Transpiration of a Pinus tabulaeformis and Robinia pseudoacacia mixed forest in Hilly-gully region of the Loess Plateau,West Shanxi Province
LIU Cai-Feng-；Zhang-Zhi-Jiang-；Guo-Jun-Ting-；Cha-Tong-Gang-；Sun-Jian-Xin
1.Key Lab.of Soil & Water Conservation and Desertification Combating,Ministry of Education;2.College of Forest Science,Beijing Forestry University: 100083,Beijing,China
Abstract：Understanding of the relations between plant and water is the key to successfully implement protective afforestation programs in the Hilly-gully region of the Loess Plateau,West Shanxi Province.Our study measured sap flow of 17 trees covering 4 diameter classes in a 16 years old Pinus tabulaeformis and Robinia pseudoacacia mixed forest stand from July to October in 2008 using Thermal Dissipation Probe(TDP) in Caijiachuan watershed in Jixian County,Shanxi Province.At same time,we also measured the changes of environmental factors.The diurnal fluctuation of sap flow velocity of Pinus tabulaeformis and Robinia pseudoacacia was experienced a significant difference in the starting time,time to peak,dramatic decreasing time,and lasting time duration of sap fow velocity.The diurnal transpiration rate increased against the diameter of breast height except for 6 and 12cm pine trees.We found that the solar radiation and vapor pressure deficit were the major factors to control the canopy transpiration of Pinus tabulaeformis and Robinia pseudoacacia.In addition,monthly stand transpiration scaled up from sapwood area were 30.8mm,24.1mm,26.3mm,and 18.4mm for July,August,September,and October,2008,respectively.The total transpiration amount during this four months period was less than the total rainfall amount during the same time.
刘彩风1；张志强1；郭军庭1；查同刚1；孙建新2. 晋西黄土丘陵沟壑区油松刺槐混交林蒸腾耗水[J]. 中国水土保持科学, 2010, 8(5): 42-48.
LIU Cai-Feng-；Zhang-Zhi-Jiang-；Guo-Jun-Ting-；Cha-Tong-Gang-；Sun-Jian-Xin. Transpiration of a Pinus tabulaeformis and Robinia pseudoacacia mixed forest in Hilly-gully region of the Loess Plateau,West Shanxi Province. SSWCC, 2010, 8(5): 42-48.
2010, Vol. 8 
