2000-2020年陕西省陆地生态系统NPP时空变化与潜力研究
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1.西北农林科技大学水土保持研究所;2.陕西省林业调查规划院

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Spatial and temporal variation and potential of NPP in terrestrial ecosystems in Shaanxi Province from 2000 to 2020
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1.Northwest Agriculture &2.Forestry University;3.1

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    摘要:

    在“双碳”战略实施背景下,准确地评估陆地生态系统固碳现状、速率与潜力,对实现“碳中和”目标意义重大。陕西省横跨三个气候带,南北气候差异大,植被类型丰富。近年来,由于多项生态工程(退耕还林还草、三北防护林等)的实施,陕西省植被覆盖度进一步提升到60.7%,固碳能力巨大。陆地生态系统NPP(植被净初级生产力)是反映植被固碳能力的重要指标,然而,关于陕西省NPP的时空动态变化,以及NPP未来潜力的空间分布鲜有研究。本研究以陕西省陆地生态系统为研究对象,利用CASA模型和邻域相似空间分布法评估了陕西省植被NPP及其潜力的时空分布特征。结果表明:(1)陕西省植被总固碳量在2000年和2020年分别为687 Tg和1020 Tg,增加了333 Tg,增幅分别为48.5%。(2)陕西省NPP呈现南高北低,中间存在最高值或最低值的空间分布态势,平均值在2000年和2020年分别为333.2 g C/m2和494.8 g C /m2,共增加161.6 gC /m2,增加幅度呈现北高南低的分布态势。(3)陕西省生态系统NPP的实际最大潜力为2304 Tg,相比于2020年可增加41.3%,空间分布态势表现为由南到北逐渐降低,且空间分布特征均表现出高度空间自相关特性,但局部差异较大。本研究评估和预测了陕西省区域尺度生态系统NPP时空动态变化及潜力空间分布特征,可为科学评价提升区域碳汇能力提供了一定的评价体系和理论参考。

    Abstract:

    In the context of the "dual- carbon" goal, accurately assessing the status, rate and potential of carbon sequestration in terrestrial ecosystems is crucial for achieving “carbon neutrality”. Shaanxi province, which spans three climatic zones and have a large difference in climate between north and south, with abundant vegetation types. In recent years, the vegetation coverage in Shaanxi has been further improved due to the implementation of various ecological projects (Grain for Green, Three-North Shelterbelt, etc.). Its vegetation coverage reach up to 60.7%, what resulted in huge carbon sequestration capacity. Net primary productivity (NPP), as one of the most important indicator to reflect the carbon sequestration capacity of vegetation, there are few studies on spatial and temporal dynamic changes of NPP and the spatial distribution of NPP potential in the future in Shaanxi Province. Based on these, we evaluated the temporal and spatial distribution characteristics of vegetation NPP and its potential in Shaanxi Province through CASA model and neighborhood similarity spatial distribution method. The results showed that: (1) Total carbon sequestration by vegetation increased by 333Tg, with an increase of 48.5% from 2000 to 2020 in Shaanxi Province. (2) NPP was higher in the south and lower in the north, with the highest or lowest value in the middle. The average value in 2000 and 2020 were 333.2 g C/m2 and 494.8 g C/m2, respectively, with a total increasement of 161.6 gC/m2, and the increase amplitude shows a distribution trend of high in the north and low in the south in Shaanxi. (3) The carbon sequestration potential was 2304 Tg which increased by 41.30% compared with the 2020. The spatial distribution trend is gradually decreasing from south to north, and the spatial distribution characteristics show high spatial autocorrelation characteristics, but the local differences are large. This study calculated the spatial and temporal dynamic changes and predicted potential spatial distribution characteristics of NPP in the regional scale ecosystem in Shaanxi, which can provide a evaluation systematic and theoretical reference for scientific evaluation and improvement of regional carbon sink capacity.

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  • 收稿日期:2023-09-11
  • 最后修改日期:2023-12-15
  • 录用日期:2023-12-27
  • 在线发布日期: 2024-04-29
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