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Table S1 Description of the sampling sites information for the sixty main soil profiles

Soil core code / Sampling location / Longtitude / Latitude / Soil type / Land using
1.  Sampling sites in the Yangtze River Delta region
SEBC01 / Nanjing, Jiangsu Province / 118.7394 / 31.9082 / Udic Luvisols / upland
SEBC02 / Nanjing, Jiangsu Province / 118.8667 / 32.0667 / Udic Luvisols / upland
SEBC03 / Changzhou, Jiangsu Province / 119.9000 / 31.6833 / Stagnic Anthrosols / upland
SEBC04 / Wuxi, Jiangsu Province / 120.4667 / 31.5833 / Stagnic Anthrosols / uncultivated
SEBC05 / Suzhou, Jiangsu Province / 120.5167 / 31.9500 / Aquic Cambisols / uncultivated
SEBC06 / Suzhou, Jiangsu Province / 120.6833 / 31.5333 / Stagnic Anthrosols / vegetable
SEBC07 / Suzhou, Jiangsu Province / 120.7338 / 31.0881 / Stagnic Anthrosols / vegetable
SEBC08 / Hangzhou, Zhejiang Province / 119.4370 / 30.3426 / Perudic Cambisols / upland
SEBC09 / Hangzhou, Zhejiang Province / 119.4811 / 30.3163 / Udic Luvisols / upland
SEBC10 / Hangzhou, Zhejiang Province / 120.0892 / 30.1797 / Udic Luvisols / upland
SEBC11 / Shaoxing,Zhejiang Province / 120.6346 / 30.0013 / Stagnic Anthrosols / vegetable
SEBC12 / Ningbo, Zhejiang Province / 121.2922 / 30.2593 / Aquic Cambisols / paddy field
SEBC13 / Zhoushan, Zhejiang Province / 122.3946 / 29.8727 / Udic Ferrisols / upland
SEBC14 / Taizhou, Zhejiang Province / 121.1957 / 28.8758 / Stagnic Anthrosols / paddy field
SEBC15 / Wenzhou, Zhejiang Province / 121.0458 / 28.2171 / Stagnic Anthrosols / paddy field
SEBC16 / Wenzhou, Zhejiang Province / 121.0588 / 28.1634 / Stagnic Anthrosols / paddy field
SEBC17 / Huzhou, Zhejiang Province / 120.1853 / 30.7270 / Stagnic Anthrosols / paddy field
SEBC18 / Jiaxing,Zhejiang Province / 120.9279 / 30.4880 / Aquic Cambisols / paddy field
SEBC19 / Jiaxing,Zhejiang Province / 120.7191 / 30.8335 / Stagnic Anthrosols / paddy field
SEBC20 / Shanghai / 121.8636 / 31.0262 / Aquic Cambisols / paddy field
SEBC21 / Shanghai / 121.5038 / 31.6689 / Aquic Cambisols / vegetable
SEBC22 / Nantong, Jiangsu Province / 121.7648 / 31.7491 / Aquic Cambisols / cotton field
SEBC23 / Nantong, Jiangsu Province / 121.3332 / 31.9259 / Aquic Cambisols / vegetable
SEBC24 / Zhenjiang, Jiangsu Province / 119.1953 / 32.1547 / Stagnic Anthrosols / paddy field
SEBC25 / Huzhou, Zhejiang Province / 119.9003 / 30.5933 / Stagnic Anthrosols / paddy field
SEBC26 / Suzhou, Jiangsu Province / 120.9009 / 31.5988 / Stagnic Anthrosols / paddy field
SEBC27 / Taizhou, Jiangsu Province / 120.1841 / 32.0286 / Aquic Cambisols / paddy field
SEBC28 / Taizhou, Jiangsu Province / 120.2738 / 32.2738 / Stagnic Anthrosols / paddy field
SEBC29 / Yangzhou, Jiangsu Province / 119.4372 / 32.5593 / Stagnic Anthrosols / paddy field
SEBC30 / Yangzhou, Jiangsu Province / 118.6767 / 31.9961 / Stagnic Anthrosols / paddy field
