Subjects: Environmental Sciences, Resource Sciences >> Other Disciplines of Environmental Sciences, Resource Sciences submitted time 2021-03-02 Cooperative journals: 《干旱区研究》
Abstract：区域碳储量是生态系统功能的重要度量指标，探索土地改造对区域碳储量变化的影响，对于协调区域生态建设和生态产业发展具有重要意义。基于InVEST模型和地理信息系统技术，研究了陕西省延安南部麻塔流域1999—2016年土地结构改造过程中区域碳储量变化，并探讨坡度、坡向、坡位对碳储量空间分布的影响。结果表明：麻塔流域18 a的土地改造使得区域碳储量增加1688.36 Mg（碳密度增加6.92 Mg·hm2），总固碳功能提升约7.63%。森林、草地和果园土地类型面积的增加是植被转换后流域景观碳储量提升的主要贡献者。碳储量增加的空间位置主要分布在半阴坡、中上坡位以及坡度10°~30°。本研究认为林草植被建设和经济果林建设两者都有利于增强麻塔流域景观固碳能力。麻塔流域土地转换模式能够协调区域生态建设和生态产业的发展，在黄土丘陵区具有较好的推广价值。
Subjects: Biology >> Botany >> Plant ecology, plant geography submitted time 2016-05-03
Abstract： Aims Carbon sequestration is the basic function and most primary service of forest ecosystems, and plays a vital role in mitigating the global climate change. However, carbon storage and allocation in forest ecosystems have been less studied at regional scales than for forest stands, and the results are subject to uncertainty due to inconsistent methodologies. Here, we aimed at relatively accurate estimates of forest carbon storage and sequestration rate at a provincial scale (regional) based on plot surveys of both stand biomass and soils over the province. Methods Based on the area and distribution of major forest types, 212 sampling plots, covering different age classes and originality (natural/planted), were surveyed in Gansu Province in northern China. Field investigations were conducted for vegetation layers (trees, shrubs, herbs and litter), soil profiles, and sampling of both plant materials and soils for laboratory analyses. Regional carbon storage was calculated by up-scaling the carbon densities of all forest types with their corresponding areas. Carbon sequestration rate was estimated by referring the reports of national forest inventory for different periods. Important findings Forest carbon storage at the provincial scale was 612.43 Tg C, including 179.04 Tg C in vegetation biomass and 433.39 Tg C in soil organic materials. Specifically, natural forests contributed largely and stored 501.42 Tg C, approximately 4.52 times that of the plantations. Vegetation carbon density in both natural forests and plantations showed increasing trend with the increase in age classes, and the natural forest showed a higher value than the plantation at the same age class. Soil carbon density also increased along the age classes in natural forests, whereas the highest value in plantations appeared at pre-mature stage. Weighted average of regional vegetation carbon density was 72.43 Mg C?hm–2, with 90.52 and 33.79 Mg C?hm–2 in natural forest and plantations, respectively. In 1996, vegetation biomass stored 132.47 and 12.81 Tg C in natural forests and plantations, respectively, and the values increased to 152.41 and 26.63 Tg C in 2011, with the mean carbon sequestration rates of 1.33 and 0.92 Tg C?a–1. Given that young and middle-aged forests account for a large proportion (62.28%) of the total forest area, they are expected to exert substantial potential of carbon sequestration in the province.
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