| As soil nutrients,carbon,nitrogen and phosphorus are important indicators to reflect soil fertility and ecological environment risk.Soil carbon,nitrogen and phosphorus eco stoichiometry has rich connotation.It is a tool to study the coupling and balance between multiple elements of ecosystem.Its ratio also plays an indicator role in environmental change.Taking soil carbon,nitrogen and phosphorus eco stoichiometry as the research object,this paper explores the characteristics of soil carbon,nitrogen and phosphorus eco stoichiometry and the influencing factors of soil carbon,nitrogen and phosphorus eco stoichiometry by using the methods of variogram,trend analysis,redundancy analysis,geographic detector and so on;The relationship between eco stoichiometry and the risk level of nitrogen and phosphorus loss in the study area was compared and analyzed,and the eco stoichiometric thresholds of different loss risks were put forward to reveal the indicative role of eco stoichiometry on the risk of soil nutrient loss.The main conclusions are as follows:(1)The size of the soil carbonaceous and nitrogen phosphorus content in the study area is present as orchards>vegetable fields>cultivated land.The differences in various indicators in different types of use are small.Soil organic matter,total nitrogen,and phosphorus in the study area are in moderate variation,and the difference in soil carbon and viper variation in soil in different land use methods is not obvious.Soil organic matter,total nitrogen,and phosphorus semi-variation function model is in moderate variation,and soil organic matter,all nitrogen,and phosphorus are in 0.41km,0.77km,and there is air in the range of 1.68km.Soil organic matter content distribution showed a significant north-south part,and the total nitrogen content of soil has a high degree of similarity.Soil titles are mainly distributed in the north of Dawaishan Town and Liujiadian Town,and the north-south direction presents "U"trend.(2)Soil carbon nitrogen ratio(C:N),carbide ratio(C:P)and nitrogen ratio(N:P)of the study area are 15.16,56.13 and 3.61,respectively,indicating that the organic matter mineralization rate in the study zone is more Soil C:P,N:P is extremely relevant to soil inspiration,which is significantly associated with organic matter and total nitrogen,indicating that the soil C:P,the N:P value is more susceptible to the influence of the soil’s total phosphorus content.Select 10 typical environmental factors for correlation analysis and redundancy analysis,indicating that the water content,speed potassium content,cation exchange and soil pH and ecological chemical measuring correlation are extremely significant and the factor interpretation is high,indicating these four.(3)The areas with high risk of nitrogen and phosphorus loss in the study area are concentrated in orchards and vegetable fields near the river.The eco stoichiometry was clustered according to the risk index of nitrogen and phosphorus loss,and the eco stoichiometry threshold was divided.The risk of nitrogen and phosphorus loss was lower in the areas with C:P>66.53 and N:P>5.48;The areas with C:P<27.01 and N:P<1.78 showed a relatively high risk of nitrogen and phosphorus loss;There is no risk of high nitrogen and phosphorus loss in areas with C:P between 27.01～66.53 and N:P between 1.78～5.48.There is a significant relationship between carbon,nitrogen and phosphorus eco stoichiometry and nitrogen and phosphorus loss risk in space.The interaction between different variables increases the explanatory power of nitrogen and phosphorus loss risk,and the explanatory capacity is the highest after the interaction of C:P and N:P.It is also verified that C:P and C:N can indicate the risk of nitrogen and phosphorus loss.Figure 24 Table 17 Reference 101... |
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