Analysis Of Soil Physical & Chemical Properties & Carbon Storage About Liaotungensi Coummnity In Ziwuling

According to research on the underground layer (soil layer) and upper layer (tree layer, shrub layer, herb layer, litter layer) biomass and analysis of soil properties of natural secondary Quercus liaotungensis in Plateau Area,our objectives were to supply basic datas of Loess Plateau and explored an accuracy method to estimate carbon storage and reveal soil properties. Thus, field survey and laboratory experiment were concluded to study carbon storage and soil properties. The main conclusions as following:1. Two estimate methods were used: integral arithmetic method and method that SOC content were given by layer. Integral arithmetic method verified the accuracy and convenience in estimating the soil storage of forest. The integral arithmetic method could access the SOC perfectly. The SOC storage were 111.938 t/hm², 109.7949 t/hm² under two method.2. By means of allometric scaling models, 75sample trees as basic data of biomass, to build the regression equation among each components biomass, diameter and high, the aim was to estimate the forest biomass and its components in this paper, then calculated the tree layer carbon storage. Tree layer carbon, shrub layer, Herbal layer, the litter layer storage were respectively 53.4529 t/hm²,2.7005 t/hm² ,4.4827 t/hm²,5.2439 t/hm². the soil>the tree layer>the litter layer>the herbal layer>the shrub layer. Fungi can form fungal symbiont with Quercus liaotungensis.3. Soil organic carbon was positively correlated with soil total N(P<0.05,r =0.951). It showed the soil total N decreased with soil depths, this was because that litter layer was the main source of soil organic carbon. The content of soil total P were 0.05%-0.07%, far less than 0.1%. It showed that the total P content of soil supply to the soil were too lack. The total P content were greater in 0-10cm than any other layer. The total P content decreased with soil depths, but this change relatively gentlely under 50cm.The content of available K was 201.8417mg/L in surface soil layer0-10cm, and the content of available K decreased with soil depths.The effective nitrogen mainly in the form of NH₄⁺-N and NO₃^--N, NH₄⁺-N accounted for the major part of soil effective nitrogen. Besides, the content of NH₄⁺-N, NO₃^--N decreased with the soil depths, coefficient of NO₃^--N variation of NH₄⁺-N was higher in 0-10cm than in 10-20cm, but the coefficient of variation of NO₃^--N was lower in 0-10cm than in 10-20cm. Although the content of NO₃^--N was lower than the content of NH₄⁺-N, its CV was significant higher than the CV of NH₄⁺-N. The CV of NH₄⁺-N, NO₃^--N were relatively 19.49%-31.08%, 10.68%-17.79, it showed that NO₃^--N had sensitivity to soil environmental factors. We made correlation analysis between NH₄⁺-N and NO₃^--N, then concluded that there was positively correlation(R=0.774).Soil Ph was one of important characteristics of the soil properties and it was very essential to improve acid soil or alkaline soil. The value of Ph increased with the soil depths from 7.5 to 8.6. Soil Ph value was not significant correlated with available K(r=0.688). The content of soil water was 10%-25%, the content of soil water decreased with soil depths.The content of total N was 5.1326-13.4739 g/kg in litter layer. The content of total N was higher in semi-decomposed layer. The content of total K was 2.7635-6.1778 g/kg, the result showed that the obvious difference occurred between total N and total P. Under-decomposed layer