tree population 中文意思是什麼

tree population 解釋
樹木群落
  • tree : n 特里〈姓氏〉。n 1 樹〈主要指喬木，也可指較大的灌木〉。 ★玫瑰可以稱為 bush 也可以稱為 tree 2 木...
  • population : n. 1. 人口；人口總數；全體居民；人口的聚居。2. 物的全體[總數]；【生物學】蟲口；種群（量）；群體；族，組，個數；【統計學】對象總體，全域。3. 【物理學】布居；密度。4. 〈罕用語〉殖民。
  1. 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徵，包括南方紅豆杉種群年齡結構、種群空間格局（探討分佈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。
  2. 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徵的研究高度更宜於南方紅豆杉種群的生長。
  3. 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佈，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佈，表明它在自然群落中分佈的概率很小，反映了南方紅豆杉珍稀瀕危的生態生物學特性和特徵。
  4. Based on the field investigations and laboratory examinations, a study of the population of the epiphytic dolichomitriopsis diversformis ( mitt. ) nog. in fanjing mountain reveals that its habitats are different among different host trees, but that there lies the common habitat characteristics of not more than 2m height from the bottoms of host trees trunks, less light, high relative humidity, slow wind speed, slow evaporation speed and long time of remaining humid in middle - lower tree bark ; that it is one dioecious moss species, the morphology is remarkably different between its perichaetium and perigonium, the number of its perichaetia is much more than that of its perigonia, its perigonium is difficult to find out, its sporophyte is upright, its seta is long and thin, its capsule is regular long oval and its calyptra is cucullate

    摘要通過野外調查和室內觀測對貴州省梵凈山樹附生尖葉擬船葉蘚種群的研究表明，其生境因其所附生的樹種不同而有所不同，但具有共同特點：附生在樹干下部距地面2m高的范圍之內，光照弱、濕度大、風速小、蒸發量小、中下部樹皮保持濕潤的持續時間長；其為雌雄異株蘚種，雌、雄器苞形態差異明顯，雌器苞數量多，雄器苞數量少並且難于發現，孢子體直立，蒴柄細長，孢蒴規則長卵形，蒴帽兜形。
  5. Chapters 2－5 are devoted to the basic concepts of mendelian and population genetics which are of greatest concern in tree improvement.

    第二到第五章介紹對于改良樹木有密切關系的門德爾和群體遺傳學的基本概念。
  6. The thesis is based on income question, forest coverage rate and grop production. to beging with, date envelopment analysis is proved that it can be applicated into grain for green in shan - bei district, and then in view of the fact, seven esential factors which have influence on the project are found out : expense of dam, expense of crop, expense of cash tree, expense of defense tree, other economic crop, expense of grass and graziery ; and the output factors include : income of gdp, pure income per captia, the area of decreasing land loss, graziery income, crop production, income of tree, the totle income of economic crop. after the date of each facts are puted into dea model, unefficiencial decision making units ( dmu ) found. the data that are got through adjusting unefficiencial dmus dy dea can offer guide in shanbei district upgrading of an industrial structure. at the same time, taking into account some possible problems in or after grain for green in shan - bei district, the thesis bring out some propesal to improve the circ umstance, enhance the life level and put the relation of population, resource and circumstance into a healthy orbit

    因此，加快退耕還林還草，調整土地利用結構和產業結構，已成為實現山川秀美工程和可持續發展戰略的必經之路。論文以解決陜北地區的收入問題，植被問題以及糧食產量問題為出發點，首先從理論上分析了包絡分析方法在陜北地區退耕還林（草）中運用的可行性，然後結合陜北地區目前的實際情況，綜合分析出影響陜北地區退耕還林（草）的關鍵的七個因素作為輸入指標：水利水保設施投入，農作物投入，經濟林種支出，防護林支出，其它經濟作物，草類支出，畜牧業投入；以退耕還林所要解決的最終問題作為輸出指標： gdp收入、農民人均純收入、水土流失減少量、牧業總產值、糧食產量、林業總產值、其他經濟作物總產值。將各指標所對應的數據代入模型后，通過分析求解得出非有效的決策單元，再運用包絡分析方法的一些基本原理對非有效的決策單元進行調整，由此所得的數據對陜北地區的實際投入具有很好的指導意義。
  7. Based on the predecessor ' s research achievement, more sources have been cited, and explore systematically those aspects relating to imperial clan of song dynasty, such as administrative organs, genealogical tree edit, right in law, education, election, examination, appointment and other system, and i also make the analysis statistically of the population, the number of jinshi, of local administrations and other important aspects

    本論文在前人研究成果基礎上，資料利用上有所拓寬，系統考察了與宋朝宗室密切相關的管理機關、譜牒編修、法律權利、教育、選試應舉、任官等各項制度，並對宗室人口、宗室進士人數、宗室擔任地方官等重要方面作了數量上的分析。
  8. Based pheromone ' s research achievement, i had broadened more documents, and investigated systematically to those aspects who were related to imperial clan of song dynasty, for example : administrative organs, genealogical tree edit, right in law, education, election, examination, appointment and other rules and regulations, and i had also did statistics and analysis the population, the number of jinshi, of local administrations and other important profiles

