Wang Zeyong, Yang Yingchun, Tian Qi, Wei Youning, Yang Haoqi, Niu Yao
Fifth Institute of Geological and Exploration of Qinghai Province, Xining, 810000, China.
Qinghai Geological Survey, Xining, 810000, China.
Sci Rep. 2024 Sep 19;14(1):21900. doi: 10.1038/s41598-024-72813-1.
As the first ladder of China, the Qinghai-Tibet Plateau has always been known as the "roof of the world". Its environmental carrying capacity can be estimated more accurately than other regions because of its harsh natural environment, low population density, limited industrial and agricultural development, and low human activities. However, the current ecological risks of Co and threshold research are limited, and there is a lack of awareness of W's environmental risks. Hence, this study assessed the ecological support potential of the Bardawu region within Dulan County, Qinghai Province, using 7373 soil specimens, determined regional soil baseline measures, and applied the substance equilibrium linear technique along with the ecological aggregate indicator technique to examine the heavy metal content of the soil. A comprehensive evaluation of the environmental capacity and health risks was conducted to provide a reference for pastoral planning. The findings indicated that the cumulative static ecological capacity of the six trace heavy elements in the soil was ranked as follows: Cr > Li > Ni > Cu > W > Co, with W and Co positioned as the final pair. The remaining areas with a high environmental capacity were predominantly found in the study zone. The central sector exhibited diminished environmental capacity in the southwest and northeast and presented a contamination hazard. Land use, soil type, and geological type considerably affected the six elements in the study area at the p < 0.05. The Bardawu region's mean comprehensive index of soil environmental capacity was 0.98, indicating an intermediate level of environmental capacity and a moderate health risk. This study focuses on the geological context and influence of pastoral activities on the soil, augments the distribution of various elements across the Tibetan Plateau, and suggests preliminary soil governance strategies. The findings of this study lay the groundwork for soil environmental conservation and remediation efforts in highland regions.
作为中国的第一阶梯，青藏高原一直被誉为“世界屋脊”。由于其恶劣的自然环境、低人口密度、有限的工农业发展以及较少的人类活动，其环境承载能力相比其他地区能够得到更准确的评估。然而，目前关于钴的生态风险及阈值研究有限，且对钨的环境风险缺乏认识。因此，本研究利用7373个土壤样本评估了青海省都兰县巴尔德武地区的生态支撑潜力，确定了区域土壤基线指标，并应用物质平衡线性技术和生态综合指标技术来检测土壤中的重金属含量。对环境容量和健康风险进行了综合评估，为牧区规划提供参考。研究结果表明，土壤中六种微量重金属元素的累积静态生态容量排序如下：铬＞锂＞镍＞铜＞钨＞钴，钨和钴排在最后。研究区内环境容量较高的区域主要集中在其他地区。中部地区在西南部和东北部环境容量降低，并存在污染危害。土地利用、土壤类型和地质类型在p＜0.05时对研究区的六种元素有显著影响。巴尔德武地区土壤环境容量的平均综合指数为0.98，表明环境容量处于中等水平，健康风险为中度。本研究关注地质背景以及牧业活动对土壤的影响，补充了青藏高原各种元素的分布情况，并提出了初步的土壤治理策略。本研究结果为高原地区土壤环境保护和修复工作奠定了基础。
