diversity indices 中文意思是什麼

diversity indices 解釋
多樣比率
  • diversity : n. 1. 不同，異樣，差異。2. 繁多，多種，多樣，駁雜，參差。
  • indices : index 的復數。
  1. Diversity indices of benthos benthic community

    底棲生物底棲群落多樣性指數
  2. Plant endemism is the key problem in floristic study. analysis of endemism in a flora has significant implications in demonstrating floristic richness and diversity, the relationship between plants and their environment, and also in conserving biodiversity of the flora. in view of the situation that most of the past studies on endemism were qualitative, this study is the first tentative approach to the introduction of quantitative indices to the analysis of floristic endemism, with an purpose to push the study of endemism from qualitative to quantitative. four quantitative indices are introduced, i. e. level of endemism ( l ), coefficient of endemism ( c ), degree of endemism ( d ) and general index of endemism ( a ). mathematical formulae have been given to each of the above indices and explanations for them have been presented, and the scope of their use in floristic studies has been delimited and exemplified in this paper. the result shows that they are of good applicability. the proposed indices embody full information of plant systematics and plant geography. with the aid of qualitative analysis, the application of the proposed indices will improve the comparability and precision of endemism study in floristics

    過去有關特有現象的研究主要限於定性的分析，可比性和精確性較差.該文嘗試引入特有現象的定量化指標，以推動特有現象的分析研究從定性水平向定量水平邁進.所引入的4種定量化指標分別是：特有水平、特有系數、特有度以及特有綜合指數.對每種量化指標都給出了數學表達式，說明了其區系學意義，例證和界定了這些指標在植物區系分析中的應用，結果表明，它們有良好的適用性.這些指標充分地包含了植物系統學和植物區系學的信息.結合定性分析，這些指標的應用將增強植物區系研究的可比性，使植物區系特有現象的分析達到更精確的水平
  3. Community ' s a diversity is measured by simpson diversity index, shannon - wiener diversity index and pielou evenness index. the results show that habitats range in a diminishing sequence of diversity indices from broadleaf forest, broadleaf bush, grassland bush to bamboo forest ; that altitude belts range from 600 - to - 1200 - m belt, under - 600 - m belt to 1200 - to - 1800 - m belt, and no longicorn beetles was found above 1800 m ; months from july, may, june to august, a diversity analysis shows that complicated habitats can hold higher biodiversity

    結果表明，不同生境多樣性指數從高到低的順序是：闊葉林、闊葉灌叢、灌草叢、竹林；不同海拔多樣性指數從高到低的順序是： 600 ? 1200m區間、 600m以下區間、 1200 ? 1800m區間， 1800m以上區間暫未發現天牛科昆蟲；不同月份多樣性指數從高到低的順序是： 7月、 5月、 6月、 8月。
  4. Tfx acts as an execution - only broker associated with the one of the world s most influent market - makers and offers a diversity of leverages on foreign exchange as well as precious metals gold silver and cfds contracts for difference on stocks indices

    瑞匯的投資杠桿組合從最低的0倍到最高的100倍，從而為客戶形成了一個更為有效的投資方式組合，並且避免了對實際投入資金數量的高額要求。
  5. The results were following : ( l ) generally, all four indices showed the similar variation patterns in species diversity ; ( 2 ) generally speaking, the order of species diversity indices changed with the pattern : shrub layer tree layer herb layers ; ( 3 ) the species diversity of evergreen broadleaved forests was larger than that of warm conifer forests ; ( 4 ) the species diversity of forests in meizi lake area has been affected by human factors

    結果表明： （ 1 ）梅子湖森林植被樣地物種多樣性測度的結果，上述4種指標總體上表現出相同的變化趨勢。門）總體看來， 14個樣地的物種多樣性指數在群落不同層次的變化規律為：灌木層喬木層草本層。 （ 3 ）不同植被類型的物種多樣性特徵是：常綠闊葉林暖性針葉林。
  6. Growth indices of artificial cultivated hedysarummaxim. are studied by line transect methods, species diversity indices are calculated to study the sand - fixing effects of hedysarummaxim

    摘要採用樣線法對人工種植羊柴進行研究，調查其生長狀況，並通過研究其物種多樣性來分析羊柴對流沙的固定效果。
  7. Steppe diversity, however, is characterized by higher plant diversity in the ecotone, especially in the forest - meadow region. diversity indices of plant communities reached peak values at the boundaries between the ecotone and the forest zone or the steppe zone, and between the forest - meadow region and the meadow - steppe region within the ecotone

    在森林-草原交錯帶多樣性指數較高，表現在多樣性指數在森林-草原交錯帶與森林帶和草原帶之間以及森林-草原交錯帶內森林草甸區和草甸草原區之間的邊界不同程度地出現峰值。
  8. The structural diversity indices of all kinds of the community indicated that the community types, the other environmental factors, and human activity are main factors effecting structure diversity

    不同群落類型的結構多樣性研究表明：群落類型、生境條件、各環境因子和人類活動是影響群落結構多樣性的主要因素。
  9. The main results are as following : 1 species diversity indices are significantly different among communities in desert - oasis ecotone, but are low in general ; diversity indices based on important value and cover are more properly in arid desert areas

