Title: A comprehensive analysis of the crop effect on the urban-rural differences in land surface phenology

Abstract

The response of land surface phenology (LSP) to the urban heat island effect (UHI) is a useful biological indicator for understanding how vegetated ecosystems will be affected by future climate warming. However, vegetation cover in rural areas is often dominated by cultivated land, whose phenological timing is considerably influenced by agricultural managements (e.g., timing of sowing and harvesting), leading to biased conclusions derived from the urban-rural LSP differences. To demonstrate this problem, we investigated the crop influence on the phenological response to a warmer environment resulting from the UHI effect. We partitioned cities in the United States into cultivated and non-cultivated categories according to the proportion of crops in rural areas. We then built continuous buffer zones starting from the urban boundary to explore the urban-rural LSP differences considering the UHI effect on them. In this work, the results suggest crop inclusion is likely to lead to >14 days of urban-rural differences at both the start of the season (SOS) and the end of the season (EOS) between cultivated and non-cultivated cities. The temperature sensitivity (ST) of SOS is overestimated by approximately 2.7 days/°C, whereas the EOS is underestimated by 3.6 days/°C. Removing crop-dominated pixels (i.e., above 50 %) canmore » minimize the influence of crop planting/harvesting on LSP and derive reliable results. We, therefore, suggest explicit consideration of crop impacts in future studies of phenological differences between urban and rural areas and the UHI effect on LSP in urban domains, as presented by this comprehensive study.« less

Authors:

Yin, Peiyi ^[1]; Li, Xuecao ^[2]; Mao, Jiafu  ^[3];

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Johnson, Brian A. ^[4]; Wang, Bingyu ^[5]; Huang, Jianxi ^[6]

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+ Show Author Affiliations

1. China Agricultural University, Beijing (China)
2. China Agricultural University, Beijing (China); Ministry of Agriculture and Rural Affairs, Beijing (China)
3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
4. Institute for Global Environmental Strategies, Hayama, Kanagawa (Japan)
5. Univ. of Tokyo (Japan)
6. China Agricultural University, Beijing (China); Ministry of Agriculture and Rural Affairs, Beijing (China)

Publication Date:

Fri Dec 02 00:00:00 EST 2022

Research Org.:

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

National Natural Science Foundation of China (NSFC); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)

OSTI Identifier:

1902796

Alternate Identifier(s):

OSTI ID: 1960854

Grant/Contract Number:  

AC05-00OR22725; 10844

Resource Type:

Accepted Manuscript

Journal Name:

Science of the Total Environment

Additional Journal Information:

Journal Volume: 861; Journal ID: ISSN 0048-9697

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES; LSP; Urbanization; Urban heat island effect; Urban-rural phenology; Remote sensing