聊城市典型农业区耕地土壤养分元素地球化学特征
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张文强, 李常锁, 刘金鑫, 程诗悦, 滕跃, 李根林
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Geochemical characteristics of soil nutrient elements in cultivated land within a typical agricultural area, Liaocheng City, China
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ZHANG Wen-Qiang, LI Chang-Suo, LIU Jin-Xin, CHENG Shi-Yue, TENG Yue, LI Gen-Lin
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表2 土壤养分指标等级划分标准
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Table 2 Classification Standards for Soil Nutrient Index Grades
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养分 元素 | 一级 (丰富) | 二级 (较丰富) | 三级 (中等) | 四级 (较缺乏) | 五级 (缺乏) | 上限 值 | | N | >2000 | 1500~2000 | 1000~1500 | 750~1000 | ≤750 | | | P | >1000 | 800~1000 | 600~800 | 400~600 | ≤400 | | | K2O | >3.0 | 2.4~3.0 | 1.8~2.4 | 1.2~1.8 | ≤1.2 | | | SOM | >4.0 | 3.0~4.0 | 2.0~3.0 | 1.0~2.0 | ≤1.0 | | | CaO | >5.54 | 2.68~5.54 | 1.16~2.68 | 0.42~1.16 | ≤0.42 | | | TFe2O3 | >5.30 | 4.60~5.30 | 4.15~4.60 | 3.40~4.15 | ≤3.40 | | | S | >343 | 270~343 | 219~270 | 172~219 | ≤172 | ≥2000 | | B | >65 | 55~65 | 45~55 | 30~45 | ≤30 | ≥3000 | | Mo | >0.85 | 0.65~0.85 | 0.55~0.65 | 0.45~0.55 | ≤0.45 | ≥4 | | Mn | >700 | 600~700 | 500~600 | 375~500 | ≤375 | ≥1500 | | Cu | >29.0 | 24.0~29.0 | 21~24 | 16.0~21.0 | ≤16.0 | ≥50 | | Zn | >84 | 71.0~84.0 | 62~71 | 50~62.0 | ≤50.0 | ≥200 |
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