Patterns and Determinants of Historical Woodland Clearing in Central‐Western New South Wales,Australia

We consider the history of woodland clearing in central western New South Wales, Australia, which has led to the present highly cleared and fragmented landscape. A combined approach is used examining available historical land‐use data and using regression analysis to relate the pattern of cleared and wooded areas in the recent landscape to environmental variables, taking into account the contagious nature of clearing. We also ask whether it would be possible to apply a simple simulation modelling approach to reconstruct a credible historical sequence of clearing in the study area. The historical data indicate that annual clearing rates have varied substantially in the study area and selective tree removal (ringbarking and thinning) has been common. These findings make it unlikely that a simple simulation approach would replicate the spatial and temporal sequence of woodland loss. Our regression results show that clearing patterns can be related to environmental variables, particularly annual rainfall and estimated pre‐European vegetation type, but that patterns are dominated by contagion.     

Prospects for,and Challenges of,Research Design and Training in Cross‐Disciplinary Environmental Management Research

Research in coupled human and natural systems can be quite a cross‐disciplinary endeavour, requiring the combination of diverse concepts, methods, and approaches. While there is a wide recognition of the importance of incorporating different viewpoints, perspectives, and disciplines in achieving positive environmental and social outcomes, the methods through which such research is designed, specifically the processes engaged in, are largely absent from the literature. This presents challenges in research training for students in the field. This paper uses the example of a recent student project examining the management of Temperate Highland Peat Swamps on Sandstone to consider how research training might address project design, conceptual challenges, and methodological choices. The goal of this project was to build improved understanding of the role of context in the adaptive management of these endangered ecological communities from Commonwealth to micro‐local scales. The paper explores the complexities of integrating approaches and methods drawn from both social sciences and environmental sciences. Rather than providing a definitive ‘how to guide’ for conducting integrative cross‐disciplinary research, it offers food for thought on the processes involved in creating a research project which transcends boundaries between social science and environmental science that are easily entrenched in research training that is compartmentalised along discipline lines.     

NDVI variation and its relation to climate in Canadian ecozones

Parks Canada began the Northern Satellite Monitoring Program in 1997, with the objective of tracking large‐scale vegetation variation in Canadian ecosystems and helping land managers to develop appropriate management practices in response to climate change. Under this program, a sequence of 10‐day composite Advanced Very High Resolution Radiometer (AVHRR)‐derived Normalized Difference Vegetation Index (NDVI) data from 1985 to 2007 was examined to study seasonal and inter‐annual relationships between vegetation and climate data over Canadian ecosystems using statistical and wavelet analysis. Statistical analysis showed that temperature was the principal driver for seasonal variability in greenness, explaining more than 70 percent of seasonal variation in vegetation for most Canadian ecozones. In comparison with temperature, the relationships between NDVI and precipitation were weaker but still significant. Maximum annual NDVI showed increasing trends in Canadian ecozones during the study period, although increasing rates were spatially heterogeneous. Wavelet analysis confirmed that inter‐annual variation in NDVI was different at two ecozones in Canada. NDVI variation in the Northern Arctic was significant at scales of 3–4 years from 1997 to 2001, which was associated with temperature and precipitation variation. Comparatively, NDVI variation in the Boreal Shield was significant at scales of 5–8 years from 1991 to 1999, but did not correspond with climate variation.     

Water,Wind, Wood,and Trees: Interactions,Spatial Variations,Temporal Dynamics,and their Potential Role in River Rehabilitation

Recent Australian research has quantified the role of large wood (wood of any origin and length with a diameter greater than 0.1 m) in dissipating stream energy, forming pool habitats by local bed scour, protecting river banks from erosion, and damming rivers with long rafts causing avulsions. Large wood in Australian streams is sourced by a range of processes from the nearby riparian zone which has usually been degraded by post‐European settlement vegetation clearing. Large wood loadings within the bankfull channel are dependent not only on the type and quality of the riparian plant community but also on bankfull specific stream power, channel width, and the processes of large wood delivery to the stream. While bank erosion and floodplain stripping by catastrophic floods are obvious and important delivery mechanisms, treefall and trunk and branch breakage by strong winds during tropical cyclones and severe storms are also significant in the tropics. Furthermore, wood decay and downstream transport produce temporally dynamic large wood distributions. The longevity of natural large wood structures in rivers, such as rafts, debris dams, and log steps, requires determination. River rehabilitation programs need to not only include the reintroduction of large wood, but also carefully plan the spatial distribution of that wood, the most appropriate type and range of large wood structures, and, most importantly, the revegetation of the riparian zone to ensure a natural long‐term source of large wood. Exotic species management is an essential part of river rehabilitation.     

Managing,Valuing, and Protecting Heritage Resources in the Twenty-First Century: Peatland Archaeology,the Ecosystem Services Framework,and the Kyoto Protocol

Abstract

This paper argues that the development of the Ecosystem Services framework, which has recently emerged as an internationally recognized framework for valuing ‘the ‘natural capital’ of ecosystems, presents a number of opportunities for heritage management and the archaeological record, arguing that the inclusion of archaeological and palaeoenvironmental ‘value’ within this framework presents an opportunity to incorporate heritage alongside a range of other critical ‘services’. It presents a short case study focusing on the problems facing the preservation of peatland archaeological sites and deposits in situ alongside developments within peatland conservation and restoration initiatives partly driven by the ability of healthy, functioning peatlands to sequester carbon and hence mitigate climate change. It is argued that this drive towards peatland re-wetting may bring both positive benefits and opportunities for heritage management but also presents a number of practical issues, which now require active engagement from the archaeological community.     

