林业科学 ›› 2023, Vol. 59 ›› Issue (8): 1-11.doi: 10.11707/j.1001-7488.LYKX20210821
收稿日期:
2021-11-04
出版日期:
2023-08-25
发布日期:
2023-10-16
通讯作者:
马英杰
E-mail:xndns024@126.com
基金资助:
Ying Qiao1,2(),Yingjie Ma2,*,Mingliang Xin2
Received:
2021-11-04
Online:
2023-08-25
Published:
2023-10-16
Contact:
Yingjie Ma
E-mail:xndns024@126.com
摘要:
目的: 获取完整且有效的枣林通量数据,分析生态系统能量平衡,为评估干旱区枣林生态系统与大气间的能量和物质交换提供理论依据。方法: 选择R语言REddyProc包插补涡度相关法测量的通量数据,采用交叉验证法和能量平衡闭合度评价插补数据质量,并修正热储存项,分析2018、2019年新疆阿克苏地区枣林能量平衡闭合度与能量变化趋势。结果: 1) REddyProc包插补通量数据效果较好,交叉验证的误差统计参数为回归系数b=0.86~0.99、决定系数R2=0.86~0.95、一致性指数d=0.96~0.98、模拟效率EF=0.84~0.92、均方根误差与观测值标准差比率RSR=0.28~0.40;2) 经REddyProc包插补后,2018、2019年干旱区枣林能量平衡闭合度分别为73.45%、73.11%,有效能量和可利用能量的决定系数均为0.97;加入热储存项后,能量闭合度分别提高3.72%、2.75%,达77.17%、75.86%,增幅较小;3) 各能量分项(净辐射、潜热通量、显热通量、土壤热通量)的日均变化规律在生育期和休眠期相似,日均变化均呈以净辐射变化规律为基础的单峰变化。结论: 干旱区枣林全年能量平衡闭合度符合ChinaFlux范围,热储存项对改善枣林能量平衡闭合度有一定影响,可为研究枣林能量和物质交换提供理论依据。
中图分类号:
乔英,马英杰,辛明亮. 基于REddyProc的干旱区枣林通量数据插补及能量平衡分析[J]. 林业科学, 2023, 59(8): 1-11.
Ying Qiao,Yingjie Ma,Mingliang Xin. Flux Data Interpolation and Energy Balance Analysis of Jujube Forests in Arid Areas by Employing REddyProc[J]. Scientia Silvae Sinicae, 2023, 59(8): 1-11.
表1
干旱区枣林的月均气温和灌溉量"
时间 Time | 气温 Temperature/℃ | 灌溉量 Irrigation amount/mm | 时间 Time | 气温 Temperature/℃ | 灌溉量 Irrigation amount/mm | |
2018-04 | 16.58 | 65.33 | 2019-04 | 16.16 | 90.63 | |
2018-05 | 18.93 | 120.96 | 2019-05 | 18.26 | 130.50 | |
2018-06 | 22.42 | 206.94 | 2019-06 | 21.35 | 130.50 | |
2018-07 | 24.07 | 178.73 | 2019-07 | 24.74 | 170.38 | |
2018-08 | 22.71 | 162.90 | 2019-08 | 22.92 | 192.13 | |
2018-09 | 17.00 | 112.24 | 2019-09 | 17.74 | 134.13 | |
2018-10 | 10.24 | 0 | 2019-10 | 11.08 | 0 |
表2
阿克苏站点试验仪器汇总"
观测项目Observation items | 传感器型号 Instrument model | 厂家及产地 Manufacturer and origin | 采集频率 Acquisition frequency | 安装位置 Installation location |
空气温湿度 Air temperature and humidity | EL-USB-2 | OMEGA,USA | 30 min | 0.3 m,1 m,2 m,3 m,4 m |
HMP155A | VAISALA,FL | 20 s | 6 m | |
水热通量Hydrothermal flux | IRGASON | Campbell Scientific,USA | 10 Hz | 6 m |
CO2通量CO2 flux | IRGASON | Campbell Scientific,USA | 10 Hz | 6 m |
土壤热通量Soil heat flux | HFP01 | Campbell Scientific,USA | 10 s | ?8 cm |
土壤温度 Soil temperature | TCAV | Campbell Scientific,USA | 30 min | ?6 cm,?10 cm |
Insentek Ⅱ | Insentek,CHN | 30 min | ?10 cm | |
