Analysis of Growing Season Normalized Difference Vegetation Index Variation and Its Influencing Factors on the Mongolian Plateau Based on Google Earth Engine

Yan, Yujie; Xin, Zhiming; Bai, Xiangzhi; Zhan, Hongbin; Xi, Jiaju; Xie, Jiancang; Cheng, Yiben

doi:10.3390/plants12132550

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…The Hurst index was originally developed by Harold Edwin Hurst , a British hydrologist, who found that biased random wandering (fractional Brownian motion) could successfully describe the long-term storage capacity of reservoirs when he was studying the relationship between the water flow and storage capacity of Nile River reservoirs [40]. Based on this, he proposed the Hurst index by using the rescaled polarity (R/S) analysis method as an indicator to determine whether the time-series data followed a random wandering or a biased random wandering process [41].…”

Section: Hurst Indexmentioning

confidence: 99%

Dynamic Change and Attribution Regarding Fractional Vegetation Coverage in Mengdong River Basin

Cao,

Wen

2024

Forests

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The situation of rocky desertification in the southwestern part of China is very serious and has been included as one of three major ecological problems. In this study, using Landsat images as the data sources, we estimated the fractional vegetation coverage (FVC) in the Mengdong River Basin in the Hunan Province over the past 40 years, analyzed its spatio-temporal variation characteristics, and explored the driving mechanism (climate and anthropogenic) using the Mann–Kendall, Hurst index, and partial correlation methods. Specifically, the impact of ecological engineering on the recovery of vegetation cover in rocky desertification areas was analyzed and discussed in this study. The results demonstrate the following: (1) The changes in FVC in the study area before and after the rocky desertification management ecological project differed significantly, with a very small change in the rate of change in the mean value of FVC between 1987 and 1999 (<0.1%), while the FVC had a significant linear growth trend between 2000 and 2022 (>0.9%). (2) The Hurst index of FVC ranged from −0.233 to 2.476, with an average value of 0.864. The area with an H value greater than 0.75 accounted for 80.12%, indicating that the future trend in the vast majority of regions will develop in accordance with the current change trend. (3) The average partial correlation coefficients between FVC and precipitation and between FVC and temperature were −0.02 and 0.27, respectively, showing that FVC is more sensitive to temperature than precipitation. The combination of climate change and human activities is the main cause of FVC change. The contributions of climate change (precipitation and temperature) and human activities to FVC variation are about 30% and 70%, respectively. Ecological restoration projects have a significant positive effect on the recovery of vegetation in rocky desertification areas. The results of this study are intended to provide a scientific basis for analyzing the characteristics of vegetation restoration in existing rocky desertification areas and ecological management in future rocky desertification areas.

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Section: Hurst Indexmentioning

confidence: 99%

Dynamic Change and Attribution Regarding Fractional Vegetation Coverage in Mengdong River Basin

Cao,

Wen

2024

Forests

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“…Studies have shown that these restoration activities can advance or delay the phenological phases of vegetation [23][24][25], making it more adaptable to local climatic conditions. Vegetation in desert areas often has a short phenological period [26], but ecological restoration projects can extend the growing season of plants by increasing land temperature and local annual precipitation [14,27,28], resulting in a longer phenological phase length [29]. The harsh climatic conditions in desert regions make vegetation phenology vulnerable to climate variations and human disturbance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ecological Restoration and Climate Change on Herbaceous and Arboreal Phenology

