Water and Heat Balance and Water Use of Shrub Grassland and Crop Fields in Lhasa River Valley

  • Institute of Geographic Sciences and National Resources Research of CAS,Beijing 100101,China

Received date: 2008-10-12

  Revised date: 2009-01-07

  Online published: 2009-03-25

Supported by

National Basic Research Program of China,No.2005CB422005;The prophase research item of the Key Basic Research Project,No.2005CCA05500


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.

Cite this article

YIN Zhifang,OUYANG Hua,XU Xingliang,SONG Minghua,DUAN Deyu,ZHANG Xianzhou . Water and Heat Balance and Water Use of Shrub Grassland and Crop Fields in Lhasa River Valley[J]. Acta Geographica Sinica, 2009 , 64(3) : 303 -314 . DOI: 10.11821/xb200903005


[1] Zheng Du, Yao Tandong. Uplifting of Tibetan Plateau with its environmental effects. Advances in Earth Science, 2006, 21(5): 451-458.
[郑度, 姚檀栋. 青藏高原隆升及其环境效应. 地球科学进展, 2006, 21(5): 451-458.]

[2] Ye Duzheng, Gao Youxi et al. The Meteorology of the Qinghai-Xizang Plateau. Beijing: Science Press, 1979.
[叶笃正, 高由禧等. 青藏高原气象学. 北京: 科学出版社, 1979.]

[3] Nitta T. Observational study of heat sources over the eastern Tibetan Plateau during the summer monsoon. J. Meteor. Soc. Japan, 1983, 61: 590-605.

[4] Yanai M, Li C, Song Z. Seasonal heating of the Tibetan Plateau and its effects on the evolution of the Asian summer monsoon. J. Meteor. Soc. Japan, 1992, 70: 319-351.

[5] Xu J, Haginoya S. An estimation of heat and water balances in the Tibetan Plateau. J. Meteor. Soc. Japan, 2001, 79 (1B): 485-504.

[6] Xu J, Haginoya S, Masuda K et al. Heat and water balance estimates over the Tibetan Plateau in 1997-1998. J. Meteor.Soc. Japan, 2005, 83: 577-593.

[7] Yang K, Koike T, Ishikawa H et al. Analysis of the surface energy budget at a site of GAME/Tibet using a single-source model. J. Meteor. Soc. Japan, 2004, 82(1): 131-153.

[8] Yu Tonggang. The potential existing space of agricultural development and its development strategy in Lhasa river valley, Tibet, P.R.C. Transactions of the CSAE, 1989, 5(1): 1-7.
[于铜钢. 西藏拉萨河谷农业开发潜在生存空间及其 开发战略. 农业工程学报, 1989, 5(1): 1-7.]

[9] Wei Xinghu, Yang Ping, Dong Guangrong. Agricultural development and farmland desertification in middle "One River and Its Two Branches" River Basin of Tibet. Journal of Desert Research. 2004, 24(2): 196-200.
[魏兴琥, 杨萍, 董光荣. 西藏“一江两河” 中部地区的农业发展与农田沙漠化. 中国沙漠, 2004, 24(2): 196-200.]

[10] Lin Rinuan. Evaluation on agro-climate resource of Lhasa region. Meteorological Science and Technology, 2002, 30(3): 152-157.
[林日暖. 拉萨地区农业气候资源评价. 气象科技, 2002, 30(3): 152-157.]

[11] Team of Comprehensive Scientific Expedition to the Qinghai-Xizang (Tibet) Plateau, CAS. Soils of Xizang (Tibet). Beijing: Science Press, 1985.
[中国科学院青藏高原综合科学考察队. 西藏土壤. 北京: 科学出版社, 1985.]

[12] Liu Yunfen, Ouyang Hua, Zhang Xianzhou et al. Carbon balance in agro-ecosystem in Qinghai-Tibet Plateau. Acta Pedologica Sinica, 2002, 39(5): 636-642.
[刘允芬, 欧阳华, 张宪洲等. 青藏高原农田生态系统碳平衡. 土壤学报, 2002, 39(5): 636-642.]

[13] Team of Comprehensive Scientific Expedition to the Qinghai-Xizang (Tibet) Plateau, CAS. Vegetation of Xizang (Tibet). Beijing: Science Press, 1988.
[中国科学院青藏高原综合科学考察队. 西藏植被. 北京: 科学出版社, 1988.]

[14] Chang Chunping, Zou Xueyong, Zhang Chunlai et al. The characteristics and distribution of the source area of aeolian sand in the valley of Lhasa River's lower reaches, Tibet, China. Journal of Mountain Science, 2006, 24(4): 489-497.
[常春平, 邹学勇, 张春来等. 拉萨河下游河谷风沙源分布特征及其成因. 山地学报, 2006, 24(4): 489-497.]

