Microhabitat variety shows significant effects on plant morphological performances. To understand adaptation strategy of alpine species to resources heterogeneity, response of biomass allocation and morphological characteristics to nutrient and light heterogeneity were studied for three component species (Saussurea macrota, Salvia przewalskii and Senecio scandens) in alpine meadow of the Qinghai-Tibetan Plateau.

為了解高寒植物幼苗對生境資源異質(zhì)性的適應(yīng)策略吹潮视频在线播放，以高寒草甸中常見的3種草本植物大耳葉風(fēng)毛菊一级毛片,黄,免费观看、甘西鼠尾草和千里光為材料性欧美13处交A片，比較研究了這3種植物幼苗對不同光照和養(yǎng)分資源的響應(yīng)有色视频永久无码。

The carbon isotope composition of single alkanes (δ13Cia) in two plants (Leontopodium leontopodioidies and Taraxacum mongolicum ) growing in the northeastern Qinghai-Tibet plateau was analyzed by means of GC-IMS in order to know its relationship with altitude,and furthemore, to gain new data for the research on climatic changes.

用色譜—同位素質(zhì)譜儀對青藏高原東北部高寒草甸生態(tài)系統(tǒng)中的兩種高等植物—火絨草和蒲公英的烷烴進行分析黄色伊人，討論環(huán)境因素對植物單體烷烴碳同位素組成（δ13Cia）的影響免费xx视频。

The result indicated that: with the change of ecological factors and intensification of human activities,strong stability of grassland community structure of the local alpine meadow type along the highway in this region was found,proportion of medium xerophilous、rhizomous grass increased;alpine grassland community had relatively low stability,grassland community successed naturally to adapt to the new environment;...

結(jié)果顯示：隨著生態(tài)因子發(fā)生變化和人類活動的加劇成品直播大全免费观看网站下载，該區(qū)公路沿線高寒草甸類草地群落結(jié)構(gòu)表現(xiàn)出了較強的穩(wěn)定性中国黄色录像一级A片，中旱生耐旱的根莖型禾草比重有所增加；高寒草原植物群落穩(wěn)定性相對較差XXⅩ性欧美视频，草地群落為適應(yīng)新的生境而發(fā)生了自然演替久久一级免费全裸视频；沼澤化草甸亞類草地植物群落中群落伴生種的種類增加，優(yōu)勢種嵩草屬植物在群落中的比重有所下降成人资源网亚洲电影在线观看网站。

Sympegma regelii community, a rangeland desert vegetation, has the highest Shannon-Winner species diversity indices (1.706); the communities of Haloxylon ammodendron and Ephedra przewalskii, which have obvious feature of desert vegetation, are in the middle in species diversity indices (0.875-0.890); the communities of Calligonum mongolicum, Populus euphratica, Tamarix ramosissima and Glycyrrhiza inflata, characterized by desert forest of which saline desert bushes and saline meadows are scattered in the communities, have lowest value of the species diversity indices (0.079-0.495). 3 The structure of desert plant community is dominated by the bush layer. The species diversity indices of bush layer (0.769-1.451) is much higher than that of herb layer (0.193-0.254), and the diversity in herb layer is strongly influenced by bush layer. 4 The species diversity of desert plant communities shows a gradient of change with respect to longitude, latitude and elevation. For example, rangeland plant Sympegma regelii, with a high level of diversity indices (1.706), is in transition to desert plants Haloxylon ammodendronn community (with a low level of diversity indices of 1.379) in a longitude gradient and to saline Tamarix ramosessima community (with a low level of diversity indices of 0.376) in a latitude gradient. Calligonum mongolicum community, with a low level of species diversity (0.819), is in transition to Ephedra przewalskii (with a low level of diversity indices of 0.890) and Haloxylon ammondendron community (with the diversity indices of 0.645) in an elevational gradient.

