基于InVEST模型的北京山区森林生态系统碳储量评估分析

本文基于北京山区遥感影像数据和标准样地调查数据,利用In VEST模型碳储量模块,评估分析了北京山区森林生态系统的碳储量。结果表明,北京山区森林生态系统的平均碳密度为99. 95 Mg/hm~2,其中乔木层、灌木层、草本层、凋落物层和土壤层平均碳密度分别为10. 51、3. 16、0. 86、8. 61、76. 81 Mg/hm~2。植被碳密度与土壤碳密度呈现显著正相关关系,土壤碳密度与凋落物碳密度呈现显著正相关关系。各林分类型平均碳密度表现为落叶针叶林(153. 99 Mg/hm~2)针阔混交林(132. 45Mg/hm~2)落叶阔叶林(125. 10 Mg/hm~2)常绿针叶林(111. 78 Mg/hm~2)灌木林(72. 26 Mg/hm~2)。北京山区森林生态系统总碳储量为77. 41 Tg,其中乔木层、灌木层、草本层、凋落物层和土壤层的碳储量分别为8. 14、2. 45、0. 67、6. 67、59. 48 Tg。各林分类型总碳储量表现为落叶阔叶林(43. 23 Tg)灌木林(25. 90 Tg)常绿针叶林(6. 21 Tg)针阔混交林(1. 42 Tg)落叶针叶林(0. 65 Tg)。落叶阔叶林和灌木林是北京山区森林生态系统碳储量的主要贡献者,分别占55. 84%和33. 46%。在北京山区各个区县中,怀柔区碳储量最高(15. 37 Tg),平谷区碳储量最低(4. 89 Tg)。北京山区森林生态系统碳储量分布不均,总体表现为北京山区北部区县较高,西部区县偏低,中部和东部最低。

Assessment of Forest Ecosystem Carbon Storage in the Mountain Area of Beijing Based on the InVEST Model

The study introduced the Intergrated Valuation of Ecosystem Services and Tradeoffs (InVEST) carbon storage module and evaluated carbon storages of forest ecosystems in the mountainous area of Beijing. The remote sensing image data and the standard plot survey data of the Beijing mountainous area were analyzed by this carbon storage module. The results showed that the average carbon density of all forest ecosystems in Beijing mountainous area was 99.95 Mg/hm², and average carbon densities of tree layer, shrub layer, herb layer, litter layer and soil layer were 10.51, 3.16, 0.86, 8.61 and 76.81 Mg/hm², respectively. It was found that the soil carbon density correlated positively and significantly with carbon densities of vegetation and litter. The order of average carbon densities of different types of forest was:deciduous conifer forest (153.99 Mg/hm²) > conifer and broadleaf mixed forest (132.45 Mg/hm²) > deciduous broadleaf forest (125.10 Mg/hm²) > evergreen conifer forest (111.78 Mg/hm²) > shrub forest (72.26 Mg/hm²). The total carbon storage of all forest ecosystems in the Beijing mountainous area was about 77.41 Tg, among which carbon storages of tree layer, shrub layer, herb layer, litter layer and soil layer were 8.14, 2.45, 0.67, 6.67 and 59.48 Tg, respectively. The order of carbon storages of different types of forest was:deciduous broadleaf forest (43.23 Tg) > evergreen conifer forest (25.90 Tg) > shrub forest (6.21 Tg) > conifer and broadleaf mixed forest (1.42 Tg) > deciduous conifer forest (0.65 Tg). The deciduous broadleaf forest and the shrub forest were the main contributors to the carbon storage of forest ecosystems in the Beijing mountainous area, accounting for 55.84% and 33.46%, respectively. The regions with the highest carbon storage and the lowest carbon storage were the Huairou District (15.37 Tg) and the Pinggu District (4.89 Tg), respectively. The carbon storages of forest ecosystems distributed unevenly in the Beijing mountainous area, which was higher in the northern region, then in the western region, and was the lowest in central and eastern regions of the Beijing mountainous area.