Spatial And Temporal Distribution Characteristics And Influencing Factors Of NPP In Shandong Province

Net Primary Productivity(NPP)is an important component of terrestrial ecosystem carbon cycle.As an important carbon pool,vegetation NPP is becoming a research hotspot under the background of global climate change.Studying the temporal and spatial distribution and change characteristics of vegetation NPP can provide scientific basis for regional ecological environment assessment and construction.Taking Shandong Province as an example,based on the data of MOD 17A3 vegetation NPP data,temperature and precipitation from 2000 to 2014,using anomaly analysis,trend analysis,correlation analysis and other methods,temperature and precipitation were studied on the regional and pixel scales.The impact of provincial net primary productivity.The main conclusions are as follows:(1)The range of vegetation NPP in Shandong Province from 2000 to 2014 was 327.08?450.34 g/(m2·a),the lowest value appeared in 2000,the highest value appeared in 2004,and the average value was 396.31 g/(m2 a).The growth rate is 5.70g/(m2·a),which is generally fluctuating.(2)The variation coefficient of vegetation NPP in Shandong Province is between 0.027 and 0.864,with an average of 0.11.The vegetation in most parts of the province is relatively stable and the NPP fluctuation is small.(3)The Hurst index of vegetation NPP in Shandong Province is between 0.14 and 0.97,with an average of 0.53.The NPP in 62.6%region shows strong persistence characteristics.Combined with linear tendency value analysis,62.5%of regional NPP will increase in the future.(4)The spatial distribution of vegetation NPP in Shandong Province is significantly different,generally higher in the east and lower in the west,and decreases from the coastal area to the inland;(5)Vegetation NPP is affected by hydrothermal conditions and is positively correlated with temperature and precipitation,and the impact of precipitation is more significant.(6)The area where precipitation-temperature superposition and vegetation NPP significantly correlated(P<0.05)accounted for 10.6%of the total area.Overall,the non-temperature-precipitation impact area occupies most of the area of Shandong Province,indicating that the impact of human activities dominates the area;...