%0 Journal Article
%T Accumulation characteristics of biomass and nitrogen and critical nitrogen concentration dilution model of cotton reproductive organ<br>棉花蕾花铃生物量、氮累积特征及临界氮浓度稀释模型
%A Xue Xiaoping
%A Sha Yizhuo
%A Guo Wenqi
%A Zhou Zhiguo
%A <br>薛晓萍
%A 沙奕卓
%A 郭文琦
%A 周治国
%J 生态学报
%D 2008
%I 
%X Several nitrogen (N) field experiments were carried out in Nanjing and Anyang, China, to study the dynamic characteristics of biomass accumulation and N uptake, and to define the dilution curve for critical N concentration in cotton reproductive organ over the growth period. The results show that the total biomass and N accumulation were affected significantly by the rate of N application, exhibiting a sigmoid curve over time. The beginning time of fast N accumulation was 1–5 d earlier than that of biomass accumulation. The cotton lint yield was correlated with N concentration in the reproductive organ and fluctuated with varying N concentration, indicating the existence of luxurious N consumption in the cotton reproductive organ. The N concentration increased with increasing N application rates, and decreased gradually during the growth period. The relationship between biomass and N concentration can be described with a power equation. The patterns of the N concentration dilution model were consistent at both experimental sites, but the model parameter values of a differed. The results presented in this paper indicate that a critical N concentration dilution curve for cotton reproductive organ is independent of ecological region and can be described with a power equation.
%K cotton
%K cotton reproductive organ
%K biomass
%K nitrogen accumulation
%K critical nitrogen concentration
%K nitrogen dilution model<br>棉花
%K 蕾花铃
%K 生物量
%K 氮累积
%K 临界氮浓度
%K 氮稀释模型
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=383CA90E4BDFD5E9E85C83D0A53A474E&yid=67289AFF6305E306&vid=D3E34374A0D77D7F&iid=59906B3B2830C2C5&sid=B36B168D6B202650&eid=728E4C3ADD692D36&journal_id=1000-0933&journal_name=生态学报&referenced_num=1&reference_num=32