2.  Sampling sites in the Pearl River Delta region
SEBC31 / Guangzhou, Guangdong Province / 113.6648 / 22.6541 / Sandic Entisols / uncultivated
SEBC32 / Huizhou, Guangdong Province / 114.43365 / 23.33002 / Udic Ferralsols / upland
SEBC33 / Huizhou, Guangdong Province / 114.22091 / 23.27255 / Stagnic Anthrosols / paddy field
SEBC34 / Guangzhou, Guangdong Province / 113.81046 / 23.20686 / Stagnic Anthrosols / paddy field
SEBC35 / Dongguan, Guangdong Province / 113.74413 / 23.09254 / Stagnic Anthrosols / paddy field
SEBC36 / Shenzheng, Guangdong Province / 113.96046 / 22.7586 / Udic Ferralsols / upland
SEBC37 / Guangzhou, Guangdong Province / 113.46474 / 23.11921 / Stagnic Anthrosols / orchard
SEBC38 / Guangzhou, Guangdong Province / 113.51881 / 23.15756 / Udic Ferralsols / upland
SEBC39 / Guangzhou, Guangdong Province / 113.23926 / 23.42885 / Stagnic Anthrosols / paddy field
SEBC40 / Qingyuan, Guangdong Province / 112.99764 / 23.63245 / Stagnic Anthrosols / paddy field
SEBC41 / Foshan, Guangdong Province / 112.89313 / 23.26898 / Udic Ferralsols / orchard
SEBC42 / Foshan, Guangdong Province / 113.01316 / 22.95368 / Anthric Entisols / vegetable
SEBC43 / Guangzhou, Guangdong Province / 113.3868 / 22.91105 / Stagnic Anthrosols / cornfield
SEBC44 / Zhaoqing, Guangdong Province / 112.55053 / 23.22665 / Udic Ferralsols / upland
SEBC45 / Zhaoqing, Guangdong Province / 112.62714 / 23.04425 / Stagnic Anthrosols / paddy field
SEBC46 / Foshan, Guangdong Province / 112.83785 / 22.87251 / Stagnic Anthrosols / paddy field
SEBC47 / Jiangmen,Guangdong Province / 112.95638 / 22.73408 / Stagnic Anthrosols / paddy field
SEBC48 / Jiangmen,Guangdong Province / 113.08205 / 22.5202 / Stagnic Anthrosols / paddy field
SEBC49 / Zhongshan, Guangdong Province / 113.44042 / 22.48385 / Udic Ferralsols / upland
SEBC50 / Zhuhai, Guangodng Province / 113.52512 / 22.31628 / Udic Ferralsols / upland
SEBC51 / Zhuhai, Guangodng Province / 113.38929 / 22.38929 / Orthic Halosols / paddy fields
SEBC52 / Guangzhou, Guangdong Province / 113.593 / 22.65483 / Stagnic Anthrosols / paddy fields
SEBC53 / Dongguan, Guangdong Province / 113.60736 / 22.95107 / Stagnic Anthrosols / paddy fields
SEBC54 / Dongguan, Guangdong Province / 113.5704 / 23.03371 / Stagnic Anthrosols / orchard
SEBC55 / Jiangmen,Guangdong Province / 112.67074 / 22.40384 / Udic Ferralsols / upland
SEBC56 / Jiangmen,Guangdong Province / 112.99766 / 22.13511 / Udic Ferralsols / upland
SEBC57 / Jiangmen,Guangdong Province / 112.38194 / 22.24004 / Udic Ferralsols / vegetable
SEBC58 / Huizhou, Guangdong Province / 114.3177 / 22.85257 / Stagnic Anthrosols / vegetable
SEBC59 / Huizhou, Guangdong Province / 114.29595 / 23.04986 / Stagnic Anthrosols / paddy fields
SEBC60 / Shaoguan, Guangdong Province / 113.81058 / 24.46276 / Stagnic Anthrosols / paddy fields