摘要
2010年10-11月,在人工气候箱控制条件下研究了不同氮(N)、磷(P)浓度对黄河口潮滩湿地不同生境条件下碱蓬种子萌发和幼苗生长的影响。结果表明,中潮滩碱蓬(JP1)和低潮滩碱蓬(JP2)的出芽率均随盐分的升高而降低;相同盐分条件下JP1的出芽率均高于JP2,原因可能与二者生长节律有关;高盐分条件下,JP1和JP2种子的萌发率、根重比及根冠比均在高N条件下取得最大值,分别为20.6%和2.0%,0.06和0.07,0.10和0.11,说明高N可缓解盐分胁迫对碱蓬的毒害作用。P对JP1、JP2种子萌发和幼苗生长的影响比较复杂。在无盐分胁迫下,P对二者根重比、茎重比、叶重比和根冠比的影响几乎无差别;在中等盐分胁迫下(300mmol/L),不同P浓度对二者幼苗生长的影响相近,均表现为中等P浓度不利于根、茎生长,但有利于叶生长,且根冠比均在最大P浓度(10mmol/L)时最大(0.10,0.18);在高盐分胁迫下(600mmol/L),JP1的根重比、根冠比随P浓度的增加而升高,叶重比随P浓度的增加而降低,JP2的生长状况正好与之相反。总的来说,N、P浓度对不同生境下碱蓬种子萌发及幼苗生长存在影响,且整体表现在高盐分胁迫条件下,高N浓度或低P浓度有助于二者种子萌发和幼苗生长。加之近年来黄河口营养盐呈增加趋势,且主要污染物为无机氮,P含量相对较低,由此可见黄河水的输入对黄河口潮滩碱蓬退化区的恢复具有有利的作用。
From October to November in 2010,the effects of nitrogen and phosphorus on seed germination and seedling growth of different phenotypes of Suaeda salsa under different growth conditions of the Yellow River Estuary were studied.Seed germination rates of S.salsa in the middle（JP1） and low（JP2） tidal flats reduced with increasing salinity.Under the same conditions of salinity,the JP1 germination rate was higher than that of JP2,due to growth rhythm and tidal action.Under high salinity conditions,germination rate,root/weight and root/shoot reached the maximum at a high nitrogen concentration.Thus high concentrations of nitrogen alleviated the saline toxicity.The effect of phosphorus on S.salsa was complex.Without salinity,there was no effect of phosphorus on root/weight,root/shoot,stem/weight and leaf/weight.At a salt concentration of 300 mmol/L,a moderate level of phosphorus retarded the growth of roots and stems,but favored leaf growth,and the root/shoot reached a maximum at the highest phosphorus concentration.Under high salinity conditions,S.salsa seedling growth depended on location： for JP1,root/weight and root/shoot increased as phosphorus concentration increased,and leaf/weight decreased but for JP2,the opposite changes were observed.
出处
《草业学报》
CSCD
北大核心
2012年第6期30-41,共12页
Acta Prataculturae Sinica
基金
山东省自然科学基金重点项目(ZR2010DZ001)
国家自然科学基金(41171424,40803023)
中国科学院知识创新工程重要方向项目(KZCX2-YW-223)
中国科学院战略性先导科技专项(XDA05030404)
中国科学院青年创新促进会人才培养基金资助
关键词
种子萌发
碱蓬
氮和磷
盐分胁迫
黄河口
seed germination
Suaeda salsa
nitrogen and phosphorus
salinity stress
Yellow River Estuary
