华北农学报 ›› 2020, Vol. 35 ›› Issue (5): 140-148. doi: 10.7668/hbnxb.20191204

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• 资源环境·植物保护 • 上一篇    下一篇

施氮量和种植密度对稻茬晚播小麦干物质积累及光合特性的影响

李欣欣1,2, 石祖梁2, 王久臣2, 王飞2, 徐志宇2, 江荣风1   

  1. 1. 中国农业大学 资源与环境学院, 北京 100094;
    2. 农业农村部农业生态与资源保护总站, 北京 100125
  • 收稿日期:2020-06-23 出版日期:2020-10-28
  • 通讯作者: 石祖梁(1985-),男,江苏宿迁人,副研究员,博士,主要从事作物生理生态研究。
  • 作者简介:李欣欣(1988-),女,河南周口人,助理研究员,博士,主要从事农业生态环境保护研究。
  • 基金资助:
    国家自然科学基金项目(31401335);现代农业产业技术体系岗位科学家项目(CARS-12)

Effects of Nitrogen Application Amount and Planting Density on Dry Matter Accumulation and Flag Leaf Photosynthetic Characteristics for Late-sowing Wheat in Rice-wheat Rotation

LI Xinxin1,2, SHI Zuliang2, WANG Jiuchen2, WANG Fei2, XU Zhiyu2, JIANG Rongfeng1   

  1. 1. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China;
    2. Rural Energy and Environment Agency, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
  • Received:2020-06-23 Published:2020-10-28

摘要: 旨在为稻茬晚播小麦高产高效栽培提供理论依据,在大田试验条件下,研究了施氮量(0,150,225 kg/hm2)和种植密度(150×104,225×104,300×104株/hm2)对稻茬晚播小麦旗叶光合特性及干物质积累转运的影响。研究结果表明,全生育期干物质积累量和叶面积指数(LAI)均随施氮量和种植密度的增加而增加,但拔节后干物质积累比例则随种植密度增加而降低。花后干物质积累量、花前干物质转运量均随施氮量的增加而增加,随种植密度的增加呈先增后降的变化特点。不同处理干物质转运量对籽粒产量的贡献率(CDMRG)平均约为40%,干物质转运效率(DMRE)平均约为26%;CDMRG和DMRE均随施氮量的增加而下降,随种植密度的增加亦呈先升后降的变化趋势。旗叶净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、最大光化学效率(Fv/Fm)、实际光化学效率(φPSⅡ)、叶绿素相对含量(SPAD值)均随施氮量的增加而升高,随种植密度的增加而降低,胞间CO2浓度(Ci)则呈相反的变化趋势。产量及产量构成因素在不同施氮量及种植密度处理下均达极显著差异水平,在本试验条件下,施氮量为225 kg/hm2、种植密度为225×104株/hm2时,有利于维持稻茬晚播小麦的产量稳定,可作为长江中下游地区稻茬晚播小麦的适宜氮密组合模式。

关键词: 稻茬晚播小麦, 施氮量, 种植密度, 干物质积累转运, 旗叶光合特性

Abstract: In order to provide theoretical basis for high yield and high efficiency cultivation of late-sowing wheat in rice-wheat rotation, field experiments were conducted to study the effects of nitrogen rate(0, 150, 225 kg/ha) and planting density(150×104, 225×104, 300×104 plant/ha) on flag leaf photosynthetic characteristics, dry matter accumulation and remobilization of late-sowing wheat. The results showed that both dry matter accumulation and leaf area index (LAI) increased with the raise of nitrogen rate and planting density, but the dry matter accumulation ratio decreased with the increase of planting density after jointing stage. The amount of dry matter accumulation after flowering and dry matter remobilization before flowering increased with the raise of nitrogen rate, also demonstrating the characteristic of increasing first and then decreasing with the increase of planting density. The contribution of dry matter remobilization to grain (CDMRG) under different treatments was about 40% on average, and dry matter remobilization efficiency (DMRE) was 26% on average. In addition, CDMRG and DMRE both decreased with the raise of nitrogen rate, and also showed a trend of first increasing and then decreasing with the raise of planting density. Flag leaf net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), the maximal photochemical efficiency (Fv/Fm), the actual photochemical efficiency (φPSⅡ) and the relative chlorophyll content (SPAD value) were rising along with the increase of nitrogen rate and decreasing with the planting density raise, while intercellular CO2 concentration (Ci) was in an opposite tendency. The yield and yield components were significantly different under different nitrogen application and planting density. Under the conditions of this experiment, when nitrogen application rate was 225 kg/ha and planting density was 225×104 plant/ha, it was conducive to achieve a stable yield for late-sowing wheat, which could be used as an appropriate nitrogen-density combination mode for late-sowing wheat in rice-wheat rotation in the middle and lower plain of the Yangtze River.

Key words: Late-sowing wheat in rice-wheat rotation, Nitrogen rate, Planting density, Dry matter accumulation and remobilization, Photosynthetic characteristics of flag leaf

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引用本文

李欣欣, 石祖梁, 王久臣, 王飞, 徐志宇, 江荣风. 施氮量和种植密度对稻茬晚播小麦干物质积累及光合特性的影响[J]. 华北农学报, 2020, 35(5): 140-148. doi: 10.7668/hbnxb.20191204.

LI Xinxin, SHI Zuliang, WANG Jiuchen, WANG Fei, XU Zhiyu, JIANG Rongfeng. Effects of Nitrogen Application Amount and Planting Density on Dry Matter Accumulation and Flag Leaf Photosynthetic Characteristics for Late-sowing Wheat in Rice-wheat Rotation[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(5): 140-148. doi: 10.7668/hbnxb.20191204.

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