青海玛沁县东部表层土壤养分地球化学评价
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张浩, 牛尧, 张海旭, 沙惠兰
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Geochemical evaluation of surface soil nutrients in eastern Maqin County, Qinghai Province, China
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ZHANG Hao, NIU Yao, ZHANG Hai-Xu, SHA Hui-Lan
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表2 土壤大量、中量养分指标等级划分及统计
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Table 2 Classification and statistics of major and secondary nutrient indicators in soil
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| 指标 | 一等 | 二等 | 三等 | 四等 | 五等 | 上限值 | | 丰富 | 较丰富 | 中等 | 较缺乏 | 缺乏 | 超限 | | 有机质 | 含量/(g·kg-1) | >40 | >30~40 | >20~30 | >10~20 | ≤10 | / | | 面积/km2 | 5 260.52 | 514.31 | 330.24 | 170.03 | 24.90 | / | | 比例/% | 83.50 | 8.16 | 5.24 | 2.70 | 0.40 | / | | 全氮 | 含量/(g·kg-1) | >2.0 | >1.5~2.0 | >1.0~1.5 | >0.75~1.0 | ≤0.75 | / | | 面积/km2 | 5 558.47 | 401.26 | 220.06 | 72.39 | 47.82 | / | | 比例/% | 88.23 | 6.37 | 3.49 | 1.15 | 0.76 | / | | 全磷 | 含量/(g·kg-1) | >1.0 | >0.8~1.0 | >0.6~0.8 | >0.4~0.6 | ≤0.4 | / | | 面积/km2 | 2314.64 | 2211.65 | 1475.94 | 281.65 | 16.12 | / | | 比例/% | 36.74 | 35.11 | 23.43 | 4.47 | 0.26 | / | | 全钾 | 含量/(g·kg-1) | >25 | >20~25 | >15~20 | >10~15 | ≤10 | / | | 面积/km2 | 95.50 | 3972.44 | 2223.04 | 9.02 | 0 | / | | 比例/% | 1.52 | 63.05 | 35.29 | 0.14 | 0 | / | | 氧化钙 | 含量/% | >5.54 | >2.68~5.54 | >1.16~2.68 | >0.42~1.16 | ≤0.42 | / | | 面积/km2 | 725.63 | 1633.68 | 3657.91 | 282.78 | 0 | / | | 比例/% | 11.52 | 25.93 | 58.06 | 4.49 | 0 | / | | 氧化镁 | 含量/% | >2.15 | >1.70~2.15 | >1.20~1.70 | >0.70~1.20 | ≤0.70 | / | | 面积/km2 | 253.55 | 2919.31 | 3075.14 | 52.00 | 0 | / | | 比例/% | 4.02 | 46.34 | 48.81 | 0.83 | 0 | / | | 硫 | 含量/(g·kg-1) | >343 | >270~343 | >219~270 | >172~219 | ≤172 | ≥2000 | | 面积/km2 | 4970.30 | 640.71 | 427.68 | 176.66 | 56.65 | 28 | | 比例/% | 78.89 | 10.17 | 6.79 | 2.80 | 0.90 | 0.44 |
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