Dissertation > Agricultural Sciences > Forestry > Forest tree species > Coniferous > Larch

Characteristics of Sap Flow and Transpiration of Three Woody Plant Species (Caragana Korshinskii, Hippophae Rhamnoides, Larix Principi-rupprechtii) in the Area of Liupan Mountain, South Ningxia, China

Author ShenZhenXi
Tutor WangYanHui
School Chinese Academy of Forestry
Course Ecology
Keywords Semi-arid areas Ningxia Liupanshan Caragana intermedia Sea Buckthorn North Larch Flow Transpiration Evapotranspiration Stomatal conductance Soil moisture
CLC S793.6;S791.22
Type PhD thesis
Year 2005
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In order to understand the relationship of vegetation ecological water use and water resources in semi-arid areas of northwestern China in the the Liupanshan north side Guyuan, select Seabuckthorn (Hippophae rharnnoides,) Caragana (CaraganaKorshinskii) and North China larch (the Larix principi- rupprechti) three local soil and water conservation or water conservation forest tree species in the 2003-2004 growing season for the study, the use of advanced flow measurement techniques, determination of the flow characteristics of these three plants, and in accordance with the flow estimate single tree transpiration and community. Soil moisture, Forest Structure and micrometeorological factors observations, analysis of the variation of a single tree and community level water consumption by transpiration and water use characteristics of different vegetation. The main results are as follows: seabuckthorn June to September 2004, the water conservation forest areas in Ningxia Guyuan Liupanshan piles of small watershed, select the 12-year-old natural sea buckthorn community forest plots, using the principle of thermal equilibrium wrap sap flow was measured and temporal variation in the sea buckthorn plant sap flux (monoclonal unit time liquid flow rate, g ยท h to -1), and thus is calculated based on the transpiration rate of the leaf area (hereinafter referred to as transpiration rate), estimated transpiration of sea buckthorn community water consumption. The results showed that the diurnal variation of sap flux and transpiration rate curve on a sunny day showing a single peak type, at night still flow movement, sea buckthorn liquid flow rate at night around during the day 17.78%, night flow accounts Total day 12.87-13.84% of the total liquid flow. Changes in sea buckthorn liquid liquid the local microclimate drive and impact, including global solar radiation is the main impact factor, followed by air vapor pressure deficit (VPD), air temperature and relative humidity. Transpiration rate and environmental factors size as follows: VPD gt; solar radiation GT; relative humidity gt; temperatures gt; wind GT; temperature. From June to September, sea buckthorn transpiration rate was significantly decreased, transpiration rate and the increase of sea buckthorn leaf area was a significant negative correlation (P lt; 0.0001), found that the transpiration rate of change stomatal regulation compensation, such compensation role in leaf area index (LAI) high community performance will be more obvious. Sea buckthorn community transpiration increases with the increase in leaf area index, when more than 82% of the 5-10 month of transpiration water consumption exceeds the annual precipitation (generally in the 8-9 age), the growth of sea buckthorn community began to be water shortage restrictions, population regulation within the enhanced role of the fluctuating phase, change the sea buckthorn communities transpiration. 2. Caragana to wrap sap flow measurement system, in July 2003 in Guyuan Yellow Soil and Water Conservation District 1986 planted artificial C. intermedia community flow transpiration and environmental factors continuous day and night observation, the establishment of Caragana intermedia transpiration regression model, and analyze the compare water consumption dynamic caragana land. The results showed that: daytime branches liquid liquidity and branches of the thickness of a positive correlation the flow flux difference between the branches in daytime and night; thick branches of transpiration water consumption rate observed diurnal variation curve in the sunny midday reduce the phenomenon , midday decline of time between 12:10 to 13:20. The C. korshinskii flow rise and weak transpiration at night, the twig average transpiration water consumption accounted for 5.84% of the day transpiration at night. Caragana intermedia transpiration water consumption rate and solar radiation, air temperature, air saturation deficit and relative humidity of air has significant correlation, the transpiration rate of water consumption and environmental factors in the regression equation. Through the establishment of the transpiration rate regression model and estimates of meteorological factors, soil moisture content, two

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