应用生态学报2018，Vol.29Issue(3)：827-838,12.DOI:10.13287/j.1001-9332.201803.012
华北平原冬小麦农田生态系统CO2通量特征及其影响因素
Characteristics of CO2 flux and its influence factors over winter wheat agroecosystem in the North China Plain
摘要
Abstract
Using CO2 flux data of winter wheat recorded by eddy covariance system,combined with the meteorological data,we examined the diurnal variations of CO2 fluxes in four growth stages(tillering stage,overwintering stage,jointing stage and filling stage ) of winter wheat in an agroecosystem of the North China Plain from 2013 to 2014. The seasonal variation of net ecosystem exchange and its relationship with meteorological factors were investigated. The results showed that the net ecosystem exchange in the whole growing season was -360.15 g C·m-2. The gross primary productivity in the whole growing season was 1920.01 g C·m-2. The winter wheat agroecosystem had strong capacity in carbon sequestration. The CO2 fluxes showed an obvious diurnal and seasonal variation characteristics in winter wheat agroecosystem. This ecosystem was a carbon source in tillering stage,while it was a carbon sink in overwintering stage,jointing stage and filling stage. The mean value of apparent initial light energy utilization was 0.03 mg CO2·μmol-1. The mean value of ecosystem production was 1.53 mg CO2·m-2·s-1 when light was saturated. The monthly average value of ecosystem respiration was 193.92 g C·m-2·month-1. The net ecosystem exchange and photosynthetically active radiation had a significant correlation in four growth stages of winter wheat. The correlations between net ecosystem exchange and vapor pressure deficit were significant in all the growth stages. There was a positive correlation between daily total net ecosystem exchange and soil temperature in tillering stage,overwintering stage and filling stage,but a negative correlation between them in jointing stage.关键词
冬小麦农田生态系统/CO2通量/净生态系统碳交换/涡度相关系统/华北平原Key words
winter wheat agroecosystem/carbon dioxide flux/net ecosystem exchange/eddy covariance system/the North China Plain引用本文复制引用
吴东星,李国栋,亢琼琼,张茜,曹梓豪,李珍..华北平原冬小麦农田生态系统CO2通量特征及其影响因素[J].应用生态学报,2018,29(3):827-838,12.基金项目
本文由国家自然科学基金项目(U1404401)、河南省高校科技创新团队支持计划项目(161RTSTHN012)和河南大学新兴交叉及特色学科培育项目(XXJS20140003)资助 （U1404401）
