Soil Aggregate Stability and Organic Carbon Response to Different Years of Mulch Planting
In this study,soil samples from a chilli plantation in Xinpu District,Zunyi City,Guizhou Province,with different chilli planting years(0,3,5 and 10 years)were analysed to determine the composition of soil aggregates and soil organic carbon(SOC)content,and it was found that micro-plastic contamination caused by the use of films significantly altered the distribution of aggregates in the soil.The dry sieve results indicated that microplastic contamination from the remaining three groups of film planting resulted in an increase of more than 30%of aggregates with＞2 mm particle size compared to the soil planted with chilli in 0 years.Meanwhile,the wet sieve results showed that the mean weight diameter(MWD)and geometric mean diameter(GMD)of the 0,3 and 5 years mulched planted soils showed a decreasing trend,microplastic contamination reduced the structural stability of the soils,and this negative effect worsened with the increase in the number of years of mulching.In addition,SOC measurements showed that microplastic pollution accelerated the loss of soil organic carbon,resulting in a decrease in SOC content of 5.17 g/kg and 9.08 g/kg in 3 years and 5 years chilli planting soils,respectively.
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