scholarly journals Impact of wild herbivores grazing on herbaceous vegetation and shrubs at the silvers fir forest of the Riserve Naturali Casentinesi: removal of biomass, alteration of vegetation dynamics, simplification of flora and impact on forest regeneration

2015 ◽  
Author(s):  
Vincenzo Gonnelli
Keyword(s):  
Vegetation Dynamics ◽  
Forest Regeneration ◽  
Herbaceous Vegetation

Use of syntaxonomy to study the anthropogenic vegetation dynamics

2012 ◽  
pp. 135-143
Author(s):  
B. M. Mirkin ◽  
S. M. Yamalov ◽  
A. V. Bayanov ◽  
N. M. Sayfullina
Keyword(s):  
Plant Communities ◽  
Vegetation Dynamics ◽  
Ecological Monitoring ◽  
Southern Urals ◽  
The Southern Urals ◽  
Herbaceous Vegetation ◽  
Spectra Analysis ◽  
Pasture Digression ◽  
Anthropogenic Vegetation ◽  
Effective Instrument

Method of studying of herbaceous vegetation succession with the usage of vegetation syntaxonomy is described. A prospect of the method is shown by given examples of analysis of pasture digression, recreation succession of meadow communities and succession under the influence of reestablishing successions on the place of ghost villages in the Southern Urals. Possibility of application of the results of phytosociological spectra analysis for evaluation of succession status of plant communities is discussed. The analysis of phytosociological spectra might be an effective instrument for ecological monitoring of vegetation.

scholarly journals Native forest regeneration and vegetation dynamics in non-native Pinus patula tree plantations in Madagascar

2019 ◽  
Vol 446 ◽  
pp. 20-28
Author(s):  
Herizo Randriambanona ◽  
Josoa R. Randriamalala ◽  
Stéphanie M. Carrière
Keyword(s):  
Vegetation Dynamics ◽  
Forest Regeneration ◽  
Tree Plantations ◽  
Pinus Patula ◽  
Native Forest

scholarly journals Global changes in dryland vegetation dynamics (1988–2008) assessed by satellite remote sensing: comparing a new passive microwave vegetation density record with reflective greenness data

2013 ◽  
Vol 10 (10) ◽  
pp. 6657-6676 ◽  
Author(s):  
N. Andela ◽  
Y. Y. Liu ◽  
A. I. J. M. van Dijk ◽  
R. A. M. de Jeu ◽  
T. R. McVicar
Keyword(s):  
Land Surface ◽  
Vegetation Dynamics ◽  
Vegetation Index ◽  
Fire Regime ◽  
Linear Regression Analysis ◽  
Passive Microwave ◽  
Woody Encroachment ◽  
Woody Vegetation ◽  
Global Changes ◽  
Herbaceous Vegetation

Abstract. Drylands, covering nearly 30% of the global land surface, are characterized by high climate variability and sensitivity to land management. Here, two satellite-observed vegetation products were used to study the long-term (1988–2008) vegetation changes of global drylands: the widely used reflective-based Normalized Difference Vegetation Index (NDVI) and the recently developed passive-microwave-based Vegetation Optical Depth (VOD). The NDVI is sensitive to the chlorophyll concentrations in the canopy and the canopy cover fraction, while the VOD is sensitive to vegetation water content of both leafy and woody components. Therefore it can be expected that using both products helps to better characterize vegetation dynamics, particularly over regions with mixed herbaceous and woody vegetation. Linear regression analysis was performed between antecedent precipitation and observed NDVI and VOD independently to distinguish the contribution of climatic and non-climatic drivers in vegetation variations. Where possible, the contributions of fire, grazing, agriculture and CO2 level to vegetation trends were assessed. The results suggest that NDVI is more sensitive to fluctuations in herbaceous vegetation, which primarily uses shallow soil water, whereas VOD is more sensitive to woody vegetation, which additionally can exploit deeper water stores. Globally, evidence is found for woody encroachment over drylands. In the arid drylands, woody encroachment appears to be at the expense of herbaceous vegetation and a global driver is interpreted. Trends in semi-arid drylands vary widely between regions, suggesting that local rather than global drivers caused most of the vegetation response. In savannas, besides precipitation, fire regime plays an important role in shaping trends. Our results demonstrate that NDVI and VOD provide complementary information and allow new insights into dryland vegetation dynamics.

scholarly journals Guidelines for modeling natural regeneration in boreal forests

2009 ◽  
Vol 85 (3) ◽  
pp. 427-439 ◽  
Author(s):  
Juan A Blanco ◽  
Clive Welham ◽  
J.P. (Hamish) Kimmins ◽  
Brad Seely ◽  
Daniel Mailly
Keyword(s):  
Vegetation Dynamics ◽  
Natural Regeneration ◽  
Boreal Forests ◽  
Forest Regeneration ◽  
Field Studies ◽  
Natural Systems ◽  
Recent Interest ◽  
Key Words Climate Change ◽  
Complex Models ◽  
Landscape Level

Natural regeneration is recognized as an important component of forest management. Field studies are usually combined with conceptual and mathematical models as the most effective way to understand and predict natural regeneration. In the case of the boreal forest, several important issues arise in the design of regeneration models and are reviewed here. The most important concerns the trade-off between complexity and portability. Complex models may mimic natural systems more closely than do simpler models, but this realism comes at a cost in terms of the volume of data necessary for their calibration. A second issue is that most regeneration models have been scaled to problems at the tree and stand level, but recent interest in landscape-level issues requires models applicable to this higher spatial scale. Finally, the conceptual framework underlying most regeneration models may need to be revisited in light of recent efforts to depict vegetation dynamics under changing climatic regimes. It is unlikely that any single modeling approach will prove adequate for modeling natural regeneration under all conditions, and we provided guidelines as to how to create effective regeneration models. Key words: climate change, disturbance, ecological models, forest regeneration, seedlings

scholarly journals Global changes in dryland vegetation dynamics (1988–2008) assessed by satellite remote sensing: combining a new passive microwave vegetation density record with reflective greenness data

