Multiple Ecological Drivers Determining Vegetation Attributes across Scales in a Mountainous Dry Valley, Southwest China

Identifying the ecological processes determining spatial variation in community composition and structure is a central issue in arid areas, especially in the face of climate change. This study aims to estimate how environmental and spatial processes jointly determine vegetation attributes across scales in the Min dry valley, one of the dry valleys in Hengduan Mountainous region suffering severe ecological degradation. A total of 48 plots along slope transects were investigated at three sites along the dry valley, with vegetation and environmental information gathered. Distance-based Moran’s eigenvector maps (dbMEM) was used to extract local spatial variables, while geographic coordinates were used as regional spatial variables. We used redundancy analysis (RDA) and variation partitioning to detect the relative importance of environmental and spatial processes in influencing community composition and vegetation structure (including biomass, coverage, height, density, α and β diversity), and to identify the most determinant environmental variables at different spatial scales. Results showed that both environmental and spatial processes accounted for significant and comparable variations in both vegetation composition and structure. Local spatial variables provided significant and comparable contribution as regional spatial variables to vegetation composition, while provided more contribution than regional spatial variables to vegetation structure. Topography had an overriding effect relative to soil on both vegetation composition and structure. Multi-scale analyses showed elevation was the most important variable (associated with soil moisture and nutrient) at the regional scale; while microtopography, especially slope aspect and shape, dominated at the local scale. We also demonstrated how vegetation composition and structure varied along environmental gradients. The study revealed the overriding role of topography in determining vegetation attributes in this mountainous dry valley, highlighting the advantage of multi-scale spatial analysis for better understanding spatial variation in vegetation pattern and with their important implications for biodiversity conservation and ecological management in the arid mountain areas.

The Biodiversity Status and Conservation Activities of Singra National Park (SNP) in the Link of Co-Management Strategy

This paper emphasizes the trend of biodiversity and their conservation strategy of Singra National Park (SNP), which is very well known for its characteristics as deciduous forest. Two types of studies were conducted: (i) Study of the vegetation composition and structure and (ii) conservation strategy of the Forest. In the first study, the diversity of plant (trees, shrubs, herbs and climbers) and animal (birds, amphibians, reptiles and mammals) species were measured. A stratified random quadrat method was employed to determine the floral diversity. A total of 32 plant species were recorded including 19 tree species, 5 herbs, 4 shrubs and four climbers. Inventory of fauna species was conducted using a combination of transect walk/ opportunistic and ethno zoological interview methods. Total 28 animal species were recorded of which 13 were birds, 3 were amphibians, 6 were reptiles and 6 were mammals. With regard to the quantitative attributes of total flora and fauna species, the highest number was found in trees (mean, 126.00) and the lowest number was found in mammals (mean, 7.00). The result showed very high significant variation among them. The second study examined the management of the forest, causes of biodiversity loss, administrative problems with management of wildlife. Data were collected from the SNPauthority and questionnaire survey among local people in the study area. It was evident from the study that the people around the forest collect forest flora and fauna illegally. The people are not aware of the importance of forest in various aspects like social, economic, ecological and environmental domains. Forest authorities are trying to involve the people in and around the forest to co-management for conservation and restoration of the forest.

Dynamic of vegetation composition and structure due to post-agrogenic succession (Kostroma region)

The rate and direction of the post-agrogenic succession are determined by the features of agricultural land development in the past. After intensive application of organic fertilizers, as well as cattle grazing, the restoration of woody vegetation slows down, as well as the rate of appearance of forest species resistant to acidic conditions and low enrichment in nutrient elements in the grass. With the intensive application of organic fertilizers, nitrophilic herbal phytocenoses with low floristic diversity exist for a long time. Prolonged haying causes a reduction in the weed-ruderal stage while slowing down the appearance of forest species. At the initial stages of overgrowing for all types of use, the convergence of a number of floristic and ecological-coenotic characteristics of phytocenoses of deposits of a similar age was revealed in the past.

Manitoba’s endangered alvars: an initial description of their extent and status

Alvars are rare in Canada and uncommon globally. This study represents the first formal attempt to describe and delineate the extent of alvars in Manitoba. A systematic examination of the Interlake region’s edaphic and biological characteristics, using a geographic information system, resulted in the identification of 67 sites warranting further field study. Of these sites, 61 were surveyed and information was collected on vegetation composition and structure, soil characteristics, land ownership, and land use. Alvar was confirmed at 28 sites, extending over approximately 3930 ha in five geographically distinct clusters. Four putative types of alvar communities are described: grassland, shrubland, savannah, and wetland. Livestock grazing is the dominant land use and occurs across more than three-quarters of Manitoba alvar. Approximately 12% coincide with mining claims or quarry leases. Two-thirds occur on publicly owned land.