GB/T 42631-2023 in English

VALID

Guideline for marine ecosystem health assessment in nearshore area

Issued on:2023-05-23
Implemented on:2023-12-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $430.00
$418.00

Standard No:	GB/T 42631-2023
Document status:	VALID
Title in English:	Guideline for marine ecosystem health assessment in nearshore area
Title in Chinese:	近岸海洋生态健康评价指南
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2023-05-23
Implemented on:	2023-12-01
Chinese Classification:	Z17-Analysis methods for substances in ocean
Professional Classification:	GB-National Standard
Related Keywords:	marine ecosystem health assessment ecological health index seasonal fluctuations gb17378.2 health diagnosis prioritize pointsreef-building coral coverage reef-building coral coverage
Related Topics:	coastal town Cobalt valence Evaluation Guidelines marine ecology Southern Ocean near shore protein marine nearshore pollution Ocean nearshore Mid South West Coast Ecological health marine ecology near shore protein Guidelines for Assessment of Coastal Marine Ecological Health Valence state of cobalt Valence state of palladium Cobalt valence Near sea spring Oceans for Human Health Nearshore layout Evaluation Guidelines Ecological Community Evaluation Guide Marine debris evaluation Ecological Corridor Evaluation

《GB/T 42631-2023近岸海洋生态健康评价指南》由TC283（全国海洋标准化技术委员会）归口，TC283SC3（全国海洋标准化技术委员会海洋生物资源开发与保护分会）执行，主管部门为自然资源部(海洋)。

Introduction

Analysis of the core framework of the standard

class=instrument>Mangrove

Ecosystem type	First-level indicator	Maximum weight	Key evaluation parameters
Coral reef	Habitat quality	60 points	Reef-building coral coverage, algae/coral ratio
Seagrass bed	Biological community	50 points	Seagrass coverage, benthic animal biomass
Seagrass bed	Biological community	50 points	Seagrass coverage, benthic animal biomass
Biological community	50 points	Coverage, bird population changes
Estuary/bay	Biological community	45 points	Plankton density, benthic animal mass

Key technological breakthroughs

Innovative evaluation model: A multi-level weighted index method is adopted, in which the Coral reef ecological health index (CEH_indx) = water environment index + habitat index + biological community index, and the threshold is set as:

Health: ≥80 points
Sub-health: 45-79 points
Unhealthy: <45 points

Implementation suggestions

Operational steps	Technical requirements	Reference standards
Sample collection	Stratified and random distribution, coral reefs according to HY/T 082 standard	GB17378.3
Data processing	Use moving average method to eliminate seasonal fluctuations	GB17378.2
Health diagnosis	Prioritize the warning value of mangrove coverage change rate > 10%	HY/T 081