At broad spatial scales, floodplain forests of the southeastern USA are often perceived as either nutrient poor or nutrient rich. Perceived differences in nutrient availabilities between oligotrophic blackwater and eutrophic redwater floodplain forests suggest rates of aboveground net primary production (ANPP) are lower on the former. However, for these floodplain types, microsite variation may influence relationships between nutrient circulation and ANPP to a greater extent than landscape position and geomorphology of their associated watershed. Therefore, our objectives were to compare ANPP, nutrient circulation through litterfall and decomposition, and the microbial biomass among microsites that differed in terms of soils and hydrology within two riverine floodplain forests. The two floodplains used in this study were located along the Satilla River, a Coastal Plain blackwater system, and the Altamaha River, a Piedmont redwater system, both of which are located in southeastern Georgia. Microsite influences on ANPP were not significantly different during 1999 and 2000 for the Satilla (SAT) and Altamaha (ALT) floodplains. Litterfall production and patterns of P and Ca circulation on the SAT floodplain were significantly lower for the driest microsite type during both years. Microbial biomass N and P were also lowest for the driest microsite, especially in 2000. Overall, microsites on the SAT displayed greater variation in P and Ca cycling than did those of the ALT. Litterfall production, nutrient circulation in litterfall and decomposition, and the microbial biomass were similar among microsites of the ALT floodplain during both years. These findings suggest that spatial variability in nutrient cycling may be greater for oligotrophic floodplain forests.
Abstract In the southeastern United States, site preparation methods often involve surface and subsurface tillage used singly or in combination. However, growth responses to these treatments are often inconsistent across sites and physiographic regions. In an effort to gain insight into how pine growth is affected by tillage, the effects of two treatments, machine planting and combination tillage (i.e., disking, subsoiling, and bedding), were examined in terms of biomass partitioning and root system architecture of loblolly pine seedlings (Pinus taeda L.) on Piedmont and Upper Coastal Plain sites in Alabama and Georgia. Our objectives were to evaluate the effects of combination tillage on root system development and examine whether potential effects were related to aboveground measures. Seedling allometry indicated that for all sites and both physiographic regions, machine planting and combination tillage treatments resulted in similar biomass partitioning above- and belowground. Furthermore, on both Piedmont and Coastal Plain sites, root architecture was primarily influenced by the presence of the subsoil “rip” regardless of treatment. These conclusions suggest that compared to machine planting, combination tillage did not affect biomass partitioning on the functional rooting zone of these young pines to a degree that was biologically significant. South. J. Appl. For. 28(2):76–82.
Forest road attributes and best management practices (BMPs) influence sediment delivery at stream crossings. We quantified sediment delivered from 37 stream crossings on truck roads representing a spectrum of road quality and BMPs. Approaches were categorized into road/BMP quality ranks based on slope, template, distance to nearest water control structure, and level of surface armoring (BMP-low, BMP-standard, and BMP-high). Sediment traps installed at stream crossings were monitored bimonthly for one year. Mean sediment mass losses were low; 76 percent of approaches lost ≤ 0.1 Mg yr1, and 94 percent of approaches lost ≤ 1 Mg yr−1. Piedmont approaches provided greater (α ≤ 0.10) median sediment masses (0.04 Mg yr−1) and rates (4.8 Mg ha−1 yr−1) than ridge and valley approaches (0.01 Mg yr−1, 0.5 Mg ha−1 yr−1). Median sediment masses differed among road quality rankings (P ≤ 0.0011). Approaches of BMP-low, BMP-standard, and BMP-high produced median values of 0.45 Mg yr−1, 0.02 Mg yr−1, and 0.001 Mg yr−1. Two BMP-low steam crossing approaches produced sediment masses >1 Mg yr−1, and these sedimentation issues could have been mitigated by additional water control and additional cover of road templates. This research substantiates that appropriate BMP implementation at stream crossings can minimize stream sedimentation.
Article Meßtechnik zur Aufbereitung von Deponiegas / Measurement technology for processing of landfill gas was published on December 1, 1988 in the journal tm - Technisches Messen (volume 55, issue JG).
Abstract Die Begriffe ,Authentizität‘ und ,Autofiktion‘ operieren mit einer Zuschreibung von Eigenschaften zu einer Person oder einem Text. ,Authentizität‘ und ,Autofiktion‘ lassen sich daher rezeptionsästhetisch untersuchen, nicht jedoch als Merkmal des Beobachteten. Die Romane und Interviews Christian Krachts und ihre Wahrnehmung in der Öffentlichkeit illustrieren diesen Zusammenhang. Am Beispiel von Eurotrash lässt sich zeigen, wie der Roman Autorschaft als performatives Konstrukt darstellt und damit die Unmöglichkeit einer Referentialisierbarkeit von Aussagen betont.The terms ,authenticity‘ and ,autofiction‘ operate with an attribution of qualities to a person or a text. This can be analyzed with regard to reception aesthetics, but not as a quality of the observed. Christian Kracht’s novels and interviews together with their public reception illustrate this. The example of his latest novel Eurotrash can be used to show how the text presents authorship as a performative construct and highlights the impossibility of referentializing assertions.
