生态环境学报 ›› 2026, Vol. 35 ›› Issue (5): 702-713.DOI: 10.16258/j.cnki.1674-5906.2026.05.004

• 碳循环与碳减排专栏 • 上一篇    下一篇

基于岩性分区的广西植被净生态系统生产力时空演变特征研究

张涛1,2(), 杨慧3,*(), 曹建华1,4, 周孟霞1,4, 康志强5,*()   

  1. 1 中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室/联合国教科文组织国际岩溶研究中心广西 桂林 541004
    2 桂林理工大学环境科学与工程学院广西 桂林 541006
    3 云南大学地球科学学院云南 昆明 650500
    4 广西平果喀斯特生态系统国家野外科学观测研究站广西 平果 531406
    5 广西壮族自治区地质矿产勘查开发局地球关键带碳循环重点实验室广西 南宁 530000
  • 收稿日期:2025-06-18 修回日期:2025-11-18 接受日期:2025-12-12 出版日期:2026-05-18 发布日期:2026-05-08
  • 通讯作者: *E-mail: karstyanghui@163.comzqkang000@126.com
  • 作者简介:张涛(1998年生),男,硕士研究生,主要从事岩溶区水文生态耦合过程研究。E-mail: sdlwzt1206@163.com
  • 基金资助:
    国家重点研发计划项目(2023YFD1902801);广西重点研发计划项目(桂科AB25069497);国家自然科学基金项目(42361144885);国家自然科学基金项目(42271094)

Study on the Spatiotemporal Evolution Characteristics of Vegetation Net Ecosystem Productivity in Guangxi Based on Lithological Zoning

ZHANG Tao1,2(), YANG Hui3,*(), CAO Jianhua1,4, ZHOU Mengxia1,4, KANG Zhiqiang5,*()   

  1. 1 Karst Dynamics Laboratory, MLR/Institute of Karst Geology, Chinese Academy of Geological Sciences/UNESCO International Research Centre on Karst, Guilin 541004, P. R. China
    2 College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, P. R. China
    3 School of Earth Sciences, Yunnan University, Kunming 650500, P. R. China
    4 Guangxi Pingguo Karst Ecosystem National Observation and Research Station, Pingguo 531406, P. R. China
    5 Key Laboratory for Carbon Cycle and Environmental Sustainability in the Earth’s Critical Zone, Guangxi Bureau of Geology and Mineral Prospecting and Exploitation, Nanning 530000, P. R. China
  • Received:2025-06-18 Revised:2025-11-18 Accepted:2025-12-12 Online:2026-05-18 Published:2026-05-08

摘要:

植被净生态系统生产力(NEP)是衡量陆地生态系统碳源/汇功能的核心指标,其时空演变特征研究对区域碳中和意义重大。岩性作为地表物质组成基础单元,深刻影响NEP,但当前NEP研究多聚焦气候与植被耦合,对岩性分异的时空演变特征关注不足。基于1981-2020年中国NEP栅格数据及岩性分区资料,结合Theil-Sen趋势分析与Mann-Kendall检验,系统揭示广西NEP的时空演变规律及其与岩性的关联机制。结果显示:1)时间维度上,广西年NEP均值呈先降后升阶段性特征,1981-1991年波动下降,1991-2020年波动上升(2000年后增速显著),40年间均值范围211.35-279.56 g·m−2·a−1(以C计);2)空间格局上,碳源区集中于中部及南部部分地区,碳汇区分布于北部及西部(东南部碳汇强度高于西北部);2000-2020年,60.08%区域NEP显著增加(西北部为核心增长区),东部、东北部及西南部分地区NEP下降,碳汇功能退化;3)岩性差异显著影响NEP分异,岩溶区NEP均值(154.04-226.23 g·m−2·a−1)低于非岩溶区(253.40-313.33 g·m−2·a−1),但NEP增长速率更快;石灰岩区因石漠化治理与树种优化,2011年后反超白云岩区。研究揭示了岩性对NEP时空格局的关键调控作用,明确了不同岩性背景下生态恢复措施对碳汇提升的成效,可为岩溶地区制定差异化生态管理策略、增强区域碳汇功能提供科学支撑。

关键词: 广西岩溶区, 植被净生态系统生产力, 时空演变, 岩性分异, 趋势分析

Abstract:

Net Ecosystem Productivity (NEP) serves as a key indicator for assessing carbon source/sink dynamics in terrestrial ecosystems, and understanding the evolution of its spatiotemporal heterogeneity and driving mechanisms is highly significant for regional carbon neutrality. Although lithology, as a fundamental unit of surface material composition, profoundly influences NEP, current research predominantly focuses on climate-vegetation interactions, while the spatiotemporal evolutionary characteristics of lithologically-driven effects have received insufficient attention. Leveraging China’s gridded NEP data (1981-2020) and lithological zoning maps, this study systematically elucidates the spatiotemporal evolution of NEP in Guangxi and its association with lithology using Theil-Sen trend analysis and Mann-Kendall tests. The results showed that: 1) Temporally, annual mean NEP exhibited a “decline-then-rise” trend. Fluctuating decreases were observed from 1981 to 1991, followed by a significant accelerated increase post-2000 (1991-2020). Over the 40 years, NEP values ranged between 211.35 and 279.56 g·m−2·a−1. 2) Spatially, carbon source areas were concentrated in central and southern Guangxi, while carbon sinks dominated northern and western regions (with stronger sequestration intensity in the southeast). From 2000 to 2020, NEP significantly increased in 60.08% of the regions (the northwest was the core growth area), while NEP decreased in some areas in the eastern, northeastern and southwestern regions, and the carbon sink function deteriorated. 3) Lithologic disparities significantly influenced NEP differentiation. Karst areas exhibited lower mean NEP values (154.04-226.23 g·m−2·a−1) compared to non-karst regions (253.40-313.33 g·m−2·a−1), yet demonstrated a faster recovery rate. Due to rocky desertification control and tree species optimization, limestone areas surpassed dolomite zones in NEP after 2011. This study elucidates the critical regulatory role of lithology in shaping the spatiotemporal patterns of NEP, and demonstrates the effectiveness of ecological restoration measures in enhancing carbon sequestration across different lithological settings. These findings provide scientific support for developing tailored ecological strategies to strengthen regional carbon sink capacity in karst regions.

Key words: Guangxi karst areas, net ecosystem productivity, spatiotemporal evolution, lithological differentiation, trend analysis

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