| 海南岛森林植被NEP季节性时空变化规律及气候驱动因素分析 |
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| 引用本文： | 刘应帅,余瑞,郑彬彬,刘嘉慧,宋奇,陈荣昊,严哲.海南岛森林植被NEP季节性时空变化规律及气候驱动因素分析[J].热带生物学报,2022,13(2):166-176. |
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| 作者姓名： | 刘应帅 余瑞 郑彬彬 刘嘉慧 宋奇 陈荣昊 严哲 |
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| 作者单位： | 1.海南大学 生态与环境学院，海口 570228 |
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| 基金项目： | 海南省自然科学基金;海南省地球观测重点实验室开放基金;海南大学科研启动项目;国家自然科学基金 |
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| 摘 要： | 为了探究海南岛森林净生态系统生产力（Net Ecosystem Productivity，NEP）的时空变化以及与气候、地形等因素的关联，本研究利用时间序列分析方法以及一元线性回归方法描述了近20年来不同季节NEP的时空变化特征，并基于增强回归树（Boosted Regression Trees，BRT）分析气候因子和地形因子的贡献度。结果表明:（1）海南岛森林NEP表现出明显的季节性变化，整体来看近20年NEP呈现不显著的下降趋势，有机碳的变化率为?0.57 g·m?2 ·a（P>0.05）；海南岛森林在年际、干季、湿季3个时间尺度上均为碳汇状态，并且湿季的碳汇强度高于干季；空间上，年际NEP和湿季NEP呈显著增长趋势集中在海南岛东北部，呈显著下降趋势集中在海南岛中西部；（2）BRT的结果显示了海拔对于NEP的贡献度分别为年际（45.46%），干季（40.58%），湿季（21.88%）；（3）通过趋势相关性与多元线性回归分析，发现NEP与降雨有显著趋势相关性。海南岛低海拔森林NEP受温度和降水的影响。在干季时，降雨对海南岛低海拔森林NEP有显著的负向贡献，贡献度为?53%（P<0.05）；在湿季时，温度对海南岛低海拔森林NEP有显著的正向贡献，贡献度为90%（P<0.05）。
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| 关 键 词： | 热带森林 NEP 温度 降水 BRT |
| 收稿时间： | 2021-12-22 |
Analysis of seasonal spatial and temporal variation patterns of forest vegetation NEP and climate drivers in Hainan Island |
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| LIU Yingshuai,YU Rui,ZHENG Binbin,LIU Jiahui,SONG Qi,CHEN Ronghao,YAN Zhe.Analysis of seasonal spatial and temporal variation patterns of forest vegetation NEP and climate drivers in Hainan Island[J].Journal of Tropical Biology,2022,13(2):166-176. |
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| Authors: | LIU Yingshuai YU Rui ZHENG Binbin LIU Jiahui SONG Qi CHEN Ronghao YAN Zhe |
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| Affiliation: | 1.College of Ecology and Environment, Hainan University, Haikou, Hainan 5702282.Hainan Jisi Survey, Planning and Design Co., Ltd, Haikou, Hainan 570203, China |
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| Abstract: | An attempt was made to analyze the spatial and temporal variation of the net ecosystem productivity (NEP) of forests in Hainan Island and its association with climate and topography. The spatial and temporal variation patterns of NEP in different seasons over the past 20 years was analyzed by using time series analysis and one-dimensional linear regression methods, and the contribution of climate and topography factors was assessed based on Boosted Regression Trees (BRT). The results showed that the NEP of the forests in Hainan Island showed significant seasonal changes, and that the overall NEP showed a non-significant decreasing trend in the last 20 years, with a rate of change of ?0.57 g·m?2 ·a (P > 0.05). The forests in Hainan Island were carbon sinks at three time scales: interannual, dry season and wet season, and the intensity of carbon sinks in the wet season was higher than that in the dry season. Spatially, interannual NEP and wet-season NEP showed a significant increasing trend in the northeastern part of Hainan Island, and a significant decreasing trend in the central and western part of Hainan Island. The BRT analysis showed that the contribution of elevation to NEP was 45.46% (interannual), 40.58% (dry season), and 21.88% (wet season), respectively. The trend correlation and multiple linear regression analysis showed that NEP had significant trend correlation with precipitation. The NEP of low-elevation forests in Hainan Island was influenced by temperature and precipitation. In the dry season, precipitation had a significant negative contribution (?53%, P < 0.05) to the NEP of low elevation forests in Hainan Island, while in the wet season, temperature had a significant positive contribution (90%,P< 0.05) to the NEP of low elevation forests in Hainan Island. |
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