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皖南地区玉米农田生态系统碳通量的变化特征

发表时间:2019-08-30  浏览量:158  下载量:13
全部作者: 陈宇,许小燕
作者单位: 合肥工业大学土木与水利工程学院
摘 要: 研究利用涡度相关系统,对我国皖南地区春玉米和夏玉米农田分别进行观测,得到不同时间尺度玉米地碳通量的变化规律:玉米地碳通量在白天总体为负值,主要因光合作用而呈现碳汇功能;在夜晚总体为正值,主要因呼吸作用而呈现碳源功能;碳通量的日变化规律呈现为夜间平稳,白天先下降再上升的“U”型单峰曲线,或在此基础上中午出现“光合午休”现象的“W”型双峰曲线;在玉米生长的前期,碳通量的绝对值较小,而在玉米生长的中后期,碳通量的绝对值显著增大;在阴天与低温典型日,白天碳通量变化较为平缓;在高温典型日,玉米的碳源功能显著增强,碳汇功能与低温典型日相差不大。影响玉米地碳通量变化的环境因子有气温、饱和水汽压差、净辐射和土壤温度等,玉米地在降雨后碳汇功能的峰值高于降雨前,在日时间尺度上,皖南地区玉米地碳通量的变化受饱和水汽压差影响最大,受净辐射影响最小。
关 键 词: 农业基础科学;碳通量;涡度相关系统;玉米农田;碳源;碳汇
Title: Variation characteristics of carbon flux in corn farmland ecosystem in southern Anhui province
Author: CHEN Yu, XU Xiaoyan
Organization: College of Civil Engineering, Hefei University of Technology
Abstract: In this research, the eddy covariance system was used to observe the spring corn and summer corn farmland in southern Anhui province. The variation of CO2 flux in corn fields at different time scales was obtained: the CO2 flux of corn field in the daytime negative value is mainly affected by photosynthesis and exhibits carbon sink function; CO2 flux is positive at night, mainly due to respiration and carbon source function; the daily variation of CO2 flux is stable at night, and then rises during the day. The ‘U’ type single peak curve, or the ‘W’ type double peak curve of ‘photosynthetic midday-depress’ phenomenon at noon; in the early stage of corn growth, the absolute value of CO2 flux is small, and in the middle and late stages of corn growth, the absolute value of CO2 flux increased significantly. On a typical day of cloudy and low temperature, the carbon flux variation during the day is relatively flat; on the typical day of high temperature, the carbon source function of corn is significantly enhanced, and the carbon sink function is not much different from the typical low temperature. The environmental factors affecting the variation of carbon flux in corn field include temperature, vapor pressure deficit, net radiation and soil temperature. The peak of carbon sink function of corn field is higher after rainfall than before. On the daily time scale, the variation of carbon flux in corn field in southern Anhui is most affected by vapor pressure deficit and is minimally affected by net radiation.
Key words: basic science of agriculture; carbon flux; eddy covariance system; corn farmland; carbon source; carbon sink
发表期数: 2019年8月第4期
引用格式: 陈宇,许小燕. 皖南地区玉米农田生态系统碳通量的变化特征[J]. 中国科技论文在线精品论文,2019,12(4):656-666.
 
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