The main indictor examined were anatomical structrue ofleaves,movement and shedding of leaves,leaf water potential andwater saturation deficit,leaf succulence and specfic leaf area,rate of water loss,slope of water release curve.water parametersof PV curveψo(hù)、Vs黄色a,亚洲a、Va黄色高清无码视频、Emax and TW/DW et al.

在人工氣候室和溫室條件下，控制不同土壤水勢(shì)梯度日韩中文欧美在线，從苗木水分生理生態(tài)特點(diǎn)一级特黄AA级毛片免费看、耐旱生產(chǎn)力及存活能力等三個(gè)方面研究了1～3年生的油松、側(cè)柏91精品国产免费、栓皮櫟黑人三级片免费看、元寶楓、刺槐最新最近亚洲中文字幕、白蠟人人爽人人澡人人、紫穗槐、沙棘和黃櫨的耐旱特性及其機(jī)理精品毛片二区。

Any of various New World plants of the genus Tropaeolum, having pungent juice and long-spurred, usually yellow, orange, or red irregular flowers.

旱金蓮屬植物一種西半球植物旱金蓬屬国产福利自，有刺激性的汁液和長(zhǎng)桿，通常開(kāi)黃色99热W亚洲精品国产99，橙色或紅色不規(guī)則的花

Because of the regional difference of soil and climatic conditions, the division of 4 stages of soil moisture circulation is not all the same between different areas; the soil moisture dynamics between different dry farming areas in the Yellow River Basin is contrasted in this report. The results indicate that soil moisture increases gradually from dry semi-arid area to semi-arid area, dry semi-humid area and semi-humid area, and the high value district generally appears during soil moisture resuming period in rainy season or soil melting period. While the low value district appears at the stage of fast evaporation in spring or slow evaporation in autumn; in views of vertical changes of soil moisture, it is showed that the variation range of upper lays is larger than that of lower among the different dry farming areas in the Yellow River Basin.

由于各區(qū)域之間土壤18禁片免费网站在线看、氣候條件的差異，各地土壤水分循環(huán)4個(gè)階段的劃分也不盡相同美女视频在线观看永久免费；黃河流域不同旱作類(lèi)型區(qū)土壤水分動(dòng)態(tài)變化比較結(jié)果表明：就季節(jié)變化而言(來(lái)源：A70b0B0bC論文網(wǎng)www.abclunwen.com)免费看国产黄A片在线，由半干旱偏旱區(qū)→半干旱區(qū)→半濕潤(rùn)偏旱區(qū)→半濕潤(rùn)區(qū)土壤水分含量呈逐漸增加的變化趨勢(shì)，而且高值區(qū)一般出現(xiàn)在雨季恢復(fù)階段或春季土壤融凍返漿時(shí)期欧美一级aa黄片系列精品99；而低值區(qū)均出現(xiàn)在春季大量蒸發(fā)階段或秋季緩慢蒸發(fā)階段日韩美女精品中文字幕在线；就垂直變化而言，黃河流域不同旱作類(lèi)型區(qū)土壤水分垂直變化的趨勢(shì)均表現(xiàn)為上層變化幅度較下層大在线观看中文字幕网。

Although there is a large of arid or semi-arid area and abundant plant source in North China,the globle warm and environment change made so many xerophil species face to huge challenges of unfavorable environment,especially,water stress.

中國(guó)北方地區(qū)因其獨(dú)特的地理位置和氣候條件免费一级毛片在线播放女同，使該地區(qū)旱生植物資源非常豐富，但受全球氣候變暖的影響天天视频在线50页免费观看，荒漠化程度日益嚴(yán)重欧美日韩国产精品第页，而這些旱生植物種群也將面臨原有生存環(huán)境發(fā)生改變的嚴(yán)峻考驗(yàn)，其中人人爽爽人人爽人人精品，水分條件的改變是學(xué)者們普遍公認(rèn)的重要環(huán)境改變之一51国产黄色视频。

It will become on the basis of theory that the forest of xerophilous arbor and shrub will expanded using the limited sources of water in the aird zone.

查明此現(xiàn)象，將有助于進(jìn)一步認(rèn)識(shí)旱生植物與其生存環(huán)境關(guān)系的多樣性欧美大屁股XXXX潮喷，從而為干旱區(qū)利用有限的水源以擴(kuò)展旱生喬灌林木提供有價(jià)值的理論依據(jù)国产va精产。

The result showed that the desiccated environment in oases driven by the decline of underground water level was favorable for the growth and develoment of N. tangutorum community, and made this species more xerophilous.

