pioneer species 中文意思是什麼
pioneer species
解釋
先鋒種-
The pioneer tree species for the sand and storm treatment and forestation in the drought regions of northern shanxi
晉北乾旱地區風沙治理造林的先鋒樹種 -
At the same time, this paper also describes the fluctuation of soil nutrients and the contrast between soil of leguminosae and non - vegetation covering. the results are as follows : 1 ) despite the mesophyte leaf form of the ten pioneer species there were significant differences in leaf anatomical characters among them and some differences among different plants of an individual
結果表明研究區喀斯特先鋒植物葉片在不同種類之間具有明顯差異，這些差異除受遺傳因子控制外，環境因子（主要為光照和水分）也有重要作用；生活型不同對先鋒植物葉片特徵有一定影響，但未表現出規律性。 -
In different phases of development, vegetation systems in this region have changed from pioneer herbage species initially recovering in abandoned cropping lands ( bothriochloa ischemum, artenmisia giradii and stipa bungeana, artenmisia sacrorum, spodiopogen sibiricus and sophora flavecens, themeda japonica, and arundinella anomala ) to secondary shrubs ( hippophae rhamnoides, sophora viciifdia, and ostryopsis davidiana ), early forest community ( populus davidiana, betula platyphylla and platycladus orientalis with arbors or shrub assembling ), and finally liaotungesis community as the mature forest. in this study, soil profiles ( 0 - 5, 5 - 15, 15 - 25, 25 - 35, 35 - 50 cm soil layers ) were selected from typical vegetation systems representing for vegetation successions in the region
該區北部目前還保存有空間上完整的植被正向演替系列，即棄耕地先鋒群落草本群落（白羊草bothriochloaischemum 、茭蒿artenmisiagiradii +長茅草stipabungeana 、鐵桿蒿artenmisiasacrorum 、大油芒spodiopogensibiricus +苦參sophoraflavecens 、黃菅草themedajaponica或野古草arundinellaanomala ）灌叢群落（沙棘hippophaerhamnoides 、狼牙刺sophoraviciifdia 、虎榛子ostryopsisdavidiana ）早期森林群落（喬灌群聚、山楊populusdavidiana 、白樺betulaplatyphylla 、側柏platycladusorientalis 、 ）遼東櫟群落（ quercusliaotungensis ） 。 -
Niche breadth of four dominate populations at three age groups was studied by the methods of resource utilization ability and ratio. the result shows that : symplocos sectchuanensis is a typical gengeration species whi ch resource utilization ability is strong, and distribution is wide. meanwhile, go rdonia acuminata, castanopsis fargesis and pinus massoniana specialized at some d egree in resource utilizationm, their distribution is limited. especially, the ju venile of pinus massoniana specialized outstandingly. with the devlopment of pinu s massoniana, which is the pioneer population in mt. jinyun, the environment become s unfit to it ' s juvenile. it turns to needle and evergreen broad - leaves mixed fo r est. because the tolerance toward shading of gordonia acuminata is lower than tha t of castanopsis fargesis, gordonia acuminata will be substituted by castanopsis fargesis and other evergreen broad - leaves species are the edificators. the popul ation ' s ability of resource utilization is the inner factor of population distri bution and community succession. the distribution of light and the concentrate of nutrient ( such as n ) is the outer factors of community succession
對縉雲山森林植被的4個優勢種群3個年齡級生態位寬度進行了研究.結果表明，川灰木利用資源的能力最強、分佈廣，為典型的泛化種.大頭茶、栲樹、馬尾松對資源的利用在一定程度上特化，分佈上有一定的局限性.馬尾松的中齡組與幼齡組特化現象十分顯著.縉雲山森林植被的先鋒種馬尾松的發展，導致環境的改變不適于其幼齡個體的生長，群落演替到針闊葉混交林階段，最後發展為以栲樹等為建群種的常綠闊葉林.種群的資源利用能力，是種群分佈與群落演替的內在原因，光因子和營養元素（如n ）是群落演替的主要外部動力 -
It is found particularly in pioneer weed species and in ecosystems such as the tundra, where insect vectors are rare
研究發現這種現象主要存在於某些先鋒植物物種和苔原生態系統中，因為那裡傳粉的昆蟲很少。 -
Tetraploid black locust is a variety has been bred in south korea, the leaves of which are 3 times larger than those of diploid varieties and contain 1. 4 times more protein. and it has no prickles on its surface. it can be used not only as pioneer species in environmental beautifying and ecological restoration, also as fodder, bee forage, timber production, and so on
四倍體刺槐是韓國培育出的刺槐新品種，屬無刺類型，其葉片大小為普通二倍體刺槐的4倍，蛋白質含量為1 . 4倍多，不但可以作為先鋒樹種廣泛應用於環境美化和生態建設中，還可作為飼料、蜜源和木材等不僅具有較好的生態效益，同時還具有很高的經濟價值。 -
Seed movement across the soil surface of these bare alkali - saline patches was abundant and dominated by the seeds of pioneer species, such as chloris virgata and suaeda corniculata, which accounted for over 96 % of these trapped seeds
土壤表面種子流數量巨大，且以一年生耐鹽鹼的先鋒植物（虎尾草和鹼蓬）種子為主，占總流量的96 % 。 -
When community developed to climax stage, however, the species diversity would decrease attributing to the disappearance of some pioneer species. in addition, species diversity of the shrub - tree ecotone would increase swingingly, due to the " bundary effects "
但當群落發展到成熟的頂級階段時，多樣性會隨著一些先鋒種的消失而有所下降；另外，林灌交替階段會因「邊緣效應」 ，物種多樣性大幅增加。
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