    本論文在前人研究成果基礎上，資料利用上有所拓寬，系統考察了與宋朝宗室密切相關的管理機關、譜牒編修、法律權利、教育、選試應舉、任官等各項制度，並對宗室人口、宗室進士人數、宗室擔任地方官等重要方面作了數量上的分析。
  9. We choose the forest appearance tidiness, representative stands serving as standard plots, 40 stands were set up at qinling, hanzhong, huanghong in shaanxi respectively, measure every tree in the stands, measure the actual increase by the dominance tree, the time series model of individual age and diameter of quercus variabilis was established according to the actual diameter of quercus variabilis population by the fluctuant time series, the comparison of simulation and reality value of the every stand of quercus variabilis population diameter increase through the four models, the average simulation difference within 1. 5 %, the accuracy is 97. 8 % the simulation effect is better

    在陜西的秦嶺、漢中、黃龍地區選擇林相整齊、有代表性的地段作為標準地，設置樣方40個，對各樣方內的林木進行每木檢尺，通過優勢木解析的方法，測得栓皮櫟種群胸徑的實際生長量，運用起伏型時間序列分析，建立了栓皮櫟種群個體年齡與胸徑生長的時間序列模型，四個模型所得的各個樣地栓皮櫟胸徑生長的模擬值與實際值進行比較，其模擬平均誤差都在1 . 5 %以內，平均精度達到97 . 8 % ，模擬效果較好。
  10. Taxus chinensis var. mairei population in form. taxus chinensis var. mairei community using six aggregate indices ( c, i, i m, pai, ca, ), then analyze the causes of evolved pattern. the results indicated that the distribution pattern of seedling were all clumped in every plot, however, the distribution patterns of sapling, media tree and mature tree were mostly random. the trend of diffuse of form

    ）回歸分析法研究了南方紅豆杉林中南方紅豆杉幼苗、幼樹、中齡樹和成樹的分佈格局及動態，並分析格局形成原因，結果表明，各樣地南方紅豆杉種群幼苗均成聚集分佈，幼樹的分佈格局偏向于隨機分佈，而中齡樹與成樹則為隨機分佈，從幼苗到成樹，隨機擴散的趨勢十分明顯。
  11. Elevation, features of slope, vegetation, tree and shrub coverage, height, panda traces ( droppings, dens, individuals, gnawing bamboo stems ) in each plot were recorded to characterize the population size of the giant panda, their habitats and impacts of human disturbance on pandas at wanglang

    種群數量估計中，以每塊糞便中bsf的平均長度作為它的bsf平均長度，採用多重比較和相似系數方法對bsf平均長度進行分析和比較，識別糞便是來自同一個體還是不同個體，從而估計保護區的大熊貓種群數量。
  12. The seeding accounted for 91. 48 % of total number, and the mature tree of h : 5 ~ 7m class for 227 % whose density was just next to the seeding class. the results of intraspecific and interspecific competion formed the different individual height of taxus chinensis var. mairei population. the fractal dimension of taxus chinensis vsr. mairei were calculated on three indices : crown breath, base area, volume

    分析南方紅豆杉種群高度結構變化的原因認為，種間和種內對資源的競爭是引起其種群結梅粼七的主要原因，隨著高度增長，物種間不唯琳內對生存空間的競爭加劇，形成南方紅豆杉種群世代不同大， j 、個體的高度結構。
  13. Study on population dynamics of chinese fir and its associated tree species in natural chinese fir - and - broad - leaved mixed forest in northwest fujian

    閩西北天然杉闊混交林杉木及其伴生樹種種群動態研究
  14. This text expatiates the foundation top of the safe concept in population in the synopsis, measure to the population safety the evaluation index sign system set up and its deal turns, writer according to total leading thought that sets up the basis and the establishment of the principle, measure the evaluation system construction frame establishes, can operate the choice of the index sign, use the tree form diagram come out the index sign system manifestation, proceed the logic way of thinking that deal turn one by one to the index sign value, set up a set of systems completely, chien is clear, science, viable population safety measures the evaluation index sign system and its deals turn the early - warning standard, aiming at for research with establish the " 11 " population the development the strategy and should talk about of follow - up thorough research the offering consults basis

    摘要本文在簡要闡述人口安全概念的基礎上，對人口安全測評指標體系的構建及其量化，筆者按照構建的總體指導思想與原則的確立、測評體系結構框架的設置、可操作指標的篩選並用樹狀圖把指標體系顯示出來和對入選指標逐一進行量化的邏輯思路，構建了一套系統全面、簡明、科學、可行的人口安全測評指標體系及其量化預警標準，旨在為研究和制定「十一五」人口發展戰略以及該論題的后續深入研究提供參考依據。
  15. Whereas our urban - tree population shares many common features with those of other cities, we do have our unique environmental constraints and development history. rather than borrowing directly from other evaluation schemes, an independent methodology has been designed to suit the local circumstances

    雖然我們市區的樹木擁有類似於其他地方城市樹木的特點，但礙于香港獨特的發展歷史和環境因素，與其直接采納他人的標準，倒不如設計一套更適合香港市區環境的方法。
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