摘要
以青藏高原的拉萨河谷下游的灌丛草原和农田为研究对象,在中国科学院拉萨高原生态试验站的农田与附近的灌丛草原开展实验,利用SHAW模型模拟了2004年10月-2005年9月灌丛草原与农田水热平衡以及根系吸水过程。模拟结果经分析得出,(1)农田所接收的净辐射比灌丛草原要多,农田接收的能量大部分以潜热形式支出,全年的波文比为0.29;而灌丛草原的波文比为0.89。灌丛草原全年的潜热通量是农田的53%,具有一定的抑制蒸散发的功能。(2)农田耗水量是灌丛草原的1.8倍。农田由于大量的灌溉造成较大的渗漏损失,同时也增加了土壤蒸发这一无益损耗。(3)深层土壤水向上的补给与根系吸水两方面的模拟都表明,灌丛草原的植被比农田能更大程度地利用深层土壤水。
More and more natural vegetation land has been transformed into crop fields in the Lhasa river valley on the Tibetan Plateau with the local population growth and economic development. However, the land cover changes would exert great impact on ecosystems energy and water balance and water use. We did experiments in crop fields at Lhasa Plateau Ecosystem Research Station and the nearby shrub grassland. Then we researched the water and energy balance and the processes of water extraction from roots using SHAW model based on experiment data and climatic data obtained at Lhasa Plateau Ecosystem Research Station. By the analysis of the simulated results, some main conclusions were drawn as follows. （1） Net radiation received by crop fields was more than shrub grassland; and the outgoing latent heat from crop fields was dominating, with the all-year Bowen ratio being 0.29. As for the shrub grassland, the all-year Bowen ratio was 0.89. The outgoing latent heat of shrub grassland was 53% of crop fields. Thus, shrub grassland limited evapotranspiration to some extent. （2） The water consumed of crop fields was nearly twice of that of shrub grassland. Irrigation resulted in much deep percolation and increased soil evaporation. （3） The deep soil water supply and root extraction indicated that shrubs could absorb deep soil water that could not be used by crops.
出处
《地理学报》
EI
CSCD
北大核心
2009年第3期303-314,共12页
Acta Geographica Sinica
基金
国家重点基础研究发展计划(973计划)(2005CB422005)
重大基础研究前期研究专项(2005CCA05500)~~
关键词
拉萨河谷
灌丛草原
农田
SHAW模型
水热平衡
根系吸水
Lhasa river valley
shrub grassland
crop fields
SHAW model
water and heat balance
root extraction