群落Shannon-Wiener物種多樣性水平表現(xiàn)為合頭草群落最高(1.706)人人插一区二区，具有草原化荒漠植被類型的成分；梭梭群落欧美屁股眼子XXXXX视频、膜果麻黃群落居中(0.875~0.890)久草性爱，荒漠植被類型特征明顯；沙拐棗群落国产免费女视频在线观看、胡楊群落十八大禁黄网、多枝檉柳群落、脹果甘草群落較低(0.079~0.495)国产专区一，荒漠林人人干摸操日、鹽地沙生灌叢及鹽化草甸植被均有零星分布。3荒漠植物群落結(jié)構(gòu)層次中五月丁香六月婷综合综合久久，灌木層占居主導(dǎo)地位官方网站夫妻一级黄色录像片子，群落灌木層物種多樣性水平(0.769~1.451)遠遠大于草本層(0.193~0.254)，且草本層物種多樣性受灌木層影響較大黄色视频最新入口地址。4荒漠植物群落物種多樣性分布格局表現(xiàn)為經(jīng)向黄色超碰在线、緯向和海拔梯度的變化，經(jīng)向亚洲第一综合、緯向變化為物種多樣性水平較高的草原化植物合頭草群落(1.076)向物種多樣性水平較低的荒漠植物梭梭群落(1.379)和鹽化植物多枝檉柳群落(0.376)的過渡黄色性爱网址，海拔梯度則呈現(xiàn)低水平的沙拐棗群落(0.819)到高水平的膜果麻黃群落(0.890)向低水平的梭梭群落(0.645)變化。

With the deflected succession of aquatic ecotype plant functional group,the dominance of mesophytes and xerophytes increased,while the dominance of aquatic and hygric plants decreased. However,there are only planting crops in the reclaimed wetland. In the composition of plant biotype functional group,the hydrophytes reduced quickly with the deflected succession and the dominance of perennial herbs is mostly marked,and there are only annual herbs in reclaimed wetland. Compared with primary swamp,the species diversity index of meadow is the highest,the swampy meadow follows,and the reclaimed wetland is the lowest.

植物的水分生態(tài)型功能群組成隨濕地的逆行演替国产精品99ri，水生91精品视頻在线、濕生類植物功能群的優(yōu)勢度不斷減少，中生操毛屄A片视频、旱生類植物功能群的優(yōu)勢度逐步增加亚洲一级二级黄片a国，而在墾后濕地只有農(nóng)作物毛片大全視頻看看吧；植物生活型功能群組成隨濕地的逆行演替，水生草本迅速減少色五月天小说，陸生多年生草本增加占據(jù)優(yōu)勢91精品国产肉丝高跟在线，而在墾后濕地均為一年生草本；濕地植物物種豐富度一级做全人爱国产乱伦视频、多樣性指數(shù)由原生沼澤www嗯啊、沼澤化草甸到草甸依次增加，草甸為最大值被干视频，而墾后濕地則最低超爽超舒服黄色一级A片视频。

This results indicated that peashrub shrubland created a favorable N condition for its invading the meadow and being invaded by birch forest, and played a important role in altering the successional direction of meadow→peashrub shrub land →birch forest.

盡管箭葉錦雞兒灌叢植物葉片與凋落物中全N、全P濃度在大多數(shù)取樣點上都低于碩樺99热只有这里最精品，但表層土中全N濃度高于碩樺和草甸厕所盗摄在线一区二区，且其土壤有機質(zhì)的供氮能力以及維持氮素能力都高于碩樺林和草甸，表明图片区激情小说，錦雞兒灌叢為侵入草甸和碩樺入侵提供了良好的養(yǎng)分條件国产美国AV中文字幕，在該演替序列的發(fā)展過程中起了一定的推動作用。

This paper concerns the analyses of niche breadths of and overlaps bet-ween several plant species in 3 Kobresia communities in the Haibei Research Station using the formula described by Levins and Pianka.

本文利用Levins和Pianka公式免费看50岁女人黄色片，在多維生態(tài)因子梯度上測定了海北地區(qū)高寒草甸三種嵩草群落中若干植物種的生態(tài)位寬度和生態(tài)位重疊亚洲性爱视频久久。