Kooperativer Bibliotheksverbund

Berlin Brandenburg

and
and

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Language: English
    In: Forest Ecology and Management, 01 January 2016, Vol.359, pp.74-82
    Description: Harvesting and logging with heavy forest machines cause soil damage that may restrict forest soil functions. Although the recovery ability of compacted forest soils depends on the soil properties, little is known about the long-term structure recovery of different soils following forest operations. The aim of our study was to evaluate the soil structure recovery of three different soil types. Therefore, we applied a space-for-time substitution approach (10, 20, 30 and 40 years after the last machine impact) to study selected sites in Lower Saxony, Germany, using the following as proxies: bulk density, carbon dioxide (CO ) concentration in soil gas, and the relative apparent gas diffusion coefficient ( / ). At sites with high biological activity and high clay content (Cambisols on limestone), recovery occurred 10–20 years after last traffic impact. At these sites, 10 years after the last traffic impact, gas diffusivity at the wheel track was half of the gas diffusivity of the undisturbed soil, and soil gas CO concentrations were significantly higher at the wheel tracks. At the 20-, 30-, and 40-year-old skid trails, there were no significant differences between the untrafficked reference and the soil frequented by vehicles. Regardless of the kind of traffic impact (wheel track, mid line, side strip or undisturbed reference soil), all investigated parameters indicated that soil structure becomes more favourable with increasing time since the last forest interference. In contrast, loamy sandy soils (Podzols on glacial drift and sand) showed low recovery ability. Forty years after the last machine impact, gas diffusivity was still significantly reduced at the wheel track. Cambisols at loess-covered sandstone showed neither strong impact of forest traffic on soil structure nor changes in soil structure 20–40 years after last traffic impact. In general, bulk density turned out not to be a sufficient proxy for soil structure recovery.
    Keywords: Soil Gas Diffusivity ; Soil Carbon Dioxide ; Soil Compaction ; Soil Structure Recovery ; Forestry ; Biology
    ISSN: 0378-1127
    E-ISSN: 1872-7042
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Language: English
    In: Geoderma, 01 July 2017, Vol.297, pp.61-69
    Description: The use of heavy machinery for timber harvesting causes soil damage, which may restrict forest soil functions over decades. Numerous studies have demonstrated the negative impact of soil compaction on soil physical properties, but the effects of compaction of forest soils on soil chemical and biological processes like the phosphorus availability are largely unknown. Aim of our study was to analyze the effect of skidding activity on the P dynamics on skid trails and the soil recovery ability after skidding. Furthermore, we wanted to assess if acid phosphatase activity is an appropriate indicator of soil structure damage after compaction. We investigated the phosphorus availability, acid phosphatase activity, TOC, pH value, and fine root density of soil samples from skid trails and from control plots without any skidding effect. We conducted our studies at three sites (Göttingen: Cambisols on limestone, Heide: Podzol on glacial drift and sand, and Solling: Cambisols at loess-covered sandstone) in Lower Saxony, Germany 10 to 40 years after last traffic impact in a space-for-time substitution. We observed mainly higher P concentrations and higher pH values at the wheel tracks than in the control. TOC was predominantly higher at the wheel tracks, but lower TOC at the wheel tracks was also found. In the acidic loams of the Solling region, the amount of mineralized phosphate was much higher in the tracks compared to the control areas 10 to 30 years after last traffic impact. This suggests a decoupling of P mineralization from P uptake in the wheel tracks for several decades. Furthermore, higher as well as lower phosphatase activity at the wheel tracks compared to the untrafficked control was found, but higher phosphatase activities at the wheel tracks were predominant. Acid phosphatase activity was strongly correlated with TOC, but did not correlate with the time since last traffic impact and the gas diffusivity of the soil. Therefore, our results did not confirm that acid phosphatase activity is an appropriate soil biological indicator of soil compaction and structural recovery.
    Keywords: Acid Phosphatase Activity ; P Availability ; Soil Compaction ; Soil Structure Recovery ; Agriculture
    ISSN: 0016-7061
    E-ISSN: 1872-6259
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Language: English
    In: Annals of Surgical Oncology, 2009, Vol.16(3), pp.676-686
    ISSN: 1068-9265
    E-ISSN: 1534-4681
    Source: Springer Science & Business Media B.V.
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Language: English
    In: Annals of surgical oncology, March 2009, Vol.16(3), pp.676-86
    Description: Isolated limb perfusion (TM-ILP) is an effective limb-sparing treatment for primarily nonresectable soft tissue sarcomas (STS). Surgical margins of STS after ILP were yet not systematically studied. In 47 patients with nonresectable STS, TM-ILP with subsequent tumor resection was performed. Surgical margins were systematically analyzed by light microscopy using the TNM and the Enneking classification. Furthermore, margins were analyzed for tumor regression in terms of improved resectability. Results were correlated with clinical and pathological parameters. Of 47 STS, 44 were classified as high-grade (93.6%) with a median tumor size of 10.0 cm. Primary limb-salvage rate was 85.1%. According to TNM resection margins were complete in 70.2% (R0) and incomplete in 29.8% (R1=21.3%, R2=8.5%). According to Enneking, 27.7% intralesional, 42.6% marginal, 21.3% wide, 2.1% radical, and 6.4% unclassifiable margins were found. Prior surgery and/or radiotherapy significantly decreased margin quality. Ten patients with incomplete resection (three intralesional, seven marginal) had no viable tumor at the plane of dissection, which was designated as "improved margins." Whereas those patients remained relapse free, five patients with viable tumor (not improved margins) at the resection margin had local recurrences. Poor margins were associated with local and distant recurrences and limited disease-specific survival. TM-ILP is effective for achieving limb salvage. Histopathology of surgical margins demonstrates cases with so-called "improved margins" after TM-ILP, which are related to a better outcome even in intralesionally resected tumors. Improvement of margins should be further evaluated as a potential relevant prognostic parameter.
    Keywords: Antineoplastic Agents, Alkylating -- Therapeutic Use ; Melphalan -- Therapeutic Use ; Neoplasm Recurrence, Local -- Prevention & Control ; Sarcoma -- Drug Therapy ; Tumor Necrosis Factor-Alpha -- Therapeutic Use
    ISSN: 10689265
    E-ISSN: 1534-4681
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages