The Upper Broadleaved And Lower Bamboo Mixed Model Effect On Soil Moisture

In this paper the upper broadleaf and lower Moso bamboo mixed forestexisting broadleaf forest on that the mountaintop was researched. The effects ofmountaintop broadleaf forest on the soil water physical property, spatialdistribution of soil moisture and dynamics of soil moisture of bamboo forest wereanalyzed. In this paperⅠ,Ⅱ,Ⅲ three types were researched. The proportion ofbroadleaf forest on the mountaintop in total slope projection area respectively is0%,10%,25%. Type Ⅰ is Moso bamboo pure forest. The main conclusions are asfollows:1. The order of soil bulk density from large to small was plot Ⅰ (1.04g/cm3)>plot Ⅱ (0.90g/cm3)>plot Ⅲ (0.81g/cm3). The size order of soil totalporosity, the soil capillary porosity, the soil non-capillary porosity, the maxmoisture capacity and the field capacity of soil are Ⅲ>Ⅱ>Ⅰ.By measuring thesoil water characteristic curve, it was concluded that the order of soil water holdingcapacity is Ⅲ>Ⅱ>Ⅰ.2. The soil moisture of three types in the vertical direction, the soil moistureof type Ⅱ and Ⅲ with depth deeper and showed a slow decreasing trend, thetopsoil moisture of type Ⅰ is the lowest. The average soil moisture of0-20cm and20-40cm showed the following order: Ⅲ>Ⅱ>Ⅰ, the average soil moisture of40-60cm showed the following order: Ⅱ <Ⅲ <Ⅰ. The soil moisture of three typesin the horizontal direction, by comparing different types of the sam e slope position,the average soil moisture of uphill、middle and downhill slope positions showed thefollowing order Ⅲ>Ⅱ>Ⅰ. Through the upper broadleaf, slope position and soildepth three-factor analysis of variance on the average analysis of soil moistur eshowed that three factors influence the mean soil moisture relative size of the orderis the slope position> the upper broadleaf> soil depth, especially broadleaf forestsand upper slope position interaction to explain the high average soil moisturevariations.3. The change of soil water during the whole growing season could be dividedinto four stages, namely, soil water subsidized period、 soil water accumulatedperiod、soil water restoration period and soil water steady period. The soil moistureseasonal changes and diurnal variation of the upper broadleaf and lower bamboomixed business model are same, the monthly average and the daily average of soilmoisture showed the following order Ⅲ>Ⅱ>Ⅰ. During rainfall, soil moisture increases the size of the order of magnitude of Ⅰ <Ⅱ <Ⅲ, and during the intervalof rainfall, soil moisture loss rate for Ⅰ> Ⅱ> Ⅲ.Combination of the above conclusions, the study of the upper broadleaf andlower bamboo mixed business model on soil physical properties and soil organiccarbon is significant. With the increase in the proportion of broadleaf forests, thestronger of the soil physical structure and water conservation capacity in t he upperbroadleaf and lower bamboo mixed business model. Therefore, the upper broadleafand lower bamboo mixed forest is well in forest sustainability management.