0000000000729140
AUTHOR
Zigmārs Rendenieks
Impact of climate variability, drainage and land-cover changes on hemiboreal streamflow
ABSTRACTThe aim of the study was to determine the effects of climate variability, agricultural land drainage and afforestation of agricultural land on river discharge. The study was conducted in the Vienziemīte stream basin (6 km2), where discharge was monitored on a daily basis during the time period of 1946–2010. In the stream basin, natural afforestation of agricultural land began in the 1950s, and in the mid-1970s artificial drainage systems were installed in all agricultural land (70% of the total basin area). Climate variability and artificial drainage were the main factors observed to be affecting stream discharge. The changes were most evident in annual and seasonal mean, minimum an…
Meža nozares rīcības politikas ietekme uz meža ainavu struktūru Ziemeļvidzemes biosfēras rezervātā
Elektroniskā versija nesatur pielikumus
Veco mežaudžu telpiskās struktūras izmaiņu ainavekoloģiskā analīze Ziemeļvidzemes biosfēras rezervātā 20.gadsimtā
Pēdējo 70 gadu laikā Latvijā norisinājušies procesi, kas ietekmējuši meža ainavas telpisko struktūru, atstājot iespaidu uz ekosistēmu kvalitāti. Par maģistra darba „Veco mežaudžu telpiskās struktūras izmaiņu ainavekoloģiskā analīze Ziemeļvidzemes biosfēras rezervātā 20. gadsimtā” tēmu izvēlēta veco mežaudžu telpiskās struktūras izmaiņu izpēte. Pētījums veikts, balstoties uz mežu inventarizācijas datu analīzi, izmantojot telpiski statistiskās analīzes metodi. Pētījuma rezultāti interpretēti ainavekoloģiskā kontekstā. Pētījuma objekts ir pāraugušas priežu, egļu, priežu-egļu, melnalkšņu, apšu, ozolu un ošu mežaudzes, kas ir īpaši nozīmīgas kā potenciālie mežaudžu atslēgas biotopi. Lai veiktu v…
Towards Functional Green Infrastructure in the Baltic Sea Region: Knowledge Production and Learning Across Borders
Natural capital is the foundation for delivering multiple ecosystem services important for biodiversity and human wellbeing. Functional green infrastructure (GI) is one of the land management approaches to secure the sustainable use of natural capital. This chapter presents the outcomes of a integrative research for knowledge production and learning towards functional GI in the Baltic Sea Region. The overview of attempts to develop functional GI in Sweden, Latvia, Belarus and the Russian Federation, the countries with different contexts, illustrates similar sets of challenges in the maintenance of GI functions for both biodiversity and human wellbeing. The main challenges are (1) sustaining…
Comparison of input data with different spatial resolution in landscape pattern analysis – A case study from northern Latvia
A suitable spatial scale needs to be selected in geographical and landscape ecological research, and this requires great consideration as different scales have profound effect on derived landscape spatial patterns. Numerous studies have investigated the effects of different scales on landscape metrics using simulated patterns, but few have been conducted to compare different data sources with variable scale for regional- and landscape-scale assessments. Possibly this has occurred because researchers have been prone to use the best available source, a well-known standard, and easiest to use. This study was conducted to assess the impact of input data resolution on values of landscape pattern…
The implications of stand composition, age and spatial patterns of forest regions with different ownership type for management optimisation in northern Latvia
Abstract Forests with different ownership type often form complex mosaics of stands, thus adding new challenges to the spatial planning of sustainable management in forested landscapes. This study attempted to analyse the spatial patterns and age structures of forest regions with different ownership type and to formulate suggestions for the optimisation of tactical planning of forest management planning by addressing ecological functionality at the landscape level. We hypothesised that structure of forests of various ownership groups differs significantly. National forest inventory data from 2011 was used in this study to compare spatial patterns of forest stands and clearcuts, as well as f…
Effects of stand-level and landscape factors on understorey plant community traits in broad-leaved forest of the boreo-nemoral zone in Latvia
Abstract Knowledge of the limiting processes shaping the composition of plant communities of woodland is important in conservation of biological diversity. The aim of our study was to examine the effect of stand-level factors (soil and canopy composition, age and area) and landscape factors (fragmentation of broad-leaved forest, distance to a historical manor house, and past history) on plant community trait composition in broad-leaved forest. We hypothesized that the plant functional community is shaped by both dispersal filtering due to landscape factors and by environmental characteristics. We recorded all vascular plants, described canopy composition and estimated soil characteristics i…