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【正文】 葉片長(zhǎng)和寬間的差異未達(dá)到顯著水平，%時(shí)，葉片已接近脫落，無法進(jìn)行光合作用。下同?？梢?，%時(shí)，子葉生長(zhǎng)發(fā)育所受的影響較小，%時(shí)，子葉生長(zhǎng)發(fā)育所受的影響較大。%時(shí)，對(duì)照、%%處理間的差異較小。 鹽分脅迫對(duì)海濱錦葵苗期生長(zhǎng)發(fā)育的影響在種子內(nèi)部養(yǎng)分消耗殆盡和真葉開始發(fā)揮光合作用之前，子葉生長(zhǎng)發(fā)育的好壞直接影響著出苗和苗的生長(zhǎng)發(fā)育。由圖2可見，隨著土壤鹽分濃度的增加，海濱錦葵移栽后成活率呈現(xiàn)逐漸下降趨勢(shì)，%、%、%、%%。 鹽分對(duì)海濱錦葵出苗率和移栽后成活率的影響由圖1可見，隨著基質(zhì)鹽分濃度的增加，出苗率逐漸降低，對(duì)照、%、%、%%%、%、%、%%。葉片光合特性采用Li6400光合儀測(cè)定，包括光合速率、氣孔導(dǎo)度和蒸騰速率等。待移栽后進(jìn)行根系和葉片生理活性、葉片光合性能的測(cè)定[13]。待種子萌發(fā)出苗、兩張子葉展平時(shí)調(diào)查統(tǒng)計(jì)出苗率。苗床管理參照棉花基質(zhì)穴盤育苗的方法進(jìn)行。噴水使苗床保持足夠的濕度。播種前，將海濱錦葵種子用75℃的溫水浸泡15min，以促進(jìn)種子萌發(fā)和出苗?？讖缴洗笙滦。蠌?cm。育苗采用專用塑料穴盤，規(guī)格為長(zhǎng)50cm，寬30cm，高5cm。按照育苗有機(jī)物/土壤混合基質(zhì)的重量和相應(yīng)的鹽分濃度水平，稱取一定量的海鹽溶解于水中形成一定濃度的鹽溶液。有機(jī)物基質(zhì)氮磷鉀有效養(yǎng)分總含量（N+P2O5+K2O）%。試驗(yàn)采用有機(jī)物/土壤混合基質(zhì)穴盤育苗方法進(jìn)行。試驗(yàn)于2007年在揚(yáng)州大學(xué)實(shí)驗(yàn)農(nóng)場(chǎng)進(jìn)行。目前棉花等作物的育苗技術(shù)日益成熟[5]，主要包括土質(zhì)營養(yǎng)缽育苗移栽、營養(yǎng)塊育苗移栽、蘆管育苗移栽[67]、紙制營養(yǎng)缽育苗移栽[8]、有機(jī)基質(zhì)育苗移栽和棉花水浮育苗移栽[9]等。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。鹽堿地由于土壤含鹽量高，其種植作物（植物）主要面臨三個(gè)方面的問題，一是出苗率、成苗率低；二是苗期營養(yǎng)生長(zhǎng)不夠或者不當(dāng)，難以搭起豐產(chǎn)架子；三是果實(shí)（籽粒）灌漿強(qiáng)度不夠或者灌漿速度慢。 言隨著生物質(zhì)能產(chǎn)業(yè)的發(fā)展，耐鹽能力強(qiáng)的海濱錦葵等鹽土能源植物的高產(chǎn)、優(yōu)質(zhì)、高效、生態(tài)和安全生產(chǎn)越來越受到重視。 growth。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 activ
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