农业机械学报2024，Vol.55Issue(5)：334-343,378,11.DOI:10.6041/j.issn.1000-1298.2024.05.032
散射辐射对鄱阳湖平原典型稻田总初级生产力的影响
Effects of Diffuse Radiation on Gross Primary Productivity of Typical Paddy Fields in Poyang Lake Plain
摘要
Abstract
Exploring the impact of diffuse radiation changes on the gross primary productivity(GPP)of paddy ecosystem can provide a reference for the assessment of paddy carbon sink capacity and yield estimation.The eddy covariance(EC)system was used to measure the CO2 flux in the double-cropping paddy field in the Poyang Lake Plain for two consecutive years(2017-2018).The data from the mid-season period of rice was segmented according to the diffuse fraction(DF),and the effect of diffuse radiation and other meteorological factors on GPP under different DF conditions were explored.The results showed that the effects of different types of radiation on GPP were different.For both the early rice and the late rice,GPP and PAR showed a quadratic curve relationship(R2 was 0.49 and 0.70).Under different DF conditions,the variation trend of GPP of early and late rice with diffuse photosynthetically active radiation(PARdif)was different.When DF was 0.1～0.4,GPP of early rice did not change significantly with PARdif,GPP of late rice was increased with PARdif(R2=0.23),and GPP of early and late rice was decreased when DF was 0.4～0.7(R2 was 0.38 and 0.02).When DF was 0.7～1.0,GPP of early and late rice showed a significant upward trend with PARdif(R2 was 0.32 and 0.89),indicating that PARdif was an important factor affecting GPP of rice.As for the direct photosynthetically active radiation(PARdir),when PARdir was between 0～10 mol/(m2 d),GPP was increased rapidly with the increase of PARdir,and then tended to be stable.With the increase of DF,GPP and DF showed a quadratic curve relationship(R2 was 0.45 and 0.67),while the light use efficiency(LUE)and DF showed a significant linear positive correlation(R2 was 0.68 and 0.82).The optimal DF of the early and the late rice were 0.48 and 0.40,respectively.The changes of DF caused the changes of meteorological factors such as air temperature(Ta)and water vapor pressure deficit(VPD),which had a synergistic effect on rice GPP.The results of path analysis between meteorological factors and GPP showed that the effects of meteorological factors on GPP varied under different DF conditions.Overall,the increase of Ta and VPD had positive and negative effects on rice GPP,respectively.Ta,PARdir and PARdif were the main meteorological factors affecting GPP for the early rice,and PARdif,PARdir and PARdif were the main meteorological factors for the late rice when DF was 0.1～0.4,0.4～0.7 and 0.7～1.0,respectively.关键词
散射辐射/气溶胶/总初级生产力/稻田/通径分析/鄱阳湖平原Key words
diffuse radiation/aerosol/gross primary production/paddy field/path analysis/Poyang Lake Plain分类
天文与地球科学引用本文复制引用
刘博,侯佳佳,时元智,崔远来..散射辐射对鄱阳湖平原典型稻田总初级生产力的影响[J].农业机械学报,2024,55(5):334-343,378,11.基金项目
国家自然科学基金长江水科学研究联合基金项目(U2040213)、江西省水利科技项目(202123YBKT09)和江苏省高等学校基础科学研究面上项目(21KJB210021) （U2040213）
