Characteristics and Influencing Factors of Evapotranspiration and Net CO2 Exchange in Winter Wheat-Summer Maize Field

被引：0
|
作者：
Li C. [1 ]
Wang R. [2 ]
Li Z. [1 ]
Xu Y. [3 ]
机构：
[1] College of Horticulture and Plant Protection, Yangzhou University, Yangzhou
[2] Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing
[3] College of Agriculture, Yangzhou University, Yangzhou
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2022年 / 53卷 / 01期
关键词：
Agroecosystem; Evapotranspiration; Net CO[!sub]2[!/sub] exchange; Structural equation model; Winter wheat-summer maize field;
D O I：
10.6041/j.issn.1000-1298.2022.01.036
中图分类号：
学科分类号：
摘要：
Aiming to reveal the synergistic effect of various factors on cropland evapotranspiration (ET) and net CO2 exchange (NEE) in the Huang-Huai-Hai Plain, a field experiment based on an eddy covariance technique was conducted at a typical winter wheat-summer maize field in Yucheng City, Shandong Province. Based on daily observation data of water and carbon fluxes from 2003 to 2010 and the structural equation model, the characteristics and influencing factors of ET and NEE were systematically analyzed. The results showed that the ET and NEE of different photosynthetic plants (e.g., wheat and maize) had significant differences. Seasonal variations of ET generally showed bimodal curves, with the first peak (in May) higher than the second one (in August) in each year. The ET in the wheat season fluctuated between 315.56 mm and 499.54 mm, with a multi-year average of 398.63 mm, whereas it fluctuated from 221.68 mm to 314.95 mm in the maize season, with a multi-year average of 256.59 mm. The significant trends of ET were found in these two different growing seasons (P< 0.05). Compared with the ET, the NEE also showed a double-peak curves, with the first peak (in April) lower than the second one (in August) in each year. The NEE in the wheat season fluctuated between -367.84 g/m2 and -149.93 g/m2, with a multi-year average of -272.57 g/m2, whereas it fluctuated from -469.63 g/m2 to -118.79 g/m2 in the maize season, with a multi-year average of -293.57 g/m2. The net radiation was an important factor affecting seasonal changes of the ET and NEE in this field, which were mainly found to impose direct effects on the ET and NEE. As for indirect effects, radiation and temperature had great indirect effects on the ET and NEE through the leaf area index in the wheat season, whereas the indirect effect of VPD were larger in the maize season. Additionally, other environmental factors, e.g., the soil water content and wind speed had different effects on the ET and NEE in different growing seasons. © 2022, Chinese Society of Agricultural Machinery. All right reserved.
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页码：331 / 339
页数：8
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