Synchronous Measurement of Land Surface Processes in Typical Vegetation Landscape Zones in the Hei River Basin
SONG Ke\|chao 1,\ KANG Er\|si 1,\ LAN Yong\|chao1 ,\ ZHANG Xiao\|you1, ZHANG Zhi\|hui 1 ,\ JIN Bo\|wen 1,2,\ ZHANG Ji\|shi3(1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China; 2. Institute of Water Resource Conservation Forest in Qilian Mountains, Zhangye Gansu,734000,China; 3. School of Resources and Environmental Sciences, Lanzhou University, Lanzhou Gansu 730000,China)
On the review of some international research projects related to land surface processes and on the context that sustainable development of environment\|resource\|economy system are restricted to scarce water resource in arid area in northwest China, the researches presented in this paper are aimed to understand the processes related to water and energy cycle and ecological process at different vegetation landscape zones of inland river basins. Understanding of the land surface hydrological processes of energy and water exchange can help us accomplish efficient water resource management, such as water resource allotment, desert vegetation protection, and find the equivalent value which different ecosystem can supply to us at different scenes in inland river basin. Therefore synchronous measurement and experiment on land surface processes, energy and water fluxes in the soil vegetation atmosphere system in typical vegetation landscape zones are expected to find a key for these problems. In the present study, three synchronous measurement fields were set up in upper\|stream mountain vegetation zone, oasis\|desert transitional zone between desert and oasis, the natural oasis zone at the downstream riparian tamarisk forest of the Hei River Basin in the arid area of northwest China. The three fields of measurement and experiment represent typical vegetation landscape zones in a inland river basin. Three environment measurement systems of ENVIS, which can measure standard meteorological factors and other ecological factors were installed in the three typical vegetation landscape zones in Hei river basin. The comparative analysis is carried out on the measurements of SVAT system in three vegetation landscape zones, and theories and approaches to parameterize the water and energy fluxes in SVAT system at the three measurement locations are discussed. The preliminary results obtained indicate that the forest\|grassland\|shrubbery zone in mountain vegetation landscape zones is a cold and wet surface, and the oasis\|desert transitional zone in middle river is a relative wet but dry land surface, while the riparian tamarisk forests and their adjacent places in the downstream area are drier and hotter land surface. In the aspect of carbon cycle and sequestration, the forest\|grassland\|shrubbery is a sink for carbon sequestration according to preliminary research, and there have distinct discriminations between the middle stream and the downstream area.