Research On Eco-Hydrological Effects Of The Seabuckthorn Plant Flexible Dam In The Soft Rock Region

The Loess Plateau is one of the most serious soil erosion region in the world, and is also vulnerable eco-geology region, so to keep the resource of the soil and the water in this region, promote the region developing in sustainable and ensure the downstream of the Yellow River safety are the questions urgently to be solved in this region. And it is the root way to harness the sediment of the gullies by making use of the biology-project to reconstruct the nature environment. Seabuckthorn not only has good effects in conserving water and soil, preventing wind, improving soil nutrient, showing the nice characteristic of adaptability which can live in drought and poor environment, resist saline-alkali, heavy cold and hot, but also has high value in economy, so to develop seabuckthorn forest in the vulnerable eco-geology region has very important significance in ameliorating the eco-environment, developing the area economy and making the sociality and economy developing in sustainable.This paper based on the field investigating and the experiments in laboratory on the planted seabuckthorn flexible dam in Xi'zhao watershed in Inner Mongolia of China, carries out the researches from ecology angle for the technique of seabuckthorn plant flexible dam; and then exploring the hydrological effects of the soil reservoir in regulating water resource and the ecology effects changing soil texture and vegetation cover etc. which are brought after planted seabuckthorn flexible dam; at last concisely analyzed the influence of developing agriculture and stockbreeding in the mode of harnessing gully by planted seabuckthorn flexible dam.By hereinbefore analyzing and studying mainly obtains follow achievements:(1) Analyzed the deformation of the seabuckthorn flexible dam in botanical terms from the direction of longitudinal, transverse and vertical (the same as deformation on the length, width and height of the seabuckthorn flexible dam), and obtained the conclusions about the length, width, and height of the seabuckthorn flexible dam deformation;(2) Investigated and estimated the cumulate sediment quantum in the seabuckthorn flexible dam in 10 years; then analyzed the buildup of the gradation of grain in sediment of seabuckthorn flexible dam,confirmed again that the seabuckthorn flexible dam can effectively separate the coarse particle soil, and also found that the grain size of soil deposited in seabuckthorn flexible dam in different period is different, the clast is coarse in early period when sediment forming after seabuckthorn planted, and is fine in the later days;(3) Analyzes the regularity that the soil water content rater changing by the soil depth after raining in the gully channel planted with seabuckthorn, and then compares the soil water content rate with the gully not planted, discovers that the seabuckthorn plant flexible dam has a notably good effect at adjusting water resource; based on analyzing the change of soil moisture from the sediment at upstream of flexible dam to the downstream discovers the trend that the section average soil moisture in longitudinal direction is reducing; found the linear relation between section average soil water content rate(4) By compared the soil organic matter content in the gully planted flexible dam with that in the gully not reclamation, finds that the former one is much higher than the latter one, so confirms that the seabuckthorn flexible dam have the ecological effects of improving soil organic matter content and soil fertility in the gullies; by the mensuration of soil organic matter content finds that the soil organic matter mainly centralizing in surface soil layer, the soil organic matter content showing a linear changing which the soil organic matter content increases gradually from upstream to downstream in the longitudinal direction, and this rule is similar to the sediment thickness changing rule in the seabuckthorn plant flexible dam.