83个黑土地重点保护县地表基质调查完成

Core Insights - The project represents the first completed surface substrate survey in Northeast China's black soil region, covering 83 key protection counties and establishing a new model for farmland protection based on surface substrate [1][2] Group 1: Project Overview - The survey was led by the China Geological Survey and involved five organizations, taking three years to complete [1] - The investigation covered an area of 411,700 square kilometers, approximately 38% of the total black soil area in China [1] - A total of 711 personnel and 538 pieces of equipment were utilized, with 21,242 boreholes and 8,077 natural profiles and trenches completed [1] Group 2: Findings and Models - The survey quantified black soil resources for the first time, identifying a distribution area of 387,500 square kilometers, which is about 94% of the surveyed area [2] - The project established a stability evaluation model and a comprehensive quality evaluation model based on soil thickness, organic matter content, and nutrient levels [2] - The results indicated that 86.34% of the black soil area is stable or relatively stable, while 13,500 square kilometers face significant degradation risks [2] Group 3: Carbon Storage and Resource Potential - The project identified 13,600 square kilometers of potential backup arable land, primarily in Inner Mongolia, western Jilin, and southwestern Heilongjiang [3] - The total carbon storage in the surface substrate layer to a depth of 2 meters was calculated at 3.401 billion tons, with organic carbon storage at 2.117 billion tons [3] - The project developed a "3-level 5-category" classification system for surface substrates, enhancing the theoretical framework for soil management [3] Group 4: Future Directions - The surface substrate survey will expand its coverage to better understand black soil resources and establish a regular monitoring network [4] - The project aims to integrate with land spatial planning, agricultural layout, ecological restoration, and carbon assessment, promoting a shift from "surface management" to "substrate management" [4]