Soil stoichiometric characteristics of cultivated land in the Sichuan Basin over 40 years
To reveal the distribution and variation characteristics of soil stoichiometry of cultivated land in the Sichuan Basin in China across different temporal and spatial dimensions,the eastern Sichuan Basin was selected as the research area.The contents of total organic carbon,total nitrogen,and total phosphorus and their stoichiometric ratios in soil at different time points(the second soil survey in 1980 and the soil survey in 2021)were analyzed using geostatistical analysis.(1)The semi-variance analysis indicated that the soil stoichiometry of cultivated land in the Sichuan Basin had moderate spatial autocorrelation,influenced by random factors(human factors)and regional structural factors.(2)Compared with the results of the second soil survey,the contents of C,N,and P in the topsoil of the Sichuan Basin increased by 2021:total organic carbon by 72％,total nitrogen by 45％,and total phosphorus by 40％.(3)The spatial and temporal variation of the C/N/P stoichiometric ratio in the Sichuan Basin revealed a similar spatial distribution of soil C/N,C/P,and N/P ratios,being low in the central plain and high in the surrounding areas.In summary,the soil carbon,nitrogen,and phosphorus contents of cultivated land in the Sichuan Basin has generally increased compared with that in the second soil census.However,spatial distribution differences exist.
NETL
NSTL
万方数据
