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basal area

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basal area 底面積；基域。

底面積；基域。 “basal“ 中文翻譯：   adj. 1.基部的。 2.基礎的，基本的。 ...“area“ 中文翻譯：   n. 1.面積；平地；地面。 2.空地；〔英國〕地下室前 ...“average basal area“ 中文翻譯：   平均斷面積“basal anal area“ 中文翻譯：   基臀域“basal area age“ 中文翻譯：   胸高斷面年齡“basal area control“ 中文翻譯：   底面積控制“basal area of a stand“ 中文翻譯：   林分底面積“basal area of whole woods“ 中文翻譯：   全林底面積“basal area regulation“ 中文翻譯：   斷面積調節法“basal seat area“ 中文翻譯：   基座區,基托區,義齒基托,承受區,承托區“basal-area regulation“ 中文翻譯：   斷面積調節法“crop basal area“ 中文翻譯：   林作底面積“stand basal area“ 中文翻譯：   林分底面積“total basal area“ 中文翻譯：   總斷面積“basal“ 中文翻譯：   adj. 1.基部的。 2.基礎的，基本的。 the basal parts of a column 柱的底部。 n. 【地質學；地理學】基板。 “basal anesthesia basal narcosis“ 中文翻譯：   基礎麻醉“basal granule, basal body“ 中文翻譯：   基粒“anterior basal“ 中文翻譯：   前基底區“barium basal“ 中文翻譯：   基礎的“basal age“ 中文翻譯：   基礎年齡; 基準年齡“basal anesthesia“ 中文翻譯：   基礎麻醉“basal aperture“ 中文翻譯：   內緣孔“basal arkose“ 中文翻譯：   底部長石砂巖; 基底長石砂巖“basal articulation“ 中文翻譯：   基部關節“basal azygous“ 中文翻譯：   無偶底板

basal leaf

The method of modified simplex was applied to optimize the models , and the fitting results show that liu - logistic model was more suitable than logistic model to the actual growth trend of form . taxus chinensis var . mairei population , and the highest growth rate of basal area was the tenth age class , namely the phase when breast diameter was 68 ~ 76 cm 以胸高斷面積代替種群生物量，分別采用logistic常規模型及劉金福提出的logistic改進模型對南方紅豆杉種群的增長動態進行研究，運用改進單純形法對模型進行優化，擬合結果表明改進模型比logistic常規模型更符合南方紅豆杉種群的增長趨勢，南方紅豆杉種群的最大增長速度出現在第10齡級，即胸徑為68 76cm時期。

Yellow - green or yellow chlorosis or brown necrosis in basal areas of older and expanding leaves ; margins curled downwards and leaf expansion irregular and suppressed ; chlorosis and necrosis spreading into interveinal areas of older leaves ; youngest leaves distorted , necrotic and failing to expand ; petioles truncated ; death of stem growing point 西葫蘆缺硼:老葉和正展開葉的基部黃綠色或黃化或變褐壞死,邊緣向下卷曲和葉片展開不規則和抑制,色斑和壞死斑散布在老葉葉脈間,心葉扭歪、壞死、無法展開,莖生長點枯死

Taxus chinensis vsr . mairei population is very oblivious from seeding stage to mature tree stage . the patterns were consistant with the ecological and biological characteristics of form . taxus chinensis var . mairei which were valuable and rare and in severe danger . in this paper , logistic model and liu - logistic model were proposed to approach the growth dynamics of tree basal area of form . taxus chinensis var . mairei population 南方紅豆杉幼苗表現為較強的聚集分布，除與種子的散布有關外，生境條件的差異是重要原因之? ，其它發育階段表現為明顯的隨機分布，表明它在自然群落中分布的概率很小，反映了南方紅豆杉珍稀瀕危的生態生物學特性和特征。

The growth dynamics of tree basal area of form . taxus chinensis var . mairei population in different altitude were discussed using the liu - logistic model , and the results showed that the altutide of 790 meters is more suitable to the survive of form . toms chinensis var . mairei population than 990 meters . plot sampling was selected and dynamic analysis was used to study the height structure of taxus chinensis var . mairei population , and the quadrate picture of height structure and the curve of survival rate were drew 運用改進模型對南方紅豆杉種群在不同海拔梯度的種群優勢度增長進行了探討，表明海拔790m處的南方紅豆杉具有較大的環境容納量，但增長速度不快，海拔990m處的南方紅豆杉種群環境容納量不高，但具有較大的增長速度，這可能與群落的發育階段不同有關，兩地海拔均為南方紅豆杉適宜的生長海拔高度，相比而言，海拔790m的珍稀瀕危植物南方紅豆杉種群數量特征的研究高度更宜于南方紅豆杉種群的生長。

Form . taxus chinensis var . mairei is protecting plant in the first class , which is a precious and endangering plant in china in this paper , the quantitative characterics of form . taxus chinensis vsr . mairei population including age structure , spatial distribution pattern , growth dynamics of tree basal area , niche characterics , fractal dimension and competition between specises were studied using methods of mathematics ecology from the angle of population ecology of form . taxus chinensis var . mairei , then the prent state and the endangering causes were analysed . this research offers gist to protecting and enlarging the crude resourse of form . taxus chinensis vsr . mairei population , afforesting plantation and sustainable utilize for us 本文從南方紅豆杉種群生態學的角度、主要應用數學生態學的方法探討南方紅豆杉種群的數量特征，包括南方紅豆杉種群年齡結構、種群空間格局(探討分布格局動態規律與生境相互關系) 、不同立地條件下種群優勢度增長趨勢、生態位寬度、生態位相似比例、生態位重疊、空間占據能力及種間競爭等，分析其目前現狀及瀕危原因，期望為南方紅豆杉野生資源的保護和擴大、營造人工林及可持續利用提供理論基礎，也為瀕危植物種群生態學的研究提供參考。

Numerous small rounded dark brown or black necrotic patches in green leaves ; patches often in groups or rows close to midrib or major lateral veins , towards centre or basal areas of leaflects ; petioles green and healthy 缺錳的馬鈴薯葉片：葉片上有大量深褐色或黑色壞死小圓斑，葉的主脈或大部分側脈附近有條狀斑紋，向葉中部和基部擴散，葉柄正常并保持綠色。