Temporal and spatial variation characteristics of available Cu in tobacco planting soil in Xiangxi state

doi:10.14088/j.cnki.issn0439-8114.2019.20.014

Abstract

Abstract: The descriptive statistical characteristics and temporal and spatial variations of available copper in tobacco soils in Xiangxi state（western Hunan） were analyzed by classical statistics and geostatistics based on the data of soil samples collected in 2000 and 2015, and there were 446 soil samples in 2000 and 1 242 soil samples in 2015. The results showed that the average content of available copper in tobacco-growing soils in western Hunan increased from 1.05 mg/kg to 1.89 mg/kg in the past 15 years, with an increase of 80%. However, the distribution frequency of available copper in soil samples of different grades changed greatly. Compared with 2000, the ratio of samples of suitable grade of soil available copper in 2015 was higher. The number of cases decreased by 32.35 percentage points. At the same time, the proportion of extremely low, low, high and extremely high grade samples increased by 1.93, 1.49, 12.00 and 16.93 percentage points, respectively, indicating that the soil available copper content in tobacco growing areas increased at the same time, showing the characteristics of two-stage differentiation. From the perspective of spatial and temporal variability, the nugget effect of available copper in soil has increased in the past 15 years, and the random factors have enhanced the spatial variability of available copper in soil, and the fractal dimension of available copper in soil has decreased, which indicates that available copper has more large-scale variability characteristics. In terms of spatial and temporal distribution, the area of high and extremely high soil available copper content increased significantly in 2015, increasing 33.94% and 10.94%, respectively, while the suitable soil copper content decreased significantly, by 45.01% compared with 2000.

Key words: Xiangxi state, tobacco planting soil, available Cu, spatio-temporal variability

CLC Number:

S572
S153.6

TIAN Ming-hui, XIANG De-ming, YAN Chen-bing, TIAN Mao-cheng, ZHANG Li-ming, LI Qiang. Temporal and spatial variation characteristics of available Cu in tobacco planting soil in Xiangxi state[J]. HUBEI AGRICULTURAL SCIENCES, 2019, 58(20): 68-71.

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