Study On Small Watershed Soil Reosion Governance Monitoring To The Spatial Distribution Of Soil Nutrients

Soil nutrients is an important material basis for soil fertility, it directly affects the normal crop growth and harvest yield and quality.But in recent years, with the irrational nature of human activities and other factors, resulting in increased eutrophication, soil erosion is more serious and further environmental degradation. In order to guide the regional conservation tillage, dynamic monitoring of soil erosion, soil erosion control, efficient use and environmental effects assessment of soil and water resources, this paper, with field investigation, sampling and laboratory analysis,select Qiaozidong and Qiaozixi watersheds which have different soil erosion,studys in the regulatory effect of soil erosion to the spatial distribution of soil nutrients of small watershed in loess gully region, including the level and profile distribution, and expounds on its guiding significance to production practice in watersheds, reveals between topography and geomorphology factors of effect on soil erosion and spatial distribution of soil nutrients is close relevant.Therefore, enhance soil erosion, for regulating the spatial distribution of soil nutrients of great significance. The main conclusions obtained are as follows:(1) Soil erosion harness to soil nutrients monitoring in the level distribution in Qiaozidong and Qiaozixi watersheds was elucidated.Soil erosion harness extent is differret in the Qiaozidong and Qiaozixi watersheds,the Qiaozidong watersheds has been governanced and the Qiaozixi watersheds untreated. From a different landform, soil type and land use, the paper studys the regulatory effect of soil erosion on the spatial distribution of soil nutrients of Qiaozidong and Qiaozixi watersheds. The study founds that the content of soil organic matters and effective micronutrients on the beam are all high, which shows that the nutrient status on the beam is much better than other soil nutrient status; the content of soil organic matters, total micronutrients Mn and Zn on the loessial soil are high, which shows that loessial soil is better than other types. Soil erosion harness can effectively monitoring soil nutrients distribution pattern in the level,which the content of terraces organic matters, available phosphorus in the Qiaozidong watersheds are more than 30% higher than the Qiaozixi watersheds, and the available phosphorus content ups to 82.68%, which shows that terraces can effectively improve the soil nutrient status.(2) Soil erosion governance to soil nutrients monitoring in the profile distribution in Qiaozidong and Qiaozixi watersheds was expounded.Soil erosion harness to soil nutrients monitoring in the profile distribution in Qiaozidong and Qiaozixi watersheds was studied.The study found, the beam a high content of organic matters and micronutrients, and with little change in soil depth, indicating that the soil nutrient status of the beam in the soil depth in a uniformly varies; the loessial soil nutrients are higher levels, the downward leaching, and accumulated at the bottom, indicating that the loessial soil nutrients are more concentrated in the bottom of the soil, the soil varies unevenly. Soil erosion harness can effectively monitoring soil nutrients distribution pattern in the profile distribution.Which the content of terraces surface organic matters, available phosphorus are higher, but the content of available phosphorus in the ecological forest soil deep, in the Qiaozidong watersheds are the Qiaozixi watersheds, and with the increase of soil depth, indicating that the terraces and ecological forest can respective effectively improve the surface and deep soil nutrient status.(3) Topography and geomorphology in the Qiaozidong and Qiaozixi watersheds to the impact of the spatial distribution of soil nutrients was reveals.The distribution of nutrient elements in soil slope is affected apparently by slope gradient, slope length and slope position. Soil nutrient content increases with the slope length, and the spatial variability of slope is also increased; With the increase in slope, soil nutrient content and spatial variability all increases; Slope position on soil nutrient distribution is also a certain degree of impact, soil nutrients more in slope and the lower enrichment. This Shows the spatial distribution characteristics of soil nutrient is closely related to the landscape factors affecting soil erosion, therefor, Strengthen the control of soil erosion to regulating the spatial distribution of soil nutrients, which has great significance.