长白山自然保护区总初级生产力时空变化特征及其影响因素

doi:10.13287/j.1001-9332.202305.026

摘要/Abstract

摘要： 长白山自然保护区是典型的温带原始森林生态系统,其植被总初级生产力(GPP)与地形和气候变化密切相关,开展长白山自然保护区GPP的时空变化特征以及影响因子研究,对于了解植被生长状况和生态环境质量具有重要意义。本研究采用光能利用率模型(VPM)对长白山自然保护区GPP进行估算,并分析坡度、海拔、气温、降水、总辐射对其的影响。结果表明: 2000—2020年,长白山自然保护区GPP多年平均值为63~1706 g C·m^-2·a^-1,GPP随海拔的增加而减小。气温是影响长白山自然保护区植被GPP空间分布差异的主要因素,其与GPP之间存在显著正相关性。研究期间,长白山自然保护区年GPP整体呈极显著增加趋势,年均增加值为13 g C·m^-2·a^-1。年GPP增加的区域占总区域的79.9%,且各植物功能型年GPP增加面积的比例存在差异。年降水与长白山自然保护区43.2%区域的GPP呈显著负相关,而年均温和年总辐射分别与长白山自然保护区47.2%和82.4%区域的GPP呈显著正相关。在未来全球气候变暖的背景下,长白山自然保护区GPP将会持续增加。

关键词: 总初级生产力, 光能利用率模型, 长白山自然保护区, 气候变化

Abstract: Changbai Mountain Nature Reserve (CNR) is a typical temperate forest ecosystem, and gross primary production (GPP) of which is closely related to topography and climate change. Research on the spatio-temporal variations and influencing factors of GPP in the CNR is of great significance for assessing growth status of vegetation and the quality of ecological environment. We calculated GPP in CNR using the vegetation photosynthesis model (VPM), and analyzed the influences of slope, altitude, temperature, precipitation, and total radiation. The results showed that the range of annual average GPP in CNR was 63-1706 g C·m^-2·a^-1 from 2000 to 2020 and that GPP decreased with the increases of altitude. Temperature played the most important role in driving the spatial varia-tion of GPP, with a significant positive correlation with GPP. During the study period, the overall annual GPP showed a significant increase trend in CNR, with an average annual increase of 13 g C·m^-2·a^-1. The areas with increase of annual GPP accounted for 79.9% of the total area, and the area proportion of annual GPP increase differed in each plant functional type. Annual precipitation was significantly negatively correlated with GPP in 43.2% of CNR, while annual mean temperature and annual total radiation were significantly positively correlated with GPP in 47.2% and 82.4% of CNR. GPP would increase continuously in CNR under the scenario of future global warming.

Key words: gross primary production (GPP), vegetation photosynthesis model (VPM), Changbai Mountain Nature Reserve, climate change

李春波, 张园, 刘雅各, 吴家兵, 王安志. 长白山自然保护区总初级生产力时空变化特征及其影响因素[J]. 应用生态学报, 2023, 34(5): 1341-1348.

LI Chunbo, ZHANG Yuan, LIU Yage, WU Jiabing, WANG Anzhi. Temporal and spatial variations and influencing factors of gross primary productivity in Changbai Mountain Nature Reserve, China[J]. Chinese Journal of Applied Ecology, 2023, 34(5): 1341-1348.

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