Characteristics and Driving Mechanism of Soil Organic Carbon Content in Farmland of Beijing Plain: Implication for the Fate of Engineered Polymers in Soil

Table 1

Characteristic statistical values of SOC for different years.

Years	Number of samples	Mean/g⋅kg^−1	Standard deviation/g⋅kg^−1	Rang/g⋅kg^−1	Wp
2010	136	10.699b	4.205	27.320	0.100
2011	137	10.869ab	3.681	21.920	0.534
2012	129	10.475b	4.925	32.175	0.310
2013	123	11.485a	4.913	33.991	0.183
2014	104	11.586a	4.706	35.325	0.120
2015	91	12.078a	5.659	33.933	0.077