evenness indices 中文意思是什麼
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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。 -
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。 -
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。 -
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。 -
Based on plant communities and plots investigation in jinfo mt. and experimental site in guilin, the author calculated the indices of every plot with its species richness index, simpson index, shannon - wiener index, pielou evenness index and alatalo evenness index. the author analyzed the character and variation of the biodiversity in different area and different layers about the plots in jinfo mt
1採用典型樣方法，在金佛山和桂林實驗場選取典型樣地並做野外調查，分別計算各樣地的物種豐富度指數、 simpson指數、 shannon - wiener指數、均勻度指數、 pielou均勻度指數、 alatalo均勻度指數，對金佛山不同地區樣地生物多樣性以及不同地區不同層次生物多樣性特徵和變化進行分析。 -
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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