Effects Of Typical Soil Bioengineering Measures On Soil Anti-scourability In Huairou District Of Beijing

The employment of soil bioengineering has contributed a lot to the riparian zone protection.In order to study its effect degree on soil anti-scourability.In this study taking three different measure combinations as research object of soil bioengineering demonstration area in Yiduhe Village.Taking the soil anti-scourability as the breakthrough point.Studying the effects of different soil bioengineering measures combinations as follows:species diversity,soil physical and chemical properties and vegetation litters on soil anti-scourability.In order to optimize the design of soil biological engineering measures and further reduce the effect of slope erosion provide evidence.Research indicates:(1)The species diversity of soil biological measures had obvious effect on the improvement of bank slope,and the increase of new vegetation was obvious.According to the correlation analysis between species diversity and soil anti-scourability,it was found that vegetation had begun to protect topsoil,stabilize and improve slope Surface,improve the soil anti-scourability.Demonstration area of the new vegetation to herbs,less shrubs,no trees.The Shannon-Weiner index and the Pielou index of bushmattress(Salix x aureo-pendula)and transplanted vegetation on the experimental plots were low,The results showed that there was a significant positive correlation between species diversity and shrub resistance of shrub plants.It can be seen that the implementation of soil biological measures can effectively improve the soil anti-scourability by enriching the diversity of riparian zone and play an important role in protecting soil and water and preventing soil erosion.(2)Soil biological measures have increased the coverage of the litter layer by increasing the vegetation coverage,thus improving the soil anti-scourability.At the beginning of the soil bioengineering measures,although the litterthickness layer was thinner,but through the field of water scouring experiments,we can see that in the case of constant flow of water,have litter thickness than haven't litter of the slope production and sediment yield has a significant reduction effect the reduction rate of 1%-1.5%,the litter thickness not only effectively reduce the runoff and sediment yield caused by slope runoff,but also delay the runoff generation on the slope.The delay time in the experiment is about one minute,and the runoff rate is reduced by 1.2%,it's important soil and water conservation effect.(3)The improvement of soil physical and chemical properties of soil slope in soil biological measures has obvious change compared with the original geomorphology.The correlation between the index and Soil anti impact coefficient is obvious,which effectively improves the soil anti-scourability.The soil of the original landform is mainly composed of gravel and gravel.After the soil biological measures is carried out,the vegetation is mainly herbaceous.The root system is distributed in the soil surface,which plays the role of loose and fixed soil,which effectively improves the soil porosity,reduced soil bulk density,optimized soil mechanics,and increased soil organic matter.At present,in the 0-10cm layer,sandy loam is mainly composed,the soil layer is small,porosity is good,suitable for plant community growth,10-20cm soil soil sand content is still high,mainly gravel,through the correlation analysis,it was concluded that the measured soil physical and chemical properties had significant effect on soil impact resistance.