A multi-parameter evaluation method for rapid identification of key output areas of soil organic carbon

Abstract

The invention discloses a multi-parameter evaluation method for quick recognition of a critical soil organic carbon output area. The method includes: calculating basin soil organic carbon output parameters, basin soil organic carbon output migration path parameters, basin soil organic carbon output runoff indexes and basin soil organic carbon output precipitation intensity index lattice parameter required by a multi-parameter evaluation model; constructing and applying the multi-parameter evaluation model; comprehensively evaluating according to the model to obtain a final conclusion. The method has advantages that critical processes and main factors which have influences on organic carbon output are considered comprehensively, and simplicity in operation, low data input, high precision and high application and popularization performance are realized. By remote sensing and geographical information system technologies, spatial differences of basin soil organic release potential are well reflected, the defect that in a traditional organic carbon output estimation module, only basin outlet organic carbon output flux is calculated while recognition of a critical soil organic carbon release source area fails is overcome, and important essential data are provided for basin water and soil conservation management, water and soil loss prevention and downstream water eutrophication prevention and remediation.

Description

technical field [0001] The invention belongs to the technical field of comprehensive evaluation of watershed pollutants, and relates to a multi-parameter evaluation method for quickly identifying key output source areas of soil organic carbon. By parametrizing the key process of organic carbon migration, the spatial distribution anomaly map of organic carbon output is delineated , so as to quickly identify and screen a new method related to the abnormality of organic carbon output. Background technique [0002] The export of soil organic carbon in the watershed is one of the important nutrients to maintain the functional health of the terrestrial and aquatic ecosystems. The organic carbon exported to the water body through the land has a great impact on river water quality, heavy metal migration, river ecosystem processes, coastal zone eutrophication and even global carbon. Circulation, etc. have a decisive influence. As the deterioration of water environments such as river...

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Problems solved by technology

However, there is still a gap in the assessment method for the key output source areas of soil organic carbon in the watershed

In addition, there are still many shortcomings in the identification and evaluation of key source areas of non-point source nitrogen and phosphorus nutrients, which can neither be directly applied to my country, nor are they suitable for identifying and evaluating source areas of soil organic carbon output in watersheds.

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