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(dòng)的加劇，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(qiáng)的穩(wěn)定性欧美日韩性爱成，中旱生耐旱的根莖型禾草比重有所增加插入美女嫩穴漫画；高寒草原植物群落穩(wěn)定性相對(duì)較差jjzz精品视频，草地群落為適應(yīng)新的生境而發(fā)生了自然演替；沼澤化草甸亞類草地植物群落中群落伴生種的種類增加免费操视频在线，優(yōu)勢(shì)種嵩草屬植物在群落中的比重有所下降av日韩无码爱爱。

These suggested that Armeniaca mandshuria belonged to thin-leaf xerophyte.

并認(rèn)為東北杏屬薄葉型旱生植物。

The characteristics of ecological type and life form of plants in Artemisia ordosica community are the higher proportion of hemicryptophyte and vivacious herbage and the important role of xerophyte and psammophyte in the communities.

油蒿群落植物的生態(tài)-生活型特征明顯免费www你懂的网站视频，如地面芽植物最多中国野外一级视频片；多年生草本植物所占的比重最大；旱生植物占重要地位：沙生植物占優(yōu)勢(shì)等自拍欧美日韩制服视频。

The single-celled phytoplankton included 116 inshore wide distribution species, 31 inshore warm-water species and 26 inshore temperate species, and the vascular plants were of 6 ecological groups, i.e., halophtes (24 species), hydrophtes (22 species), amphiphytes (35 species ), mesopllytes (103 species), zerophytes (6 species), and psammons (4 species). Halophtes, hydrophtes, and amphiphytes were the edificators and dominants, reflecting the azonal feature of the wetland vegetations. The vascular plants were divided into 5 life-forms, including 20 phaenerophytes, 4 chamaephytes, 54 hemicryptophytes, 48 geophytes and 68 therophytes, among which, hemicryptophytes and geophytes accounted for 52.58%, reflecting the relatively important function of cold and wet climate and local water-accumulated bottomland environment on the vascular flora formation.

區(qū)系中的單細(xì)胞浮游藻類包括近岸廣布種116種国产一级黄色视频免费看、近岸暖水種31種、近岸溫帶種26種一级一片免费观看；維管束植物被劃分為6大生態(tài)類群成年人的福利，包括鹽生植物24種、水生植物22種欧美十日韩十国产、濕生植物35種、中生植物103種1级黄色免费片、旱生植物6種99这里只有精品首页、沙生植物4種，保護(hù)區(qū)內(nèi)濕地植被的建群種性直播在线看黄网站、優(yōu)勢(shì)種均為水生植物青草视频在线播放精品无码、濕生植物或鹽生植物，反映了濕地植被的隱域性在线观看国产；維管束植物按照生活型劃分91人妻教师超碰，有20種高位芽植物、4種地上芽植物国产拍在线视频、54種地面芽植物1024手机看片你懂的无毒不卡、48種地下芽植物和68種1年生植物，其中地面芽植物美女久久黄色的网站、地下芽植物占區(qū)系植物總種數(shù)的比例較高国产线观看A片免费看一及，占52.58%，反映冷濕氣候和局部低洼積水環(huán)境對(duì)區(qū)系的形成起較重要作用国产91免费资源在线观看手机。

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亚洲精品一二三区，水生、濕生類植物功能群的優(yōu)勢(shì)度不斷減少影音先锋影院精品资源站，中生肏屄毛片免费看、旱生類植物功能群的優(yōu)勢(shì)度逐步增加，而在墾后濕地只有農(nóng)作物；植物生活型功能群組成隨濕地的逆行演替性爱一级高清无码视频，水生草本迅速減少卡通伦欧美有码亚洲，陸生多年生草本增加占據(jù)優(yōu)勢(shì)，而在墾后濕地均為一年生草本免费视频日韩；濕地植物物種豐富度人人摸人人人人操人人、多樣性指數(shù)由原生沼澤、沼澤化草甸到草甸依次增加国产丰满熟女视频，草甸為最大值A片黄片视頻，而墾后濕地則最低。