Gardening the Wild: Change in the Flora and Vegetation of a Suburban Coastal Reserve 1911–2013

Intensively used and managed remnants of native vegetation in cities can have characteristics that result as much from ecological gardening as processes independent of humans. We test the degree to which the changes in vegetation of the Bayside Reserve, Melbourne, are consistent with the outcome we would expect from an ecologically gardened nature and to what degree they reflect ongoing processes of exotic invasion and synthetic vegetation dynamics. We compared species lists from 1911, 1971 and 2013 and sample area data from 1971 and 2013. The flora became richer and more exotic, although some native plant species lost in 1971 had been reintroduced to the reserve in 2013. Between 1971 and 2013, the vegetation increased in cover, shrub and tree density, sample areas species richness, and nativeness, the latter two results being inconsistent with the usual patterns of increasing exoticness and decline in species richness with shrub and tree encroachment. These variations from normality were likely to have resulted from the impacts of planting of natives and weeding of exotics, activity that has created combinations of species that probably never occurred in pre‐European vegetation. Although it might not be possible to return to pre‐European ecosystems within this vegetation remnant, the gardened approximation helps some locally uncommon species survive and may make people more sympathetic to nature conservation as a whole.     

Reconstruction of the Late Glacial and Early Holocene landscape and human presence in Lubrza,Western Poland,on the basis of multidisciplinary analyses

This paper presents the results of a multidisciplinary study that combines archaeological and palaeoenvironmental research to examine the relationship between environment and human activities in Western Poland during the Late Glacial and Early Holocene. The study area lying within the young moraine landscape produced several Late Palaeolithic and Early Mesolithic sites, varied in terms of size and function. Analyses of pollen, plant macro-remains and molluscs accompanied by geomorphological investigations and supported by series of radiocarbon dates have enabled a detailed reconstruction of environment. It has shown that despite climatic fluctuations during the Allerød and Younger Dryas, the studied area provided favourable conditions for hunter-gatherer occupation. The presence of micro- and macroscopic charcoal, charred particles of herbaceous plants and charred mosses in peat deposits of former water bodies evidence various activities carried out by Federmesser and Swiderian groups, for example setting up camp-fires and deliberate burning of the local marsh vegetation. Usewear analyses of flint implements have revealed further traces of diversified human activities undertaken at examined sites. Most importantly, this article focuses on plant-based craft activities undertaken by hunter-gatherers, about which little has hitherto been known.     

Assessment of Riparian Rainforest Vegetation Change in Tropical North Queensland for Management and Restoration Purposes

Changes in riparian vegetation extent in northern Queensland, Australia were assessed using aerial photographs from 1944 and 2000. Change in riparian extent was recorded as vegetation gain or loss. Changes in density were recorded as vegetation thickening. Riparian forest coverage increased by 22 ha during this time period in the Mossman River catchment. A total of 124 ha of riparian forest were gained, while 101 ha of riparian forest were lost. A further 59 ha of forest increased in density over this time period. Clearing, changes in farm management practices and natural stream channel movement have been identified as three potential causes for these changes. Areas with little or no riparian vegetation were identified and categorised into priority levels for potential revegetation efforts.     

Vegetation,land, and wood use at the sites of Bat and Al‐Khashbah in Oman (fourth–third millennium BC)

About 4200 charcoal fragments have been identified from the fourth‐ to third‐millennium BC archaeological sites of Bat and Al‐Khashbah in order to gain an understanding of plant resources available at the sites. Acacia sp., Ziziphus sp., and Tamarix sp. were the main taxa identified at both sites and indicate a similar vegetation composition as today. Phoenix sp. (date palm) charcoal also has been found at both sites. Whereas the cultivation of date palm for the 2700–2300 BC layers from Bat was likely, given other circumstantial evidence (i.e. local cereal cultivation and floodwater irrigation), it is unclear whether date palm was cultivated at Al‐Khashbah. Especially for the older periods (3300–2700 BC) it is possible that nomadic pastoralists were exploiting and/or managing wild date palms. The find of Avicennia marina at Al‐Khashbah indicates long‐distance contacts with the coast.     

Soil and organic carbon losses from varying land uses: a global meta‐analysis

Soil (SL) and organic carbon losses (SOC_L) have increased with human population and climate change linked extreme events. While SL and SOC_L are clearly associated with surface run‐off, the impact of land use is still not well understood. This article elucidates the effects of land use, surface cover, and other environmental factors on SL and SOC_L using data from 55 published studies. The overall SL (12.34 ± 2.25 Mg ha^?1 year^?1) and SOC_L (21.80 ± 0.91 g C m^?2 year^?1) suggests substantial losses of the fertile topsoil globally. Grasslands (4.19 ± 1.22 Mg ha^?1 year^?1) had 77%, 66%, and 41% lower SL than orchards, croplands, and forests, respectively, which is attributable to higher soil organic matter and surface cover. Croplands had the highest SOC_L at 22.78 ± 2.22 g C m^?2 year^?1. Natural vegetation had 98% and 70% lower run‐off and SL than did plant residue mulched plots, indicating its great potential for surface run‐off and soil erosion control. Rainfall and slope were key drivers of soil erosion, while soil surface cover, SOC, and clay content decreased. These findings improve our knowledge on soil and organic carbon losses, which is useful for fostering sustainable management of soils and natural vegetation to enhance ecosystems functionality.