SoilQuality Evaluation of Camellia oleifera Abel.Forests in Guizhong Region Based on Minimum Data Set
Camellia oleifera Abel.is one of the important woody plant oilseeds in China,which is crucial for the country to maintain the national edible oil security.However,Camellia oleifera Abel.suffers from low yield,and related studies have shown that this may be related to soil nutrients and their stoichiometric ratios.In order to im-prove the yield of Camellia oleifera Abel.and to study the limiting factors of soil quality and yield,this paper aims to provide a reference for rational fertilization through the minimum data set method and stoichiometric rati-o.Five counties and cities in the main production area of Camellia oleifera Abel.in Guizhong were selected to de-termine 25 physicochemical and enzyme activity indexes of the soil,and the physicochemical,microbiological and its stoichiometric ratio characteristics of Camellia oleifera Abel.soil were analyzed by using principal component analysis and other methods.The soil quality evaluation index(SQI)was used to evaluate the soil of Camellia ole-ifera Abel.forests in Guizhong region.The results showed that SOC,TN,NH4+-N,NO2-N,AS,and ACP had the highest values in high-yield forests.On the contrary,TP,AK,AB,and AMn were lower in low-yield forests.The mean values of soil C∶N,C∶P,and N∶P in Guizhong region were lower compared with the mean values of soil C∶N,C∶P,and N∶P in subtropical Camellia oleifera Abel.soils,whereas soil C∶N,C∶P,and N∶P in low-yield forests were significantly higher than those in high-yield forests.A total of six indicators,SOC,TN,TP,AK,ACu and AMo,were selected to establish the MDS,and SOC had the highest weight,and the soil quality was ranked as HYS＞MYS＞LYS,with SQI values of 0.683,0.487,and 0.370,respectively.The SQI was significantly and positively correlated with the yield(R2=0.93).Soil SOC is one of the limiting factors for low-yield forests of Camellia oleifera Abel.in Guizhong region,and it is relatively deficient in AK and AB,which are more obviously limited by P.
Camellia oleiferaoil yieldsoil stoichiometric ratiominimum data setsoil quality index
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