Multi-Scale Influence and Time-Lag Effect Analysis of Precipitation Process on Vegetation Diversity of Grassland in Poyang Lake

IF 2.1 3区 环境科学与生态学 Q2 ECOLOGY
Ecohydrology Pub Date : 2025-08-12 DOI:10.1002/eco.70088
Yuanyuan Ding, Wenbo Chen, Zhuozhao Chen
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引用次数: 0

Abstract

Precipitation significantly alters the structure and stability of wetland vegetation ecosystems, particularly under increasing global climate change. Analysing the multi-scale mechanism and ecological effects of precipitation on wetland vegetation diversity patterns is crucial for wetland ecological restoration and biodiversity conservation. Based on the analysis of spatiotemporal heterogeneity and variation of the precipitation process, this paper constructed a high spatiotemporal resolution vegetation dynamic dataset of Poyang Lake by integrating multi-source remote sensing data and a machine learning method, and reveals the multi-scale influences and time lag effects of the precipitation process on the vegetation diversity pattern. The results showed as follows: (1) The spatial distribution of precipitation in Poyang Lake was unbalanced, and exhibited an overall increasing trend, with the precipitation intensity index showing non-stationary characteristics relatively. (2) From 2000 to 2020, vegetation diversity exhibited significant spatiotemporal heterogeneity. Increased vegetation landscape dominance was associated with a decrease in diversity and evenness indices, shifting the landscape distribution from balanced to unbalanced. (3) Vegetation diversity exhibited a notable lag in its response to precipitation, with the timing and magnitude of the response varying depending on the precipitation distribution and timescale. At the monthly scale, precipitation exhibited a negative correlation with Shannon diversity index (SHDI), Shannon evenness index (SHEI) and richness index (PT), but a positive correlation with Shannon dominance index (DI). The response intensity of the vegetation diversity pattern to precipitation followed the order: precipitation of month (PM), maximum 5-day precipitation amount (RX5day), and maximum 1-day precipitation amount (RX1day). The response of the vegetation diversity pattern to PM displayed both time-lag and cumulative effects. At the annual scale, annual total wet days precipitation (PRCPTOT) and precipitation frequency indices (R20, R25) significantly influenced the vegetation diversity pattern within the same year. The precipitation intensity index exerted a significant influence on the vegetation diversity pattern primarily with a 3–4 year lag. The influence of the precipitation process on the vegetation diversity pattern has a strong relationship with its instability characteristics. Our findings can offer valuable insights for the conservation and restoration of wetland vegetation diversity, and provide a scientific foundation for the sustainable management of the lake ecosystem.

降水过程对鄱阳湖草地植被多样性的多尺度影响及时滞效应分析
降水显著改变湿地植被生态系统的结构和稳定性,特别是在全球气候变化加剧的情况下。分析降水对湿地植被多样性格局的多尺度机制和生态效应,对湿地生态恢复和生物多样性保护具有重要意义。在分析降水过程时空异质性和变异的基础上,采用多源遥感数据与机器学习相结合的方法构建了鄱阳湖高时空分辨率植被动态数据集,揭示了降水过程对鄱阳湖植被多样性格局的多尺度影响和时滞效应。结果表明:(1)鄱阳湖降水空间分布不平衡,总体呈增加趋势,降水强度指数相对呈非平稳特征;(2) 2000 - 2020年,植被多样性呈现明显的时空异质性。植被景观优势度增加,多样性和均匀度指数下降,景观分布由平衡向不平衡转变。(3)植被多样性对降水的响应具有明显的滞后性,响应的时间和幅度随降水分布和时间尺度的不同而不同。在月尺度上,降水量与Shannon多样性指数(SHDI)、Shannon均匀度指数(SHEI)和Shannon丰富度指数(PT)呈负相关,与Shannon优势度指数(DI)呈正相关。植被多样性格局对降水的响应强度依次为月降水量(PM)、最大5天降水量(RX5day)、最大1天降水量(RX1day)。植被多样性格局对PM的响应既有时滞效应,也有累积效应。在年尺度上,年总降水量(PRCPTOT)和降水频率指数(R20、R25)对同一年内植被多样性格局有显著影响。降水强度指数对植被多样性格局的影响主要存在3 ~ 4年的滞后效应。降水过程对植被多样性格局的影响与其不稳定性特征密切相关。研究结果可为湿地植被多样性的保护与恢复提供有价值的见解,并为湖泊生态系统的可持续管理提供科学依据。
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来源期刊
Ecohydrology
Ecohydrology 环境科学-生态学
CiteScore
5.10
自引率
7.70%
发文量
116
审稿时长
24 months
期刊介绍: Ecohydrology is an international journal publishing original scientific and review papers that aim to improve understanding of processes at the interface between ecology and hydrology and associated applications related to environmental management. Ecohydrology seeks to increase interdisciplinary insights by placing particular emphasis on interactions and associated feedbacks in both space and time between ecological systems and the hydrological cycle. Research contributions are solicited from disciplines focusing on the physical, ecological, biological, biogeochemical, geomorphological, drainage basin, mathematical and methodological aspects of ecohydrology. Research in both terrestrial and aquatic systems is of interest provided it explicitly links ecological systems and the hydrologic cycle; research such as aquatic ecological, channel engineering, or ecological or hydrological modelling is less appropriate for the journal unless it specifically addresses the criteria above. Manuscripts describing individual case studies are of interest in cases where broader insights are discussed beyond site- and species-specific results.
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