نتایج جستجو برای: vegetation dynamics

تعداد نتایج: 482770  

Journal: :Remote Sensing 2015
Linlin Lu Claudia Kuenzer Cuizhen Wang Huadong Guo Qingting Li

Understanding the spatial and temporal dynamics of vegetation is essential in drylands. In this paper, we evaluated three vegetation indices, namely the Normalized Difference Vegetation Index (NDVI), the Soil-Adjusted Vegetation Index (SAVI) and the Enhanced Vegetation Index (EVI), derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) Surface-Reflectance Product in the Xinjiang...

2009
M. Wegehenkel

Vegetation affects water balance of the land surface by e.g. storage of precipitation water in the canopy and soil water extraction by transpiration. Therefore, it is essential to consider the role of vegetation in affecting water balance by taking into account the temporal dynamics of e.g. leaf area index, rooting depth and stomatal conductance in hydrological models. However until now, most c...

2005
S. M. Herrmann A. Anyamba C. J. Tucker

This research investigates temporal and spatial patterns of vegetation greenness and explores relationships between rainfall and vegetation dynamics in the Sahel, based on analyses of NDVI time series and gridded precipitation estimates at different spatial resolutions.

2011
Gabriela Woźniak Damian Chmura Agnieszka Błońska Barbara Tokarska-Guzik Edyta Sierka

The immense variety in plant diversity at the species level might explain why it is so difficult to establish strict generalizations in vegetation dynamics. In the last two decades many published research reports have shown that the introduction of the concept of plant functional groups (PEG) into the analysis of vegetation dynamics might be more informative in explaining spatiotemporal changes...

Journal: :Remote Sensing 2015
Xianfeng Liu Xiufang Zhu Shuangshuang Li Yanxu Liu Yaozhong Pan

In recent decades, the monitoring of vegetation dynamics has become crucial because of its important role in terrestrial ecosystems. In this study, a satellite-derived normalized difference vegetation index (NDVI) was combined with climate factors to explore the spatiotemporal patterns of vegetation change during the growing season, as well as their driving forces in China from 2001 to 2012. Ou...

2004
S. Brand

Vegetation change detection has become increasingly important in understanding vegetation dynamics and its role in terrestrial and atmospheric systems. In the case of Scotland, there is a need to routinely monitor habitats which include native pine woodland, montane habitats, upland heathland and blanket bog (EC Habitats Directive). In northern temperate regions restricted and distinct growing ...

Journal: :Journal of theoretical biology 2009
A Y Kletter J von Hardenberg E Meron A Provenzale

We study a mathematical model for the dynamics of patterned dryland vegetation in the presence of rainfall intermittency, adopting a spatially explicit approach. We find that most results found for constant precipitation carry over to the case of intermittent rainfall, with a few important novelties. For intermittent precipitation, the functional forms of the water uptake and consequently of th...

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