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Grassland above-ground biomass retrievalinversion method based on high-time resolution and high-spatial resolution multispectral remote sensing data

A technology with high temporal resolution and spatial resolution, which can be applied in measuring devices, analyzing materials, and analyzing materials through optical means, and can solve problems that are difficult to promote

Inactive Publication Date: 2018-06-12
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +1
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Problems solved by technology

The mechanism model has a complete theoretical system, but it involves many inputs, such as soil temperature, humidity, etc., so it can only be calculated near the observatory with related equipment, and it is difficult to extend to the entire area in the actual application process

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  • Grassland above-ground biomass retrievalinversion method based on high-time resolution and high-spatial resolution multispectral remote sensing data
  • Grassland above-ground biomass retrievalinversion method based on high-time resolution and high-spatial resolution multispectral remote sensing data
  • Grassland above-ground biomass retrievalinversion method based on high-time resolution and high-spatial resolution multispectral remote sensing data

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Embodiment Construction

[0017] The calculation process of the grassland aboveground biomass inversion method based on high time resolution and space resolution multispectral remote sensing data in the present invention is as follows: figure 1 shown. The specific introduction of the algorithm principle of this method is as follows:

[0018] 1. Calculation of NPP principle based on light energy utilization rate

[0019] NPP represents the total amount of organic matter that green plants can fix per unit time and per unit area. The light use efficiency model calculates the NPP of the grassland through the absorbed photosynthetically active radiation (APAR) and the effective radiation conversion rate (ε) absorbed by the grassland:

[0020] NPP=APAR(x,t)×ε(x,t)

[0021] In the formula: x is the spatial position, t is the time

[0022] APAR(x, t) represents the photosynthetically active radiation absorbed by the pixel in t months, and the unit is MJ.m -2 .month -1 . ε(x,, t) represents the actual ef...

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Abstract

The invention discloses a grassland above-ground biomass retrievalinversion method based on high-time resolution and high-spatial resolution multispectral remote sensing data. The method comprises thefollowing specific steps: 1) selecting multispectral remote sensing data covering the a grassland growing season, calculating thean NDVI (Normalized Difference Vegetation Index), and synthesizing toobtain the monthly maximum NDVI covering the a research area; 2) interpolating according to the monthly mean temperature, the monthly total precipitation and the monthly total solar radiation data ofa meteorological station, to generate the monthly mean temperature, the monthly total precipitation and the monthly total solar radiation data covering the research area; 3) calculating the NPP (Net Primary Productivity) of the grassland by using a CASA (Carnegie-Ames-Stanford Approach) model based on the LUE (Light Use Efficiency) theory; 4) calculating the above-ground biomass of the grassland according to the NPP and the ratio of the above-ground biomass to the underground biomass.

Description

technical field [0001] The invention relates to the field of ecological index calculation, in particular to a method for calculating the aboveground biomass index of grassland based on remote sensing inversion technology. Background technique [0002] Biomass of plant communities is a comprehensive quantitative feature that reflects the structure and function of ecosystems. Changes in community biomass will affect other processes in ecosystems, such as terrestrial carbon cycle and global climate change. China's natural grassland accounts for more than 40% of the country's land area and is an important part of the terrestrial ecosystem. Therefore, a comprehensive understanding of grassland biomass has important scientific and practical value for long-term monitoring of carbon cycle in grassland ecosystems, assessment of grassland degradation, and rational use and management of natural grasslands. [0003] The calculation methods of aboveground biomass of grassland can be rou...

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Application Information

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IPC IPC(8): G01N21/17
CPCG01N21/17G01N2021/1793
Inventor 袁烨城高锡章李宝林王双孙庆龄张涛蒋育昊
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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