地形对武夷山地区总初级生产力的影响
首发时间:2024-03-08
摘要:武夷山地区植被覆盖度高,对区域碳循环与平衡具有重要作用。而武夷山地区地处东南丘陵,地形复杂,导致评估该地区碳循环的不确定性增加。因此本文采用了充分考虑地形的生态水文过程模型BEPS-TerrainLab V2.0(BTL),模拟2001-2018年武夷山地区多年平均总初级生产力(GPP)的空间分布,并结合地形数据分析了GPP对不同地形(包括高程、坡度、坡向)的响应特征。研究发现:武夷山地区GPP在空间上表现出显著的异质性。随着海拔的增加,年平均GPP呈正相关趋势,受到温度和日照强度的影响,使得植被在高海拔地区光合作用活动增加。对于坡度而言,较小的坡度有助于提高GPP,而过于陡峭的坡度则导致GPP减少,可能因土壤侵蚀和水分流失限制了植被的生长。在坡向方面,阳坡(包括半阳坡)相对于阴坡(包括半阴坡)表现出较高的GPP,但高温可能导致阳坡的GPP受到抑制。这些研究结果有助于深入理解武夷山地区植被生态系统对地形因素的响应,为生态环境保护和可持续管理提供了重要参考。
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Influence of topography on gross primary productivity in the Wuyi Mountain region
Abstract:The high vegetation coverage in the Wuyi Mountain region plays a crucial role in regional carbon cycling and balance. However, situated in the hilly Southeast, the complex terrain of the Wuyi Mountain region increases the uncertainty in assessing carbon cycling in the region. Therefore, this study employed the ecohydrological process model BEPS-TerrainLab V2.0 (BTL), which adequately considers terrain characteristics, to simulate the spatial distribution of the multi-year average Gross Primary Productivity (GPP) in the Wuyi Mountain region from 2001 to 2018. Additionally, it analyzed the response characteristics of GPP to different terrains, including elevation, slope, and aspect, based on terrain data. The research revealed significant spatial heterogeneity in GPP across the Wuyi Mountain region. With increasing elevation, the annual average GPP exhibited a positive correlation, influenced by temperature and solar radiation, leading to increased photosynthetic activity at higher elevations. Concerning slope, smaller slopes contributed to higher GPP, while excessively steep slopes led to GPP reduction, likely due to soil erosion and water loss restricting vegetation growth. Regarding aspect, south-facing slopes (including southeast and southwest) exhibited higher GPP compared to north-facing slopes (including northeast and northwest). However, elevated temperatures on south-facing slopes could potentially inhibit GPP. These findings contribute to a deeper understanding of how the vegetation ecosystem in the Wuyi Mountain region responds to terrain factors, providing valuable insights for ecological environmental protection and sustainable management.
Keywords: Natural Geography Topography Gross Primary Productivity Wuyi Mountain Region
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