Comparison of Phenological Parameters Extracted from SIF, NDVI and NIRv Data on the Mongolian Plateau

Cha, Ersi; Tubuxin, Bayaer; Bao, Yuhai; Yong, Mei; Lai, Quan; Zhang, Xiang; Zhang, Yusi

doi:10.3390/rs15010187

Cited by 7 publications

(6 citation statements)

References 66 publications

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“…For the areas with increasing trends, 33.68% of the total area showed significant increase, and 56.1% of the total areas showed no significant increase. GPP was highly correlated with the LAI, and SIF-GPP could show more details than the LAI, especially in the forest area (Ersi et al, 2023).…”

Section: Spatial and Temporal Distribution And Changing Trends Of Gpp...mentioning

confidence: 93%

Increasing precipitation promoted vegetation growth in the Mongolian Plateau during 2001–2018

et al. 2023

Front. Environ. Sci.

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Taking the Mongolian Plateau as the research area, this paper studied the vegetation growth from 2001 to 2018. We quantified the vegetation growth changes based on changes in gross primary productivity (GPP) and leaf area index (LAI) and their relationships to climate variables using correlation analysis, partial correlation analysis and multiple correlation analysis. The results showed that from 2001 to 2018 both GPP and LAI showed an increasing trend, with great heterogeneities among different areas and land cover types. The largest increase of GPP and LAI occurred in the northeast plateau with the land cover types of forest and cropland. The main driving factor of vegetation growth was precipitation, while temperature was significantly negatively correlated with vegetation growth. The CO2 concentration had a significant impact on the GPP in farmland, and the increase of solar radiation had a significant impact on tundra. Our study highlights the importance of precipitation in regulating vegetation growth in the Mongolian Plateau, challenging the prevailing views that the temperature dominates the vegetation growth in the northern ecosystems.

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Section: Spatial and Temporal Distribution And Changing Trends Of Gpp...mentioning

confidence: 93%

Increasing precipitation promoted vegetation growth in the Mongolian Plateau during 2001–2018

et al. 2023

Front. Environ. Sci.

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“…In all study regions and for cereal crops, the SOS occurs in autumn, and the EOS occurs in summer of the following year [56][57][58][59][60][61]; therefore, the agricultural year was considered to extend from 1 September to 31 August of the following year. The SOS and EOS dates were retrieved at the pixel scale, and the amplitude thresholds were defined to be 20% according to the methodology used in several studies [14,20,62,63]. The calculations of SOS and EOS thresholds are summarized in Equation (5).…”

Section: Phenology Parameter Extractionmentioning

confidence: 99%

Recent Cereal Phenological Variations under Mediterranean Conditions

Benito-Verdugo,

González-Zamora,

Martínez-Fernández

2024

Remote Sensing

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This study analyzes the temporal patterns of rainfed cereal phenology extracted from the GIMMS NDVI3g dataset in the main cereal-growing regions under a Mediterranean climate in Spain, Portugal, France and Italy during the period 1982–2022. The series before and after the beginning of the 21st century were analyzed separately. Phenological parameters were extracted using the modified dynamic threshold method, and their trends were analyzed. Correlation analyses were performed to study the relationships among these parameters and to analyze the influence of hydroclimatic variables on the start (SOS) and end (EOS) of the growing season. Results showed a temporal reversal in phenological trends between both study periods, coinciding with the global warming hiatus. In the first period (1982–2002), SOS and EOS advanced (−7.5 and −3.1 days, respectively), and the length of growing season (LOS) increased. However, during the second stage (2003–2022), SOS and EOS were delayed (7.5 and 1.7 days, respectively), and LOS decreased. Similar dynamics were observed for the influence of the hydroclimatic variables on SOS and EOS, stronger in the first period and weaker in the second. This study provides valuable information on the phenological dynamics of rainfed cereals that may be useful for their management and planning in climate change scenarios.

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“…The EVI is calculated on the basis of nearinfrared reflectance, red reflectance, and blue reflectance (400-460 nm), which can effectively reduce the atmospheric and soil noise effects and is often used to reveal vegetation changes in areas with high vegetation cover [47]. The NIR v is a recently developed vegetation index, calculated from NDVI and near-infrared reflectance, which can reflect vegetation phenology information; however, the response to climate elements is not clear [48,49].…”

Section: Indicator Selectionmentioning

confidence: 99%

Spatio-Temporal Pattern of Urban Green Space in Chengdu Urban Center under Rapid Urbanization: From the Policy-Oriented Perspective

Li,

Du,

Yang

et al. 2024

Land

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Urban green space (UGS) is increasingly recognized as a nature-based solution to achieving urban sustainable development. Under rapid urbanization, greening policies are often the main driving factor behind the restoration or even growth of UGS. In this study, Chengdu, the pioneering “park city” in China, is chosen as a representative region. Based on land use/land cover (LULC) and normalized difference vegetation index (NDVI) data, indicators that can reflect both UGS quantity and quality are constructed and the spatio-temporal characteristics of UGS in original and expanding urban areas are also explored at different greening policy stages. The findings show that, from 2000 to 2022, the basic trend of UGS reduction during urbanization remained unchanged, despite the greening policies implemented in Chengdu. However, the original urban area has evolved into a new urban area. This has been achieved by integrating the expanded urban area with higher greening rates, resulting in the greening rate in 2022 (44.61%) being restored to the 2000 level (44.21%). The implementation of green policies in Chengdu is primarily reflected in improved UGS quality, especially in the stage of the ecological garden city construction (2008–2018). Specifically, the UGS quality in the original urban area has been improved by 25.25%. Overall, the UGS quality in Chengdu Urban Center has improved, changing from a medium level in 2000 to a medium-high level in 2022. The construction of a national demonstration zone of the park city provides an opportunity for the UGS quantity to increase and quality to improve in Chengdu in the future. However, effectively considering the development positioning of the Tianfu Granary to coordinate the relationship between UGS and high-quality farmland is a huge challenge for urban sustainable development in Chengdu.

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Comparison of Phenological Parameters Extracted from SIF, NDVI and NIRv Data on the Mongolian Plateau

Cited by 7 publications

References 66 publications

Increasing precipitation promoted vegetation growth in the Mongolian Plateau during 2001–2018

Increasing precipitation promoted vegetation growth in the Mongolian Plateau during 2001–2018

Recent Cereal Phenological Variations under Mediterranean Conditions

Spatio-Temporal Pattern of Urban Green Space in Chengdu Urban Center under Rapid Urbanization: From the Policy-Oriented Perspective

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