Surface energy balance and distribution are the result of the interaction of vegetation， climate and other factors.The study of energy， especially the distribution of turbulent flux and its influencing factors， is of vital importance to regional water resources management， and is also of great significance for guiding scientific agricultural production.North China has a vast territory， a variety of vegetation types crisscross distribution， and the land surface process is more complex.Water vapor and precipitation caused by summer monsoon activities will change the underlying surface water， thermal characteristics and solar radiation forcing characteristics， which makes the factors affecting the characteristics of surface energy distribution more complicated.The study of surface energy balance and distribution process in this region is helpful to further understand the productivity and climate change of its ecosystem.Therefore， this paper analyzed the observation data of "Cooperative observation experiment in North China"， and finally selects four vegetation types in north China， meadow， desert grassland， corn farmland and semi-arid grassland， which represents the vegetation types in the north of China to a certain extent.Based on a deep understanding of the characteristics of surface energy distribution， the effects of environmental factors on energy distribution are discussed.The results show each component of surface energy on a typical underlying surface presents a unimodal change trend， with obvious diurnal characteristics.Surface energy is uneven on each underlying surface.The energy closure of the above four typical underlying surfaces is 71%-91%， of which the semi-arid grassland is the largest and the corn farmland is the smallest.From the ratio of each energy component to net radiation， the net radiation of desert grassland and semi-arid grassland heats the atmosphere mainly in the form of sensible heat， and the percentage of sensible heat flux to net radiation is 29% and 36%， respectively.Alpine meadow and corn farmland latent heat flux is dominant， accounting for 42% and 37% of the net radiation， respectively.Among the meteorological factors affecting the Bowen ratio which is the water and heat comprehensive parameters of each underlying surface， the semi-arid grassland is affected by the ground-air temperature difference （） and vapor pressure deficit （）， while the corn farmland is mainly affected by the ground and air temperature difference （）.The Bowen ratio of the desert grassland is influenced by the ground-air temperature difference （） and average wind speed （）.In addition， there is a significant exponential relationship between Bowen ratio and NDVI， and decreases with the increase of NDVI.
XueYuan REN
,
Qiang ZHANG
,
Ping YUE
,
Jin Hu YANG
,
XinYang YAN
. Study on Energy Partitioning and its Environmental Factors of Four Types of Typical Underlying Surfaces in North China[J]. Plateau Meteorology, 2021
, 40(1)
: 109
-122
.
DOI: 10.7522/j.issn.1000-0534.2020.00008
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