An inflection point-based method for estimating metrics of mangrove phenology combining climatic factors and Landsat NDVI time series

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-04-12 DOI:10.2166/wcc.2024.463

Mounika Manne, R. K.

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引用次数: 0

Abstract

The present research evaluated the prospects of utilizing rainfall and temperature combined with Landsat-8 derived HANTS (Harmonic ANalysis of Time Series) reconstructed NDVI for estimating the metrics of the mangrove phenology. The selected period of the study was from 2013 to 2020 for the Pichavaram mangroves of Tamil Nadu. The NDVI and ERA5 (ECMWF Re-Analysis) datasets of rainfall and temperature were the input datasets for developing the new algorithm. The ‘z-score sum’ provided a measure of the cumulative impact of rainfall and temperature, displaying its most negative value coinciding with the peak positive value of the NDVI time series datasets. The algorithm developed for phenological metrics estimation identified the common inflection points of the z-score sum and NDVI curves. The temporal analysis of metrics revealed the average Length of Season (LoS) as 230 days. The metrics also identified the drought year 2016 with the shortest LoS and the least Gross Primary Productivity (GPP) values. The analysis showed the influences of the preceding year’s monsoon rainfall on the GPP values of the later part of the phenological cycle. The temperatures during the days of PoS were found to be the optimum temperature for the growth of mangroves.

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基于拐点的方法，结合气候因子和 Landsat NDVI 时间序列估算红树林物候指标

本研究评估了利用降雨量和温度结合大地遥感卫星 8 号得出的 HANTS（时间序列谐波分析）重建 NDVI 估算红树林物候指标的前景。泰米尔纳德邦 Pichavaram 红树林的研究时间为 2013 年至 2020 年。NDVI 和 ERA5（ECMWF 再分析）降雨量和温度数据集是开发新算法的输入数据集。z 分值总和 "提供了降雨量和温度累积影响的衡量标准，其显示的最大负值与 NDVI 时间序列数据集的正值峰值相吻合。为估算物候指标而开发的算法确定了 zcore sum 和 NDVI 曲线的共同拐点。指标的时间分析表明，平均季节长度（LoS）为 230 天。这些指标还确定了 2016 干旱年的季节长度（LoS）最短，初级生产力总值（GPP）最小。分析表明，前一年的季风降雨量对物候周期后期的 GPP 值有影响。研究发现，物候期当天的温度是红树林生长的最佳温度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.