結(jié)果表明影音先锋最新AV网站，以地下水位逐年下降為主要驅(qū)動(dòng)因素的綠洲外圍的環(huán)境旱化，促使優(yōu)勢(shì)種白刺群落的發(fā)育適應(yīng)環(huán)境日韩成人国语在线视频观看免费播放，更具旱生性无码一级淫片免费观看。

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(lèi)活動(dòng)的加劇15yc午夜福利在线视频，該區(qū)公路沿線高寒草甸類(lèi)草地群落結(jié)構(gòu)表現(xiàn)出了較強(qiáng)的穩(wěn)定性操美女视频网站，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(duì)較差色拍拍网，草地群落為適應(yīng)新的生境而發(fā)生了自然演替国产性爱专区；沼澤化草甸亞類(lèi)草地植物群落中群落伴生種的種類(lèi)增加，優(yōu)勢(shì)種嵩草屬植物在群落中的比重有所下降一级一片免费观看。

In the present study, the effect of salinity on the germination for euhalophyte and xerophyte, and the strategies for adaptation of halophytes to extreme saline and arid environments in Xinjiang during seed germination stage were investigated;the osmotic adjustment traits of euhalophyte and xerophyte were also investigated in field and controlled conditions.

本文研究了鹽分對(duì)真鹽生植物和旱生植物種子萌發(fā)的影響以及鹽生植物種子萌發(fā)階段適應(yīng)新疆極端鹽漬和干旱環(huán)境的策略成年人的福利；在野外和室內(nèi)條件下對(duì)真鹽生植物和旱生植物滲透調(diào)節(jié)特性進(jìn)行了比較研究。

The differentiation states of costae indicates the ways they absorb and transport water, and their ability adapting to the dry conditions, which was elucidated by the following examples: Brachythecium plumosum, because of its thin cell-walls in the costae and the absence of hydrome, assistant and steroid cells, can absorb water and nutrition under shady and moist conditions; Plagiomnium rostratum, though often grows in shady and wet condition, has hydrome and steroid cells, a feature similar to those of xeric mosses, which endows it to grow in the conditions with periodical drought stress during its life cycle; Hygrohypnum luridum is characterized by its slender leaves with only one layer of cells, the thin cell-walls, the absence of filaments on the leaf surface, and the fewer layer cells in the costae, the absence of hydrome and steroid cells. These features make it adaptable to aquatic environments. For Pogonatum inflexum and Atrichum undulatum, their ventral surfaces covered with lamella, while for Racomitrium japonicum, Thuidium cymbifolium, Macromitrium ferriei, Diphyscium fulvifolium, Barbula unguiculata and Ceratodon purpureus, their leaves are strongly mammillose or papillos. Such appendiculate structures made them adaptable to thy conditions.

例如欧美十日韩十国产，蔭濕生環(huán)境下的羽枝青蘚Brachythecium plumosum性激慰在线网站观看，其中肋細(xì)胞胞壁較薄，無(wú)導(dǎo)水主細(xì)胞和副細(xì)胞的分化欧美精品无遮挡，也沒(méi)有厚壁細(xì)胞分化日本高清www在线观看视频，能夠在陰濕環(huán)境下吸收水分和養(yǎng)分；鈍葉匍燈蘚Plagiomnium rostratum具有與旱生蘚類(lèi)植物相似的中肋結(jié)構(gòu)亚洲精品成人AV观看青青，葉片較厚永久精品在线观看视频，中肋具導(dǎo)水主細(xì)胞，中肋背面具厚壁細(xì)胞超碰在线艹，這些特點(diǎn)使該種蘚類(lèi)植物能夠分布于間隙性干旱脅迫的環(huán)境中可以看的免费黄色网站；水灰蘚Hygrohypnum luridum葉片纖細(xì)柔弱，僅1層細(xì)胞最新午夜国内自拍视频，細(xì)胞胞壁薄黄色超碰在线观看，葉表無(wú)附屬結(jié)構(gòu)，中肋細(xì)胞層數(shù)少91在线视频网站首页，無(wú)導(dǎo)水主細(xì)胞分化在线a视频48saocom，也沒(méi)有厚壁細(xì)胞，這些特點(diǎn)使得水灰蘚'能夠生長(zhǎng)在水生環(huán)境中AV网站天堂网；東亞小金發(fā)蘚Pogonatum inflerum和波葉仙鶴蘚Atrichum undulatum的葉腹面覆蓋著櫛片精品伊人久久大线蕉色首页，東亞砂蘚Racomitrium japonicum、大羽蘚Thuidium cymbifolium99超碰在线播放、福氏蓑蘚Macromitrium ferriei日韩特黄一区二区、東亞短頸蘚Diphyscium fuhifolium、扭口蘚Barbula unguiculata和角齒蘚Ceratodon purpureus的葉片表面有乳頭狀突起或疣狀物，這些附屬結(jié)構(gòu)使它們能夠適應(yīng)于旱生的環(huán)境中卡通伦欧美有码亚洲。

The Acer truncatum and the Cotinus coggygriaare simmilar to the Platycaldus orientalis in the mechanism ofdrought tolerance,having relatively strong ability of〓taking in,saving and holding water.

最后根據(jù)供試樹(shù)木的耐旱特點(diǎn)国产Av天堂亚洲国产A√，結(jié)合太行山區(qū)的立地特點(diǎn)及治理方針，提出了不同造林目的和特定立地條件下選擇耐旱樹(shù)種的原則意見(jiàn)人人摸人人人人操人人。