袁大刚分享 http://blog.sciencenet.cn/u/dgyuan 土壤形成与环境演变、土壤分类与参比

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一种手测美国农部制质地等级的方法

已有 2325 次阅读 2023-3-19 00:07 |系统分类:科研笔记

    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,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.

壤土

Sandy Loam

有砂砾感,可成球,小心拿起和抓握不会碎。

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

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

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

时具黏着性搓捻成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

可塑性和黏着砂砾,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

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,形成坚固不易破碎的球

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.

原文:Field Guide to Soil Texture Classes (USDA) Introduction-The Purpose of This Test Is to Provide a Standard Procedure for Estimating Soil Texture in the Field - DocsLib



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