小柯机器人

美国圣母大学J. S. McLachlan和A. M. Raiho共同合作，近期取得重要工作进展，他们研究发现人口和生物群落规模过程推动美国中西部森林生物量在8000年内翻了一倍。该项研究成果2022年6月24日在线发表于《科学》杂志上。

在这里，研究人员使用根据工业化前森林生物量估计和化石花粉记录校准的贝叶斯模型，统计重建了过去10,000年来美国中西部上游地区的木质生物量变化。 在冰期后最初的衰退之后，在过去的8000年里，木质生物量几乎翻了一番，封存了1800吨。 这种碳的稳定积累是由对区域气候变化的两种不同的生态反应驱动的：森林生物群落的扩散和森林内高生物量树种的种群扩张。 花了几千年积累起来的东西用了不到两个世纪的时间就清除了，工业时代的伐木和农业已经消除了这种碳积累。

据介绍，木本植物生物量在几个世纪到几千年之间的变化鲜为人知，这使得人们不清楚在工业时代干扰之前陆地碳通量的大小。

附：英文原文

Title: 8000-year doubling of Midwestern forest biomass driven by population- and biome-scale processes

Author: A. M. Raiho, C. J. Paciorek, A. Dawson, S. T. Jackson, D. J. Mladenoff, J. W. Williams, J. S. McLachlan

Issue&Volume: 2022-06-24

Abstract: Changes in woody biomass over centuries to millennia are poorly known, leaving unclear the magnitude of terrestrial carbon fluxes before industrial-era disturbance. Here, we statistically reconstructed changes in woody biomass across the upper Midwestern region of the United States over the past 10,000 years using a Bayesian model calibrated to preindustrial forest biomass estimates and fossil pollen records. After an initial postglacial decline, woody biomass nearly doubled during the past 8000 years, sequestering 1800 teragrams. This steady accumulation of carbon was driven by two separate ecological responses to regionally changing climate: the spread of forested biomes and the population expansion of high-biomass tree species within forests. What took millennia to accumulate took less than two centuries to remove: Industrial-era logging and agriculture have erased this carbon accumulation.

DOI: abk3126

Source: https://www.science.org/doi/10.1126/science.abk3126