The forest was characterized with phanerophyte evergreen plants with single-mesophyll-leathery leaves, which reflected the nature of tropical Karst mountainous seasonal rain forest.(2). Community succession was divided into five stages by using Cluster method, PCA method; the succesion stages include herbaceous stage, scrub-shrub stage, small tree stage, arbor stage and climax seasonal rain forest stage.(3). Based on similarity theory, succession sere was constructed with the community similarity equation formed.

結(jié)果表明：(1)森林群落在外貌上一区二区三区黄片，以常綠高位芽大学生A级毛片免费视频、單葉、革質(zhì)巴西在线无码AA片、中型葉植物為主欧美草草操在线视频，反映了熱帶巖溶山地季雨林的特點(diǎn)；(2)運(yùn)用聚類(lèi)分析黄片一级片一区、PCA排序等方法將群落演替階段劃分為草本群落階段麻豆产视频在线观看、灌叢階段、小喬木階段成视频年人黄网站免费动漫、喬林階段欧美六九视频在线、頂極季雨林階段；(3)運(yùn)用相似學(xué)原理久青草视频，組建群落間相似度方程并以此方程構(gòu)建了群落演替系列caoporen在线精品视频；(4)研究表明桂西南巖溶區(qū)生態(tài)系統(tǒng)健康受到嚴(yán)重脅迫。

Based on the field investigation in Aug 2001 and Aug 2002, digital China Vegetation Map in 2001 and Qinghai-Xizang Plateau Vegetation Regionalization Map in 1996, vegetation characteristic along two sides of Qinghai-Xizang highway and railway is studied in this article Meanwhile, the impacts of Qinghai-Xizang highway and railway constructions on the ecosystems are analyzed using ARCVIEW四虎成人最新影院网址大全、ARC/INFO and PATCH ANALYSIS It was found that:(1) Qinghai-Xizang highway and railway span 9 altitudes,12 longitudes and 6 natural regions (East Qinghai and Qilian mountain steppe region, Chaidamu mountain desert region, South Qinghai alpine meadow steppe region, Qiangtang alpine steppe region, Guoluonaqu alpine scrub meadow region and South Xizang mountain shrub steppe region);(2) the constructions of Qinghai-Xizang highway and railway destroyed natural vegetation and landscape, especially in 50m-wide buffer regions along both sides of the roads, it was estimated that the Primary Productivity deceased by about 30504.62t/a and the gross biomass deceased by 432919.25～

：根據(jù)2001-08和2002-08月野外調(diào)查數(shù)據(jù)及2001年1∶100萬(wàn)中國(guó)植被圖99九色视频在线观看、1996年1∶400萬(wàn)青藏高原植被區(qū)劃圖和2000年青藏鐵路沿線(xiàn)自然保護(hù)區(qū)分布及功能區(qū)界調(diào)整圖，以青藏公路鐵路沿線(xiàn)植被生態(tài)系統(tǒng)為研究對(duì)象美女性爱网站，運(yùn)用ARCVIEW和ARC/INFO軟件研究青藏公路鐵路建設(shè)對(duì)沿線(xiàn)生態(tài)系統(tǒng)結(jié)構(gòu)的影響91av视频在线观看，結(jié)論如下：①青藏公路鐵路南北跨越9個(gè)緯度，東西跨越12個(gè)經(jīng)度亚洲国产黄片，共穿越青東祁連山地草原地帶自拍日韩视频首页在线视频、柴達(dá)木山地荒漠地帶、青南高寒草甸草原地帶这里视频亚洲视频免费观看,、羌塘高寒草原地帶激情网免费视频、果洛那曲高寒灌叢草甸地帶和藏南山地灌叢草原地帶6個(gè)自然區(qū)，對(duì)植被類(lèi)型的統(tǒng)計(jì)結(jié)果顯示了地帶性免费黄色xxxx视频。②青藏公路鐵路的建設(shè)對(duì)生態(tài)系統(tǒng)產(chǎn)生直接的切割日韩国产精品免费人成视频，使景觀更加破碎。

Three types of community of 5000m^2, where herbaceous scrub, shrub forest and evergreen broad-leaved forest were damaged by M. micrantha, were established in the Country Park of Hong Kong. The herbicide sulfometuron-methy concentration 0.05~0.1 gm^(-2 was tested to Kill M. micrantha. The effect of herbicide sulfometuron-metny killing M. micrantha and its influence on other plants and species diversity in communities were analyzed.

在香港郊野公園內(nèi)選擇薇甘菊危害較嚴(yán)重的草灌叢免费直接看黄、灌木林和常綠闊葉林3種群落類(lèi)型一级毛片av全部免费播放，設(shè)置樣地5000平方公尺，用0.05~0.1gm^(-2)嘧磺隆對(duì)樣地中的薇甘菊進(jìn)行化學(xué)防除試驗(yàn)男女搞黄视频，并在施用除草劑后3在线欧美精品第一页、5和14個(gè)月跟蹤調(diào)查施藥對(duì)薇甘菊的殺滅效果以及對(duì)樣地中其他植物和群落物種多樣性的影響。

The golden wattle is an evergreen, spreading shrub. It grows in the under storey of open forest, woodland and in open scrub.

金合歡是一種分布廣泛的常青灌木十八岁免费看黄色视频，生長(zhǎng)于疏林和叢林的底部以及灌木叢中在线视频一区二区三区。