Yuan,

Cheng,

et al. 2023

Plants

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With global climate change, changes in vegetation phenology have become increasingly evident. Horqin Sandy Land is located near the eastern part of the West Liaohe River. It is the largest sandy land in China and its ecological environment is fragile. Investigating the changes in vegetation phenology in these sandy areas and determining the relationship between vegetation phenology and meteorological factors are of great importance for predicting the impacts of future climate change and understanding the response mechanisms of ecosystems. In this study, we used the time series of the Normalized Difference Vegetation Index (NDVI) from 2000 to 2021 and extracted the vegetation phenology in the Horqin Sandy Land using high-order curve fitting methods, including the start date of the growing season (SOS), the end date of the growing season (EOS), and the length of the growing season (LOS). We analyzed their temporal variation and used partial correlation analysis to determine their relationship with meteorological factors (temperature and precipitation). In addition, we compared the phenology and microclimate of forest and grassland within the study area. In the Horqin Sandy Land, the vegetation SOS was concentrated between the 115th and 150th day, the EOS was concentrated between the 260th and 305th day, and the LOS ranged from 125 to 190 days. Over the past 22 years, the SOS, EOS, and LOS of vegetation in the Horqin Sandy Land showed trends of delay, shift, and extension, with rates of change of 0.82 d/10a, 5.82 d/10a, and 5.00 d/10a, respectively. The start date of the growing season in the Horqin Sandy Land was mainly influenced by precipitation in April of the current year, while the end date was mainly influenced by precipitation in August of the current year. Overall, the SOS in the forested areas of the Horqin Sandy Land was slightly later than in the grasslands, but the EOS in the forested areas was significantly later than in the grasslands, resulting in a longer LOS in the forests. In addition, annual precipitation and the rate of precipitation increase were higher in the forested areas than in the grasslands, but soil temperature was higher in the grasslands than in the forests. Vegetation phenology in the Horqin Sandy Land has undergone significant changes, mainly manifested in the delayed end date of the growing season, the extended length of the growing season, and the differences between forest and grassland. This indicates that climate change has indeed affected phenological changes and provides a theoretical basis for subsequent ecological restoration and desertification prevention efforts in the region.

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“…Dramatic climate change has significantly affected vegetation growth during the past few decades. Global-or at least regional-greening has been observed with vegetation indexes [1][2][3][4][5][6][7][8]. Greening is closely related to carbon sequestration and thus possibly relieves global warming.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Precipitation Event Characteristics and Afforestation on the Greening in Arid Grasslands, China

Guo,

et al. 2023

Remote Sensing

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Global greening and its relationship with climate change remain the hot topics in recent years, and are of critical importance for understanding the interactions between the terrestrial ecosystem carbon cycle and the climate system. China, especially north China, has contributed a lot to global greening during the past few decades. As a water-limited ecosystem, human activities, not precipitation amount, were thought as the main contributor to the greening of north China. Considering the importance of precipitation event characteristics (PEC) in the altered precipitation regimes, we integrated long-term normalized difference vegetation index (NDVI) and meteorological datasets to reveal the role of precipitation regimes, especially PECs, on vegetation growth across temperate grasslands in north China. Accompanied with a significantly decreased growing season precipitation (GSP), NDVI increased significantly in the largest area of the temperate grasslands during 1982–2015, i.e., greening. We found that 28.44% of the area was explained by PECs, including more heavy or extreme precipitation events, alleviated extreme drought, and fewer light events, while only 0.92% of the area was associated with GSP. NDVI did not always increase over the 30 years and there was a decrease during 1996–2005. Taking afforestation projects in desertified lands into account, we found that precipitation, mainly PECs, explained more the increase and decline of NDVI during 1982–1995 and 1996–2005, respectively, while an equivalent explanatory power of precipitation and afforestation projects to the increase in NDVI after 2005. Our study indicates a possible higher productivity under future precipitation regime scenario (e.g., fewer but larger precipitation events) or intensive afforestation activity, implying more carbon sequestration or livestock production of temperate steppe in the future.

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Analysis of Growing Season Normalized Difference Vegetation Index Variation and Its Influencing Factors on the Mongolian Plateau Based on Google Earth Engine

Cited by 6 publications

References 39 publications

Dynamic Change and Attribution Regarding Fractional Vegetation Coverage in Mengdong River Basin

Dynamic Change and Attribution Regarding Fractional Vegetation Coverage in Mengdong River Basin

Effects of Ecological Restoration and Climate Change on Herbaceous and Arboreal Phenology

The Effects of Precipitation Event Characteristics and Afforestation on the Greening in Arid Grasslands, China

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