Decadal shifts in grass and woody plant cover are driven by prolonged drying and modified by topo-edaphic properties

2016 ◽  
Vol 26 (8) ◽  
pp. 2480-2494 ◽  
Author(s):  
Seth M. Munson ◽  
Temuulen T. Sankey ◽  
George Xian ◽  
Miguel L. Villarreal ◽  
Collin G. Homer
Keyword(s):  
Woody Plant ◽  
Plant Cover ◽  
Edaphic Properties

scholarly journals Post-fire management and recovery of a pine forest in Greece

Web Ecology ◽  
2010 ◽  
Vol 10 (1) ◽  
pp. 27-31 ◽  
Author(s):  
I. Spanos ◽  
Y. Raftoyannis ◽  
P. Platis ◽  
E. Xanthopoulou
Keyword(s):  
Woody Plant ◽  
Pinus Halepensis ◽  
Plant Cover ◽  
Woody Species ◽  
Control Site ◽  
Plant Composition ◽  
Northern Greece ◽  
Pine Regeneration ◽  
Negative Effect ◽  
Treatment Application

Abstract. The effects of management after fire in Pinus halepensis forests were assessed in northern Greece. Seeding, logging and building of log barriers were applied in burned sites and compared to a control site. Two years after treatment application, 70–80% of the ground in all sites was covered with vegetation. Seeding with herbaceous plants did not increase plant cover. Logging and building of log barriers negatively affected herbaceous species but increased woody species. During the first spring after fire, the highest numbers of P. halepensis seedlings were observed in the control site and the lowest number in the logged site. Logging and log barrier building had a negative effect on pine regeneration compared to control and seeding treatments. Woody plant composition was similar in control and seeding sites, with dominance of P. halepensis and Cistus species. A different pattern was observed in the logging and log-barrier sites with a low number of seeders and a high number of resprouter species.

scholarly journals Effects of Land-Use Practices on Woody Plant Cover Dynamics in Sahelian Agrosystems in Burkina Faso since the 1970s–1980s Droughts

2019 ◽  
Vol 11 (21) ◽  
pp. 5908 ◽  
Author(s):  
Wendpouiré Arnaud Zida ◽  
Babou André Bationo ◽  
Jean-Philippe Waaub
Keyword(s):  
Land Use ◽  
Burkina Faso ◽  
Vegetation Index ◽  
Woody Plant ◽  
Strong Dependence ◽  
Plant Cover ◽  
Social Adaptation ◽  
Landsat Images ◽  
Land Use Practices ◽  
Agroforestry Practices

The 1970s–1980s droughts in the Sahel caused a significant degradation of land and plant cover. To cope with this situation, populations have developed several biophysical and social adaptation practices. Many of these are agroforestry practices and contribute to the maintenance of agrosystems. Unfortunately, they remain insufficiently documented and their contributions to the resilience of agrosystems insufficiently evaluated. Many authors widely link the regreening in the Sahel after droughts to the resumption of rainfall. This study examines the contribution of agroforestry practices to the improvement of woody plant cover in the North of Burkina Faso after the 1970s–1980s droughts. The examination of practices is carried out by integrating the rainfall, soil, and geomorphology variables. Landsat images are used to detect changes in woody plant cover: increasing, decreasing, and no-change in the Enhanced Vegetation Index. In addition, 230 field observations, coupled with interviews conducted on the different categories of change, have allowed to characterize the biophysical environment and identify land-use practices. The results show a variability of vegetation index explained to 9% (R2 = 0.09) by rainfall. However, Chi-Squared independence tests show a strong dependence between changes in woody plant cover and geomorphology (p = 0.0018 *), land use, land cover (p = 0.0001 *), and land-use practices (p = 0.0001 *). Our results show that rainfall alone is not enough to explain the dynamics of agrosystems’ woody plant cover. Agricultural and social practices related to the dynamics of farmer perceptions play a key role.

