Different Urbanization Levels Lead to Divergent Responses of Spring Phenology

IF 1 4区 地球科学 Q4 GEOGRAPHY, PHYSICAL
Chaoya Dang, Zhenfeng Shao, Xiao Huang, Gui Cheng, Jiaxin Qian
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引用次数: 0

Abstract

Urban vegetation phenology is important for understanding the relationship between human activities on urban ecosystems and carbon cycle. The relationship between urban and rural vegetation phenology and environmental and meteorological factors were studied across urban-rural gradients. However, the relationship of intra-urban urbanization intensity (UI) gradients on vegetation at the start of season (SOS) is unclear. Here, we used remote sensing data to quantitatively assess the relationship of vegetation SOS to UI gradients at mid-high latitudes in the northern hemisphere. The results showed that urban area vegetation SOS widely presented earlier than for rural area vegetation. Across the cities we investigated the extent UI gradient was prevalent as a threshold (33.2% ± 2.3%) of surface temperature to SOS advance enhancement and offset. At low urbanization enhanced surface temperature on sos advances, while at high urbanization offset surface temperature on SOS advances. Overall, UI demonstrated a nonlinear relationship with sos. The results of this study suggest that there may be thresholds of impact on vegetation SOS in future global climate and environment change processes, where opposite effects can occur below and above thresholds.
不同城市化水平对春季物候的响应存在差异
城市植被物候对理解人类活动对城市生态系统的影响与碳循环之间的关系具有重要意义。在城乡梯度上研究了城乡植被物候与环境气象因子的关系。然而,城市内部城市化强度(UI)梯度与季初植被的关系尚不清楚。本文利用遥感数据定量评价了北半球中高纬度地区植被SOS与UI梯度的关系。结果表明,城市植被SOS出现的时间普遍早于农村植被。在各个城市,我们调查了UI梯度作为地表温度对SOS提前增强和偏移的阈值(33.2%±2.3%)的普遍程度。城市化程度低时,地表温度对sos推进有增强作用,城市化程度高时,地表温度对sos推进有抵消作用。总体而言,UI与sos呈现非线性关系。本研究结果表明,在未来全球气候和环境变化过程中,可能存在影响植被SOS的阈值,在阈值以下和阈值以上可能发生相反的影响。
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来源期刊
Photogrammetric Engineering and Remote Sensing
Photogrammetric Engineering and Remote Sensing 地学-成像科学与照相技术
CiteScore
1.70
自引率
15.40%
发文量
89
审稿时长
9 months
期刊介绍: Photogrammetric Engineering & Remote Sensing commonly referred to as PE&RS, is the official journal of imaging and geospatial information science and technology. Included in the journal on a regular basis are highlight articles such as the popular columns “Grids & Datums” and “Mapping Matters” and peer reviewed technical papers. We publish thousands of documents, reports, codes, and informational articles in and about the industries relating to Geospatial Sciences, Remote Sensing, Photogrammetry and other imaging sciences.
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