Correlation of organic carbon content and annual average precipitation and annual average temperatures based on soil testing and fertilizer recommendation data set
In this paper, based on the soil nutrient data set of the national soil testing and formula fertilization project, the effects of annual mean temperature and annual mean precipitation on soil organic carbon content were studied in the background of global warming. According to the annual average temperature of <5 ℃, 5~10 ℃, 10~15 ℃, 15~20 ℃, >20℃ and annual average precipitation 0~200 mm, 200~400 mm, 400~600 mm, 600~800 mm, 800~1000 mm, 1000~1200 mm, 1200~1400 mm, 1400~1600 mm and>1600 mm, the effects of the average temperature and the annual mean precipitation on soil organic carbon in the second soil survey in each precipitation range during the past 30 years were studied. The results show that:the annual average temperature was less than 10 ℃, greater than 20 ℃, the correlation between soil organic carbon content and annual average precipitation and annual average temperature was very poor. But partial correlation results show that in 10~20 ℃, soil organic carbon content although with annual mean temperature and annual mean precipitation have signifi- cant positive correlation, but increased with the increase of mean annual temperature, that was with the increase in average annual precipitation and increase the fact that covered it. In the range of annual average precipitation 0~200 mm, soil organic carbon had a significant correlation with annual average precipitation, but the average annual precipitation was very poor, the annual average precipitation plays a major role in driving, in the range of 200~400 mm, 400~600 mm and 600~800 mm, the correlation between soil organic carbon and annual average temperature was better than that of annual average precipitation, the annual average temperature plays a major role in driving, especially in the semi humid area of 400~800 mm, the annual average temperature of soil organic carbon was extremely significant, after the annual average precipitation is more than 800 mm, the cumulative effect of annual mean temperature and mean precipitation on soil organic carbon was not significant.