基于Landsat 8影像的南京市热岛效应对植物物候的影响

王彦超; 朱一丹; 徐丹丹

doi:10.3969/j.issn.1000-2006.201710024

王彦超,朱一丹,徐丹丹

南京林业大学学报（自然科学版） ›› 2018, Vol. 42 ›› Issue (06) : 99-105.

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南京林业大学学报（自然科学版） ›› 2018, Vol. 42 ›› Issue (06) : 99-105. DOI: 10.3969/j.issn.1000-2006.201710024

研究论文

基于Landsat 8影像的南京市热岛效应对植物物候的影响

王彦超¹,朱一丹²,徐丹丹^1*

作者信息 +

The impact of urban heat island of Landsat 8 OLI on plant phenology in Nanjing

WANG Yanchao¹,ZHU Yidan²,XU Dandan^1*

Author information +

文章历史 +

摘要

【目的】在城市化高速发展的今天,城市热岛效应显著。城市绿地可以有效地缓解城市热岛效应,城市热岛由于长期高温作用也会对绿化植物的物候产生影响。该文旨在基于遥感数据,通过对比城市热岛区和非热岛区的植被物候特征研究城市热岛效应对城市绿化植物物候的影响。【方法】对Landsat 8影像数据进行地表温度的反演,划分地表温度等级,对地表温度进行空间分析确定热岛区域,进而选取热岛区域及热岛区和非热岛区植被,并使用中分辨率成像光谱仪(MODIS)数据作出热岛与非热岛区植被的归一化植被指数(NDVI)曲线,以此分析对比热岛区和非热岛区植被物候的差异。【结果】南京市热岛区植物生长季开始的时间(SOG)比非热岛区早,而热岛区植物生长季结束的时间(EOG)比非热岛区晚; 热岛区植物生长期比非热岛区植物生长期长20 d。此外,研究结果还表明夏季热红外影像更为适合划分热岛区。【结论】绿化植物适应长期城市热岛效应高温的表现为生长季开始的时间提前,结束的时间推后,整个生长季的时间加长。

Abstract

【Objective】Currently, there is considerable interest in the issues of urban heat island because of the rapid pace of urban sprawl. Urban green land has the potential to reduce land surface temperature, but vegetation phenology is affected by long-term high temperatures in the urban heat island. In this study, we aimed to research the effects of urban heat island on vegetation phenology by comparing the vegetation phenology within and outside the urban heat island of Nanjing City. 【Method】To achieve this goal, the thermal bands of Landsat 8 images were used to estimate the land surface temperature, and the hot and cold spots of the land surface temperature were spatially analyzed to identify the urban heat island, which is a cluster of high land surface temperatures(hot spot of temperature)in Nanjing. The start and end of the growing season for vegetation inside and outside the urban heat island were estimated using Normalized Difference Vegetation Index(NDVI)curve extracted from MOD13Q1 images. 【Result】The results show that the images of the land surface temperature in summer were more effective in identifying the urban heat island. The start of the growing season of the vegetation on the urban heat island is earlier than that of the vegetation outside the urban heat island, and the end of the growing season in urban heat island is later than that outside the heat island. The growing season of the vegetation on the urban heat island of Nanjing is 20 days longer than that of the vegetation outside the urban heat island. 【Conclusion】The phenomena for green vegetation to adapt to the long-term urban heat island effects are that the start of the growing season is earlier, the end of the growing season is later, and the growing season is longer.

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王彦超,朱一丹,徐丹丹. 基于Landsat 8影像的南京市热岛效应对植物物候的影响[J]. 南京林业大学学报（自然科学版）. 2018, 42(06): 99-105 https://doi.org/10.3969/j.issn.1000-2006.201710024

WANG Yanchao,ZHU Yidan,XU Dandan. The impact of urban heat island of Landsat 8 OLI on plant phenology in Nanjing[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2018, 42(06): 99-105 https://doi.org/10.3969/j.issn.1000-2006.201710024

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