crown density 中文意思是什麼

crown density 解釋
郁閉度。

  • crown : n 1 （勝利的）花冠；榮譽；〈美俚〉錦標。2 王冠，冕；王位；君權；〈the Crown〉 國王，君主。3 王冠...
  • density : n. 1. 稠密；濃厚。2. 【物理學】濃度；密度；比重。3. 愚鈍，昏庸。
  1. Quickly accurate determination method of forest land crown density based on arcview gis

    支持下的林地郁閉度的快速精確測定方法
  2. The results showed that plant height, crown breadth, leaf number, leaf breadth and sporophyll number of dryopteris crassirhizoma populations were influenced by forest crown density and light condition

    結果表明：林分郁閉度和光照條件顯著影響粗莖鱗毛蕨種群的株高、冠幅、葉片數量、葉片寬度、孢子葉數等形態指標。
  3. Russula subnigricans hongo grows fast after shower in the later summer and early autumn when it was hot. they emerged in the forest stand in which crown density was 0. 9 or so. soil ph was 5. 75, and fagaceae species dominated

    每年在夏末秋初高溫陣雨之後為發生盛期。發生地林間郁閉度0 . 9左右，土壤ph值5 . 75 ，其共生樹種以殼斗科為主。
  4. According to the law of different forest stand can arise different forest fire, based on the existing forest distribution at the badaling forestry center, the area percentage of different forest types, forest age, crown density and slope for each sub - compartment were analyzed, and based on the different characteristics of each sub - compartment, some rational methods of fire prevention were put forward

    摘要本論文基於不同的林分能引起不同的林火特性規律，針對北京八達嶺林場林分狀況，統計分析了各林班不同林分類型、林齡、郁閉度、坡度的面積分佈百分比，根據不同林班林分特點，提出了合理的營林防火措施。
  5. Mongolica young stand, secondary natural forest, and the mixed forest of larix olgensis and fraxinus mandshurica rupr. countermeasures for controlling soil degradation were also recommended. the study got following results : ( 1 ) from young stand to mid - age of larix olgensis, with the closure of canopy and the decrease of undergrowth vegetation cover, soil acidity, enzyme activity, total inorganic phosphorus, available k, soil moisture and total porosity decreased significantly ; while soil organic matter content, humus component content, the amount of three main types of microbes, acid phosphatase activity, and bulk density in rhizosphere soil and non - rhizosphere soil increased with the increase of the amount of forest floor litter ; from mid - age stand to near mature stand, with the decrease of stand density and crown cover as well as the restoration of undergrowth vegetation after preliminary thinning, soil organic matter content, fulvic acid, exchangeable acidity, exchangeable aluminium, neutral phosphatase activity, total amount of inorganic phosphorus, the amount of actinomycetes, soil moisture, and total porosity in rhizosphere soil and non - rhizosphere soil apparently increased ; from near matu re stand to mature stand, soil activity acidity, organic matter content, humus component content, available phosphorus, total amount of amino acid, available k, soil enzyme activity, soil moisture, and total porosity in rhizosphere soil and non - rhizosphere soil decreased, but total phosphorus, soil acidity ( in particular, exchangeable aluminium ), and bulk density increased

    結果表明： （ 1 ）從落葉松幼齡林到中齡林，隨著林冠的郁閉和林下植被蓋度的急劇下降，林地土壤酸度、土壤酶活性、無機磷總量、速效鉀、土壤水分含量、總孔隙度呈明顯下降趨勢，而根際和非根際土壤有機質含量、腐殖質各組分含量、三大類微生物數量、酸性磷酸酶活性和土壤容重隨著凋落物的增加呈明顯上升趨勢；從中齡林到近熟林，由於撫育間伐，林分密度及郁閉度下降，林下植被蓋度逐步得到恢復，根際與非根際土壤有機質含量、富里酸、交換性酸、交換性鋁、中性磷酸酶、無機磷總量、放線菌數量、土壤水分含量、總孔隙度呈明顯的上升趨勢；從近熟林到成熟林，隨著林齡的增大，根際與非根際土壤活性酸、有機質含量、腐殖質各組分含量、有效磷含量、氨基酸總量、速效鉀、土壤酶的活性、土壤水分含量和總孔隙度呈下降趨勢，而根際與非根際土壤全磷含量、土壤酸度（特別是交換性鋁）和容重呈增加趨勢。
  6. These plant - type characters of " yedan 12 " resulted in an improving crown - canopy structure which favoring conditions of aeration and solar penetration, so suitable enlargement of planting density would enable maize plants to extending their active photosynthetic area which promoted bigger ears with more kernels and then attained high yield of grains per plant

    掖單12這種株型特點改變了植冠構造，更有利於通氣條件和陽光透射，這樣適當增大植株密度將使玉米植株擴大活性光合作用面積，促成大穗、穗粒數更高，因此單株籽粒產量更高（表9 ） 。
  7. 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。
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