Buddhist monasteries facilitated landscape conservation on the Qinghai-Tibetan Plateau     

Cui  Naixin  Wu  Tong  Wang  Yi-Chen  Zou  Huiting  Axmacher  Jan Christoph  Sang  Weiguo  Guo  Luo 《Landscape Ecology》2022,37(6):1559-1572

Landscape Ecology - The Sanjiangyuan region of the Qinghai-Tibetan Plateau—also known as the “Three Rivers’ Headwaters”—is the origin of the Yellow, Yangtze, and...  相似文献   

Why is the productivity of Douglas-fir higher in New Zealand than in its native range in the Pacific Northwest,USA?     

Richard Waring  Alan Nordmeyer  David Whitehead  John Hunt  Michael Newton  Christoph Thomas  James Irvine 《Forest Ecology and Management》2008,255(12):4040-4046

Douglas-fir (Pseudotusga menziesii (Mirb.) Franco), a native to the Pacific Coast Range in North America, is recognized as a tree that is long-lived and can grow rapidly to standing volumes that approach the highest recorded for temperate conifers. Managed plantations in western Oregon register maximum periodic annual increments (PAI) at ages between 20 and 40 years of ∼30 m³ ha⁻¹ year⁻¹. The same seed source, when planted in New Zealand and elsewhere in the Southern Hemisphere, may attain a PAI of ∼50 m³ ha⁻¹ year⁻¹. Is this higher productivity mainly related to climate or to isolation from native pests? To evaluate the role of climate, we obtained meteorological data from plantation sites in New Zealand and Oregon, from which we established relationships between mean monthly temperature extremes and solar irradiance, air humidity deficits, and frost frequency. Using these empirical relationships, long-term weather records were converted to the meteorological variables required to drive a process-based forest growth model, 3-PG, for sites approaching the most productive in New Zealand and in Oregon. Annual precipitation is similar in both areas, but sites in Oregon receive only 10% during the growing season, resulting in humidity deficits 30% larger than those recorded in New Zealand. According to sensitivity analyses and direct measurements, the more productive Douglas-fir forests in Oregon avoid the limiting effects of summer drought by obtaining water from the subsoil and fractured bedrock. If such forests were under a reduced evaporative demand similar to that in New Zealand, we show that they would exhibit comparable productivity.  相似文献   

From Framework to Forest Activities: A Comparative Analysis of Different Ownership Types in Two Adjacent Regions   总被引：1，自引：1，他引：0  

Christoph Hartebrodt  Silke Bitz 《Small-Scale Forestry》2007,6(3):309-328

The paper examines the interactions between the demands of society, the restrictions due to recreational and protective functions of forests and the intensity and kind of forest management in the various ownership classes in Switzerland (CH) and Baden–Württemberg (BW) in south–west Germany. A survey was carried out among owners of communal forests, private forest landholders owning more than 200 ha of forest land and small-scale forest enterprises with up to 200 ha of forest land. The survey adopted a two-dimensional approach, using regions and comparable ownership classes in order to identify basic differences and underlying key drivers. It became obvious that there are relevant distinctions between the two countries. The paper highlights the present use of forests, the restrictions perceived by their owners, and the underlying management strategies in terms of structure of the forests, tree species composition and thinning activities. In BW the financial function is the dominant motivation for the majority of the private owners. The communities emphasize both timber and non-timber functions of their forests. Except for the protection function (avalanches, rockslides) the utilisation and importance of the forest in CH is lower than in BW. Profitability of forests continues to be a key-driver of intensity of forest management activities, but there is less influence on the choice of basic silvicultural strategies. The results of this comparative survey are placed in the context of a forest policy framework and the medium-term financial situation in the two countries.

Christoph HartebrodtEmail:

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DUPLEX-ULTRASONOGRAPHIC EVALUATION OF THE COMMON CAROTID ARTERY IN THE RESTING, SEDATED AND ANESTHETIZED HORSE     

Nicola  Schmucker  Urs  Schatzmann  PROF  Katrin Budde  DR  Martin Gundel  DR  Christoph E. Jáuggin Hans Peter  Meier  DR 《Veterinary radiology & ultrasound》2000,41(2):168-171

The aim of this study was to determine the blood flow in the carotid artery during halothane anaesthesia by means of duplex-sonography. Seventeen warm blood horses were evaluated in dorsal and lateral recumbency and the results were compared with the values of the same horses resting and under sedation. The cross sectional area of the vessels, the time-averaged maximal blood velocity, time-averaged maximal blood flow and the resistance index were determined and the flow profile was evaluated. During halothane anesthesia the total blood flow shows a significant increase which is not dependent on the positioning of the horse. Mean blood velocity is decreased by sedation and significantly increased during anesthesia. Reduced peripheral resistance is expressed by a decline of the resistance index. After sedation and during recumbency there is an increase in diameter of the carotid artery.  相似文献   

