Natural abundance of 15N in sweet potato, pumpkin, sorghum and castor bean: possible input of N2-derived nitrogen in sweet potato
Natural abundance of 15N in sweet potato, pumpkin, sorghum and castor bean: possible input of N2-derived nitrogen in sweet potato
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甘薯、南瓜、高粱和蓖麻子中 15N 的自然丰度：甘薯中 N2 源氮的可能输入
DOI：
10.1007/s003740050359
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发表时间：
1997
影响因子：
6.5
通讯作者：
T. Masuda
中科院分区：
文献类型：
--
作者：
T. Yoneyama;J. Terakado;T. Masuda
1996年6月至9月，在三个冲积土地块上分别种植了甘薯（三个品种）和南瓜、甜高粱（三个品种）和蓖麻子两种植物组合。分别于8月和9月采集甘薯和南瓜的新梢（叶+茎）和甜高粱和蓖麻的整个顶部（叶+茎和籽粒），分析其15 N（δ 15 N）的天然丰度。9月收获的2个甘薯品种的δ 15 N值显著低于南瓜，8月收获的甘薯和南瓜以及8月和9月收获的甜高粱和蓖麻的δ 15 N值差异不显著。9月收获的甘薯中观察到的较低的δ 15 N值可能表明该物种高达40%的N摄入量来自二氮。已知该物种具有从未定义的来源吸收N的高能力。
Two combinations of plant species, sweet potato (three cultivars) and pumpkin, and sweet sorghum (three cultivars) and castor bean were grown separately in three plots of alluvial soil from June to September 1996. The shoots (leaves plus stems) of sweet potato and pumpkin, and the whole tops (leaves plus stems and grains) of sweet sorghum and castor bean were harvested twice, once in August and once in September in order to analyze their natural abundance of15N (δ15N). The δ15N values of two of the varieties of sweet potato harvested in September were significantly lower than those of pumpkin, while δ15N values of sweet potato and pumpkin harvested in August, as well as those of sweet sorghum and castor bean harvested in August and September, did not significantly differ. The lower δ15N values observed in the September-harvested sweet potato may indicate that as much as 40% of the N intake of this species is derived from dinitrogen. This species is known to have a high ability to take up N from undefined sources.