| 1. |
- Gong, Peichen
(författare)
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集体林权制度改革中农户流转收益合理性分析——以江西省遂川县为例
- 2009
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Ingår i: Scientia Silvae Sinicae. - 1001-7488. ; 2009, s. 134-140
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Höglund, Odd
(författare)
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Device and method for tissue ligation
- 2017
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- A medical device (100) for tissue ligation comprises a band (110) having perforations (122) and rungs (120) defined therein. A locking case (130) is connected to the band (110) and has a channel (150) dimensioned for reception of the band (110). A locking member (140) of the locking case (130) is configured to interlock perforations (122) and rungs (120) defined in the band (110). The channel (150) comprises an arching portion (152) into which the band (110) at least partly protrudes by arching over the locking member (140) when the locking member (140) engages a rung (120) of the band (110).
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| 3. |
- Jiang, Tao
(författare)
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Use of the Nitrogen/Carbon Ratio (N/C) and Two End-Member Sources Mixing Model to Identify the Origins of Dissolved Organic Matter from Soils in the Water-Level Fluctuation Zones of the Three Gorges Reservoir
- 2019
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Ingår i: Huan Jing Ke Xue. - 0250-3301. ; 40, s. 2647-2656
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Tidskriftsartikel (refereegranskat)abstract
- Soil dissolved organic matter (soil DOM) plays a crucial role in the environmental fate of pollutants because of its exceptional biogeochemical reactivity. Therefore, tracing the sources and understanding the properties of DOM through chemical characterization is important for clarifying the "structure-reactivity" of DOM in the environment. In this study, traditional elementary analysis methods including nitrogen/carbon ratio (N/C) determinations and derived two end-member source-loads mixing models were applied to soil DOM extracted from the water-level fluctuation zones of the Three Gorges Reservoir (TGR) area. The results were further compared to other characterization techniques that operate on the molecular scale (e. g., FTIR and analytical pyrolysis techniques). The ultimate objective was to assess the performance of N/C ratio and two end-member modeling for identifying the DOM sources. Additionally, a photo-bleaching kinetic experiment was conducted to test the correlation between DOM reactivity and its source-loadings. Results showed, based on the N/C ratio and mixing modeling, all soil DOM samples in the TGR area share "dual-source" characteristics, namely, allochthonousness (e. g., terrestrial) and autochthonousness (e. g., internal) attributes, which is in agreement with other advanced characterization tools. The traditional method results were comprehensible in light of the data from molecular techniques, but the information revealed only reflects certain aspects of DOM compositional characteristics. It can be concluded that the N/C ratio and mixing modeling can validate general sources of soil DOM, but not information about specific components. Meanwhile, the significant correlation between the photo-bleaching kinetic constant and N/C and source-loadings indicated that these two parameters can be used as rapid indicators to estimate soil DOM reactivity in photochemical processes. However, it should be emphasized that it remains essential to employ multiple characterization methods to investigate the biogeochemistry of soil DOM, so as to increase the characterization resolution with regard to the heterogeneity of DOM.
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| 4. |
- Ling, Qiu, et al.
(författare)
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The application of vegetation structure information in biotope mapping models towards urban biodiversity
- 2010
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Ingår i: Acta Ecologica Sinica. - 1000-0933. ; 30, s. 3688-3699
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Tidskriftsartikel (refereegranskat)abstract
- Former models of biotope mapping have not taken enough information about temporal and spatial vegetation structure into consideration. It is shown in a number of studies that vegetation structure has an impact on aspects of biodiversity. The purpose of this study is thus to design a modified urban biotope mapping model that includes temporal and spatial vegetation structure in order to obtain more information concerning urban biodiversity. A refined model was developed based on a biotope classification, and applied to a green structure system in Helsingborg in southern Sweden. It includes four parameters of vegetation structure: continuity of vegetation cover, age of dominant trees, horizontal structure, and vertical structure. The major green structure sites were determined by interpretation of panchromatic aerial photographs assisted with a field survey. A set of biotope maps was constructed on the basis of each level of modified classification. By means of identifying continuity of woodland using ancient woodland indicator species (AWIS), and distribution of animals in the green space in relation to vegetation structure, the results indicate that some biotopes with a number of AWI species are long-continuity woodlands with high or potentially high biodiversity value, and that the spatial vegetation structure and age of stands influence the richness and abundance of the avian fauna and rabbits. It is concluded that the modified biotope mapping involving both temporal and spatial vegetation structures is an important methodology when investigating.
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