近40年黑龙江省两大平原土壤有机质时空变化规律
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杨贺平, 赵小静, 孙江军
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Spatiotemporal changes of soil organic matter in the Songnen and Sanjiang plains of Heilongjiang Province over 40 years
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YANG He-Ping, ZHAO Xiao-Jing, SUN Jiang-Jun
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表3 1980~2020年黑龙江省两大平原表层土壤(0~20 cm)ΔSOM变化统计
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Table 3 Statistical characteristics of ΔSOM in surface soil (0~20 cm) in the two treat plains of Heilongjiang Province from 1980 to 2020
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| ΔSOM/10-3 | 变化分级 | 两大平原全域 | 松嫩平原 | 三江平原 | | 面积/km2 | 百分比/% | 面积/km2 | 百分比/% | 面积/km2 | 百分比/% | | >40 | 增四级 | 38.3 | 0.01 | 38.3 | 0.02 | 0 | 0 | | 30~40 | 增三级 | 190.8 | 0.07 | 43.9 | 0.03 | 146.9 | 0.16 | | 20~30 | 增二级 | 4607.6 | 1.79 | 1550.9 | 0.95 | 3056.7 | 3.25 | | 10~20 | 增一级 | 26000.7 | 10.09 | 11133.9 | 6.81 | 14866.8 | 15.82 | | -10~10 | 不明显 | 137768.9 | 53.49 | 92388.1 | 56.48 | 45380.5 | 48.28 | | -20~-10 | 降一级 | 68976.7 | 26.78 | 46587.8 | 28.48 | 22388.9 | 23.82 | | -30~-20 | 降二级 | 17273.1 | 6.71 | 9758.0 | 5.97 | 7515.2 | 8.00 | | -40~-30 | 降三级 | 2551.8 | 0.99 | 1923.2 | 1.18 | 628.6 | 0.67 | | ≤-40 | 降四级 | 163.2 | 0.06 | 157.3 | 0.10 | 5.9 | 0.01 |
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