2013 ◽  
Vol 10 (5) ◽  
pp. 8749-8797 ◽  
Author(s):  
N. Andela ◽  
Y. Y. Liu ◽  
A. I. J. M. van Dijk ◽  
R. A. M. de Jeu ◽  
T. R. McVicar
Keyword(s):  
Land Surface ◽  
Vegetation Dynamics ◽  
Vegetation Index ◽  
Fire Regime ◽  
Linear Regression Analysis ◽  
Passive Microwave ◽  
Woody Encroachment ◽  
Woody Vegetation ◽  
Global Changes ◽  
Herbaceous Vegetation

Abstract. Drylands, covering nearly 30% of the global land surface, are characterized by high climate variability and sensitivity to land management. Here, two satellite observed vegetation products were used to study the long-term (1988–2008) vegetation changes of global drylands: the widely used reflective-based Normalized Difference Vegetation Index (NDVI) and the recently developed passive-microwave-based Vegetation Optical Depth (VOD). The NDVI is sensitive to the chlorophyll concentrations in the canopy and the canopy cover fraction, while the VOD is sensitive to vegetation water content of both leafy and woody components. Therefore it can be expected that using both products helps to better characterize vegetation dynamics, particularly over regions with mixed herbaceous and woody vegetation. Linear regression analysis was performed between antecedent precipitation and observed NDVI and VOD independently to distinguish the contribution of climatic and non-climatic drivers in vegetation variations. Where possible, the contributions of fire, grazing, agriculture and CO2 level to vegetation trends were assessed. The results suggest that NDVI is more sensitive to fluctuations in herbaceous vegetation, which primarily use shallow soil water whereas VOD is more sensitive to woody vegetation, which additionally can exploit deeper water stores. Globally, evidence is found for woody encroachment over drylands. In the arid drylands, woody encroachment seems to be at the expense of herbaceous vegetation and a global driver is interpreted. Trends in semi-arid drylands vary widely between regions, suggesting that local rather than global drivers caused most of the vegetation response. In savannas, besides precipitation, fire regime plays an important role in shaping trends. Our results demonstrate that NDVI and VOD provide complementary information, bringing new insights on vegetation dynamics.

Vegetation Dynamics

2016 ◽  
Author(s):  
Derek Eamus ◽  
Alfredo Huete ◽  
Qiang Yu
Keyword(s):  
Vegetation Dynamics

Data from "Wildfire severity and postfire salvage harvest effects on long-term forest regeneration"

2020 ◽  
Author(s):  
Nick A. Povak ◽  
Derek J. Churchill ◽  
C. Alina Cansler ◽  
Paul F. Hessburg ◽  
Van R. Kane ◽  
...  
Keyword(s):  
Forest Regeneration

La valorisation des prestations non-bois: particularités genevoises (essai) | Commercialization of non-wood forest services: the case of Geneva (essay)

2009 ◽  
Vol 160 (8) ◽  
pp. 232-234
Author(s):  
Patrik Fouvy
Keyword(s):  
Forest Regeneration ◽  
Biological Diversity ◽  
The State ◽  
Forest Land ◽  
Private Forests ◽  
The Public ◽  
Public Body ◽  
Provision Of Services ◽  
History Of ◽  
Near Future

The history of the forests in canton Geneva, having led to these being disconnected from productive functions, provides a symptomatic demonstration that the services provided by the forest eco-system are common goods. Having no hope of financial returns in the near future and faced with increasing social demands, the state has invested in the purchase of forest land, financed projects for forest regeneration and improvement of biological diversity and developed infrastructures for visitors. In doing this the state as a public body takes on the provision of services in the public interest. But the further funding for this and for expenses for the private forests, which must be taken into account, are not secured for the future.

Stufige Mischwälder im Unter-Thurgau | Stratified Mixed Forests in the Lower Thurgau

1999 ◽  
Vol 150 (7) ◽  
pp. 249-251
Author(s):  
Heinz Kuhn
Keyword(s):  
20Th Century ◽  
Forest Regeneration ◽  
Central Plateau ◽  
Intervention Intensity ◽  
Continuous Forest ◽  
Federal Institute ◽  
As Species ◽  
Landscape Research ◽  
Selection Forest ◽  
Structure Diversity

As in many parts of the Swiss Central Plateau, vast coppices with standards have grown in the region of Diessenhofen for centuries. While in other parts of the first decades of the 20th century the forests were converted to areas of forest regeneration species, the foresters of the Diessenhofen region altered numerous pillaged coppices with standards to a stratified continuous forest. The advantages of this form of management such as species and structure diversity and lower costs in comparison with the forest stratified by age are being presented. Each of the four foresters in the region has formed different stand images through his personal intervention intensity. There are different ways possible for achieving a continuous forest, in order to prove this, differences of managing a selection forest system are carried out by the four regional foresters. After decades of experience in tending stands established out of former coppices with standards, the approach of converting plenter forests from existing forests stratified by age to stratified continuous forests is experienced. The successes also encouraged the foresters of the neighbouring district Steckborn to do the same. This creative task is being accompanied scientifically by the WSL (Federal Institute of Forest, Snow and Landscape Research, Birmensdorf, Switzerland), which has established permanent observation areas. The steps in the previously intuitive procedure can, therefore, now be traced.

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