Effects of atmospheric ammonia enrichment and nitrogen status on the growth of maize
Effects of atmospheric ammonia enrichment and nitrogen status on the growth of maize
复制标题
DOI：
10.1080/00380768.2011.654349
复制
发表时间：
2012-02
影响因子：
2
通讯作者：
Xiaoli Chen;Pute Wu;Xining Zhao;Shiqing Li
中科院分区：
文献类型：
--
作者：
Xiaoli Chen;Pute Wu;Xining Zhao;Shiqing Li
大气氨（NH3）浓度升高会影响作物的生长。研究了大气NH3在氮剥夺和氮充足（分别为ND和NS）条件下对玉米植株生长的影响。植物在开顶室（OTCs）中暴露于0和1000 nL L−1 NH3中50天。在不同的生长阶段，注射NH3后，在2006年和2007年，氮剥夺植物的株高、单株叶面积和茎部生物量（总生物量）显著增加，而氮充足植物的相应值保持不变或略有下降。在营养液中有氮和无氮条件下，净光合速率（Pn）和叶绿素相对含量（SPAD值）随NH3的增加而增加，但每年缺氮植株的Pn和SPAD值的增量是富氮植株的2倍。玉米的茎根比（S/R）在生长季节呈先下降后上升的趋势。在注入NH3 50 d后，两年内ND‐1000植株的S/R均显著高于ND‐0植株。结果表明，大气NH3对玉米生长的影响主要是由于对茎部生长的响应。
Enhanced atmospheric ammonia (NH3) concentration could impact growth of crops. The effect of atmospheric NH3 in combination with nitrogen‐deprived and ‐sufficient supply (ND and NS, respectively) on growth of maize plants (Zea mays L.) was investigated. Plants were exposed to 0 and 1000 nL L−1 NH3 for 50 days in open‐top chambers (OTCs). At different growing stages after injecting NH3, elevated NH3 significantly increased plant height, leaf area per plant and shoot biomass (total biomass) in the nitrogen‐deprived plants in 2006 and 2007, but the corresponding values in the nitrogen‐sufficient plants remained the same or slightly decreased. The values for net photosynthesis rate (Pn ) and relative content of chlorophyll (SPAD value) increased with NH3 enhancement both in the presence and absence of nitrogen in nutrient solution, but the increment of Pn and SPAD value in nitrogen‐deprived plants was two times higher than that of the nitrogen‐sufficient plants in each year. The shoot: root ratio (S/R) for maize first decreased and then rose during the growing season. At 50 days after injecting NH3, the S/R in the ND‐1000 plants was significantly higher than that in the ND‐0 plants in both years. Under these conditions, increased growth was observed, and it was concluded that the effect of atmospheric NH3 on maize could be mainly due to the shoot growth response.