The Study On Eco-hydrological Response Of Vegetation Restoration In The Lazhuwan Catchment, Qingxiushan Mountains

At the background of ecological civilization construction, we should strengthen the ecological management and construction while consider only landscape at landscape planning. In this research, we use different vegetation pattern to simulate eco-hydrological processes at LaZhuwan small watershed quantitatively. Compare eco-hydrological responses from different vegetation patterns of landscape planning. Aim to choose vegetation pattern of optimal eco-hydrological processes for landscape planning at LaZhuwan scenic spot, QingXiushan, NanNing.In this research, we use LaZhuwan small watershed as object of study, use Arc GIS to spatialization vegetation cover and soil distribution, utilize physically-based distributed eco-hydrological model SWAT to stimulate eco-hydrological processes from different vegetation pattern at LaZhuwan. The results are following.The changes of hydrological process mainly reflect at it influenced by precipitation at different time, except soil water, the other hydrological factors are increasing as the precipitation increasing. The peak value of all hydrological factors appears at July which has biggest precipitation. In the planning scheme of returning the grain plots to forestry, the total runoff reduce 6.963mm, dramatically reduce 56.174mm when compared with current vegetation pattern state, soil water increase 37.558mm. The results show that the eco-hydrological response of planed is better than the eco-hydrological response of current vegetation pattern. Compare different adjustment schemes with planning schemes, remain green area, change forestland area, the first adjustment scheme show 1.624 mm reduce of total runoff, the second adjustment show 1.199 mm increase of total runoff, the third adjustment show 0.575 mm of total runoff.The space change of different vegetation patterns mainly reflect in the space distribution change of vegetation cover types. Results show that:sub-catchment 3 has biggest total flow which is 1897.83mm, the number of runoff is irrelevant with area of drainage basin, the distribution of different vegetation patterns is relevant with area of drainage basin. In the first adjustment scheme, the sub-catchment has the biggest runoff, which is 1897.331mm. The area of coniferous forest increase in the first and the second, the area of mingled forest reduce, which bring increasing of total runoff, which means the coniferous forest lead to more runoff than mingled forest. The sub-catchment 3 has biggest runoff in the second adjustment scheme, which is 1897.769mm. The sub-catchment 1,3,5 have increased area of grassland and reduced broad-leaved forest, which lead to reduce of total runoff. The result show that the grassland has greater evaporability, weaker soil water storage capacity, weaker capacity of reducing surface runoff and weaker capacity of produce runoff. The sub-catchment 2 from the third adjustment has the biggest runoff, which is 1897.331mm. The order of producing runoff capacity is coniferous forest bigger than mingled forest bigger than broad-leaved forest bigger than grassland.In conclusion, analyzing to the eco-hydrological responses of different vegetation patterns change, the generated eco-hydrological responses is accordant: planning scheme is better than current vegetation pattern, the second adjustment scheme has the best eco-hydrological effect in the planning scheme and all the adjustment schemes, the adjustment 3 is the second-best, the adjustment 1 lead to weakest eco-hydrological effect.