Relationships between water availability and Eucalyptus camaldulensis growth in a riparian forest

Bacon, P. E.; Stone, Christine; Binns, Doug L.; Leslie, David J.; Edwards, D. W.

doi:10.1016/0022-1694(93)90125-s

Cited by 56 publications

(47 citation statements)

References 16 publications

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“…In regions with erratic but intense rainfall, characterized by dry and sometimes drought conditions in intervening periods, eucalyptus trees may have a higher probability of surviving ecological disturbances than other tree species (Rocheleau, Weber, and Field-Juma 1988). For example, flooding has a positive impact on mean leaf area, and short term flooding is known to improve tree moisture status and increase growth rates (Bacon et al 1993). When drought occurs, eucalyptus can tap deep-water sources with their roots.…”

Section: Resistance To Destructive Pests Climate Variability and Othmentioning

confidence: 99%

“…However, it is generally not until trees have been established for two to three years that they have developed extensive root systems that will allow them to survive droughts. Bacon et al (1993), suggest that the roots of some eucalypts are known to extend as far down as 10 to 25 metres below ground surface, or 3-4 times the height of the tree, allowing the trees to access water that other plants are unable to utilize.…”

Section: Resistance To Destructive Pests Climate Variability and Othmentioning

confidence: 99%

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The role of trees for sustainable management of less-favored lands: the case of eucalyptus in Ethiopia

Jagger

Pender

2003

Forest Policy and Economics

205

148

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In recent years the planting of eucalyptus trees in Ethiopia has expanded from State owned plantations to community woodlots and household compounds. In an environment suffering from severe woody biomass shortages water scarcity, erosion and land degradation, fast growing and resilient eucalyptus species perform better than most indigenous woodland and forest tree species (as well as most crops). In addition to increasing biomass and providing ground cover, the sale of eucalyptus poles and products has substantial potential to raise farm incomes, reduce poverty, increase food security and diversify smallholder-farming systems in less-favored areas of northern Ethiopia.Despite the potential for eucalyptus to improve rural livelihoods in northern Ethiopia in 1997, the regional government of Tigray imposed a ban on eucalyptus tree planting on farmlands. This ban is related to concerns regarding potential negative environmental externalities associated with eucalyptus and also due to the desire to reserve productive farmland for crop production. The regional government promotes planting of eucalyptus and other species in community woodlots, and has recently begun to allow private planting of eucalyptus on community wasteland and steep hillsides.In this paper, we review the debate about the ecological impacts of eucalyptus trees, as well as the economic factors that influence whether smallholders invest in these trees. Ex ante benefit-cost analysis based on community level survey data from Tigray illustrates that under most conditions planting eucalyptus trees yields high rates of return, well above 20% under most circumstances. The effect of variable harvest rates, the costs of decreased crop production when eucalyptus trees are planted on farmlands, and differences between administrative zones are considered relative to our base case in our rate of return estimates. The importance of fast growing tree species that can accommodate the high discount rates associated with smallholders in this region is emphasized.

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Section: Resistance To Destructive Pests Climate Variability and Othmentioning

confidence: 99%

Section: Resistance To Destructive Pests Climate Variability and Othmentioning

confidence: 99%

The role of trees for sustainable management of less-favored lands: the case of eucalyptus in Ethiopia

Jagger

Pender

2003

Forest Policy and Economics

205

148

View full text Add to dashboard Cite

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“…Grown trees with extensive root systems are considered more competitive than those with less extensive root systems (Marschner, 1995). Although E. camaldulens is is reportedly deep rooting (Jonsson, Fidjeland, Maghembe & Hogberg, 1988;Bacon, Stone, Binns, Leslie & Edwards, 1993), some studies (Stone & Kalisz, 1991) have demonstrated that this species has roots that extend long distances, horizontally from the trunk. Studies by Burgess, Adams, Turner, White & Ong (2001) showed that E. camaldulensis has a dimorphic root system with a single taproot which penetrates to a significant depth, and numerous lateral roots.…”

