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- SAGE Publications (3)
- John Wiley & Sons, Inc. (2)
- Copernicus (1)
- Nature (1)
Xylem Anatomical Variability in White Spruce at Treeline Is Largely Driven by Spatial Clustering
(2020)
The ecological function of boreal forests is challenged by drastically changing climate conditions. Although an increasing number of studies are investigating how climate change is influencing growth and distribution of boreal tree species, there is a lack of studies examining the potential of these species to genetically adapt or phenotypically adjust. Here, we sampled clonally and non-clonally growing white spruce trees (Picea glauca [Moench] Voss) to investigate spatial and genetic effects on tree ring width and on six xylem anatomical traits representing growth, water transport, mechanical support, and wood density. We compared different methods for estimating broad sense heritability (H2) of each trait and we evaluated the effects of spatial grouping and genetic grouping on the xylem anatomical traits with linear models. We found that the three different methods used to estimate H2 were quite robust, showing overall consistent patterns, while our analyses were unsuccessful at fully separating genetic from spatial effects. By evaluating the effect size, we found a significant effect of genetic grouping in latewood density and earlywood hydraulic diameter. However, evaluating model performances showed that spatial grouping was a better predictor than genetic grouping for variance in earlywood density, earlywood hydraulic diameter and growth. For cell wall thickness neither spatial nor genetic grouping was significant. Our findings imply that (1) the variance in the investigated xylem anatomical traits and growth is mainly influenced by spatial clustering (most probably caused by microhabitat conditions), which (2) makes it rather difficult to estimate the heritability of these traits in naturally grown trees in situ. Yet, (3) latewood density and earlywood hydraulic diameter qualified for further analysis on the genetic background of xylem traits and (4) cell wall thickness seems a useful trait to investigate large-scale climatic effects, decoupled from microclimatic, edaphic and genetic influences.
Winter warming is ecologically more relevant than summer
warming in a cool-temperate grassland
(2019)
Water Consumption of Agriculture and Natural Ecosystems along the Ili River in China and Kazakhstan
(2017)
The frequency of sudden, strong warming events is projected to increase in the future. The effects of such events on spring phenology of trees might depend on their timing because spring warming has generally been shown to advance spring budburst while fall and winter warming have been shown to delay spring phenology. To understand the mechanism behind timing-specific warming effects on spring phenology, I simulated warming events during fall, mid-winter and at the end of winter and quantified their effects on bud dormancy depth and subsequently on spring leaf out. The warming events were carried out in climate chambers on tree seedlings of Betula pendula and Fagus sylvatica in October, January, and February. Control seedlings were kept at photoperiod and temperature matching the daily fluctuating field conditions. Warmed seedlings were kept 10°C warmer than the control seedlings for 10 days during the respective warming periods. Warming in October increased bud dormancy depth and decreased spring leaf-out rate only for F. sylvatica, whereas warming in February reduced bud dormancy depth and advanced spring leaf-out rate only for B. pendula. Neither bud dormancy depth nor spring leaf out rate were affected by January warming. The results indicate that warming-induced changes in bud dormancy depth may explain species- and timing-specific warming effects on spring phenology. The extent to which the timing of bud dormancy phases is species-specific will influence among-species variation in future spring leaf out times.
For many years, rangeland ecologists have debated about whether the state of semi-arid and arid rangelands is the expression of an ecological equilibrium or non-equilibrium dynamics reached in response to grazing livestock. Since the problem has been considered at different spatial scales, it is recognised that the competing concepts of equilibrium and non-equilibrium dynamics need to be integrated. Furthermore, the role of environmental variables as vegetation driving factors has long been ignored in the discussion on grazing effects on ecosystems. Present thesis, examines the dependence of plant communities on environmental in particular site-ecological conditions in three ecosystems of Western Mongolia established along a precipitation gradient to detect the vegetation-driving ecological factors involved. Furthermore, grazing impact is exemplary assessed in a desert steppe at additional spatial scales of plant communities and population. At the landscape level, a classification of plant communities in dependence on environmental conditions is carried out. Additionally, the investigations focused on the impact of grazing on soil and on the occurrence of grazing-mediated plant communities. Data were sampled along an altitudinal gradient between 1150 m to 