| In order to revealing Liupan Mountain hydrological function of forests,foresthydrology Liupan Mountain correct evaluation of functional role for Liupan Mountainand ultimately promote the implementation of such a reasonable recovery of forestvegetation and the construction of natural forest protection project to provide atheoretical basis for the local forest management to provide technical support.In thispaper the study site in the small watershed of Diediegou at the northwest part ofLiupan Mountains.study.Study on eco-hydrological processes of several vegetationtypes.The contents of the dissertation are comprised of vegetation canopyinterception,Different vegetation evapotranspiration and and transpiration of arborcharacteristic analysis.seasonal dynamics change of several vegetation types,andwater holding capacity of litter and soil layers.Purpose is to reveal the test area northLiupan Mountains vegetation and hydrological effects of different types ofrelationships.The main results are as follows:1.The interception of different vegetation canopyIn growing period of2011(June to October).with the maximal value inHippophae rhamnoides shrubs, followed by the plantations of Larixprincipis-rupprechtii and the shrubs of Ostryopsis davidiana. the maximalthroughfall ratio by the plantations of Larix principis-rupprechti;followed by theplantations of Hippophae rhamnoides; and the shrubs of Ostryopsis davidiana.themaximal stem flow ratio in Ostryopsis davidiana shrubs＞Larix principis-rupprechtii＞Hippophae rhamnoides shrubs.after one51.6mm rainfall event, accounting for1.64%of the total rainfall depth.Rainfall beginning of time,the maximum retentionrate, as rainfall increases,retention rate and smaller,until it reaches the maximumwater holding capacity of the canopy, gradually tends to saturate.Atmosphericprecipitation on vegetation changes as stem flow, when rainfall beginning of time,didnot produce sap flow, along with the increase in rainfall stem flow linear growth.rainfall beginning of time,did not produce penetrating rain, with an increase inrainfall,through fall gradually increased, with an increase in rainfall,rainfall gradually to penetrate the outer rain forest amount to move closer.2.Different undergrowth vegetation evaporation and transpiration characteristics ofLarix principis-rupprechttiGrowing season (May-October) maximum evaporation out of Larixprincipis-rupprechtti sample plot for the885.01mm and449.03mm in sample plotLarix principis-rupprechtti, and different undergrowth vegetation (June-in October),evaporation of Grassland> Ostryopsis davidiana shrubs> Larix principis-rupprechtii> Hippophae rhamnoides.Larix principis-rupprechtii sap flow velocity(SFV) at the time of rainfall, theSFV will be reduced to sunny at night over the same level or lower, and multimodal.Cloudy conditions, Larix principis-rupprechtii flow show unimodality type;. Sunnydays appear obvious diurnal change rule, for "unimodality type". Peak sunshine afterthe rain of SFV were higher than of daily mean value and more clear, with the passageof time, due to the reduced soil moisture content, the SFV began to gradually decrease,and tends to peak before the rain. Night flow in different period of growing season’sSFV were greater than the late SFV, the growing season three period (early season,middle season, in the end of the season) at different periods of rainy days under thecondition of the average SFV changes in different periods at night are relatively flat,2011sample in different months in average daily transpiration in growing season ismay,＞August＞June＞July,＞September＞, October3.The dynamics variation of soil water condition and water storage capacitySoil moisture changes throughout the year is divided into three periods:(1)moisture accumulation period before April~October month of the year,(2) the waterconsumption period of May~August,(3) water recovery from August to October.1m soil maximum storage capacity for: Larix principis-rupprechtii forest> Ostryopsisdavidiana shrubs> Grassland> Hippophae rhamnoides. |
PDF Full Text Request