Page 158 - 《高原气象》2022年第6期

6 期 马启民等：鄂尔多斯沙地人工柠条林能量平衡与蒸散研究 1521

Study On Energy Balance and Evapotranspiration of an Artificial

Caragana korshinskii Shrub Land in Ordos Plateau

MA Qimin ，LI Yongshan ，WANG Haibing ，JIA Xiaopeng 4
1
2
3
（1. College of Resources and Environment，Chengdu University of Information Technology，Chengdu 610225，Sichuan，China；
2. School of Urban and Planning，Yancheng Teachers University，Yancheng 224000，Jiangsu，China；
3. College of Desert Control Science and Engineering，Inner Mongolia Agricultural University，Hohhot 010011，Inner Mongolia，China；
4. Key Laboratory of Desert and Desertification，Northwest Institute of Eco-Environment and Resources，
Chinese Academy of Sciences，Lanzhou 730000，Gansu，China）

Abstract：Artificial afforestation has rapidly restored the ecology of the Hobq Desert and the Mu Us Sandy
Land. A thorough understanding of the characteristics of water and energy in sand plantations is of great signifi‐
cance for improving the management of existing plantations and the development of plantation construction. In a
typical sandy artificial Caragana Korshinskii forest in the Yinkensha Forest Farm of the Ordos Plateau，by use of
the Bowen ratio system，meteorological variables such as radiation，humidity，and temperature，and surface soil
heat flux were measured from June 2014 to June 2016. Energy flux and evapotranspiration under different weath‐
er conditions and different time scales in the area were then systematically analyzed based on the observed vari‐
ables. The results show that on a daily scale，variations of the net radiation and surface soil heat flux on a sunny
day were unimodal，while variations of the sensible heat flux and latent heat flux were multimodal. The sensible
heat flux accounted for a large proportion of the net radiation，while the surface soil heat flux accounted for the
smallest proportion. Energy fluxes were greatly affected by the weather condition，with sensible heat flux the
domination in all weather conditions. On a month scale，the net radiation had a unimodal intra-annual variation，
with a monthly average of 37. 3 W·m . The surface soil heat flux fluctuated greatly，accounting for 7. 2% of the
-2
net radiation. Variation of the sensible heat flux was basically consistent with the net radiation. The sensible heat
flux accounted for most of the net radiation，and the monthly average was 24. 5 W·m . The latent heat flux fluc‐
-2
tuated greatly，and was larger in the growing season than in the non-growing season，with a monthly average of
10. 1 W·m . The net radiation was mainly transformed into latent heat flux from Novemeber to February of the
-2
following year，and was mainly transformed into sensible heat flux in other months. The evapotranspiration was
144. 7 mm in the growing season from May to October，and was relatively small，with a value of 55. 6 mm，in
the non-growing season from November to April of the following year. The total evapotranspiration during the
study period was 461. 3 mm，accounting for 77. 5% of the total precipitation in the same period，and the evapo‐
transpiration in 2015 was 176. 8 mm，accounting for 90% of the precipitation. Which inidicate that evapotranspi‐
ration was the most important water expenditure item in the sandy plantation ecosystem.
Key words：Sand plantation；Bowen ratio；energy flux；evapotranspiration