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Study on Water Conservation Function of the Picea Crossifolia in Central of Qilian Mountains

Author: SunChangPing
Tutor: LiuXianDeï¼›WangYouKe
School: Gansu Agricultural University
Course: Forest Management
Keywords: Different forest types Canopy interception Litter layer moisture transfer Soil moisture dynamics Qilian Mountains
CLC: S718.5
Type: Master's thesis
Year: 2010
Downloads: 70
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Abstract


Northwest arid and semiarid zones typical forest types - water conservation forest in Qilian Mountains representatives to take full advantage of the Qilian Mountains Forest Ecosystem Research Station of historical data, combined with the experimental observations, precipitation characteristics, the canopy layer moisture transfer, moss and litter material layer aspects of water transport in forest soil moisture dynamics, to explore the theoretical and practical problems to solve the forest and water relations, to obtain the results of the following aspects: (1) precipitation for the year change is divided into the rainy season and the dry season, the rainy season (May to October) rainfall accounts for about 87.2% of the annual precipitation; dry season (November to April) rainfall is rare, accounting for only about 12.8% of the annual precipitation. Precipitation and snowfall and rainfall in two forms, accounted for 72.2% of the rainfall, snowfall of 27.8%. The snow is unique Qilian Mountains Forest \(2) canopy interception generally increases with increases in precipitation increases, but the increase is limited, canopy interception interception maximum holding limit no longer increase with increased precipitation, and sometimes was downward trend. Canopy interception rate of between 22.6% to 34.5%, with an average of 29.4%, under normal circumstances, canopy interception rate gradually decreases with increasing rainfall level. In descending order of the five forest types canopy interception Qinghai Spruce Forest gt; wet shrubberies gt; Sabina przewalskii gt; the dry shrubs gt; sloping pasture. (3) litter layer effective water-holding capacity wet shrubs 152.65mm gt; the Qinghai spruce forest 150.04mm gt; the dry shrubs 36.12mm gt; Sabina przewalskii 11.49mm gt; sloping pasture. (4) test soil moisture content has a significant spatial and temporal differences. The water content of the soil layer has decreased with soil depth, the vertical variation of soil moisture and more moisture content of soil relative water content less; different types of soil infiltration rate differences, Pailugou watershed forest loose soil texture, infiltration the initial infiltration rate of the Qinghai spruce forest soil A00 214.4mm/min, steady infiltration rate 162.0mm/min, penetration than other soil surface, sloping pasture surface infiltration rate is only for the Qinghai spruce woodland 0.43%, the subsoil only 30%. To provide scientific basis for the study of different forest types of forest ecosystems in the Qilian Mountains in central Water Conservation Function Evaluation and pattern, the Qilian Mountains Forest Ecological Construction Plan layout, engineering mode selection.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Forest Ecology
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