散射辐射比例与冬小麦光能利用率和总初级生产力的关系

doi:10.3969/j.issn.1000-6362.2018.07.004

中国农业气象 ›› 2018, Vol. 39 ›› Issue (07): 462-467.doi: 10.3969/j.issn.1000-6362.2018.07.004

散射辐射比例与冬小麦光能利用率和总初级生产力的关系

杨晓亚，李俊，江晓东，同小娟，于强

1. 南京信息工程大学应用气象学院/江苏省农业气象重点实验室，南京 210044；2. 中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室，北京 100101；3. 北京林业大学林学院，北京 100101；4. 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室，杨凌 712100

出版日期:2018-07-20 发布日期:2018-07-17
作者简介:杨晓亚（1983?），女，博士，研究方向为气候变化与作物生理生态。E-mail: yangxy@nuist.edu.cn
基金资助:
江苏省自然科学基金青年基金（BK20140988）；国家自然科学基金青年基金（31400416）

Relationships between Diffuse Radiation Fraction and Light Use Efficiency and Gross Primary Productivity of Winter Wheat

YANG Xiao-ya, LI Jun, JIANG Xiao-dong, TONG Xiao-juan, YU Qiang

1. College of Applied Meteorology/Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101; 3. College of Forestry, Beijing Forestry University, Beijing 100101; 4. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100

Online:2018-07-20 Published:2018-07-17

摘要/Abstract

摘要： 利用冬小麦拔节乳熟期（2004-04-01—05-20和2005-04-10—05-31）在田间观测的每30min涡度相关和小气候数据，计算散射辐射比例（DF）与光能利用率（LUE）和总初级生产力（GPP）之间的数量关系，以期为提高LUE模型和作物模型的模拟准确度提供依据。结果表明：冬小麦拔节-乳熟期DF与LUE间呈极显著的线性正相关关系（P＜0.001），DF与GPP间为极显著的抛物线关系（P＜0.001），即随着DF的增加，LUE呈线性增长，而GPP呈先增加后降低的变化趋势。2004年和2005年观测实验表明，中等太阳辐射条件下，即DF和光合有效辐射（PAR）的均值分别为0.57和27.7molm?2d?1时，冬小麦GPP达到最高。2004年与2005年相比较，DF与LUE、DF与GPP关系均存在较大差异，这主要归因于两年间冬小麦拔节?乳熟期PAR水平和DF分布频率的差异。

关键词: 散射辐射比例；光能利用率, 总初级生产力, 光合有效辐射, 冬小麦

Abstract: The quantitative relationships between the diffuse radiation fraction (DF) and light use efficiency (LUE) and gross primary productivity (GPP) from jointing to milky maturity of winter wheat (from April 1, 2004 to May 20 and from April 10, 2005 to May 31) were analyzed in this research on the basis of field CO2 flux observation. The research results can improve the simulation accuracy of LUE model and crop model. The results indicated that the relationship between DF and LUE was significantly positive linear (P＜0.001), and the relationship between DF and GPP was significantly parabolic curve (P＜0.001). LUE increased linearly with the increasing of DF, while GPP increased first and then decreased. Observational experiments on 2004 and 2005 showed that the GPP of winter wheat reached the highest under the condition of moderate solar radiation, with the average values of DF and photosynthetic active radiation (PAR) were 0.57, 27.7molm?2d?1, respectively. The quantitative equations between DF and LUE and GPP in two years were different. The differences were mainly attributed to the different PAR level and the distribution frequency of DF from jointing to milky maturity of winter wheat during the two years.

Key words: Diffuse radiation fraction, Light use efficiency, Gross primary productivity, Photosynthetic active radiation, Winter wheat

杨晓亚，李俊，江晓东，同小娟，于强. 散射辐射比例与冬小麦光能利用率和总初级生产力的关系[J]. 中国农业气象, 2018, 39(07): 462-467.

YANG Xiao-ya, LI Jun, JIANG Xiao-dong, TONG Xiao-juan, YU Qiang. Relationships between Diffuse Radiation Fraction and Light Use Efficiency and Gross Primary Productivity of Winter Wheat[J]. Chinese Journal of Agrometeorology, 2018, 39(07): 462-467.

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散射辐射比例与冬小麦光能利用率和总初级生产力的关系

Relationships between Diffuse Radiation Fraction and Light Use Efficiency and Gross Primary Productivity of Winter Wheat

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