Section: Resultsmentioning

confidence: 99%

Depletion of nutrients in adjacent crop landsby Eucalyptus camaldulensis

Gindaba

Rozanov

Negash

2007

South African Journal of Plant and Soil

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Fine root distribution of Eucalyptus camaldulensis Dehnh. and effects on soil fertility attributes were studied under field conditions in Badessa, Eastern Ethiopia. Soil samples were collected from inside the stand, edge of the stand and 10 m away from the stand at two depths viz., surface (0-15 cm) and subsurface (30-45 cm) and analysed for fine root biomass and nutrients. Fine root biomasses (root length density (RLD) and root weight density (RWD)) from within the stand and away from the stand were similar. However, RLD and RWD in the surface soils were 50-70% and 28-75% higher than those in the immediate subsurface soils, respectively, at all distances. The organic carbon (C), total nitrogen (N), available phosphorus (P) and exchangeable potassium (K+) contents of surface and subsurface soils inside the stand were 28-60% and 23-32% higher than those away from the stand, respectively. Surface soils had significantly higher organic C, total N, available P and exchangeable K+ than subsurface soils due to deposition of leaf litter. E. camaldulensis improved soil nutrients and organic matter status below the trees due to leaf litter deposition, while areas adjacent to the stand that did not receive litter were depleted of nutrients by the extensive fine roots.

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“…The monitoring potential of remotely sensed data (Anderson et al, 2012) can complement information provided by assessments of flooding requirements of plant species (Bacon et al, 1993;Dexter and Poynter, 2005;Fitzsimons et al, 2011;Peake et al, 2011). This suite of information can provide a more meaningful evaluation of the impacts of changing water availability within riparian systems and evaluate management practices.…”

Section: Discussionmentioning

confidence: 99%

“…Northern Victoria experiences a semi-arid climate, and the forest relies on river flows and topology features that support over-bank flooding throughout the forest, which maintain vegetation growth and activity (Bacon et al, 1993;Chong and Ladson, 2003). Groundwater provides additional localised water sources for vegetation in the Forest, although they are not considered as important as surface water sources (MDBC, 2006).…”

Section: Study Areamentioning

confidence: 99%

Riparian Vegetation Status and Rates of Water Use From Satellite Data

Sheffield

Abuzar

Whitfield³

et al. 2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Hydrology and water availability are key determinants of the health of riparian vegetation systems, and an understanding of the interactions between vegetation and hydrology is a prerequisite for the maintenance and improvement of these systems under managed water regimes. Changes to natural flooding cycles, caused by the regulation of river flows and irrigation activities, have changed the composition and amount of vegetation, and the distribution of species within riparian areas (Chong and Ladson, 2003;Lawrence and Colloff, 2008). The extent and frequency of flooding cycles are key issues for the health of riparian ecosystems under controlled water management regimes. This paper demonstrates the potential contribution of satellite-based measurements to an improved understanding of the changes in vegetation status of riparian systems, and, also, of their water requirement. Evapotranspiration (ET) and Normalised Difference Vegetation Index (NDVI) of the Barmah Forest were derived from satellite imagery over a number of years. NDVI provided a general measure of vegetation status and cover. ET measures provided an indication of the availability of water to the existing vegetation, and an assessment of areas under water-stress (Anderson et al., 2012). Previous work has demonstrated that these indicators provide a comprehensive measure of riparian vegetation status , and estimates of vegetation water requirement (Whitfield et al., 2010a;Sheffield et al., 2011). This paper addresses changes in NDVI and ET rate of major vegetation classes in the Barmah Forest over the period, 1993 -2008. Measures of ET and NDVI, analysed in conjunction with rainfall and river flow data, provided insights into the response of vegetation to changes in water availability, which may be used to evaluate impacts of management practices and water regime within riparian zones.

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Relationships between water availability and Eucalyptus camaldulensis growth in a riparian forest

Cited by 56 publications

References 16 publications

The role of trees for sustainable management of less-favored lands: the case of eucalyptus in Ethiopia

The role of trees for sustainable management of less-favored lands: the case of eucalyptus in Ethiopia

Depletion of nutrients in adjacent crop landsby Eucalyptus camaldulensis

Riparian Vegetation Status and Rates of Water Use From Satellite Data

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