Effects Of Degradation On Meadow Soil Nutrient Limiting Factors And Vegetation Biomass Of Wugoag Mountain

Wugong Mountain in the west of Jiangxi, the highest of1918.3m, because of itsspecial meadow landscape, Wugong Mountain listed as "national geological park" in2005.In recent years, with the expansion of tourism scale and the extension of tourists runrange. It has caused the degradation of meadow community composition and productivityof Wugong Mountain largely, which lead to the destruction of ecological landscape. Sorational use the meadow tourism resources, improving the degraded meadow is the path tosolve the sustainable development issues of Wugong Mountain. this paper adopted soilnutrients systematic approach (ASI) to evaluate and analyze aboveground biomass and soilnutrient limiting factors of non-degraded and degraded land respectively, under threedifferent altitudes of Wugong Mountain, aiming to explore the relationship between soilnutrient status and vegetation biomass, to provide a theoretical basis for nutrientmanagement and the choice of grass during the meadow recovery process of WugongMountain. The results were as follows:(1)The not degraded soil of Jiangxi Wugong Mountain meadow land is acidic, highwith organic matter content. Nutrient deficiency of not degraded soil is widespread serious.There is also a lack of other nutrients in varying degrees,except for Mg, Fe, S element.The degraded land has a low content level of organic matter. The content of other elementswas lower than that of non-degraded (CK) soil, in addition to Ca elements, which Leads toan increase of Ca content in soil and a reduce of content of N, P, K and trace elements.Thehigher of the altitude, the more of the soilN,P,K,Mg,Zn content. There was the highestlevel of soil Fe element content in. moderate elevation.(2) Meadow degradation altered the absorption fixed capacity of soil to some nutrients,the three altitudes of degraded soils had a greater adsorption capacity of K, P, B than thatof CK soil. The capacity of adsorption to each element was strong in degradation soil inmedium altitude.The order of the strength of soil adsorption fixed capacity of the variouselements of CK block in elevation of1850m is P> Zn> S> Mn> Cu> K> B, while that ofdegraded soil is P>B>K>S; The order of the strength of soil adsorption fixed capacity ofthe various elements of CK block in elevation of1750m is P>S>Zn>Cu>Mn>K>B, whilethat of degraded soil is Zn>P>Mn>K>B>Cu>S; The order of the strength of soiladsorption fixed capacity of the various elements of CK block in elevation of1650m is P>Zn>S>Mn>Cu>K>B, while that of degraded soil is P>Zn>Mn>K>B> Cu>S;（3）There was a serious lack of P and Ca elements in Wugong mountain meadowsoil. There were more soil nutrients limiting factors high altitude in high, medium altitudedegraded areas degraded areas than that of the non-degraded areas.The major nutrientlimiting factors of CK in elevation of1850m were Ca, K, P and it’s deficiency order is Ca> K> P, while the sequence of nutrient deficiency of degraded land is B>P>Ca>N; The majornutrient limiting factors of CK in elevation of1750m were Ca, P,N,K and it’s deficiencyorder is Ca>P>N>K, while the sequence of nutrient deficiency of degraded land is Ca>P>B>Zn>N; The major nutrient limiting factors of CK in elevation of1650m were Ca, P, K,Mo and it’s deficiency order is Ca＞P＞K>Mo, while the sequence of nutrient deficiencyof degraded land is Ca>P>Zn. From the above results we know that there was a seriouslack of elements P and Ca in Wugong Mountain meadow soil.(4)The plants, in the investigated sample plots, have been identified under12familiesand28species and the dominant specie is Gramineae five mango festival. From the pointof view of different altitudes, CK plots in elevation of1850m (high altitude) had themaximum total biomass. The degraded land in elevation of1750m (in elevation) had themaximum total biomass, which explained that the high altitude lands degraded severelyand the in altitude lands had less interference.(5) Suitable for the growth of the vegetation biomass of soil pH between4.5~4.8, soilbulk density and had a significant positive correlation with available P, total nitrogen; Thevegetation biomass Wugong Mountain didn’t have a significant correlation with organicmatter content. CK plots in high altitude had a high level of vegetation chlorophyll content;plots in high and low altitude subjected with larger anthropogenic interference.