Growth Hormone Deficiency

Guli, Laura A.

doi:10.1002/9781118660584.ese1062

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…Guan et al [27] confirmed that the decreasing trends in NDVI observed in vicinity areas of cities were attributed to urbanization, industrialization, or the construction of rural settlements, which increased rapidly by mainly encroaching on croplands or grasslands [71]. The expansion of agricultural oases was identified as an important factor for promoting vegetation greening in northwest China (including the Hexi region) [57,72]. Owing to insufficient precipitation and high evaporation, vegetation conditions in dryland regions were largely constrained by available water resources and the treatment programs of the river basin, e.g., STPHRB and CTPSRB contributed greatly to vegetation changes.…”

Section: Discussionmentioning

confidence: 94%

Driving Factors of Recent Vegetation Changes in Hexi Region, Northwest China Based on a New Classification Framework

et al. 2020

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Since other factors (soil properties, topography, etc.) under natural conditions are relatively invariant over one or two decades, climate variables (precipitation and temperature) and human activities are the two fundamental factors driving vegetation changes in global or large-scale areas. However, the combined effects of either single climatic factor and human activities on vegetation changes and the role of human activities itself in a specific region has not been fully discussed. In this study, the Hexi region, a typical dryland consisting of three inland river basins in northwest China was selected as a case area. A new classification framework combining Pearson correlation analysis and residual trend approach was proposed to assess their individual and conjoint contributions of climate variables and human activities in areas of significant vegetation changes. Our results indicated that most of vegetation covered areas in the Hexi region experienced significant changes during the period 2001−2017, and vegetation improvements were widespread except the interior of oases; significant changes in vegetation caused by human activities, precipitation, the interactions of precipitation and human activities, temperature, the interactions of temperature and human activities, the interactions of temperature and precipitation, and the interactions of the three factors accounted for 50.46%, 16.39%, 19.90%, 4.33%, 2.32%, 2.11%, and 4.49% of the total change areas, respectively. Generally, the influence of temperature was relatively weaker than that of precipitation, and the contributions of the interactions of climate variables and human activities on vegetation changes were greater than that of climate contributions alone. Moreover, the results of various investigations, according to the trends and the time of vegetation changes, indicate that decreasing trends of the normalized difference vegetation index (NDVI) in the Hexi region were chiefly attributed to the adjustments of agricultural planting structure while the comprehensive treatment programs implemented in river basins supported a large proportion of vegetation improvements.

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Section: Discussionmentioning

confidence: 94%

Driving Factors of Recent Vegetation Changes in Hexi Region, Northwest China Based on a New Classification Framework

et al. 2020

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“…We performed a Theil-Sen median trend analysis combined with the Mann-Kendall test to identify trends in large sets of time series data; this combination has been used to analyze long time series of climate and vegetation data [2,53,54]. Because abnormal values have less influence, the Theil-Sen median trend analysis has been proven to be more suitable than linear regression [55][56][57], and the computational formula is as follows:…”

Section: Theil-sen Median Trend Analysismentioning

confidence: 99%

“…The responses of vegetation growth to climatic variables present obvious regional differences. Precipitation was the dominant factor affecting the growth of coniferous forests and grasslands in Xinjiang, China [54]. However, grasslands exhibited relatively high positive correlations with precipitation and forest ecosystems, and were primarily limited by temperature in Northeast China [83].…”

Section: Response Of Grassland and Forest To Temperature And Precipitmentioning

confidence: 99%

Contrasting Changes in Vegetation Growth due to Different Climate Forcings over the Last Three Decades in the Selenga-Baikal Basin

Wang

et al. 2019

Remote Sensing

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The Selenga-Baikal Basin, a transboundary river basin between Mongolia and Russia, warmed at nearly twice the global rate and experienced enhanced human activities in recent decades. To understand the vegetation response to climate change, the dynamic spatial-temporal characteristics of the vegetation and the relationships between the vegetation dynamics and climate variability in the Selenga-Baikal Basin were investigated using the Normalized Difference Vegetation Index (NDVI) and gridded temperature and precipitation data for the period of 1982 to 2015. Our results indicated that precipitation played a key role in vegetation growth across regions that presented multiyear mean annual precipitation lower than 350 mm, although its importance became less apparent over regions with precipitation exceeding 350 mm. Because of the overall temperature-limited conditions, temperature had a more substantial impact on vegetation growth than precipitation. Generally, an increasing trend was observed in the growth of forest vegetation, which is heavily dependent on temperature, whereas a decreasing trend was detected for grassland, for which the predominant growth-limiting factor is precipitation. Additionally, human activities, such as urbanization, mining, increased wildfires, illegal logging, and livestock overgrazing are important factors driving vegetation change.

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Growth Hormone Deficiency

Cited by 2 publications

References 2 publications

Driving Factors of Recent Vegetation Changes in Hexi Region, Northwest China Based on a New Classification Framework

Driving Factors of Recent Vegetation Changes in Hexi Region, Northwest China Based on a New Classification Framework

Contrasting Changes in Vegetation Growth due to Different Climate Forcings over the Last Three Decades in the Selenga-Baikal Basin

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