3050 m a.s.l. from arid lowland with desert steppe via semi-arid mountain steppe to humid alpine belt. Within each altitudinal belt, data sampling was carried out along grazing gradients, established from grazing hot spots to areas distant from them. By means of an environmentally based vegetation classification, factors with highest explanation values for largest variation in vegetation were identified and considered as most responsible for vegetation patterns. To validate and affirm the classification, three different statistical methods are applied: environmentally adjusted table work of vegetation relevés supported by cluster analysis of species distribution, detrended correspondence analysis of vegetation data separately from environmental data, and the principle component analysis of only environmental data. Vegetation-driving factors change along the altitudinal gradient from abiotic forces in the desert steppe, as e.g. altitude and soil texture, to abiotic and biotic forces in the alpine belt represented by soil texture, soil nutrients and grazing. Vegetation and soil of all ecosystems respond to grazing but with different patterns and to a different extent. While desert steppe does not indicate grazing communities, mountain steppe demonstrates grazing communities at fertilised sites and alpine belt at nutrients depleted sites. Thus, the grazing sensitiveness of the ecosystems is assumed to be linked with plant productivity and the role of vegetation as site-determining factor (Chapter 2). To examine grazing impact at lower spatial scales on desert steppe as the ecosystem with lowest grazing sensitiveness at the landscape scale, at community scale the total number of species, the total vegetation cover, the percentage of annual species, the cover of annual species, and properties of soil nutrient along gradients of grazing intensity within three different communities were assessed. Vegetation parameters respond to grazing in different ways, and the responses of the same parameters vary between plant communities. Correlations with grazing intensity indicate only partly statistical significance. Significant correlations of grazing intensity with concentrations of soil nutrient point to eutrophication in two communities. A comparison of vegetation and soil properties refers to a greater indirect influence of grazing via increased soil nutrients than the direct effect on vegetation (Chapter 4). At the population level, data about stand density, aboveground biomass, individual plant weight, and the proportion of flowering plants of the dominant dwarf semi-shrub Artemisia xerophytica were collected along a grazing gradient. Soil data were used to distinguish between grazing and edaphic influences. All parameters of Artemisia xerophytica reflect the assumed gradient of grazing intensity up to 800 m distance from the grazing hot spot. As grazing pressure decreases, plant density and total biomass per plot increase. The average shrub weight, an indicator of plant vitality, is related to both: distance from the grazing hot spot and stand density, which may be explained by additional intraspecific competition at higher densities. At a longer distance, these effects are masked by variations in soil parameters determining water availability, leading to quite similar degradation forms. These results are in contrast to other studies carried out at the scale of plant communities which did not detect significant changes along a grazing gradient. One explanation is the different map scale: the study took place only within a single plant community comparing populations of one species (Chapter 3). The comparative study demonstrates that even arid desert steppes of western Mongolia display equilibrial and non-equilibrial properties, depending on the observational scale: while no grazing mediated plant communities could be identified at the landscape scale as predicted by the non-equlilibrium model, at the community level vegetation parameters imply an intermediate position between equilibrium and non-equilibrium system. At the population level, the results clearly reflect the grazing gradient as predicted by the equilibrium model (Chapter 4). As a consequence, the assessment of vegetation dynamics and grazing impact in rangelands requires a multiple-scale approach that duly considers different vegetation properties responding differently to grazing, climatic and edaphic variability at different spatial scales. It is further suggested, that future research should draw comparisons between landscapes that co-evolved with herbivory, and those that did without (Chapter 4).
Vegetation dynamics on abandoned terraces of Sicily: the course and driving factors of succession
(2007)
