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Alkaline soil space pH value monitoring method based on hyperspectral technology

A hyperspectral and pH technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of immature research and analysis of the temporal and spatial distribution characteristics of alkalized soil and different model accuracy.

Inactive Publication Date: 2017-09-08
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0004] In terms of research status, although a variety of prediction models for various soil components have been established through some hyperspectral data, the accuracy of the models established by different methods is different. The research on alkalized soil with pH as the main index and its temporal and spatial distribution Characteristic research analysis is not yet mature

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  • Alkaline soil space pH value monitoring method based on hyperspectral technology
  • Alkaline soil space pH value monitoring method based on hyperspectral technology
  • Alkaline soil space pH value monitoring method based on hyperspectral technology

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Embodiment Construction

[0024] The present invention as figure 1 As shown, the pH value of the soil samples was determined by a potentiometric titrator. Table 1 shows the statistical characteristics of soil pH in different sampling locations. The soil pH content in different plots varies greatly. The maximum value of the sample appears in plot 4, and the minimum value appears in plot 5. The measurement results are shown in Table 1.

[0025]Table 1 Statistical results of soil sample pH (0-20cm)

[0026]

[0027] Such as figure 2 It can be seen that the soil pH is positively correlated with the original reflectance in the region of 560-2490nm, and negatively correlated in the region of 350-560nm, and the overall correlation coefficients are all low (absolute value less than 0.41). The correlation curve between the reciprocal logarithm of reflectance and soil pH is positively correlated at 350-410nm, and the correlation is between 0.29-0.38, while it is negatively correlated between 1610-1690nm, ...

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Abstract

The invention discloses an alkaline soil space pH value monitoring method based on the hyperspectral technology. Correlation analysis is conducted on the reflectivity of a soil hyperspectral data conversion form and the soil pH value, a stepwise multiple linear regression (SMLR) model and a partial least squares regression (PLSR) model are established, the soil alkalization degree and the space distribution condition are analyzed, the soil quality is evaluated, scientific basis is provided for comprehensive treatment of the soil, and development research is carried out on the basis, so that the hyperspectral monitoring technology of the alkaline soil space pH value can be applied to arid regions and semi-arid regions, and in particular, regions with large terrain fluctuation and unmanned areas can be converted from a monitoring-free mode to a time-by-time space monitoring mode.

Description

technical field [0001] The invention relates to a method for monitoring the spatial pH of alkalized soil using hyperspectral technology, in particular to a method for rapidly monitoring the spatial pH of salinized soil in the field using hyperspectral remote sensing technology, and belongs to the application field of quantitative analysis of remote sensing spectral images. Background technique [0002] Soil alkalization usually occurs in arid and semi-arid areas, and is one of the most important land degradation problems in arid and semi-arid agricultural areas. Therefore, rapid, accurate, and effective monitoring of the degree of harm and spatial distribution of saline-alkali soil plays a vital role in controlling soil salinization, preventing soil re-degradation, and accelerating the development of oasis agriculture. PH is one of the most important indicators to reflect the degree of soil alkalization. The traditional soil alkalization status is obtained through field sur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 王让会蒋烨林李焱吴晓全彭擎
Owner NANJING UNIV OF INFORMATION SCI & TECH
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