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Remote sensing estimation method and remote sensing estimation model building method of SPAD value of whole-growth-period cotton canopy

A technique for estimating models throughout the growth period, applied in calculations, instruments, data processing applications, etc., can solve problems such as seldom seen in the research of chlorophyll content in cotton canopy leaves

Inactive Publication Date: 2017-03-08
NORTHWEST A & F UNIV
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Problems solved by technology

Domestic research areas on cotton are mainly concentrated in the arid areas of Xinjiang in my country [9-11] , but there are very few studies on the chlorophyll content of cotton canopy leaves in the dry plateau area of ​​Weibei

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  • Remote sensing estimation method and remote sensing estimation model building method of SPAD value of whole-growth-period cotton canopy
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  • Remote sensing estimation method and remote sensing estimation model building method of SPAD value of whole-growth-period cotton canopy

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Embodiment Construction

[0037] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] 1 Materials and methods

[0039] 1.1 Overview of the study area

[0040]The experiment was carried out in Sanhe Village, Liangshan Township, Qianxian County, Weibei dry plateau area from 2014 to 2015 (108°00′13″E~108°24′18″E, 34°19′36″N~34°45′05 ″N), the local area belongs to the warm temperate semi-arid and semi-humid continental monsoon climate, with an annual precipitation of 550-730mm, rain and heat in the same season, and the threat of drought is great. Severe soil erosion leads to soil barrenness, making the agricultural foundation particularly weak and seriously restricting the sustainable development of agriculture. The previous crop cotton in the study area was Lumianyan 28. The present invention designs 46 experimental plots, and the size of the plots is 5m*6m. Cotton is planted in ridges covered with plastic film.

[0041...

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Abstract

The embodiment of the invention discloses a remote sensing estimation method and remote sensing estimation model building method of an SPAD value of a whole-growth-period cotton canopy. The cotton planted in the Hanyuan area of the Weihe river is taken as a test material; the SPAD value of the whole-growth-period cotton canopy and a canopy reflectance spectrum are measured; correlation analysis is carried out on original hyperspectral reflectance, first-order differential spectral reflectance and remote sensing spectrum parameters combined by different wavebands and the SPAD value separately; an SPAD prediction model of five important spectrum parameters is built; meanwhile, a full-spectrum SPAD estimation model is built by adopting PLSR and check is carried out; and the model with the highest precision is finally screened out. A full-spectrum PLSR model built on the basis of important spectral variables monitors the SPAD value of the cotton by using a hyperspectral technology; the prediction effect is significant; a basis can be provided for remote sensing monitoring of whole-growth-period cotton growth; and a positive guiding role in guidance of cotton cultivation and production is put into play.

Description

technical field [0001] The present invention relates to the field of cotton detection, and more specifically, the present invention relates to a method for remote sensing estimation of cotton canopy SPAD (abbreviation of "Soil and Plant Analyzer Development", Soil and Plant Analyzer Development) value and estimation model construction method during the whole growth period of cotton. Background technique [0002] Chlorophyll is the most important pigment in plant photosynthesis, and it is also an important substance for energy exchange between plants and the outside world. Chlorophyll content is closely related to plant photosynthetic capacity, developmental stage and nitrogen status, and has become an effective means to evaluate plant growth, and is of great significance to the real-time monitoring of plant chlorophyll content [1] . The SPAD value is a relative chlorophyll content reading that can be used as the chlorophyll content per unit area of ​​the plant [2] . Usual...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 常庆瑞刘梦云高义民
Owner NORTHWEST A & F UNIV
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