利用多年多源数据对印度特里普拉邦（Tripura）的橡胶扩展和年龄层绘图进行研究（1990-2021 年）

Rubber expansion and age-class mapping in the state of Tripura (India) 1990-2021 using multi-year and multi-sensor data.

机构信息

School of Natural Sciences and Engineering, National Institute of Advanced Studies (NIAS), Indian Institute of Science (IISC) Campus, Bengaluru, Karnataka, 560012, India.

Forest Biodiversity and Ecology Division, National Remote Sensing Centre, ISRO, Balanagar, Hyderabad, 500 037, India.

出版信息

Environ Monit Assess. 2023 Jan 31;195(2):348. doi: 10.1007/s10661-023-10942-2.

DOI:10.1007/s10661-023-10942-2

PMID:36719637

Abstract

The present study focuses on the spread of rubber monoculture in the state of Tripura during past three decades (1990-2021) in the northeast region of India which is known for its rich biodiversity, shifting cultivation, and extensive forest dynamics. Earth observation (EO) data of seven time periods from Landsat missions (1990, 1995, 2000, 2004, and 2009) and Sentinel-2 (2016 and 2021) were the main source for mapping and were supplemented with MODIS-EVI temporal spectral profiles, GEDI-derived vegetation heights (2019), and Google Earth high-resolution historical images for additional cues to support discrimination, mapping, and accuracy assessment. The methodology for rubber used its unique phenology from spectral-temporal profile and multi-year comparison of patches and their dynamics for age-class mapping. The results indicate that in the state of Tripura (geographic area 1.08 Mha), the area under rubber increased from 0.3% in 1990 to 8.9% of the geographic area in 2021. The overall classification accuracy for the maps created for the years 1990, 1995, 2000, 2004, 2009, 2016, and 2021 was 84.2%, 83.9%, 84.8%, 88.0%, 86.0%, 86.7%, and 89.5%, respectively. New areas under rubber originated from various land cover classes including open forests, shifting cultivation lands, and scrub. Recent expansion has resulted in 84.3% of rubber plantations under the 10-year age class. Implications of this transformation of the natural landscape, biodiversity and biomass, and carbon pool assessment are discussed.

摘要

本研究聚焦于过去三十年（1990-2021 年）印度东北部的特里普拉邦橡胶单一栽培的传播情况，该邦以其丰富的生物多样性、轮作农业和广泛的森林动态而闻名。本研究主要使用来自陆地卫星任务（1990 年、1995 年、2000 年、2004 年和 2009 年）和哨兵-2（2016 年和 2021 年）的七个时间周期的地球观测（EO）数据进行制图，并辅以 MODIS-EVI 时间光谱曲线、GEDI 衍生的植被高度（2019 年）和谷歌地球高分辨率历史图像，以提供更多的线索来支持区分、制图和准确性评估。在橡胶的方法中，使用了其独特的物候学特征，从光谱-时间剖面和多年来的斑块及其动态比较来进行年龄类别的制图。结果表明，在特里普拉邦（地理面积 1.08 万平方公里），橡胶种植面积从 1990 年的 0.3%增加到 2021 年的 8.9%。为 1990 年、1995 年、2000 年、2004 年、2009 年、2016 年和 2021 年创建的地图的总体分类准确性分别为 84.2%、83.9%、84.8%、88.0%、86.0%、86.7%和 89.5%。新的橡胶种植区源自各种土地覆盖类别，包括开阔森林、轮作农业土地和灌丛。最近的扩张导致 84.3%的橡胶种植园处于 10 年的年龄阶段。讨论了这种自然景观、生物多样性和生物量以及碳储量评估的变化所带来的影响。