CN-122022358-A - Soil organic carbon increment and erosion emission reduction cooperative evaluation method for slope-to-ladder measure

CN122022358ACN 122022358 ACN122022358 ACN 122022358ACN-122022358-A

Abstract

The invention discloses a soil organic carbon increment and erosion reduction cooperative assessment method for slope modification ladder measures, which relates to the technical field of water and soil conservation assessment and comprises the following steps of registering a terrace space distribution base map, a digital elevation model, a multi-time-phase remote sensing image and rainfall data, unitizing the terrace to form a terrace unit account book, an observability mark and an abnormal unit, extracting a structural continuity component and a hydrodynamic overtravel risk component, synthesizing a terrace structural integrity index and a confidence coefficient, carrying out confidence gating and hysteresis maintenance under rainfall and change double triggering, obtaining dynamic support measure factors through piecewise nonlinear mapping, calculating erosion reduction and transverse carbon conservation, reversely pushing a marginal restoration revenue generation list, backfilling and updating parameter versions, and archiving. The method can update and output a reckonable evidence chain when clouding and missing, reduces the overestimation of failure period corrosion reduction, and supports post-flood repair dispatch orders and performance verification.

Inventors

HE GUANGXIONG
FANG HAIDONG
LIANG ZHI
Liang Aiai
WANG YANDAN
YANG HAOZHOU
ZHANG BINYAN
SHI LIANGTAO

Assignees

云南省农业科学院热区生态农业研究所
元谋聚元食品有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (13)

1. The soil organic carbon increment and erosion emission reduction cooperative evaluation method for slope modification measures is characterized by comprising the following steps of, Registering the terrace space distribution base map, the digital elevation model and the multi-temporal remote sensing image, performing terrace unitization on the terrace space distribution base map and generating an observability mark to form a terrace unit account book and marking an abnormal unit; Extracting a structural continuity component and a hydrodynamic overtopping risk component in a terrace unit, and synthesizing a terrace structural integrity index and a confidence coefficient according to positive weight constraint; According to double triggering of rainfall event and integrity change, dynamic supporting measure factors are obtained through confidence level gating and combining hysteresis retention and piecewise nonlinear mapping of a failure punishment area, and the dynamic supporting measure factors are substituted into RUSLE/CSLE or InVEST sediment transport frames to obtain erosion and emission reduction and estimate transverse carbon retention; and generating a sampling inspection task for the low confidence unit based on the piecewise nonlinear mapping reverse-push marginal repair revenue generation priority list, and updating the positive weight constraint, the double triggering condition and the parameter version of the piecewise nonlinear mapping according to the sampling inspection result.
2. The soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 1, wherein: Registering the terrace space distribution base map, the digital elevation model and the multi-time remote sensing image after unifying coordinates and resolutions, performing terrace unitization on the terrace space distribution base map according to land parcels, writing geometric boundaries, areas and adjacent relations into a terrace unit account book, and writing observability marks.
3. The soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 2, wherein: and setting an abnormal unit mark for terrace units which cannot be registered, have true image missing marks and have abrupt change of a terrace space distribution base map, writing the abnormal unit mark, the abnormal reason and the corresponding time into a terrace unit ledger book and synchronously writing into a queue to be checked, and keeping the geometric boundary of the terrace units unchanged.
4. A soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 3, wherein: when multi-view multi-time-phase remote sensing images exist in the same period, respectively calculating observability marks corresponding to the images of each scene, selecting the image with the largest effective pixel proportion and the smallest cloud shielding proportion and shadow shielding proportion as the remote sensing image used for updating the observability marks in the period, and writing the observability marks into a terrace unit account book.
5. The soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 1, wherein: And identifying the break and gap of the boundary line of the terrace according to the multi-time-phase remote sensing image in the strip buffer zone, merging the gap paragraphs, counting the gap rate and continuity as structural continuity components, and outputting component interpretation of the structural continuity components.
6. The method for evaluating soil organic carbon increment and erosion emission reduction in a coordinated manner according to claim 5, wherein: And extracting the micro-terrain low points and the confluence concentration degree based on the digital elevation model and the hydrographic terrain derivative result thereof, positioning the potential overtopping low points and the abnormal confluence paths in the terrace unit, generating hydrodynamic overtopping risk components, and outputting the spatial positions of the potential overtopping low points and the abnormal confluence paths as component interpretation.
7. The method for evaluating soil organic carbon increment and erosion emission reduction in a coordinated manner according to claim 6, wherein: And when the observability mark indicates that the cloud cover ratio exceeds a preset threshold value, the structural continuity component in the last period is maintained and only the hydrodynamic overtaking risk component is updated, and when the image missing mark is true, the image missing mark enters a queue to be checked.
8. The method for evaluating soil organic carbon increment and erosion emission reduction in a coordinated manner according to claim 7, wherein: Triggering an updating candidate when a rainfall event reaches a local high-ranking threshold value, triggering the updating candidate when a structural continuity component is changed significantly, triggering the updating candidate when a hydrodynamic overtaking risk component is changed significantly, performing dynamic supporting measure factor updating after the updating candidate is subjected to confidence level gating, and keeping a previous period state and entering a queue to be checked through a gate-controlled terrace unit.
9. The method for evaluating soil organic carbon increment and erosion emission reduction in a coordinated manner according to claim 8, wherein: And after judging that the terrace unit enters the degradation zone and comprises the condition of entering the failure zone, starting hysteresis retention, limiting the dynamic supporting measure factors to be not allowed to rise quickly in the retention period, writing the retention period state and the triggering reason into the terrace unit ledger, and when the terrace structural integrity index returns to the target zone and meets the exit condition, releasing the hysteresis retention.
10. The soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 9, wherein: The terrace structural integrity index is converted into a dynamic supporting measure factor through piecewise nonlinear mapping, and enters a failure punishment area and is set to be saturated in an upper bound when the terrace structural integrity index is lower than a failure threshold value, the dynamic scenario erosion amount and the counter-facts scenario erosion amount are calculated and are differenced under the condition that other factors are kept unchanged to obtain erosion and emission reduction, and meanwhile, the soil organic carbon content is combined to estimate the transverse carbon retention amount and output a confidence label.
11. The soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 1, wherein: And calculating marginal repair benefits for each terrace unit, wherein the marginal repair benefits comprise recovering terrace structural integrity indexes to target intervals under the condition of not changing rainfall, soil and coverage, improving the amplitude by piecewise nonlinear mapping reverse thrust dynamic supporting measure factors, and then estimating increasable of erosion emission reduction and transverse carbon conservation and generating a priority list.
12. The soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 11, wherein: And generating a spot check task for terrace units with low confidence and high risk and high marginal repair benefit, backfilling terrace unit account books by taking unmanned aerial vehicle elevation results and patrol records as calibration inputs, updating parameter versions of positive weight constraint, double triggering conditions and piecewise nonlinear mapping according to backfilling results, and establishing archive records for the parameter versions.
13. The soil organic carbon increment and erosion emission reduction co-evaluation method according to claim 12, wherein: After the selective inspection backfilling, when the terrace structural integrity index continuously returns to the target area in a preset period and the double trigger condition is not triggered, releasing the hysteresis retention and recovering the normal updating frequency, outputting a recalculable evidence chain comprising an input version, a trigger record, a parameter version and a result record, and when the soil organic carbon basic parameter is absent, only outputting the relative ordering of the transverse carbon retention quantity and writing in a supplementary sampling plan.

