本科生畢業(yè)論文“標(biāo)準(zhǔn)格式示范”-免費(fèi)閱讀
【正文】 綜合以上前人研究可以看出，鹽溶液濃度的增加對(duì)海濱錦葵種子的萌發(fā)、苗的生長(zhǎng)發(fā)育以及與生育密切相關(guān)的生理活動(dòng)均產(chǎn)生了明顯的抑制作用。雖然海濱錦葵具有較強(qiáng)的耐鹽能力，但在鹽分濃度高的地區(qū)仍然難以實(shí)現(xiàn)一播齊苗。以上分析表明，鹽分脅迫對(duì)海濱錦葵葉片生理活性產(chǎn)生了顯著影響，鹽分濃度越高，影響就越為嚴(yán)重。游離氨基酸是合成蛋白質(zhì)的主要物質(zhì)，其含量的多少直接影響到可溶性蛋白的含量，進(jìn)而影響到葉片中多種酶的含量，并最終影響到葉片的生理功能。隨著鹽分濃度的增加，總根系長(zhǎng)度也顯著下降，%%。 表2表明，隨著鹽分濃度的增加海濱錦葵株高逐漸降低，播種后45d對(duì)照、%、%、%%；鹽分脅迫嚴(yán)重影響了出葉速度，播種后45d對(duì)照、%、%%、各處理間的差異均達(dá)到顯著水平，%鹽分濃度條件下，真葉無法生長(zhǎng)。若要使得成活率維持在75%以上，%以下。播種后20d和30d測(cè)定子葉片（子葉和真葉）的長(zhǎng)和寬、根、莖、葉等各個(gè)器官的鮮重和干重、根系長(zhǎng)度和主側(cè)根數(shù)目。試驗(yàn)采用單因素隨機(jī)區(qū)組設(shè)計(jì)，每個(gè)鹽分濃度育苗基質(zhì)裝8盤，5個(gè)鹽分濃度合計(jì)40盤。有機(jī)物和土壤混合比例為體積比3：1。這三者都會(huì)導(dǎo)致鹽堿地種植作物（植物）難以實(shí)現(xiàn)高產(chǎn)優(yōu)質(zhì)。%時(shí)，所受的負(fù)面影響相對(duì)較小。關(guān)鍵詞：海濱錦葵；鹽分脅迫；生長(zhǎng)發(fā)育；生理活性The Impact of Salt Stress on Salttolerant Bioenergy Plant K. virginica (L ) Presl.Abstract: The objective of this research was to make a probe into the effects of salt stress (0, %, %, % and %) on the growth and physiological characteristics of K. virginica seedlings so as to provide a solid base for the further research of seedling breeding. The seeds were sown into the pots of seedling plastic matrix containing the cultural mixture of organic substrate and conventional soil. Generally, when salt concentration in the mixture was less than %, the emergence rate was about %. When salt concentration in the mixture is higher than %, the emergence rate and survival rate of seedlings were higher than %. If the survival rate is expected be higher than %, salt concentration in the mixture should be kept lower than %. After seed transplantation, as salt concentration strengthened, the growth of root and leaf was greatly inhibited, the length and width of true leaves was significantly smaller than the control, the leaf age and fresh weight of different organs decreased significantly, and the root activity decreased as well. The concentration of soluble protein and SOD activity decreased significantly, and the free amino acid concentration and MDA concentration in leaves increased under salt stress, and photosynthetic characteristics in leaves were significantly influenced. As salt concentration less than %, the negative influence on K. virginica was low.Key words: Kostelezkya virginica (L. ) Presl.。其中最基本和最首要的問題是實(shí)現(xiàn)海濱錦葵的齊苗、勻苗和壯苗。有機(jī)物基質(zhì)氮磷鉀有效養(yǎng)分總含量（N+P2O5+K2O）
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