“loess”的概念、定义、翻译、参考文献-科学参考

loess

Statistics

A computationally intensive method for fitting smooth curves or surfaces to a set of data. The procedure fits polynomials (usually linear or quadratic) to local subsets of the data, using weighted least squares so as to pay less attention to distant points. Loess requires no predetermined model for the entire data set, but therefore provides no explicit formula for the smoothed values.

Geology and Earth Sciences

Unconsolidated, wind-deposited sediment composed largely of silt-sized quartz particles (0.015–0.05 mm diameter) and showing little or no stratification. It occurs widely in the central USA, northern Europe, Russia, China, and Argentina. It can give rise to a rugged topography with steep slopes (up to 70°).

Geography

Any unconsolidated, non-stratified soil composed primarily of silt-sized particles. The origin of loess is in dispute. Some writers believe the deposit to be wind-borne (Mason et al. (1999) Geomorph. 28, 3–4); others note the occurrence of the soil in periglacial environments (Pawelec (2006) Geomorph. 74, 1–4) or stress the importance of glacial grinding in the production of silt-sized particles (Sculier et al. (1998) Geomorph. 23, 1). Sweeney (2005) Quat. Res. 63, 3 points to the frequency of dust storms in deserts; Smith et al. (1991) ESPL 16 stress the importance of salt weathering. The loess sequences of north-central China preserve the longest and most detailed record of Quaternary climate change found on land. See Haberlah (2007) Area 39, 2 for a clear and concise summary on loess. Loess is very fertile but very difficult to conserve; soil erosion in most of the Loess Plateau is 5 000–10 000 Mg/km² per year, and 20 000 Mg/km² per year in some places (Chen et al. (2007) PPG 31, 4). See also Cheng (2007) Tillage Res. 94, 1.

单词	loess
释义	loess Statistics A computationally intensive method for fitting smooth curves or surfaces to a set of data. The procedure fits polynomials (usually linear or quadratic) to local subsets of the data, using weighted least squares so as to pay less attention to distant points. Loess requires no predetermined model for the entire data set, but therefore provides no explicit formula for the smoothed values. Geology and Earth Sciences Unconsolidated, wind-deposited sediment composed largely of silt-sized quartz particles (0.015–0.05 mm diameter) and showing little or no stratification. It occurs widely in the central USA, northern Europe, Russia, China, and Argentina. It can give rise to a rugged topography with steep slopes (up to 70°). Geography Any unconsolidated, non-stratified soil composed primarily of silt-sized particles. The origin of loess is in dispute. Some writers believe the deposit to be wind-borne (Mason et al. (1999) Geomorph. 28, 3–4); others note the occurrence of the soil in periglacial environments (Pawelec (2006) Geomorph. 74, 1–4) or stress the importance of glacial grinding in the production of silt-sized particles (Sculier et al. (1998) Geomorph. 23, 1). Sweeney (2005) Quat. Res. 63, 3 points to the frequency of dust storms in deserts; Smith et al. (1991) ESPL 16 stress the importance of salt weathering. The loess sequences of north-central China preserve the longest and most detailed record of Quaternary climate change found on land. See Haberlah (2007) Area 39, 2 for a clear and concise summary on loess. Loess is very fertile but very difficult to conserve; soil erosion in most of the Loess Plateau is 5 000–10 000 Mg/km² per year, and 20 000 Mg/km² per year in some places (Chen et al. (2007) PPG 31, 4). See also Cheng (2007) Tillage Res. 94, 1.
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