Bücheranzeigen     

Dr. Christoph Hosmann  Dr. Rohmeder  Dr. Schüpfer 《European Journal of Forest Research》1941,63(7):163-168

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Agreement of serum allergen test results with unblocked and blocked IgE against cross‐reactive carbohydrate determinants (CCD) and intradermal test results in atopic dogs     

Natalie K. Y. Gedon  Teresa M. S. A. Boehm  Christoph J. Klinger  Laura Udraite  Ralf S. Mueller 《Veterinary dermatology》2019,30(3):195-e61

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Semi‐quantitative methods yield greater inter‐ and intraobserver agreement than subjective methods for interpreting 99mtechnetium‐hydroxymethylene‐diphosphonate uptake in equine thoracic processi spinosi          下载免费PDF全文

Claudia van Zadelhoff  Anna Ehrle  Roswitha Merle  Werner Jahn  Christoph Lischer 《Veterinary radiology & ultrasound》2018,59(4):469-476

Scintigraphy is a standard diagnostic method for evaluating horses with back pain due to suspected thoracic processus spinosus pathology. Lesion detection is based on subjective or semi‐quantitative assessments of increased uptake. This retrospective, analytical study is aimed to compare semi‐quantitative and subjective methods in the evaluation of scintigraphic images of the processi spinosi in the equine thoracic spine. Scintigraphic images of 20 Warmblood horses, presented for assessment of orthopedic conditions between 2014 and 2016, were included in the study. Randomized, blinded image evaluation was performed by 11 veterinarians using subjective and semi‐quantitative methods. Subjective grading was performed for the analysis of red‐green‐blue and grayscale scintigraphic images, which were presented in full‐size or as masked images. For the semi‐quantitative assessment, observers placed regions of interest over each processus spinosus. The uptake ratio of each processus spinosus in comparison to a reference region of interest was determined. Subsequently, a modified semi‐quantitative calculation was developed whereby only the highest counts‐per‐pixel for a specified number of pixels was processed. Inter‐ and intraobserver agreement was calculated using intraclass correlation coefficients. Inter‐ and intraobserver intraclass correlation coefficients were 41.65% and 71.39%, respectively, for the subjective image assessment. Additionally, a correlation between intraobserver agreement, experience, and grayscale images was identified. The inter‐ and intraobserver agreement was significantly increased when using semi‐quantitative analysis (97.35% and 98.36%, respectively) or the modified semi‐quantitative calculation (98.61% and 98.82%, respectively). The proposed modified semi‐quantitative technique showed a higher inter‐ and intraobserver agreement when compared to other methods, which makes it a useful tool for the analysis of scintigraphic images. The association of the findings from this study with clinical and radiological examinations requires further investigation.  相似文献   

Tonometer validation and intraocular pressure reference values in the normal chinchilla (Chinchilla lanigera)          下载免费PDF全文

Kevin C. Snyder  Andrew C. Lewin  Christoph Mans  Gillian J. McLellan 《Veterinary ophthalmology》2018,21(1):4-9

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UNILATERAL COMPLETE OBSTRUCTION OF THE PRIMARY BRONCHUS IN TWO JUVENILE MACAWS (ARA SPP.)     

Anna Martel-Arquette  Jaimie Miller  Christoph Mans 《Journal of Exotic Pet Medicine》2018,27(4):16-22

Two juvenile macaws presented independently with clinical signs associated with respiratory signs that included coughing, wheezing, and increased respiratory effort and rate. Whole body radiographis were obtained from one patient, and were considered normal. Computed tomography identified unilateral complete primary bronchial obstruction in both cases. Tracheoscopy was performed in both cases and identified a partial obstruction of the syrinx in one case. Biopsy samples collected during tracheoscopy were submitted for microbial culture. Aspergillus spp. was isolated and treatment was unsuccessful for this macaw. The second case was euthanized upon diagnosis. In both cases, a complete necropsy confirmed the primary bronchial obstruction and fungal organisms were identified, consistent with Aspergillus spp. As demonstrated by these two cases, radiography and tracheoscopy do not allow for the diagnosis of primary bronchial obstruction in birds. Therefore, a computed tomography scan is recommended to accurately diagnose this condition in avian patients.  相似文献   

The evolution of multiple‐insecticide resistance in UK populations of tomato leafminer,Tuta absoluta     

Charles Grant  Rob Jacobson  Aris Ilias  Madeleine Berger  Emmanouil Vasakis  Pablo Bielza  Christoph T Zimmer  Martin S Williamson  Richard H ffrench‐Constant  John Vontas  Emmanouil Roditakis  Chris Bass 《Pest management science》2019,75(8):2079-2085

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