Download presentation
Presentation is loading. Please wait.
Published byWilfred Thomas Modified over 9 years ago
1
Hydrological and Nutrient Controls on the Structure and Function of Southern African Savannas K.K. Caylor, Paolo D’Odorico, Christelle Hély, Greg Okin, S.A. Macko, Natalie Mladenov, Lydia Ries, Susan Ringrose, T.M. Scanlon, H.H. Shugart, R.J. Swap, Matt Therrell, Lixin Wang and Robert Washington-Allen
2
Kalahari Transect Wet and dry season field campaigns for basic ecological process and detailed structural measurements of vegetation
3
Kalahari Transect Wet and dry season field campaigns for basic ecological process and detailed structural measurements of vegetation Detailed soil characterizations
4
Kalahari Transect Wet and dry season field campaigns for basic ecological process and detailed structural measurements of vegetation Detailed soil characterizations Instrumented long-term physical data records
5
Kalahari Transect Wet and dry season field campaigns for basic ecological process and detailed structural measurements of vegetation Detailed soil characterizations Instrumented long-term physical data records Field fertilization experiments with phosphorus and nitrogen and stable isotope analysis in experimental and spatially distributed contexts
6
Strong rainfall gradient, seasonal climate Uniform sandy soils – ‘Kalahari sands’ Heterogeneous vegetation; tree, shrub and grass in woodland, savanna, and shrubland mixtures. High net plant productivity, widespread biomass burning, high carbon turnover IGBP Kalahari Transect
7
Mean annual rainfall along the Kalahari Transect
8
Kalahari Rainfall – 1901- 1996
13
Vegetation Patterns on the Kalahari Transect
14
Plant interactions dominate pattern Landscape interactions dominate pattern Spatial Variation in NDVI at Different Spatial Scales
15
Pattern and Process
16
Vegetation structural characteristics along the Kalahari Transect More Southerly and Drier Decreasing Tree Cover Grass Cover
19
Dispersed Clumped Depends on the Prior History
20
is not equivalent to v necessarily
21
A Landscape Vegetation Model Leaf Patch Multi-Patch Structure
22
UMD Tree Cover Data
23
Live Non-woody Live Tree Leaves Dead Non-woody Dead Tree Leaves
24
Could you tell me again where we’re going with all this?
25
Leaf Patch Multi-Patch Structure Regional Emissions to the Atmosphere or
27
WildfiresIndustrial Domestic Along with wildfires, there are other significant sources of emissions to the atmosphere.
28
WildfiresIndustrial Domestic We have some understanding of the contribution of these different sources.
29
WildfiresIndustrial Domestic Regional Emissions Transport Deposition
30
Live Non-woody Live Tree Leaves Dead Non-woody Dead Tree Leaves
31
Does this have any practical implications?
32
Grazing Pressure across Southern Africa
33
Grazing Impact across Southern Africa during a Wet Year.
34
Grazing Impact across Southern Africa in a Dry Year.
35
In wet versus dry years, the impact varies regionally Wet Dry
39
is not equivalent to v necessarily
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.