[15] Flerchinger G N, Saxton K E. Simultaneous heat and water model of freezing snow -residue-soil system: I. Theory and Development Trans. ASAE, 1989, 32: 565-571.

[16] Flerchinger G N, Saxton K E. Simultaneous heat and water model of freezing snow-residue-soil system: II. Field Verification Trans. ASAE, 1989, 32: 573-578.

[17] Flerchinger G N, Pierson F B. Modeling plant canopy effects on variability of soil temperature and water Agricultural and Forest Meteorology, 1991, 56: 227-246.

[18] Xu X, Nieber J L, Baker J M et al. Field testing of a model for water flow and heat transport in variably saturated, variably frozen soil. In: Transportation Research Record No. 1307, Transp. Res. Board, Nat. Res. Council, Washington D.C., 1991, P: 300-308.

[19] Pierson F B, Flerchinger G N, Wright J R. Simulating near-surface soil temperature and water on sagebrush rangelands: A comparison of models. Trans. ASAE, 1992, 35: 1449-1455.

[20] Flerchinger G N, Pierson F B. Modeling plant canopy effects on variability of soil temperature and water: Model calibration and validation. J. Arid Environ., 1997, 35: 641-653.

[21] Flerchinger G N, Sauer T J, Aiken R A. Effects of crop residue cover and architecture on heat and water transfer. Geoderma, 2003, 116: 217-233.

[22] Preston G M, McBride R A. Assessing the use of poplar tree systems as a landfill evapotranspiration barrier with the SHAW model. Waste Management & Research, 2004, 22: 291-305.

[23] Flerchinger G N, Kustas W P, Weltz M A. Simulating surface energy and radiometric surface temperatures for two arid vegetation communities using the SHAW model. Journal of Applied Meteorology, 1998, 37(5): 449-460.

[24] Kang Ersi, Cheng Guodong, Song Kechao et al. Simulation of energy and water balance in soil-vegetation-atmosphere transfer system in the mountain area of Heihe River Basin at Hexi Corridor of Northwest China. Science in China (Series D), 2005, 48(4): 538-548.

[25] Huang M, Jacques Gallichand. Use of the SHAW model to assess soil water recovery after apple trees in the gully region of the Loess Plateau, China. Agricultural Water Management, 2006, 85: 67-76.

[26] Flerchinger G N. The Simultaneous Heat and Water (SHAW) Model: Technical Documentation. Northwest Watershed Research Center USDA Agricultural Research Service, Boise, Idaho. 2000 Technical Report NWRC 2000-09.

[27] Campbell G S. An Introduction to Environmental Biophysics. New York: Springer-Verlag, 1977.

[28] Campbell G S. Soil Physics with BASIC: Transport Models for Soil-plant Systems. Amsterdam: Elsevier, 1985. 150.

[29] Saxton K E, Rawls W J, Romberger J S et al. Estimating generalized soil water characteristics from texture. Soil Sci. Soc. Am. J., 1986, 50: 1031-1036.

[30] Flerchinger G N, Hanson C I, Wight J R. Modeling of evapotranspiration and surface energy budgets across a watershed. Water Resource Research, 1996, 32(8): 2539-2548.

[31] Huang Zichen, Shen Weishou. Plant Water Relationship and Drought Resistance in the Arid Regions. Beijing: ChinaEnvironmental Science Press, 2000. 29-38.
[黄子琛, 沈谓寿. 干旱区植物的水分关系与耐旱性. 北京: 中国环境科学 出版社, 2000. 29-38.]

[32] Cheng Weixin, Hu Chaobing, Zhang Xianquan. Research on the Evapotranspiration of Crop Land and Water Consumption of Crops. Beijing: China Meteorological Press, 1994. 91-105.
[程维新, 胡朝炳, 张兴权. 农田蒸发与作 物耗水量研究. 北京: 气象出版社, 1994. 91-105.]

[33] Sharon M L, Sternber L S, David E B. Water-use patterns of woody species in pineland and hammock communities of South Florida. Forest Ecology and Management, 1999, 118: 139-148.

[34] Duan Deyu. Plant water sources and water use efficiency of dominant species in typical ecosystems on the Tibetan Plateau. Institute of Geographic Sciences and National Resources Research of CAS, Ph.D Thesis, 2007.
[段德玉. 青藏 高原典型生态系统优势植物水分利用来源及利用效率研究. 中国科学院地理科学与资源研究所博士学位论文. 2007.]

[35] Hu Shuyin, Wang Jianlin. Water resource development and application in "one river and its two branches" basin of Tibet. Territory & Natural Resources Study, 1999, (2): 16-18.
[胡书银, 王建林. 西藏一江两河地区水资源及其开发 利用. 国土与自然资源研究, 1999, (2): 16-18.]