冬小麦田臭氧干沉降观测及降水影响机制

生态学杂志

冬小麦田臭氧干沉降观测及降水影响机制

魏莉¹,郑有飞^1,2,3*,赵辉³

(¹南京信息工程大学环境科学与工程学院，南京 210044；²江苏省大气环境监测与污染控制高技术研究重点实验室，南京 210044；³南京信息工程大学大气物理学院，南京 210044)

出版日期:2019-07-10 发布日期:2019-07-10

Ozone dry deposition in winter wheat field and the influence from rainfall.

WEI Li¹, ZHENG You-fei^1,2,3*, ZHAO Hui³

(¹School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; ²Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing 210044, China; ³School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China).

Online:2019-07-10 Published:2019-07-10

摘要/Abstract

摘要： 利用涡度相关系统配合快速、慢速O₃浓度分析仪，对郑州冬小麦田的O₃干沉降过程进行连续观测，探讨了冬小麦田O₃干沉降特征，分析了降水对O₃干沉降的影响机制。结果表明：观测期间，O₃浓度日均值为42.7 nL·L^-1，主要受太阳辐射和湿度影响，具有明显的逐日变化和昼夜变化特征；O₃通量的日均值为-0.0073 μmol·m^-2·s^-1（负号表示方向向下），受O₃浓度影响较大，日变化规律呈单谷型；O₃沉降速率受大气湍流、植被的生育特征和气象条件等因素影响，日均值为0.38 cm·s^-1，日变化为明显的单峰型；沉降速率的大小主要受大气动力过程控制，而冠层阻力在上午9:30达到了日最低值，是导致O₃沉降速率日最大值出现在上午的主要因素；降水主要通过增加非气孔沉降和降低大气湍流交换来影响冬小麦田的O₃沉降速率，因此在不同背景条件下，降水对O₃干沉降的影响结果也不尽相同。

关键词: 融雪水, 入渗, 水量平衡, 筒测法

Abstract: An eddy-covariance system combined with rapid and slow ozone concentration analyzer was used to measure ozone (O₃) dry deposition continuously in a winter wheat field in Zhengzhou. The aim of this study was to reveal the characteristics of O₃ dry deposition in winter wheat field, and to examine the influence of rainfall. The results showed that the daily average value of O₃ concentration was 42.7 nL·L^-1 during the observation period. O₃ concentration was mainly affected by solar radiation and humidity, with obvious daily and diurnal variations. The diurnal variation of O₃ flux was singlevalley type, with daily mean value of -0.0073 μmol·m^-2·s^-1 (minus sign refers the direction towards the ground), which was greatly affected by the O₃ concentration. The O₃ deposition velocity was affected by atmospheric turbulence, vegetation growth characteristics, and meteorological conditions, with daily mean value of 0.38 cm·s^-1. The diurnal variation was obvious single-peak type. The deposition velocity was mainly controlled by atmospheric dynamic process. The canopy resistance reached the daily minimum value at 9:30 a.m., which was the main factor leading to the maximum daily O₃ deposition velocity in the morning. Rainfall affected the O₃ deposition velocity of winter wheat field by increasing non-stomatal deposition and reducing atmospheric turbulence exchange. Therefore, the effects of rainfall on O₃ dry deposition were dependent on background conditions.

Key words: snowmelt water, infiltration, water balance, cylinder method.

魏莉,郑有飞,赵辉. 冬小麦田臭氧干沉降观测及降水影响机制[J]. 生态学杂志.

WEI Li, ZHENG You-fei, ZHAO Hui. Ozone dry deposition in winter wheat field and the influence from rainfall.[J]. cje.

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