The Influence Of Tiny Terrain To Herb Layer Of Elm Woodland

Hunshandake Sandy is one of the top four desert in our country. In recent years along with environmental degradation, desertification increasingly serious, the sandy desert vegetation has become a hot research. This article studied the herb in universal height and direction of elm woodland Hunshandake Sandy. Analysis of sand dunes under different slope direction, slope of herbaceous vegetation biomass, the quantity characteristics change, soil nutrient change. Final analysis of coupling between soil nutrients and herbaceous biomass, coverage. The results are as follows:(1) Showing significant differences dune herbaceous layer biomass and coverage under the aspect impact factor (P<0.05), and leeward slope herbaceous biomass and coverage are higher than the windward. Herbaceous layer biomass and coverage under different slope positions was uphill greater than the downhill. Windward is downhill> midhill>uphill, and leeward is midhill>downhill>uphill. Biomass and coverage was positively correlated, and biomass and coverage of the windward was significant positive correlation.(2) From the research we found that windward to Corispermum was the dominant species and leeward to Carex was the dominant species.(3) Dune leeward soil nutrient content and moisture content was significantly higher than the windward and the difference was significant (P<0.05). Soil nutrients and moisture were significant migration and accumulation to downward slope. The transformation of organic matte is closely related to the cycle of nitrogen, and influence each other. Nitrogen for the most profound impact on organic. Regression analysis showed that by measuring soil nitrogen, we can calculate the organic matter content with high credibility. Windward regression model:G=-3730.031+227.535N (R2=0.873),Leeward regression model:G=-6561.735+270.715N (R2=0.722)(4) By the coupling relationship between herbaceous cover and biomass and soil nutrients and moisture, we found windward herbaceous cover and soil moisture content was significantly positively correlated (r=0.729、r=0.668). There has not particularly significant relationship between leeward herbaceous cover and soil moisture content and physicochemical properties. Leeward slope habitats favorable complex to produce comprehensive coverage on herb. Dune soil moisture and herbaceous biomass has a significant positive correlation, and the impact was significant. Description the moisture has greatest impact on the growth of herbaceous layer.