999精品在线视频,手机成人午夜在线视频,久久不卡国产精品无码,中日无码在线观看,成人av手机在线观看,日韩精品亚洲一区中文字幕,亚洲av无码人妻,四虎国产在线观看 ?

湖北竹溪十八里長峽自然保護區紅豆杉群落特征研究

2018-04-02 06:46:10周全史航江明喜張全發黨海山
湖北林業科技 2018年1期

周全 史航 江明喜 張全發 黨海山

摘 要: 分析十八里長峽自然保護區紅豆杉(Taxus chinensis)群落的外貌、群落物種組成及群落結構,旨在為恢復、保護和利用這一珍稀物種提供理論依據。在采用樣方法取樣的基礎上,對湖北竹溪十八里長峽自然保護區大型紅豆杉群落從其群落外貌、 群落物種組成和群落結構等方面進行了群落特征的調查與研究。結果表明:紅豆杉與米心水清岡(Fagus engleriana)形成了一個穩定的常綠落葉闊葉混交林群落,并且在群落中紅豆杉的重要值高達43.39,占有比較明顯優勢;而從相對優勢度來看,紅豆杉占5621%,也說明紅豆杉在群落中占有重要地位;從紅豆杉種群垂直結構來看,紅豆杉為群落中優勢樹種;從紅豆杉種群徑級結構來看,紅豆杉各級木齊全,且種源充足,自然更新良好,屬穩定種群;從群落種類組成上來看,群落中古老成分的植物特別多,如紅豆杉、鵝耳櫪(Carpinus turczaninowii)、槭樹(Acer oliverianum、A.caudatum)、領春木(Euptelea pleiospermum)等均為第三紀遺留下來的植物。反映了十八里長峽自然保護區紅豆杉群落的古老性和原始性,其地勢險峻,人為破壞較少,土地肥沃,氣候適宜。這種得天獨厚的生態環境,適于紅豆杉的生長發育。

關鍵詞: 十八里長峽;紅豆杉;群落特征;徑級結構

中圖分類號:X36 文獻標識碼:A 文章編號:1004-3020(2018)01-0005-05

Study on the Community Characteristics of Taxus Chinensis

in Shibalichangxia Nature Reserve in Zhuxi, Hubei Province

Zhou Quan(1,2) Shi Hang(1,2) Jiang Mingxi(1,2) Zhang Quanfa(1,2) Dang Haishan(1,2)

(1.Wuhan Botanical Garden, the Chinese Academy of Sciences Wuhan 430074;2.University of Chinese Academy of Sciences Beijing 100049)

Abstract: The aim of this study is to analyze the appearance, community composition and community structure of the Taxus chinensis community in the Shibalichangxia Nature Reserve, and to provide a theoretical basis for the restoration, conservation and utilization of this rare species. Based on the methodology of quadrat samplings, the characteracteristics of the community physiognomy, species composition, and community structure of Taxus thenesis were studied in the Shibalichangxia Nature Reserve in Zhuxi of Hubei Province. The results are as the followings: (1) Taxus thinensis and Fagus engleriana constitute a stable evergreen and deciduous broad-leaved mixed forest, and the importance value of Taxus thinensis amounts to 43.39, indicating that it is a dominant species in the community. (2) The relative dominance of Taxus thinessis is 56.21%, indicating that Taxus chinensis plays an important role in the community. (3) Taxus chinensis is dominant species of the community according to the vertical structure of the community. (4) According to the Size-class distribution of Taxus chinensis, its individual occupies each age class, and the seedlings and saplings are sufficient, illuminating that its natural regeneration is normal and that the population is very stable. (5) There are a lot of ancient elements in the community of Taxus chinensis, such as Taxus chinensis, Carpinus turczaninowii, Acer oliverianum, Acer caudatum and Euptelea pleiospermum,which are relics of the Tertiary, demonstrating that the community of Taxus chinensis is ancient and primitive. Reflecting the ancient nature and primitive nature of the Shibalichangxia Nature Reserve, the terrain is steep, man-made less damage,fertile land, climate is appropriate. This unique ecological environment, suitable for the growth and development of Taxus chinensis, provide the basis for the conservation and utilization.

Key words: Shibalichangxia;Taxus Chinensis;community characteristics;size-class distribution

中國紅豆杉(Taxus chinensis)屬紅豆杉科紅豆杉屬的大喬木,是中國特有珍稀樹種。自70年代以來,由于發現在紅豆杉樹皮和枝葉中抗癌物質紫杉醇的含量較高,使該物種遭到了不合理的砍伐,其賴以生長的自然環境也受到了很大程度的破壞,再加上紅豆杉自身繁殖能力低,因此該物種目前已處于易危狀態。……

登錄APP查看全文

主站蜘蛛池模板: 三级视频中文字幕| 日韩经典精品无码一区二区| 激情网址在线观看| 婷婷成人综合| 免费福利视频网站| 国产精品熟女亚洲AV麻豆| 国产精品私拍在线爆乳| 视频一区视频二区中文精品| 亚洲水蜜桃久久综合网站| 精品免费在线视频| 永久天堂网Av| 国产亚洲成AⅤ人片在线观看| 精品自窥自偷在线看| 国产jizzjizz视频| 欧美精品一区在线看| 成AV人片一区二区三区久久| 亚洲一级毛片| 欧美成a人片在线观看| 国产女人18毛片水真多1| 亚洲精品爱草草视频在线| 国产素人在线| 欧美精品v欧洲精品| 日韩精品无码免费一区二区三区| 黄片一区二区三区| 92精品国产自产在线观看| 亚洲最新地址| 精品久久久久久成人AV| 免费人成在线观看成人片| 欧美日韩福利| 国产亚洲精品无码专| 中日韩一区二区三区中文免费视频| 亚洲91精品视频| 亚洲精品无码抽插日韩| 精品久久久久久久久久久| 精品剧情v国产在线观看| 中文无码精品a∨在线观看| 18禁影院亚洲专区| 午夜综合网| 成人午夜亚洲影视在线观看| 亚洲欧美日韩另类| 亚洲Av激情网五月天| 亚洲黄色片免费看| 91香蕉视频下载网站| 国产女主播一区| 亚洲综合专区| 在线色综合| 亚洲国产一成久久精品国产成人综合| 久久久久久久久亚洲精品| 亚洲香蕉久久| 亚洲码在线中文在线观看| 亚洲一区波多野结衣二区三区| 久久毛片网| 人人91人人澡人人妻人人爽| 亚洲一区无码在线| 亚洲成A人V欧美综合| 国产精品免费福利久久播放 | 中文字幕亚洲综久久2021| 天天激情综合| 亚洲成人黄色在线| 97青青青国产在线播放| 中日无码在线观看| 午夜福利视频一区| 九九香蕉视频| 久久婷婷色综合老司机| 永久在线精品免费视频观看| 999精品视频在线| 亚洲熟女偷拍| 国产成人精品18| 日本国产精品| 亚洲中文字幕在线一区播放| 欧美日韩中文国产| 亚洲一区第一页| 99国产在线视频| 久久综合丝袜日本网| 伊人久久精品无码麻豆精品| 国产乱子伦一区二区=| 无码'专区第一页| 亚洲午夜天堂| 亚洲成a人在线播放www| 在线亚洲精品福利网址导航| 福利国产微拍广场一区视频在线| 欧美高清视频一区二区三区|