摘要
以玉米品种大叶矮小型的矮单268(AD268)和小叶高大型的先玉335(XY335)为供试材料,设置低(3株·m^(-2))、中(6株·m^(-2))、高(9株·m^(-2))3个种植密度,综合利用冠层光合有效辐射(PAR)垂直分布数据、冠层三维模型与冠层光合模型,分析了对数法和回归法估算出的消光系数(k_(log)和k_(nls))对品种和种植密度的响应及其差异,评估消光系数估算方法对冠层光能利用模拟的影响。结果表明:k_(log)和k_(nls)存在差异,这种差异在大叶矮小型品种AD268下表现更加明显,且差异随着种植密度的增加而加剧,基于k_(nls)对冠层光分布的拟合效果(R^(2)=0.86)优于k_(log)(R^(2)=0.77);基于k_(log)和k_(nls)的玉米冠层光能利用特征对种植密度的响应规律在不同品种间存在明显差异,以k_(log)和k_(nls)模拟的AD268的日CO_(2)同化量、地上部干物质日积累量和光能利用效率在低密度下无明显差异,但在中高密度下差异较大,二者差异开始变大的临界密度为0.7~2.5株·m^(-2)。
A field experiment for the AD268 with large leaf and dwarf structure and the XY335 with small leaf and high structure at three planting densities of low(3 plants·m^(-2)),medium(6 plants·m^(-2))and high(9 plants·m^(-2))was conducted.This study integrated the vertical distribution of canopy photosynthetically active radiation(PAR),a 3D canopy model,and a canopy photosynthesis model to analyze responses of the extinction coefficients estimated by the logarithmic approach(k_(log))and the regression approach(k_(nls))to cultivar and density and their differences,and to evaluate the effects on simulating canopy light utilization.The results showed that there was a difference between k_(log) and k_(nls),and this difference was more obvious for AD268 and aggravated with increasing density.The fitness based on k_(nls) for canopy light distribution(R^(2)=0.86)was better than k_(log)(R^(2)=0.77).The daily CO_(2) assimilation,above-ground dry matter accumulation and radiation use efficiency of AD268 simulated by k_(log) and k_(nls) did not differ significantly at low densities,but the difference became larger with increasing density.The critical densities at which the difference become larger were 0.7-2.5plants·m^(-2).
作者
王俊浩
顾生浩
徐田军
陈博
温维亮
张立祯
郭新宇
WANG Jun-hao;GU Sheng-hao;XU Tian-jun;CHEN Bo;WEN Wei-liang;ZHANG Li-zhen;GUO Xin-yu(Information Technology Research Center,Beijing Academy of Agriculture and Forestry Sciences/National Engineering Research Center for Information Technology in Agriculture,Beijing 100097,China;College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193;Maize Research Center,Beijing Academy of Agriculture and Forestry Sciences,Beijing 100097;College of Resources and Environmental Sciences,Jilin Agricultural University,Changchun 130118)
出处
《中国农业气象》
CSCD
北大核心
2022年第10期773-785,共13页
Chinese Journal of Agrometeorology
基金
国家自然科学基金(32001420
31871519)
北京市农林科学院创新能力建设专项(KJCX20220401)
财政部和农业农村部“国家现代农业产业技术体系”
关键词
作物模型
参数估计
光能利用效率
高光效
理想株型
Crop model
Parameter estimation
Radiation use efficiency
High photosynthetic efficiency
Ideotype
