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Effect of Subsurface Drip Irrigation on Distribution of Soil Moisture and Growth of Turfgrass

Author: ChenPeng
Tutor: SuDeRong
School: Beijing Forestry University
Course: Grassland
Keywords: Lawn Subsurface drip Soil moisture distribution Turf Growth Root Distribution
CLC: S688.4
Type: Master's thesis
Year: 2009
Downloads: 100
Quote: 2
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Abstract


This paper studies the underground drip irrigation system used in lawn, with water, buried in the lawn roots does not affect the characteristics of urban landscape in the soil. Dripper, Drip Irrigation Lateral two subsurface drip emitter for the study, through the indoor simulation and field comparison test, discussed under subsurface drip irrigation, soil moisture, the the lawn root distribution law, the wetting front eigenvalues. The study showed that: (1) drip capillary significant differences in soil moisture in the horizontal direction, while drippers significant differences in soil moisture in the vertical direction. Soil moisture in the horizontal direction of the the dripper irrigation level direction distribution differences small irrigation uniformity, and drip irrigation capillary effect of deep irrigation. (2) to the emitter size of the horizontal dividing line formed by the upper and lower part of the wetting front vary, but the shape of the two parts are semi-ellipsoidal. (3) the wetting front in all directions the moist distance and time have significant power function, the functional relationship can be expressed wetting front migration distance in all directions at different times, so as to provide theoretical support underground drip irrigation design and layout. (4) Drip Irrigation Lateral the humid distance relationship in different out flow: vertical downward direction in the horizontal direction vertical upward direction. Dripper the humid distance relationship: horizontal direction vertically downward direction vertical upward direction. Verified field trials Conclusion For the moisture migration regular drip capillary and the Dripper conditions under. (5) Since drip irrigation capillary flow is relatively small, the force of gravity is greater than the pressure head role downward migration velocity of the water is higher than the other direction, observation angle from O ° to 180 ° change process, the wetting front speed gradually increased large. The Dripper out moisture migration by the interaction of gravity and pressure head flow speed gradually increased from 0 ° to 90 °. 90 ° to 150 ° moisture migration speed decreased; relative increase in the 150 ° to 180 ° moisture migration speed. (6) under drip irrigation capillary conditions, in order to ensure that the 0-10cm of soil in the lawn roots ample irrigation, buried depth should be between 6-10cm; distance infiltration and temporal changes of wet horizontal direction, spacing in the layout between 30-40cm. Buried under the dripper conditions put depth should be between 10-15cm, layout spacing should be between 45-65cm. (7) The use of underground drip irrigation of Festuca arundinacea turf, reviving period growth rate differences significantly with; under different processing Festuca arundinacea tiller number and chlorophyll content of the differences are not significant with, and therefore in the water to meet lawn growth and development of, using different emitter, the depth, or to increase the moisture diffusion device, has little effect on the tiller and chlorophyll content of tall fescue lawn. Aboveground biomass accumulation significantly influence the moisture diffusion device installed its greater impact, underground biomass remained relatively stable; root to shoot ratio remained at a high level, reflecting a tall fescue lawn under Subsurface Drip Irrigation better drought resistance, subsurface drip irrigation to help improve the performance of lawns and drought.

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CLC: > Agricultural Sciences > Gardening > Ornamental Horticulture ( flowers and ornamental trees) > Garden Plant Cultivation and application technology > Lawns and ground cover plants
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