Secondary succession processes have been widely studied in Europe for some agroecosystems, but not for terraced ones. The first part of the present study focuses on a description of the plant communities involved in secondary succession processes on Sicily (Italy) a) from a floristic and structural point of view and b) from a species diversity point of view. In order to obtain these results, 129 vegetation relevés (sensu Braun-Blanquet) were made on abandoned terraces in five of the main terraced areas of Siciliy: 1) the Aeolian Islands, 2) Pantelleria Island, 3) Mt. Etna, 4) the Palermo Mts. and 5) the Hyblaean Plateau. Only abandoned vineyards or grain crop fields were selected as sample plots, always 50 m2-sized. The results of biodiversity evaluation by t-tests and ANOVA showed that vascular plant diversity is linked to disturbance regime and to abiotic factors (especially geological substrate). Especially grazing increases species richness. Moreover, it was found that on limestone species richness is higher than on volcanic substrates. Vegetation relevés were also analysed with DCA and TWINSPAN. The resulting 14 sample plot groups (= clusters) were then used to check the dynamic relations. From a floristic point of view, plant communities involved in secondary succession processes on Sicilian terraces are quite different between and within the five study areas. This is mainly due to different substrate and bioclimatic conditions. Moreover, vegetation is strongly influenced by abandonment age and disturbance status. If no disturbance biases succession, then plant communities evolve rather rapidly (30-50 years) to maquis communities. If frequent fires or intense grazing occur, secondary succession is blocked in a "steady state". The second part of the present study focuses on the colonization mechanisms of old fields by woody species. In a first section, the existence of 1) the neighbourhood effect and 2) the safe-site effect are checked by analyzing 51 transect relevés, made up of 357 subplot relevés (1x1m). The transects were made in target fields 1) with older neighbour (i.e. old succession stage characterized by maquis communities) and 2) with older neighbour absent within a 100 m-distance. All woody species individuals were counted, recording if they grew within the influence of a potential safe site (former crop plants of vine and the terrace wall base). Data evaluation by Kruskal-Wallis ANOVA and Mann-Whitney Rank Sum confirmed the existence of the two effects. Moreover, it was shown that animals as dispersal vectors strongly influence these effects. For the neighbourhood effect, seed dispersal distance is the crucial point, while for the safe site effect 1) passive facilitation (i.e. animals tend to create heterogeneous seed rain patterns because they frequent certain microhabitats more often than others) and 2) active facilitation (i.e. the positive influence of an existing woody or herbaceous plant individual on the establishment or the growth of another one) are crucial. The second section describes the performance of establishment of Quercus ilex L. in different microsites of terraced old fields. In November 2004, acorns were buried on a North-facing slope and on a South-facing slope in five different microsites: 1) under vine plants, 2) at wall bases, 3) under the canopies of isolated shrubs, 4) between small rock accumulations and 5) in open spaces (i.e. outside of any of the previously named microsites). In monthly checks, seedling emergence, survival, height and leaf number were recorded. Moreover, in April and July were measured air temperature and air humidity in the different microsites. Overall emergence rate was 52.4% (n = 1,020). More seedlings emerged on the South-facing slope (S; 59.8%) than on the North-facing slope (N; 45.0%). Emergence was higher when acorns were buried under vine plants and at the wall base than in other microsites of the old fields. At the end of the experiment (September 2006), 45.3% of all emerged seedlings were still alive (29.2% on N, 58.9% on S). Survival was higher in general on the South-facing slope, and higher under vine plants and at the wall base than in the open spaces of the old fields. From literature, it is known that seed vitality, seed germination and seedling survival of Quercus ilex are favoured by shady, wet and fresh conditions. The temperature and air humidity measurements showed that at the wall base, under vine plants and under isolated shrubs environmental conditions are milder than in open spaces. However, even if temperature and relative air humidity seem to play an important role for Quercus ilex seedling emergence and survival, they did not unambiguously explain the differences between the safe site types. A factor of major importance is probably soil moisture. As a last part, the present study discusses what does the obtained results mean for terrace landscape conservation and biodiversity management.
Vegetation dynamics and carbon sequestration of Holocene alder (Alnus glutinosa) carrs of NE Germany
(2010)