    主要結論如下： 1 、阜康荒漠綠洲過渡帶物種多樣性在群落間差異顯著，總體上多樣性水平較低；對荒漠植被，以重要值或蓋度為指標計測多樣性指數較為可行。
  10. The differences of biodiversity indices and vegetation coverage between the designed vegetation restoration pattern and the field data indicated that alpha and beta diversity indices were decreased in some parts of the region after vegetation restoration, however, vegetation coverage was reasonably increased, which would enhance the capability of soil and water preservation, thus could improve the ecological security of the region

    通過對比分析現狀植被蓋度及生物多樣性與植被恢復格局預測結果的差異，對區域植被恢復的效果進行評價，認為盡管植被恢復格局設計使部分區域生物多樣性下降，但它整體提高了地表植被覆蓋度，增強了抵禦土壤侵蝕的能力，對保障區域生態安全具有積極的效果。
  11. Biodiversity indices are much influenced by the types of the vegetation in jinfo mt. the species richness index, diversity index and evenness index of the plots in karst area raised when the plots were jamming early and slightly ; species richness index and diversity index of the plots in nonkarst area raised when the plots were jamming early and slightly, but evenness index fell. the diversity index and species richness index of original vegetation in karst area are lower than in nonkarst area

    不同植被類型顯著影響其生物多樣性的變化，金佛山石灰巖地區植被在受到中輕度人為干擾初期，其物種豐富度和多樣性、均勻度指數均有提高；砂頁巖地區植被受到中輕度干擾，豐富度和多樣性指數有所提高，均勻度指數呈相反趨勢；石灰巖地區原生植被生物多樣性和物種豐富度指數較砂頁巖地區的原生植被低。
  12. The results shows that the community richness, species diversity indices and evenness of tree layer and shrub layer share the same order, of which is higher in pure limestone region than that of in pure dolomite region, but it reverse in herb layer ; the coefficient of similarity is considerably low between all plots, while species turnover rate is quite high among the plots and is higher in dolomite region than that of in limestone ; in different karst regions, karst processing leads to niches diversity characterized by special morphologies and special element geochamical features, and therefore affect the dynamic and features of plant communities

    我們在最有代表性之一的貴州茂蘭喀斯特森林保護區選取純灰巖和純白雲巖兩種巖性的喀斯特環境，對其元素地球化學特徵及其中原生性植物群落的相異性和物種多樣性進行了對比，結果發現：不同巖性區域多樣性：喬木層和灌木層為純灰巖區純白雲巖區，草本層為純白雲巖區純灰巖區，總體上純灰巖區的高於純白雲巖區的；各樣地間的相似性系數都很低，相同巖性類型內的明顯高於不同巖性類型之間的相似度；物種周轉率高，且白雲巖區高於石灰巖區，種類組成差異明顯；喀斯特區可溶巖地球化學背景通過喀斯特作用導致特殊的地形條件與元素地球化學特徵，並引起局部小生境的分異從而影響植物群落特徵。
  13. 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。
  14. The structural diversity of elaeagnus mollis communities was studied by using both extended shannon - weaver index and stvi ( structure index based on variance ). the result from the both indices showed similar change tends

    採用擴展了的shannon - weaver指數和stvi指數對翅果油樹群落進行結構多樣性研究，兩個指數表現出較一致的變化趨勢。
  15. The diversity indices varied greatly in different strata at the earlier stages of succession and became more similar to each other at later stages of succession and the communities tended to be relatively stable

    演替前期，各層物種多樣性指數分異較大，演替後期，各層物種多樣性指數分異較小，群落趨于相對穩定。
  16. Twinspan, dca and diversity indices can be used in street grassland type analysis and the results accord with the fact

    Twinspan和dca以及多樣性指數可以運用於街道綠地類別的分析，結果與實際情況比較符合。
  17. The order of street grassland type diversity indices from higher to lower is : lawn street type > footway tree street type > pavement grassland street type > tree ( planted in pavement and mid - street border ) street type > tree in mid - street border street type > color grassland in street pavement street type color grassland ( planted in pavement and mid - street border ) street type > lawn in mid - street border street type.

    按街道綠地類別多樣性指數從小到大排列的8個街道類型依次為：草坪街道類型、行道樹街道類型、便道街道類型、喬木（便道+路心池）街道類型、路心池喬木類型、便道色塊類型、色塊（便道+路心池）街道類型、路心池草坪街道類型。
  18. The changes of the length and the width of streets are reflected by the first axis of the two - dimensional ordination diagram of dca and the changes of the human disturbance and habitat types by the other one. using diversity indices, the analysis shows mat human disturbances and habitat types are influential factors for the street grassland type diversity

    第一軸表示道路寬度和長度變化；第二軸反映綠地類別從路心池綠地類別向便道綠地類別變化以及生境由車輛干擾向行人干擾變化採用豐富度指數、多樣性指數和均勻度指數對城區街道植被的街道綠地類別多樣性的分析結果表明：街道綠地類別多樣性受到行人干擾、城區生境類型等因素不同程度的影響。
  19. We used several kinds of indices of diversity and the result shows highest diversity in summer community of maoxian ecological station and lowest diversity in autumn community of shilixiang and highest evenness in autumn community of shangkakagou

    最後，應用經典的多樣性指數、均勻度指數、種-多度模型對岷江上游典型退化生態系統的鳥類物種多樣性進行了研究。
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