Author(s)

Zijia Liu ¹, Changhua Liu ¹

Affiliation(s)

¹ School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

Corresponding Author

Changhua Liu

ABSTRACT

To study the spatio-temporal variation of drought in Henan Province, the Enhanced Vegetation Condition Index (EVCI) was calculated using monthly MODIS EVI data with a 1 km resolution. Trend analysis, frequency analysis and Hurst index methods were applied to the spatio-temporal variation characteristics in Henan Province. The following results were attained. (1)The EVCI in Henan Province exhibited an upward trend from 2001 to 2023, with 92.4% of the area showing positive trend values, indicating that drought conditions in most of the study area have been alleviating year by year.(2)The drought occurrence frequency ranged from 0.14 to 0.87, with 81.9% of the area having a drought frequency below 0.6.Compared to 2001, and the proportion of drought-affected areas in 2023 decreased by 26.1%.(3)The Hurst index analysis indicates that in the future, EVCI would show weak anti-continuity changes in the northeastern region and weak continuity changes in the southern region. It suggests a weak ability to sustain drought alleviation, and ecological management should be emphasized.

KEYWORDS

MODIS, Drought, EVCI, spatio-temporal variation characteristics

CITE THIS PAPER

Zijia Liu, Changhua Liu, Study on the Spatial-temporal Variation Characteristics of Drought in Henan Based on Enhanced Vegetation Condition Index from 2001 to 2023. Environment, Resource and Ecology Journal (2024) Vol. 8: 83-90. DOI: http://dx.doi.org/10.23977/erej.2024.080212.

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