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手测质地,就是通过抓握、挤压、搓捻等方式,感受土壤在不同干湿状态下的可塑性、黏着性、砂砾感、光泽感等,从而确定土壤质地等级。第三次全国土壤普查同时使用发生分类和系统分类。中国土壤系统分类中使用美国农部制质地等级。现介绍一种网上找到的手测美国农部制质地等级的方法,如下:
质地类型 | 土壤润时表现 |
砂土 Sand | 有砂砾感,不粘手,润时也不成球。 Sand has a gritty feel, does not stain the fingers and does not form a ball when moist. |
壤砂土 Loamy Sand | 有砂砾感,粘手(粉粒和黏粒),可形成脆弱的球体,手一拿就破碎。 Loamy sand has a gritty feel, stains the fingers (silt and clay) and forms a weak ball but cannot be handled without breaking. |
砂壤土 Sandy Loam | 有砂砾感,可成球,小心拿起和抓握不会破碎。 Sandy loam has a gritty feel, forms a ball that can be picked up with the fingers and handled with care without breaking. |
粉壤土 Silt Loam | 润时有面粉般的感觉,湿时有黏着性,不能搓捻成带状土条,但能形成可承受一定抓握的球体。 Silt loam has a floury feel when moist and sticky when wet but will not ribbon and forms a ball that will tolerate some handling. |
壤土 Loam | 可能有轻微的砂砾感,但没有指印,可搓捻成0.25-0.50英寸长的短带状土条,形成可被抓握而不致破裂的球体。 Loam may have a slight gritty feel but does not show a finger print and forms only short ribbons of from 0.25 inch to 0.50 inch in length. Loam will form a ball that can be handled without breaking. |
粉土 Silt | |
砂黏壤土 Sandy Clay Loam | 有砂砾感,但含有足够的黏粒,可形成坚固的球体,并可搓捻成0.75-1英寸长的带状土条。 Sandy clay loam has a gritty feel but contains enough clay to form a firm ball and may ribbon to form 0.75 inch to 1 inch long pieces. |
粉黏壤土 Silty Clay Loam | 润时具黏着性,可搓捻成1-2英寸长的带状土条,用拇指指甲刮擦时会产生中等光泽,会产生明显的指印。 Silty clay loam is sticky when moist and will ribbon from one (1) to two (2) inches. Rubbing silty clay loam with the thumb nail produces a moderate sheen. Silty clay loam produces a distinct finger print. |
黏壤土 Clay Loam | 润时具黏着性,可搓捻成1-2英寸长的带状土条,用拇指指甲刮擦时会产生微弱光泽,会产生不明显的指纹。 Clay loam is sticky when moist. Clay loam forms a thin ribbon of one (1) to two (2) inches in length and produces a slight sheen when rubbed with the thumb nail. Clay loam produces a nondistinct finger print. |
砂黏土 Sandy Clay | 润时具可塑性和黏着性,有砂砾感,能形成坚固的球体,搓捻成长度超过2英寸的薄带状土条。 Sandy clay is plastic, gritty and sticky when moist and both forms a firm ball and produces a thin ribbon to over two (2) inches in length. |
粉黏土 Silty Clay | 润时具可塑性和黏着性,没有任何砂砾感,可形成坚固的球体,很容易搓捻成长度超过2英寸的带状土条。 Silty clay is both plastic and sticky when moist and lacks any gritty feeling. Silty clay forms a firm ball and readily ribbons to over two (2) inches in length. |
黏土 Clay | 润时具黏着性和可塑性,能搓捻成长度超过2英寸的薄带状土条,用拇指指甲刮擦时会产生高光泽,可形成坚固而不易破碎的球体。 Clay is both sticky and plastic when moist, produces a thin ribbon over two (2) inches in length, produces a high sheen when rubbed with the thumb nail and forms a strong ball resistant to breaking. |
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