Deposition flux of NOィイD22ィエD2 in natural vegetation

NOiD22 在自然植被中的沉积通量

• 批准号: 10460142
• 负责人: AOKI Masatoshi
• 金额: $ 6.02万
• 依托单位: Tokyo University of Agriculture & Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10460142/
• 关键词: NOィイD22ィエD2 absorption from air; Deposition flux; Deposition velocity; red pine plantation; crop fields; meteorological factors; seasonal transition; annual total deposition; NO_2 フラックス; アカマツ群落; コムギ畑; NO_2濃度; 日射量; 窒素成分量

The objective of the study is to find out the deposition flux (FィイD2NO2ィエD2) and amount of NOィイD22ィエD2 deposition in natural vegetation. The results are the following:1. The long-term measurement system of NOィイD22ィエD2 flux and deposition velocity (KN02) is developed and tested in red pine plantation of about 15m tall and crop fields.2. NOィイD22ィエD2 flux and deposition velocity in crop fields (soybean, wheat, maize and paddy rice) and pine plantation showed systematic diurnal transition with the maximum at around noon. The diurnal transition was affected strongly by solar radiation.3. Deposition velocities (KィイD2NO2ィエD2) of NO2 in crop fields were smaller than those of 03 (KOィイD23ィエD2.4. KィイD2NO2ィエD2 in crop fields were in the range of 0. 5-1 cm/s, while the values of KィイD2NO2ィエD2 in red pine forest were 1-2cm/s in May-June and Oct.-Nov. But in July - Sept., the values in the pine forest became 5-10 times larger than that of crop fields.5. Montly means of FィイD2NO2ィエD2 and KィイD2NO2ィエD2 were affected strongly by air temperature.6. The extremely large values in June-Sept. will not be explained by the stomata conductance of red pine leaf, and then the possibility of chemical reaction with terphene and DMS in and above the pine forest is expected.7. Monthly average FィイD2NO2ィエD2 were 0, 0, 47, 80, 106, 106, 399, 1726, 480, 106, 96, 4, respectively from January to December.8. Deposition amount in a year was estimated as about 3.2 and 0.9 kgNOィイD22ィエD2/mィイD12ィエD1/year, respectively in the pine plantation and in wheat-soybean crop field, and the value of pine forest was 3.6 times larger than the wheat-soybean crop field.

本研究的目的是了解自然植被中的沉降通量（F_（10））D_2NO_2_（10）D_2）和NO_（10）D_22_（10）D_2沉降量。研究结果如下：1.研制了NO_（12）、D_2、D_2通量和沉积速率（KN_（02））的长期监测系统，并在15 m左右的红松种植园和农田进行了试验.农田（大豆、小麦、玉米和水稻）和人工种植园NO、D22、D2通量和沉降速率均表现出系统的日变化，中午前后达到最大值。日变化受太阳辐射的影响较大. NO2在农田中的沉积速率（K_（max））小于03（K_（max）），而NO2在农田中的沉积速率（K_（max））小于03（K_（max））。农田土壤钾、硝态氮和硝态氮含量在0. 5-1 5 - 6月和10 - 10月红松林的K_（max）、D_2NO_2、D_2NO_2值为1-2cm/s。但在7月至9月，松林中的值比农田中的值大5-10倍. F_（10）D_2NO_2_（10）D_2和K_（10）D_2NO_2_（10）D_2的月平均值受气温影响较大. 6月至9月的数值非常大。不能用红松叶片的气孔导度来解释，因此，可以推测在松林内和松林上方可能与萜烯和DMS发生化学反应. 1 ~ 12月平均F_（10）D_2NO_2、F_（10）D_2分别为0、0、47、80、106、106、399、1726、480、106、96、4。油松种植园和麦豆轮作地的年沉积量分别为3.2和0.9 kgNO_（22）NO_（22）D_（12）NO_（12）D_（1）/年，油松林的年沉积量是麦豆轮作地的3.6倍。