Using HYSPLIT model to analyze the migration and dispersion of Empoasca vitis (Göthe) in tea garden
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摘要:
目的 明确假眼小绿叶蝉[Empoasca vitis (Gothe)]迁飞扩散行为特征,初步揭示影响其种群迁飞扩散的关键因素。 方法 利用系留气球悬挂诱虫黄板诱捕不同朝向、不同高度假眼小绿叶蝉,通过HYSPLIT-4气流动力模型和气象数据,分析模拟假眼小绿叶蝉迁飞扩散行为。通过田间虫口调查,结合种群密度与扩散系数分析,明确推动假眼小绿叶蝉种群分布转化的驱动因素。 结果 假眼小绿叶蝉最高飞行高度为8 m,2~8 m高度内,随高度增加,假眼小绿叶蝉数量逐步下降。HYSPLIT-4气流动力模型分析结果表明,假眼小绿叶蝉迁飞轨迹只与迁飞时间有关,高度对其迁飞轨迹与直线扩散距离没有影响。此外,HYSPLIT-4气流动力模型分析结果还表明,假眼小绿叶蝉24 h直线迁飞距离为35.70~178.10 km。种群密度与扩散系数分析表明,假眼小绿叶蝉有聚集分布和随机分布两种分布型,迁飞和扩散是导致两种分布型转化的重要因素。 结论 借助气流,假眼小绿叶蝉可以实现区域性的迁飞。在种群密度驱动下,假眼小绿叶蝉种群分布存在聚集分布和随机分布的转化,也促使假眼小绿叶蝉种群发生田间扩散和区域性迁飞。因此,假眼小绿叶蝉的防控应以主要防治区为中心,向外扩展200 km 的范围内开展统防统治。 Abstract:Objective Characterising the migratory dispersal behaviour of the leafhopper, Empoasca vitis (Göthe), and revealing the initial key factors that influence migratory dispersal of its populations. Method In this study, we employed tethered balloons affixed with yellow insect-trapping boards to ensnare E. vitis at varying heights and orientations. Subsequently, we analysed and simulated E. vitis migratory and dispersal behaviours using the HYSPLIT-4 airflow dynamics model and meteorological data. By combining field population surveys with analyses of population density and dispersal coefficient, we elucidated the key factors driving the transformation of E. vitis population distribution. Result The maximum flying altitude attained by E. vitis was 8 metres, and the population density of E. vitis experienced a steady decline as the altitude increased from 2-8 metres. The HYSPLIT-4 aerodynamic model analysis indicated that the migration trajectory of E. vitis was solely determined by the migration time, with no impact from the altitude on the migration trajectory or the linear dispersal distance. The HYSPLIT-4 aerodynamic model's results demonstrated that E. vitis has a linear dispersal distance of 35.70-178.10 km within 24 hours. Further analysis of population density and dispersal coefficient indicated both aggregated and random distribution of E. vitis, with migration and dispersal considered influential in the transformation of distribution types. Conclusion E. vitis may undergo regional migration through air currents. The transition between aggregated and random distribution of E. vitis populations, driven by population density, also plays a role in field dispersal and regional migration. Therefore, control of E. vitis should be concentrated in the main control area and extended outwards for 200 km. -
Key words:
- Empoasca vitis /
- migration /
- HYSPLIT model /
- distribution types /
- tea
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图 1 不同高度黄板诱集的叶蝉数量
A:相同高度不同方向上黄板所粘假眼小绿叶蝉数量百分比比较;B:同一方向,不同高度黄板所粘假眼小绿叶蝉数量百分比比较;图中数据为平均值±标准误,经Duncan’s新复极差检验(One-way ANOVA,P>0.05),A图中同一高度数据具有相同字母者表示差异不显著;B图中同一朝向数据具有相同字母者表示差异不显著。
Figure 1. Number of E. vitis trapped at different heights
A: Comparison of the number of E. vitis on the sticky card traps at the same height and at different orientations in percentage terms; B: Comparison of the number of E. vitis on the sticky card traps at the same orientation and at different height in percentage terms. The data in the graphs are mean ± standard error, as tested by Duncan's new replicated extreme variance test (One-way ANOVA, P>0.05), Columns of the same height with the same letter in graph A indicate insignificant differences. Columns of the same orientation with the same letter in graph B indicate insignificant differences.