Sensitivity of regional evapotranspiration partitioning to variation in woody plant cover: insights from experimental dryland tree mosaics

2015 ◽  
Vol 24 (9) ◽  
pp. 1040-1048 ◽  
Author(s):  
Juan Camilo Villegas ◽  
Francina Dominguez ◽  
Greg A. Barron-Gafford ◽  
Henry D. Adams ◽  
Maite Guardiola-Claramonte ◽  
...  
Keyword(s):  
Woody Plant ◽  
Plant Cover ◽  
Regional Evapotranspiration ◽  
Evapotranspiration Partitioning

scholarly journals Mapping woody plant cover in desert grasslands using canopy reflectance modeling and MISR data

2006 ◽  
Vol 33 (17) ◽  
Author(s):  
Mark J. Chopping ◽  
Lihong Su ◽  
Andrea Laliberte ◽  
Albert Rango ◽  
Debra P. C. Peters ◽  
...  
Keyword(s):  
Woody Plant ◽  
Plant Cover ◽  
Canopy Reflectance ◽  
Reflectance Modeling

Springs on rangelands: runoff dynamics and influence of woody plant cover

2006 ◽  
Vol 20 (15) ◽  
pp. 3277-3288 ◽  
Author(s):  
Yun Huang ◽  
Bradford P. Wilcox ◽  
Libby Stern ◽  
Humberto Perotto-Baldivieso
Keyword(s):  
Woody Plant ◽  
Plant Cover ◽  
Runoff Dynamics

Do Woody Plants Prevent the Establishment of Common Reed along Highways? Insights from Southern Quebec

2013 ◽  
Vol 6 (4) ◽  
pp. 585-592 ◽  
Author(s):  
Arnaud Albert ◽  
Jacques Brisson ◽  
Jean Dubé ◽  
Claude Lavoie
Keyword(s):  
Woody Plants ◽  
Vascular Plants ◽  
Woody Plant ◽  
Plant Cover ◽  
Common Reed ◽  
Soil Disturbance ◽  
Drainage Ditch ◽  
Invasive Grasses ◽  
Competition For Light ◽  
The Common

AbstractThe common reed (Phragmites australis) is one of the most invasive vascular plants in northeastern North America. A competitive genotype from Eurasia has recently invaded road and agricultural ditches, which facilitate the dispersal of the plant over long distances. However, large tracts of roadsides—apparently propitious for the establishment of the plant—are not invaded by the grass. We hypothesized that the absence of the invader is associated with physical and biological characteristics of roadsides. To test this hypothesis, we collected field data and developed two statistical models to explain the presence or absence of the common reed along a highway of southern Quebec highly invaded by the plant but with contrasting patterns of common reed distribution. The models explained 23 to 30% of the total variance and correctly predicted the presence or absence of common reed 71% of the time. The models suggest that a dense woody plant cover over a drainage ditch limits the establishment and/or expansion of the common reed, probably by competition for light and space. Also, shaded ditches are not subjected to a frequent maintenance, and are therefore less disturbed, probably further reducing common reed invasion because the germination of their seeds is less likely without soil disturbance. This study yields insights on the potential of woody plants for controlling the expansion of invasive grasses, and could help to justify the preservation of dense shrubs and tree hedges along right-of-ways.

scholarly journals KATEGORI KONSERVASI VEGETASI TUMBUHAN BAWAH DI LAHAN BERA WOMNOWI DISTRIK SIDEY MANOKWARI PAPUA BARAT

2020 ◽  
Vol 2 (1) ◽  
pp. 1-10
Author(s):  
Slamet Arif Susanto ◽  
Heru Joko Budirianto ◽  
Agatha Cecilia Maturbongs
Keyword(s):  
Woody Plant ◽  
Plant Cover ◽  
Sampling Technique ◽  
Primary Forest ◽  
Fallow Land ◽  
Fallow Lands ◽  
Data Deficient ◽  
Papua Barat ◽  
Status Data ◽  
Important Value Index

Trees vegetation are obviously dominate at the old fallow lands of Papua Indonesian. Fallow lands in the edge of primary forest is generally at Sidey District Manokwari. The purpose of this study is to determinate understory cover vegetation conservation based list of IUCN at the fallow land Womnowi Sidey Manokwari. An inventory of vegetation has done using analysis of vegetation―continuous line sampling technique, 2 x 2 meters for sampling seedlings and understory non-woody plant cover and 5 x 5 for saplings. At one hectare fallow land we found 1482 an individual of 122 species understory cover, only 158 an individual of 22 species had entered in IUCN redlist. Species with status least concern (LC) are dominate (>80%) compare with status data deficient (DD), near threatened (NT), and vulnerable (V). The important value index (IVI) of species on list IUCN showing 22.60% at seedlings and non-woody understory cover and 19.81% at the saplings phase. Aglaia odorata Lour.(seedling and sapling) is LC category, Intsia bijuga (Colebr.) Kuntze (seedling) V category, and Pandanus tectorius var., uapensis (non-woody plant) DD category, each species is the only one. The further study should be more intensive compare primary forest and old fallow lands of Papua―the conservation list of understory cover vegetation is lowest, so we conclude this is obviously understory vegetation at old fallow lands.Key word: fallow land, conservation, Sidey, understory, analysis of vegetation

scholarly journals Dynamics of woody plant cover in the Sahelian agroecosystems of the northern region of Burkina Faso since the 1970s–1980s droughts

