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Water Consumption and Related Factors of Robinia Pseudoacacia, Platycladus Orientalis Plantation Forest in the Semi-arid Loess Hilly Region

Author: WuFang
Tutor: ChenYunMing
School: Northwest University of Science and Technology
Course: Soil and Water Conservation and Desertification Combating
Keywords: Loess Plateau Locust P. orientalis Sap material flow flux density Meteorological factors
CLC: S791.38
Type: Master's thesis
Year: 2011
Downloads: 45
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Abstract


Semi-arid areas of Loess Plateau in China, less precipitation, evaporation, strong, serious soil erosion, fragile ecological environment, to solve the contradiction between the lack of regional water resources and vegetation construction, the continued development of the artificial vegetation, is fundamental to improve the ecological environment of the Loess Plateau region way. Semiarid Loess Hilly Area the locust and juniper plantation TDP sap flow measurement system for continuous monitoring of stem sap flow of locust and arborvitae, and combined with meteorological data, analysis of locust and of P. orientalis stem sap flow dynamics and its impact factors, to calculate the two species, individual tree transpiration. Achieved major results are as follows: 1. Typical weather conditions, similar to the trend of the locust and P. orientalis stem sap flow flux density. Sunny, locust and arborvitae sap flow flux density of material diurnal variation showed a single peak type curve, and photosynthetically active radiation, vapor pressure variation. Locust and oriental arborvitae daily average sap flow flux density were sunny gt; cloudy days gt; cloudy. Exhibition leaves early, with the growth of locust leaves, the sapwood flow flux density values ??gradually increase, showed a single peak curve, during the same period arborvitae the sapwood flow flux density greater than the locust. Growing Season, the diurnal variation of the locust sapwood flow flux density was broad-shaped curve, peak flow flux density slight fluctuations in the diurnal variation of the of oriental arborvitae flow flux density single peak curve, flow starts rising rapidly, reached a peak after a sharp decline. Locust defoliation the sapwood flow flux density decreases gradually, oriental arborvitae minor change, but at night the presence of significant fluid flow. End of leaf expansion and growing vigorously, locust sapwood flow flux density of photosynthetically active radiation, vapor pressure, air temperature, wind speed was a significant positive correlation with the relative humidity was a significant negative correlation, and the relevance of the size of the order photosynthetically active radiation gt; air temperature gt; vapor pressure gt; relative humidity gt; wind speed. Platycladus orientalis growing vigorously, the the sapwood flow flux density and meteorological factors correlation with the same period locust same. 3. Locust DBH and sapwood area, stem diameter and sapwood area between the arborvitae showed the power index. The single wood transpiration water consumption increased diameter increases as chest (ground). Different periods of the growing season, locust and arborvitae wood month water consumption by transpiration cumulative amount was significant seasonal variation, small locust Spring and autumn water consumption, arborvitae transpiration of water consumption in August compared with May , throughout the growing season overall downward trend. 2009 and 2010, black locust and oriental arborvitae monoclonal the entire growing season transpiration. Transpiration water consumption accounts for each month throughout the growing season total transpiration ratio changes between years. Locust woodland growing season in 2009 and 2010, the total water consumption by transpiration were 103.25mm and 96.75mm, the P. orientalis woodland growing season transpiration good total water 194.97mm and 181.90mm. 4. Locust and arborvitae roots are mainly distributed in the 0-60cm soil layer, the average the effective root weight density respectively 0.14mg? Cm-3, 0.29 mg? Cm-3, oriental arborvitae is the locust of 2.07 times. Locust effective root (diameter ≤ 1mm) are mainly distributed in the 20-30cm layer, arborvitae roots are mainly distributed in the 10-20cm soil. Robinia pseudoacacia and Platycladus orientalis woodland 0-30cm depth soil moisture decreased rapidly with the increase of soil depth, which is mainly related to the distribution of effective root, root water uptake led to the decline in soil moisture content, the Platycladus orientalis woodland soil moisture lower than locust. 30cm below the locust and P. orientalis woodland soil moisture trend, a very small increase in the amplitude with the increase of soil depth, water content, the same soil locust and oriental arborvitae woodland soil moisture similar.

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Coniferous > P. orientalis
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