表 1 试验地气象数据
Table 1. Meteorological data of experimental sites
日期
Date最高气温
Mmaximum
temperature / ℃最低气温
Minimum
temperature / ℃日平均气温
Average daily
temperature /℃天气
Weather风级与风向
Beaufort scale
and direction日平均风速
Average daily wind
speed/ (m·s−1)06-10 27.0 18.0 24.2 阴 西南风2级 2.5 06-11 25.0 19.0 22.1 阴 东北风2级 1.9 06-12 25.0 19.0 22.3 阴 东风2级 2.8 06-13 25.0 20.0 22.6 雾 东南风4级 6.2 06-14 29.0 23.0 24.5 小雨 东北风2级 3.2 使用当日2:00、8:00、14:00、20:00的温度值、风速值计算日平均气温和日平均风速。日最低气温和日最高气温由仪器自动记录。风向以当日持续时间最长的风向为当日风向。
The daily average air temperature and daily average wind speed are calculated using the temperature values and wind speed values at 2:00, 8:00, 14:00 and 20:00 of the day. The daily minimum temperature and daily maximum temperature are recorded automatically by the instrument. Wind direction is taken as the wind direction with the longest duration of the day.表 2 不同起飞时间假眼小绿叶蝉模拟迁飞着落点及直线距离
Table 2. The simulated landed location and migrate straight-line distance of E. vitis at different take-off time
日期
Date迁飞起算时间
Take-off time历时
Flight time/h高度
Height/m着落经度
Longitude of the landing site着落纬度
Latitude of the landing site着落点位置
Landing site直线迁飞距离
Straight-line migration distance/km06-11 5:00 24 2 106.5467o E 29.2040 o N 重庆市巴南区 35.27 4 106.5467o E 29.2040 o N 重庆市巴南区 35.27 6 106.5467o E 29.2040 o N 重庆市巴南区 35.27 8 106.5467o E 29.2040 o N 重庆市巴南区 35.27 06-12 5:00 24 2 106.2560o E 29.5961 o N 重庆市璧山区 48.78 4 106.2419 o E 29.6080 o N 重庆市璧山区 50.47 6 106.2289 o E 29.6200 o N 重庆市璧山区 52.07 8 106.2150 o E 29.6340 o N 重庆市璧山区 53.84 06-13 5:00 24 2 105.2911 o E 28.7945 o N 四川省泸州市 159.57 4 105.2909 o E 28.7947 o N 四川省泸州市 159.58 6 105.2212 o E 28.7953 o N 四川省泸州市 165.54 8 105.0697 o E 28.8094 o N 四川省泸州市 178.10 06-14 5:00 24 2 105.7789 o E 29.3321 o N 重庆市永川区 94.36 4 105.7789 o E 29.3321 o N 重庆市永川区 94.36 6 105.7789 o E 29.3321 o N 重庆市永川区 94.36 8 105.7789 o E 29.3321 o N 重庆市永川区 94.36 根据HYSPLIT模拟轨迹,利用Google earth 6.0 (Google Inc.,NASDAQ:GOOG)测得着落点经纬度及直线迁飞距离。Latitude, longitude and linear distance of the landing site were measured from the HYSPLIT simulated trajectory using Google Earth 6.0 (Google Inc., NASDAQ: GOOG). 表 3 假眼小绿叶蝉种群扩散系数
Table 3. Coefficient of E. vitis Population
日期
Date扩散系数C
Coefficient扩散系数95%置信区间
Diffusion coefficient 95%
confidence interval2019/4/2 0.8962* 1±0.6089 2019/4/17 0.5643* 1±0.9462 2019/5/2 0.4421* 1±0.5839 2019/5/19 0.4807 1±0.4281 2019/6/2 0.3318 1±0.2087 2019/6/17 0.6290 1±0.2036 2019/7/2 0.8289 1±0.1328 2019/7/17 0.7715 1±0.1758 2019/8/2 0.4571 1±0.2010 2019/8/17 0.2460 1±0.2502 2019/9/1 0.3253 1±0.2808 2019/9/16 0.5267 1±0.3652 2019/10/2 0.5976 1±0.3243 2019/10/16 0.6324* 1±0.6077 *代表扩散系数C值在95%置信区间内。
* denotes diffusion coefficient C within 95% confidence intervals. -
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