东北八十三个黑土地重点保护县地表基质调查完成 划定黑土地“可量化边界”

Core Viewpoint - The recent comprehensive survey of soil resources in Northeast China's black soil region has established a full-chain evaluation model, transitioning from understanding resource status to optimizing resource utilization, providing precise technological support for land planning, ecological protection, and resource-intensive use [1][2]. Group 1: Survey Findings - The survey delineated the "quantifiable boundary" of black soil, identifying an area of 387,500 square kilometers, which constitutes approximately 94% of the surveyed area, based on criteria of soil thickness and organic matter content [2]. - The project revealed the presence of multiple layers of black soil with thickness greater than 20 centimeters and organic matter content ranging from 15 grams per kilogram to 77.5 grams per kilogram, offering new scientific insights into the formation and evolution of black soil [2]. - The stability evaluation model developed by the project team categorized areas into stable, relatively stable, potentially unstable, and degraded zones, with 86.34% of the black soil area classified as stable or relatively stable [2]. Group 2: Carbon Storage and Environmental Impact - The project calculated a total carbon storage of 3.401 billion tons and organic carbon storage of 2.117 billion tons in the top 2 meters of the soil, with the top 20 centimeters accounting for 564 million tons, supporting the achievement of carbon neutrality goals [3]. - The findings indicate a strong correlation between different types of degradation and the structure of the surface matrix layer, suggesting that effective management should focus on geological causes and prioritize matrix management for precise restoration [3]. Group 3: Future Directions - The project aims to expand the coverage of soil surveys to enhance the understanding of black soil resources and establish a normalized monitoring network, integrating land planning, agricultural layout, ecological restoration, and carbon assessment [3]. - The results have been applied in various scenarios, including black soil stripping projects and farmland quality management, providing robust technical support for national initiatives on black soil protection and utilization [3].