Flooding,as a kind of disturbance events,occurred with higher and higherfrequency over the world.To investigate the effects of flooding disturbance ongrassland vegetation and the soil,a comparatively thorough study was conducted onAneurolepidium chinense grassland in Songnen plain,Northeast China.The studysite was located in Sanjiadian National Rangeland in the territory of Da'an city,Jilirprovince,which was partly flooded in 1998.On the study site,Several transectssubjected to different flooding durations and intensities were designed for thecomparative study among them on such aspects as vegetation characteristics,seedbanks,vegetative propagation of rhizomatous plants,distribution patterns ofpopulations,interspecific relations,and physio-chemical properties of soil.Theresults were as follows:(1)Of the functional group composition of the vegetation,with the elongation of the flooding duration or the increase of flooding severity,theratio of hygric and hygro-mesic plants increase,while that of mesic and mesoxericplants decrease,of Therophytes changed unimodally,of Geophytes increased,whileof Hemicryptophytes decreased.

為弄清草地植被及其土壤環(huán)境對(duì)水淹干擾的響應(yīng)国产乱人伦精品一区二区三区，在松嫩平原羊草草地1998年部分遭受水淹的吉林省大安市三家甸子草場(chǎng)內(nèi)設(shè)置了經(jīng)歷不同水淹干擾持續(xù)時(shí)間和不同水淹強(qiáng)度的樣帶色悠久久久综合网，并在這些樣帶之間從植被特征、種子庫特征影音先锋777xfplay色资源网站、根莖植物的營養(yǎng)繁殖性能免费人妻98、種群分布格局、種間關(guān)系及土壤的理化性質(zhì)等多個(gè)方面展開對(duì)比研究淫淫黄色一片，主要結(jié)果如下：(1)在植被的功能群組成中欧美高清国产在线有码，隨干擾強(qiáng)度的增加和水淹干擾持續(xù)時(shí)間的延長，濕生色色色色色色色亚洲、濕中生類植物功能群的優(yōu)勢(shì)度比例基本上是逐漸增加的中文自拍日韩在线视频观看网站，中生、中旱生類植物功能群的優(yōu)勢(shì)度比例則逐漸減小免费看国产片黄色网站，而一年生植物的優(yōu)勢(shì)度比例呈單峰型變化欧美性爱调教美女视频播放三区，地下芽植物比例增加，地面芽植物比例減小又粗又长又刺激黄色网站。

Result:The stomatic density and characteristic of leaf epidermis and stem epidermis in six Ephedra species was differenc,there were no ob...

結(jié)果：6種麻黃屬植物之間氣孔密度AAAA一,黄片、莖、葉表面特征存在不同程度的差異婷婷五月天开心激情网；氣孔表現(xiàn)出典型旱生植物的特征中国一级大黄片强奸与乱伦，略下陷，氣孔保衛(wèi)細(xì)胞被厚的角質(zhì)層覆蓋中文字幕日韩精品人妻在线视频，并形成突起狀角質(zhì)唇狀物A片黄片视频在线免费观看；氣孔大小、形狀在種之間無明顯區(qū)別日韩在线专区；葉表面亚洲av无码无线在线观看、莖表面氣孔均屬于無規(guī)則型，但形狀明顯不同国产熟视频在线，前者主要呈長方形或六邊形成年无码Av动漫网站黄，后者為窄條形或啞鈴形。

The comparative research results showed that:(1)Thediurnal variation of the net photosynthetic rates in the aquatic leaves was a "double-peak", with an various "midday-decline", the time of the peak value appeared at about 10:00 A.M. and 13:00 P.M., while that in the xeric leaves was showed with invarious peak value and "midday-decline"; The diurnalvariation of transpiration ratesof both aquatic and xeric leaves appeared as a single-peak, the appearance time of peak value of the latter was earlier than the former and gradually decreased in the afternoon; The stomatal conductances appearance time of both of them were close to that of photosynthesisrate ,reached to the maximum in the morning and then gradually decreased: Diurnal variation of intercellular CO2 concentrationshows that: both aquatic and xeric leaves increased at first, and then exhibit a tendency of ascending within narrow range.(2) The net photosynthetic rates, photosyntheticallyactive radiation, stomatal conductances and transpiration ratesof both two kinds of leaves showed positive correlation, The correlation degree among them was prominent, there was significant negative correlation between The net photosynthetic rates and intercellular CO2 concentration.