Erlenwälder auf Moorstandorten werden oft als Zeichen von Moordegradation und Torfoxidation gewertet, aber erlenholzreiche Moorablagerungen (teilweise mehrere Meter tief) sind unter anderem in Nordostdeutschland weit verbreitet. Die Genese von Erlen-Holztorfen wurde bisher überwiegend durch das Konzept der „Verdrängungstorfbildung“ erklärt. Hierbei wird ein von gehölzfreier Vegetation akkumulierter Torf nach einer Grundwasserabsenkung durch nachträglich einwachsende Baumwurzeln verändert. Dieses Prinzip ist aber auf tiefgründige Erlen-Holztorfe nicht übertragbar, da Alnus glutinosa auf naturnahen Moorstandorten meist nur wenige Dezimeter tief wurzelt. Anliegen der vorliegenden Dissertation mit dem Titel „Vegetation dynamics and carbon sequestration of Holocene alder (Alnus glutinosa) carrs in NE Germany“ war die Identifizierung torfbildender Erlenwälder. Die torfbildende Vegetation, die Wasserstände während der Torfbildung und die Vegetationsdynamik dieser bewaldeten Niedermoore wurden durch Analysen von Makrofossilien, Pollen und sonstigen Mikrofossilien (u.a. Pilz-, Pflanzen-, und tierische Reste) rekonstruiert. Hierbei wurden in enger Kooperation mit dem Promotionsvorhaben von Frau Anja Prager (Non-pollen palynomorphs [NPPs] from modern alder carrs [NE Germany] - Tools for reconstructing past vegetation and site conditions) ca. 150 bisher unbekannte Mikrofossilien beschrieben und teilweise identifiziert. Die Datenauswertung wurde anhand von Fossilien-Diagrammen und statistischen Methoden (DCA, Clusteranalysis; Broken Stick Analysis) durchgeführt. Zur Altersbestimmung erfolgten 14C-AMS-Datierungen und der Kohlenstoffgehalt wurde über die Bestimmung der Trockenrohdichte ermittelt, wobei ein durchschnittlicher Kohlenstoffanteil von 56% angenommen wurde. Die untersuchten Erlen-Holztorfe wurden überwiegend direkt in Erlenwäldern abgelagert („Echter Bruchwaldtorf“); sind aber auch teilweise als Verdrängungstorfe aus vorherigen Seggentorfen entstanden oder in von Weiden dominierten Gehölzen gebildet worden. Die jährlichen Medianwasserstände der torfbildenden Erlenwälder lagen einerseits über Flur („sehr nass“-„very wet“) und zum anderen 0 bis 10 cm unter Flur („nass“ - „wet“). Die Vegetationszusammensetzung der sehr nassen Erlenwälder ähnelte teilweise dem Wasserfeder-Erlen-Wald und in einem Fall dem Zweizahn-Erlen-Bruchgehölz. Die nassen Erlenwälder konnten nicht auf der Ebene von Vegetationsformen rekonstruiert werden; charakteristisch war das häufige Auftreten von Urtica und eine Carex-dominierte Krautschicht. Über einen Vergleich der Mikrofossilien der Erlenholz-Tofe mit Mikrofossilien von Oberflächenproben aus rezenten Erlenwäldern konnten die Medianwasserstände nasser, torf-akkumulierender Erlenwälder auf 0-10 cm unter Flur festgelegt werden. Alle untersuchten Profile zeigten eine zyklische Bewaldung mit Zwischenphasen von Offenvegetation (meist Seggenriede). Als Bindeglieder zwischen Erlenwald und Seggenried traten teilweise Weidengebüsche auf, welche sich mitunter auch langfristiger etablieren konnten. Die zyklische Vegetationsentwicklung von Seggenrieden, Weidengebüschen und Erlenwäldern basierte fast ausschließlich auf einem schwankenden Wasserangebot im Moor. Dieses war fast immer die Folge von zyklischen Ent- und Wiederbewaldungen der umliegenden, grundwasserfernen Standorte durch den Menschen. Die „Echten Bruchwaldtorfe“ sind unter verschiedenen hydrologischen Bedingungen entstanden (Verlandungs-, Versumpfungs-, Überrieselungs- und Überflutungsmoor). Die Kohlenstoff-Akkumulationsraten („LORCA“-long-term apparent rate of carbon accumulation) liegen zwischen 31-44 g C m-2 yr-1 in sehr nassen und 50-81 g C m-2 yr-1 in nassen Erlenwäldern. Die höheren Akkumulationsraten in nassen Erlenwäldern können durch die deutlich steigende Produktivität von Erlen-Wäldern schon bei leicht sinkenden mittleren Wasserständen erklärt werden. Eine Verringerung der durchschnittlichen Wasserstände von über Flur zu leicht unter Flur führt annähernd zu einer Verdopplung der Primärproduktion von oberirdischem Holz und Wurzelholz. Dadurch gelangt auch ein größerer Anteil von Wurzelholz in den dauerhaft wassergesättigten Bereich. Da mit sinkenden Wasserständen auch die oxidative Zersetzung zunimmt, ist für die teilweise sehr hohen Torfakkumulationsraten in Erlenwäldern die Zersetzungsresistenz von Holz (Lignin) von zentraler Bedeutung. Die Akkumulationsraten nasser Erlenwälder übersteigen die borealer Waldmoore deutlich und erreichen die Größenordnung der Kohlenstoffakkumulation in den tropischen Waldmooren Süddostasiens. Die vorliegende Dissertation belegt die weitverbreitete und oft umfangreiche Torf- bzw. Kohlenstoffakkumulation in Holozänen Erlen-Wäldern Nordostdeutschlands.
AbstractArchetype analysis is a promising approach in sustainability science to identify patterns and explain mechanisms shaping the sustainability of social-ecological systems. Although considerable efforts have been devoted to developing quality standards and methodological advances for archetype analysis, archetype validation remains a major challenge. Drawing on the insights from two international workshops on archetype analysis and on broader literature on validity, we propose a framework that identifies and describes six dimensions of validity: conceptual; construct; internal; external; empirical; and application validity. We first discuss the six dimensions in relation to different methodological approaches and purposes of archetype analysis. We then present an operational use of the framework for researchers to assess the validity of archetype analysis and to support sound archetype identification and policy-relevant applications. Finally, we apply our assessment to 18 published archetype analyses, which we use to describe the challenges and insights in validating the different dimensions and suggest ways to holistically improve the validity of identified archetypes. With this, we contribute to more rigorous archetype analyses, helping to develop the potential of the approach for guiding sustainability solutions.