土壤含水率 Soil moisture content | Hydra Probe Ⅱ | Stevens,FL | 3 0min | ?2.5 cm,?2 5 cm,?50 cm,?75 cm,?100 cm |
Insentek Ⅱ | Insentek,CHN | 30 min | ?10 cm | |
太阳辐射Solar radiation | CNR4 | Campbell Scientific,USA | 1 s | 5.5 m |
数据采集器Data collector | CR3000 | Campbell Scientific,USA | 30 min | 1.5 m |
表3
涡度相关法监测半小时尺度通量数据质量分级"
质量分级 Quality classification | H数据个数 Number of H | 占比 Proportion(%) | LE数据个数 Number of LE | 占比 Proportion(%) | NEE数据个数 Number of NEE | 占比 Proportion(%) |
0 | 282 | 0.80 | 5 762 | 16.44 | 4 250 | 12.13 |
1~3 | 9 857 | 28.13 | 7 168 | 20.46 | 7 233 | 20.64 |
4~6 | 2 097 | 5.98 | 1 809 | 5.16 | 2 267 | 6.47 |
7 | 5 445 | 15.54 | 4 532 | 12.93 | 5 998 | 17.12 |
8 | 4 982 | 14.22 | 4 814 | 13.74 | 4 806 | 13.72 |
9 | 12 377 | 35.32 | 10 955 | 31.26 | 10 486 | 29.93 |
合计Total | 35 040 | 100.00 | 35 040 | 100 | 35 040 | 100.00 |
剔除数据Eliminate data | 16 640 | 47.49 | 16 775 | 47.87 | 14 736 | 42.05 |
表4
交叉验证法的误差参数统计"
误差统计参数 Error statistics parameters | 2018 | 2019 | |||||
H | LE | NEE | H | LE | NEE | ||
回归系数 Regression coefficient(b) | 0.97 | 0.86 | 0.88 | 0.94 | 0.86 | 0.88 | |
决定系数 Determination coefficienti(R2) | 0.87 | 0.95 | 0.94 | 0.86 | 0.94 | 0.93 | |
一致性指数 Index of agreement(d) | 0.96 | 0.97 | 0.98 | 0.96 | 0.96 | 0.97 | |
模型模拟效率 Efficiency of simulation(EF) | 0.85 | 0.90 | 0.92 | 0.84 | 0.87 | 0.91 | |
均方根误差与观测值 标准差比率 RMSE-observations standard deviation ratio(RSR) | 0.39 | 0.31 | 0.28 | 0.40 | 0.36 | 0.30 |
表5
干旱区枣林的能量平衡闭合度"
项目Item | 能量平衡闭合度Energy balance ratio(%) | ||||||
2018 | 2019 | ||||||
全年Year-round | 生育期 Fertility period | 休眠期 Dormant period | 全年Year-round | 生育期 Fertility period | 休眠期 Dormant period | ||
未计入热储存项 Not including thermal storage item | 73.45 | 75.34 | 71.31 | 73.11 | 77.60 | 68.02 | |
计入热储存项 Including thermal storage item | 77.17 | 80.37 | 73.54 | 75.86 | 82.16 | 68.72 |
表6
干旱区枣林热储存项占净辐射的比例"
年份Year | 大气显热储存量/净辐射Atmospheric sensible heat storage/net radiation | 大气潜热储存量/ 净辐射 Latent atmospheric heat storage/net radiation | 冠层热储存量/ 净辐射 Canopy heat storage/net radiation | 土壤热储存量/ 净辐射 Soil thermal storage/net radiation | 植物光合储存量/ 净辐射 Plant photosynthetic storage/net radiation | 热储存项/净辐射 Heat storage items/net radiation |
2018 | 1.49 | 0.2 | 0.39 | ?0.02 | 2.32 | 4.38 |
2019 | 1.21 | 0.21 | 0.31 | 0.01 | 2.21 | 3.96 |
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