摘要
通过水培试验研究了弱光下不同硝铵比对小白菜硝酸盐吸收和体内碳氮化合物在不同器官间分配的影响。结果表明:全硝培养条件下,与自然光相比,弱光导致小白菜叶片、叶柄和根系的干物重分别下降了73.8%、82.2%和74.4%;总碳及氮含量也分别下降了76.7%、84.5%和79.4%及71.2%、79.5%和80.4%;根系活力和硝态氮吸收量也显著下降。通过调节弱光下营养液的硝铵比,降低了硝态氮的吸收,促进了碳的同化和氮的积累,小白菜的干物重增加。当硝铵比为85:15时,小白菜取得最大的干物重,总碳氮积累量、根系活力与硝态氮吸收量随铵的增加而持续减少。
A hydroponic experiment was carried out to investigate the effect of light intensity and NO3^- -N/NH^＋ -N ratios on the content of total carbon and total nitrogen in different organs, root activity and nitrate absorption of Pakchoi. Results show that： （1）when there was no ammonium in the nutrient solution, low light intensity （50% of nature light） decreased dry weight of the leaf, petiole and root by 73.8% , 82.2% and 74.4% ; total carbon by 76.7% , 84.5% and 79.4% , and total nitrogen by 71.2% ,79.5% and 80.4% respectively. （2）low light intensity also decreased root activity and nitrate absorption of the plant significantly and （3）under low light intensity, dry weight, total carbon, total nitrogen and root activity of the plant peaked when nitrate/ammonium ratio was 85 ： 15 in the solution, and nitrate absorption by the plant decreased with increasing ammonium supply.
出处
《土壤学报》
CAS
CSCD
北大核心
2009年第3期452-458,共7页
Acta Pedologica Sinica
基金
国家自然科学基金项目(30270790)资助
关键词
弱光
硝铵比
小白菜
碳
氮
Low light intensity
Nitrate/ammonium ratio
Pakchoi
Carbon
Nitrogen
