The Impacts of Tourism Development on Soil Nutrients and Physical Properties in Ruoergai Plateau Wetland Nature Reserve,Sichuan,China

Researches were conducted on tourism development intensity of soil nutrients and physical properties of Ruoergai Plateau Wetland National Nature Reserve.The results of the study showed that:(1) Soil nutrient contents of the Flower Lake scenic area of the Ruoergai Plateau Wetland(organic matter,nitrogen,phosphorus,and potassium) influenced by different tourism development in strength(strength grade)were quite different.(2) Different tourism development intensity on soil physical and chemical properties was as follows:with the increased intensity of grazing disturbance,soil bulk density of samples gradually increased,and porosity decreased.Soil water-holding capacity and water content declined because of interference.The water holding capacity and water content under moderate and severe interference significantly decreased as compared with the non-interference of soil grazing(P0.05).Soil compaction caused by grazing caused the surface porosity to decrease,as well as the primary infiltration rate and steady infiltration rate of soil to decline.And the declining of the steady infiltration rate was the most obvious.The steady infiltration rate of soil under moderate and severe grazing disturbances decreased by 49.81%,81.89% and 92.34% respectirely as compared with no grazing.(3)Tourism activities,over-grazing overload activities and other anthropogenic interference were the main reasons for causing ecological degradation.The cold weather constrained the utilization of soils.The vegetation had slow growth and was difficult to recover when it was destroyed.A large number of water loss and the resultant loss of wetland functions had a significant impact on the formation and evolution of Ruoergai region and its vicinity as well as the global ecological environment.The natural ecological environment of Ruoergai Wetland should be protected.Trenching,drainage and excessive disorderly tourism should be strictly prohibited,some important measures should be taken to conserve Ruoergai wetland's soil and its plateau's ecological environment.Only in this way,the protection of soil ecosystem had support and material basis.