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annual plant 一年生植物。

annual ring

The study investigated aboveground growths of caragana korshinskii and artemisia ordosica planted in four modes , revealing that in different planting modes their densities , heights and canopy width and biomasses remained unchanged or tended to decrease slightly ; the young shoots of a . ordosica annually grew in a s - shaped cure and the young shoots of c . korshinskii grew fast in spring and grew slowly or cease to grow from july on ; the biomasses and leaf area indexes of c . korshinskii and a . ordosica annually varied in a double peak curve and there were 8 annual plants that invaded in the four planting modes and formed higher coverage ; the quadrat with only a . ordoska appeared to have obviously lower coverage and biomass that the other three quadrats 摘要對騰格里沙漠東南緣2種人工植被檸條和油篙在4種配置方式下地上部分的生長動態進行了研究,結果表明:不同配置方式下它們的密度、高度、冠幅和生物量基本不變或略微呈下降趨勢;油篙新梢的年生長動態呈s型曲線,檸條新梢春季生長速度較快, 7月份以后生長速度緩慢或基本停止生長;檸條、油篙地上生物量和葉面積指數的年變化均表現為雙峰型, 4種配置方式下共有8種1年生植物人侵,并具有較高的植被蓋度;同其它3個樣地相比,純油篙樣地1年生植物的密度、蓋度和生物量明顯偏低。

Vegetation dynamics and soil characteristics of different period abandoned land was conducted in typical steppe at xilinguole league and meadow steppe at hulunbeier league , inner mongolia . the results showed : the function community of annual plants , perennial rhizornatous grasses and perennial rosette grasses were appeared at different succession stage of abandoned land in typical steppe and meadow steppe 本試驗分別在內蒙古錫林郭勒盟典型草原帶和呼倫貝爾盟草甸草原帶對不同撂荒年限的撂荒地植被動態及土壤特性進行了研究,目的是探討草原區撂荒地植被演替的規律,為撂荒地植被的重建提供理論依據。

The reproductive characteristics and population structure of artemisia ordosica , hedysantm scoparium , caragana korshinskii and the reproductive characteristics of annual plants eragrostis poaeoides and bassia dasyphylla were observed in shapotou artificial revegetation area . stability of the artificial vegetation was appraised from the views of its persistence and variability under local natural condition . the study showed that : the artificial - natural vegetation built with sandbreaks and plants is stable in shapotou area 通過對沙坡頭人工固沙植被區主要建植種群檸條( caraganakorshinskii ) 、花棒( hedysarumscoparium )和油蒿( artemisiaordosica )的繁殖特性及種群結構的研究,以及自然侵入的一年生草本植物小畫眉草( eragrostispoaeoides )和霧冰藜( bassiadasyphylla )繁殖特性的研究,探討了在植被的持久性和變異性,分析評價了主要受惡劣環境壓力下的人工固沙區植被的穩定性。

The perennial vegetation is expected to a . ordosica dominated and h . scoparium stably co - existed , together with an annual plant population of e . poaeoides and b . dasyphylla , which is greatly fluctuated with annual precipitation pattern 其將與因年際間降水量及其分布差異引起的種群密度等特征波動的一年生草本小畫眉草和霧冰藜種群長期共存。

Trees as well as 2 . 7 million flowering shrubs and annual plants for these venues and carried out landscape improvement projects for 30 hectares of park land and roadside amenity areas . hong kong flower show 年內,該署在轄下場地種植了六萬棵樹木及270萬株顯花灌木和年生植物,并為30公頃公園用地和路旁市容地帶進行園景改善工程。

A prin cipal reason was that most trees , unlike annual plants , cannot readily be propagated from cuttings 一個主要的原因就是不像一年生植物,大多數林木經過砍伐之后,不能馬上繁殖。

Winter annual plant 冬性一年生植物

My garden is filled with annual plants 我的園子里長滿了一年生植物。