研究結(jié)果表明：(1)水生葉片凈光合速率的日變化曲線呈雙峰型，出現(xiàn)明顯的&午休&現(xiàn)象国产AV无码中文，峰值出現(xiàn)在10：00左右和13：00左右国产精品一级二级，但旱生葉片表現(xiàn)出的峰型和&午休&現(xiàn)象不明顯；兩種葉片的蒸騰速率日變化曲線表現(xiàn)為明顯的單峰型亚洲无码精选，旱生葉峰值出現(xiàn)時(shí)間早于水生葉色色色色色综合视频，中午過后逐漸下降；兩種葉片氣孔導(dǎo)度峰值出現(xiàn)時(shí)間和光合速率相近尤物成人最新电影在线观看免费网站，均表現(xiàn)為上午升高至最高免费观看黄色视频的网址，隨后逐漸下降的趨勢(shì)；兩種葉片胞間二氧化碳濃度日變化表現(xiàn)為：整體上先下降西西WWW大胆高清视频，然后有一上升趨勢(shì)：(2)兩種葉片的光合速率與光合有效輻射www.中文字幕在线播放、氣孔導(dǎo)度、蒸騰速率呈正相關(guān)日韩精品欧美精品国产精品，全部達(dá)到顯著水平一级香蕉黄片；光合速率與胞間CO2濃度顯著負(fù)相關(guān)。

Xeromorphic structure reflected tree top leaves with stronger adaptability to water stress,and suggested that they were under water stress condition.

上部葉片趨于旱生型的形態(tài)解剖結(jié)構(gòu)特征反映出了其在結(jié)構(gòu)上具有較強(qiáng)的適應(yīng)水分脅迫的能力扒开双腿疯狂进出爽爽爽网站，證實(shí)其遭受了水分脅迫久久精品国产99精品最新按摸。

It proves that tree top leaves suffer from water stress and hydraulic limitation becomes greater with tree height.Water stress influence tree height growth in several aspects:firstly is the influence of exterior water condition,and community average tree height is positive with exterior water condition.Secondly, hydraulic limitation influences individual tree structure and function.Xeromorphic structure,Lower water potential and turgor pressure limit cell division and expansion,which restrict gas exchange and carbon assimilation capability.However,respiration consumption increases with the spread of tree crown.Shortage of nutrient limits carbon investigation on new leave growth and may ultimately limit tree growth.Thus,the main limitation of tree height is water.

水分對(duì)樹高生長的限制首先是外在的水分狀況，群落的總體高度隨外界水分狀況的變差而變矮激情另类无码；再就是水力限制對(duì)單株樹木的結(jié)構(gòu)和功能的影響人人鲁人人尻，水勢(shì)降低、膨壓減小使細(xì)胞的分裂和擴(kuò)展受限免费福利视频黄色网站，旱生型結(jié)構(gòu)加劇水力對(duì)氣體交換能力的限制、使光合碳同化能力受到限制国产aaaaaaaa一级、而呼吸消耗卻隨著樹木個(gè)體的增大而增大1024在线看片你懂的，制造營養(yǎng)物質(zhì)不足、使得營養(yǎng)虧缺免费观看视频精品免费观看、造成投入新枝葉的營養(yǎng)受限亚洲一区二区三区a片，最終限制了樹高繼續(xù)增長。

Cycas revolute：蘇鐵

常見的蘇鐵(Cycas revolute)作為觀賞植物栽培;國產(chǎn)全部蘇鐵屬植物均為保護(hù)對(duì)象. 松柏植物(Coniferae) 包含了大多數(shù)的裸子植物,是地球南北溫帶大面積森林的主要樹種. 多為常綠喬木,單軸分枝,有長短枝之分:葉多為針形,或條形,氣孔旱生型,

xeromorphic：旱生型的

xenon stroke light 氙頻閃燈 | xeromorphic 旱生型的 | xylene 二甲苯

xeromorphy：旱生型

xeromorphism /旱生形態(tài)/ | xeromorphy /旱生型/ | xeromycteria /鼻干燥/

xerophytic leaves：干生葉

耐旱性的 xerophytic | 干生葉 xerophytic leaves | 旱生根著型 xero-radicantia