dcca 中文意思是什麼

dcca 解釋
二氯異氰脲酸
  1. 3 eight communities are identified by gradient analysis in desert - oasis ecotone, and species are divided into 5 ecological groups. dca ordination is superior to cca and dcca. variation of vegetation explained by environmental and spatial factors reaches 23. 4 % ; among these the species matrix explained by non - spatial soil factors account for up to 11. 5 % of variation, spatial variation that is not shared by soil factors explains up to 11. 6 %, their interaction explains up to 0. 3 %

    3 、通過梯度分析，阜康荒漠綠洲過渡帶群落可分為8個類型，物種可分成5個生態類型； dca排序效果優于cca和dcca ；土壤和空間因子解釋了植被分異的23 . 4 ，其中土壤因子佔11 . 5 ，空間因子佔11 . 6 ，二者交互作用佔0 . 3 。
  2. 1. study on classifying and ordination of plant communities : acording to the ecological relationship between plant species, plant communities and environment, we study the communities types, structure and distributing pattern of midland of taihang mountain by using twinspan, dca, cca, dcca and so on

    植物群落的分類和排序研究：應用twinspan分類和dca 、 cca 、 dcca等方法，從植物種、植物群落與環境的生態關系方面，研究了太行山中段各群落類型、結構及分佈格局。
  3. The preparation of optically active composite is a promising alternative to obtain a kind of new and competitive sensing membrane for fiber optic sensors, and has attracted the global attention. in this thesis, the modified sol - gel sensing membranes based on fluorescence quenching have been prepared by using tetraethoxysilane ( teos ) and dimthyldimethoxysilane ( dds ) as the main material, formamide as the drying control chemical additive ( dcca ), ru ( phen ) 3cl2 and ru ( bpy ) 3cl2 as the indicator. this kind of membranes is crack - free and has low indicator - leaking rate

    本文以四乙氧基硅烷（ teos ） 、二甲基二乙氧基硅烷（ dds ）為主要原料，以甲酰胺為控制乾燥劑，二價釕離子絡合物釕（ ） ?聯吡啶（ ru （ bpy ） _ 3cl _ 2 ）和釕（ ） ?菲咯啉（ ru （ phen ） _ 3cl _ 2 ）為熒光指示劑，採用改進的溶膠凝膠技術，通過添加控制乾燥劑和有機摻雜兩種手段，制備了基於熒光猝滅原理的光纖氧敏感膜。
  4. The ratio of tetraethyloxysilane ( teos ) : ethanol : distilled water is 1 : 3 : 4. n - n " dimethyl formamide ( dmf ) was used as solvent and drying control chemical additive ( dcca ) in a proportion of 0. 3 dmf / ethanol volume ratio. drops of hf / hc1 mixture acid was added to promote hydrolysis ( ph = 2 )

    溶劑的選擇對基質凝膠孔的形狀基本沒有影響，但對其孔徑分佈有較大影響:在hf / hci混合酸催化情況下， dmf溶劑的樣品孔徑最小， dmf /乙醇混合溶劑的其次，乙醇溶劑的樣品孔徑最大。
  5. By using of the richness, diversity and evenness indices, combined with twinspan, dca, dcca, multi - factors regression, correlation analysis techniques and so on, species diversity and diversification mechanism were studied. the communities were classified into eight types by twinspan. the first axis of dca indicated basically the diversification of soil water, while the second axis indicated basically the disturbance degree by people. the correlations between n, organic matter, elevation and the first axis are negative association, and the others are positive

    通過豐富度指數、物種多樣性指數和均勻度指數，結合twinspan 、 dca 、 dcca排序，多元回歸和相關分析，研究了物種多樣性及其變化機制，把植物群落分為8個群落類型；物種多樣性指數的dcca第一軸基本上反映了土壤水分的變化，第二軸基本上反映了人類對群落的干擾程度，物種多樣性指數隨土壤水分的增加而增大，隨人類的干擾程度的增加而減小。
  6. The abundance of flowering plants and ferns is increased exponentially along it, and that of conifers change a little under low heat and water conditions, while the abundance of conifers increased exponentially along the axis under high heat and water conditions. dcca and cca showed the similar results as that of dca

    被子植物與蕨類植物豐富度在dca第一軸上具有一致的排序特徵，即呈現對數增長模型，而裸子植物豐富度的變化隨水熱條件的增加而改變的很小，但到高熱量、高水分條件下，豐富度迅速的增加，呈冪指數增長趨勢。
  7. The dcca ordination improves relativity between species and environmental factors. so it avails to exp lain the ecology meanings of ordination axis. but compared with dca ordination graph, the points distribution of two - dimension graph of dcca ordination is much thicker and more concentrated, which causes the limit of plant community types much more obscure

    Dcca排序大大提高了種與環境的相關性，更有利於排序軸生態意義的解釋，但其二維排序圖與dca排序圖相比，點的分佈更加緊湊、集中，使得群落類型間的界限變得更加模糊，因而如果同分類方法結合使用， dca在樣地和物種排序上的效果好於dcca和cca 。
  8. So if dca combines with classified methods, the ordination effect on samples and species is better than that of dcca and cca. 2. fso study on plant communities : we applly fuzzy set ordination ( fso ) to analyze the environmental factors and vegetation data

    植物群落的模糊數學排序研究：運用模糊數學排序對樣地的環境因子和植被數據進行了直接梯度分析，結合twinspan分類結果，與dcca比較，模糊數學排序直觀的得出了環境因子和植物群落間的關系，解析度較高。
分享友人
分享到 Line

分享到臉書