2020 ◽  
Vol 50 (7) ◽  
pp. 659-669
Author(s):  
Wendpouiré Arnaud Zida ◽  
Farid Traoré ◽  
Babou André Bationo ◽  
Jean-Philippe Waaub
Keyword(s):  
Burkina Faso ◽  
Woody Plants ◽  
Vegetation Index ◽  
Woody Plant ◽  
Plant Cover ◽  
Northern Region ◽  
Climatic Conditions ◽  
Landsat Images ◽  
Sahel Region ◽  
Effective Conservation

This study was carried out in the northern region of Burkina Faso under Sahelian climatic conditions. The area was particularly affected by the 1970s–1980s droughts that led to the degradation of land and vegetation. Since the early 1990s, a gradual return of rainfall has been observed throughout the Sahel region. In this new environmental context, understanding the development of woody plants is important for effective conservation and management. We analyzed the dynamics of woody plant cover over the 30 years following the end of the 1970s–1980s droughts by using Landsat images from 1986, 1999, and 2015 with 30 m spatial resolution and taking into account changes in rainfall and land use. The change in the enhanced vegetation index 1 (EVI1) at the beginning of the dry season was used as a proxy for the change in photosynthetic activity of woody plants. Results showed an improvement in EVI1 on 98% of the study area, with a mean increase of 0.20 from 1986 to 2015. This improvement was accompanied by an increase in agroforestry and was weakly correlated with rainfall. The improvement in EVI1 was unstable, however, with a decline from 1999 to 2015 in the areas undergoing regreening.

Grassland fragmentation and its influence on woody plant cover in the southern Great Plains, USA

2018 ◽  
Vol 33 (10) ◽  
pp. 1785-1797 ◽  
Author(s):  
R. Scholtz ◽  
J. A. Polo ◽  
E. P. Tanner ◽  
S. D. Fuhlendorf
Keyword(s):  
Great Plains ◽  
Woody Plant ◽  
Plant Cover ◽  
Southern Great Plains

scholarly journals Woody Plant Cover Estimation in Texas Savanna from MODIS Products

2019 ◽  
Vol 23 (7) ◽  
pp. 1-14 ◽  
Author(s):  
Xuebin Yang
Keyword(s):  
Time Series ◽  
Woody Plants ◽  
Woody Plant ◽  
Plant Density ◽  
Plant Cover ◽  
Regional Scale ◽  
Multiple Linear Regression Model ◽  
Absolute Error ◽  
Vertical Projection ◽  
And Function

Abstract Woody plant cover, the area of the vertical projection of woody plants (trees, shrubs, and bushes), plays an important role in the structure and function of savanna ecosystems and is needed by the savanna modeling community. Recent problems facing savanna ecosystems such as woody plant encroachment and subsequent habitat fragmentation further underscore the relevance of regional-scale and even larger-scale woody plant cover mapping. The mixture of woody plants and herbaceous vegetation in savanna landscapes lends woody plant cover mapping to fractional representation. This study endeavors to develop a simple and reliable approach for fractional woody plant cover mapping in savanna ecosystems. It was tested in the savanna of central Texas, which features a wide woody plant density gradation. A multiple linear regression model was calibrated between orthophoto-based fractional woody plant cover and metrics derived from time series MODIS products of surface reflectance (MOD09A1) and fraction of photosynthetically active radiation (MOD15A2H). By applying this model, woody plant cover was extrapolated to Texas savanna at MODIS scale (500 m). Validation suggests a mean absolute error of 0.098 and an R-squared value of 0.60. This study demonstrates a potential approach for woody plant cover mapping in other savanna ecosystems of the world. It also highlights the utility of time series MODIS products in savanna woody plant cover estimation.

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