陕西省森林土壤固碳特征及其影响因素

发布时间：2018-02-20 18:59

本文关键词： 森林土壤碳储量碳密度空间分布影响因素　出处：《植物生态学报》2017年09期 　论文类型：期刊论文

【摘要】：森林土壤碳库在全球碳循环中发挥着重要的作用。为明确陕西省森林土壤固碳特征及其影响因素,基于2009年森林清查资料和2011年样地实测数据,分析了陕西省森林土壤碳储量、碳密度及其分布特征和影响因素。结果表明:陕西省森林土壤碳储量为579.68 Tg,以软阔与硬阔类林土壤碳储量占比最大,占全省森林土壤碳储量的36.35%。天然林的碳储量为467.17 Tg,是人工林的4.15倍。各龄组中,幼龄林和中龄林是陕西省森林土壤总碳储量的主要贡献者,约占总碳储量的57.30%。陕西省森林土壤平均碳密度为90.68 t·hm~( 2),以桦木林最高,为141.74 t·hm~( 2)。不同龄组森林的土壤碳密度以中龄林最高;同一龄组中,天然林的土壤碳密度高于人工林,说明天然林的碳固存能力高于人工林。陕西省森林土壤碳储量和碳密度的地理空间分布格局不尽相同,体现了森林覆盖面积对土壤碳储量的影响,其中,榆林市的森林土壤碳储量和碳密度均处于陕西省最低水平,在此地可适当加强人工造林,科学管理森林能显著提升区域的碳汇能力。陕西省森林土壤碳密度随经纬度和年平均气温的增加逐渐降低,随海拔高度与年降水量的增加逐渐升高。该研究为我国省域尺度上森林土壤碳库的精确估算提供了一定的数据基础。
[Abstract]:Forest soil carbon pool plays an important role in the global carbon cycle. In order to clarify the characteristics of forest soil carbon sequestration and its influencing factors in Shaanxi Province, the forest soil carbon storage in Shaanxi Province was analyzed based on the forest inventory data of 2009 and the measured data of sample plots on 2011. The results showed that the carbon storage of forest soil in Shaanxi Province was 579.68 Tg, and the ratio of soil carbon storage in soft broad-leaved and hard broad-leaved forests was the largest. The carbon storage of natural forest is 467.17 Tg, which is 4.15 times of that of artificial forest. Among different age groups, young forest and middle age forest are the main contributors of total carbon storage of forest soil in Shaanxi Province. The average carbon density of forest soil in Shaanxi Province was 90.68 t 路hm ~ (-1), the highest in birch forest (141.74 t 路hm ~ (-1)). The soil carbon density of forest of different ages was the highest in middle age forest, and the soil carbon density of natural forest was higher than that of artificial forest in the same age group, the average carbon density of forest soil in Shaanxi Province was 90.68 t 路hm ~ (-1), and that in birch forest was the highest (141.74 t 路hm ~ (-1)). The results show that the carbon sequestration ability of natural forest is higher than that of artificial forest. The spatial distribution pattern of forest soil carbon storage and density in Shaanxi Province is different, which reflects the influence of forest cover area on soil carbon storage. Forest soil carbon storage and carbon density in Yulin City are at the lowest level in Shaanxi Province. Scientific forest management can significantly improve the carbon sink capacity of the region. The carbon density of forest soil in Shaanxi Province decreases with the increase of longitude and latitude and annual mean temperature. With the increase of altitude and annual precipitation, this study provides a certain data basis for the accurate estimation of forest soil carbon pool on the provincial scale in China.
【作者单位】：中国科学院教育部水土保持与生态环境研究中心;中国科学院大学;延安市宝塔区水务局水土保持监督管理站;西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院水利部水土保持研究所;
【基金】：国家自然科学基金(41371506、41201088和41601058) 国家重点研发计划项目(2016YFC05-01703)
【分类号】：S714

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