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Table 1 Various characteristics of the four typical Chinese rice-growing regions

From: The chemodiversity of paddy soil dissolved organic matter correlates with microbial community at continental scales

  Hani Terrace Taihu Plain Sanjiang Plain Lianghu Plain
Administrative region Yunnan Province. Jiangsu, Zhejiang, Anhui Provinces, and Shanghai Municipality Heilongjiang Province Hunan and Hubei Provinces
Longitude range 100°55′27″–103°14′57″ 118°38′12″–121°47′48″ 130°12′45″–134°8′45″ 111°50′51″–114°48′12″
Latitude range 22°46′44″–24°28′13″ 30°3′19″–31°56′15″ 45°16′53″–48°2′40″ 28°34′7″–31°16′21″
Climate 3-D climate, (sub)tropics subtropics temperate subtropics
Elevation (m) 350–3000 0–45 50–160 10–100
Rice cultivation history ~ 1200 years ~ 5000 years ~ 60 years ~ 4000 years
Rice cultivars (Oryza sativa L.) [89] Most are japonica Half are indica and half are japonica All are japonica Most are indica
Cultivation method traditional modern and small-scale modern and large-scale modern and medium-scale
Mean pH 6.07 ± 0.60 6.60 ± 0.70 6.32 ± 0.32 6.80 ± 0.68
Mean annual temperature (°C) 16.21 ± 1.77 15.66 ± 0.41 2.85 ± 0.78 16.68 ± 0.35
Mean annual precipitation (mm/d) 3.20 ± 0.19 3.74 ± 0.19 1.86 ± 0.13 3.45 ± 0.29
Dissolved organic carbon (mg/ml) 23.51 ± 6.84 31.68 ± 11.41 29.28 ± 8.39 31.61 ± 14.40