Description

Soil organic carbon increment and erosion emission reduction cooperative evaluation method for slope-to-ladder measure Technical Field The invention relates to the technical field of water and soil conservation evaluation, in particular to a soil organic carbon increment and erosion emission reduction cooperative evaluation method for slope-to-ladder measures. Background Slope-to-terrace (terraced field) is an important project in slope farmland soil and water conservation projects, is commonly used in loess plateau, southwest hilly and other areas, and along with the requirements of soil and water conservation performance evaluation and carbon sequestration accounting, the reduction of soil erosion and SOC (system on chip) conservation/carbon emission reduction of terraced fields in county/small river basin scales are generally required to be examined, and the current technology mostly adopts the steps of firstly obtaining terraced field distribution and then selecting supporting measure factors in models such as USLE/RUSLE to calculate erosion differences of different scenes. In the field extraction aspect, chinese patent CN110415265B (application day: 2022, 09, 23, 201910729929.0) discloses a method for extracting a terrace based on high-precision DEM gradient characteristics of an unmanned plane, in the carbon sink accounting aspect, local standard dB15/T4248-2025 (release day: 2025, 12, 25, 2026, 01 and 25) of an inner Mongolian autonomous region prescribes an accounting framework, chinese patent CN116429723B (application day: 2023, 09, 05, 202310355004.0) discloses a method for measuring and calculating carbon sink quantity of soil based on parameters such as measure erosion reducing benefit, surface layer SOC and the like, and Chinese patent CN115438470B (application day: 2023, 11, 28, 202210987716. X) provides a water and soil conservation carbon sink measuring and calculating model and a thought based on erosion module difference values before and after a measure implementation project. The technical route based on terrace distribution and fixed parameter erosion evaluation and further converting carbon sink has the following problems in county/small-river flood season operation and maintenance scenes: Under the conditions of tillage disturbance, rainfall erosion and management and protection difference, the terrains, drainage, micro-topography of the fields and the like are degraded and damaged, the conditions of overtopping, converging path change and the like occur after heavy rainfall, the real corrosion reduction capability has time difference, the prior art route is based on historical or once acquired terrains, a fixed supporting measure factor or a fixed corrosion reduction modulus is used in the annual or long time scale, and the corrosion reduction amount is used as input in SOC/carbon sink accounting. When the surface engineering state deviates from a static assumption, erosion and emission reduction and a calculated transverse soil conservation and carbon fixation result are possibly inconsistent with reality, and the terrace state is updated more depending on periodic interpretation or field check, so that rechecking data are difficult to obtain in time due to the large cloud, broken topography and scattered situation of a management unit, and consistency of post-flood risk elimination, management and protection decision, annual performance calculation and audit rechecking is affected. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a soil organic carbon increment and erosion emission reduction cooperative evaluation method for slope modification ladder measures, which is used for synthesizing a terrace structure integrity index and a confidence coefficient by extracting a structure continuity component and a hydrodynamic overtopping risk component, obtaining dynamic support measure factors and calculating erosion emission reduction and transverse carbon conservation through confidence coefficient gating and hysteresis retention under rainfall and change double triggering by piecewise nonlinear mapping, and reversely pushing a marginal repair revenue generation list and checking backfill updating parameter versions and archiving. The method can update and output the recalculable evidence chain during cloud shading and missing, reduces the overestimation of failure period corrosion reduction, and solves the technical problems recorded in the background technology. (II) technical scheme In order to achieve the above purpose, the invention is realized by the following technical scheme: the soil organic carbon increment and erosion emission reduction cooperative evaluation method for slope modification measures comprises registering a terrace space distribution base map, a digital elevation model and a multi-temporal remote sensing image, performing terrace unitization on the terrace space distribution base map and