectively.关键词
冬小麦/种植密度/根系/时空分布/氮素利用效率Key words
winter wheat/ planting density/ root system/ spatiotemporal distribution/ nitrogen use efficiency.分类
农业科技引用本文复制引用
王树丽,贺明荣,代兴龙,周晓虎..种植密度对冬小麦根系时空分布和氮素利用效率的影响[J].应用生态学报,2012,23(7):1839-1845,7.基金项目
国家重点基础研究发展计划项目(2009CB118602)和国家公益性行业(农业)科研专项(201203096)资助. （2009CB118602）
