老芒麦体内碳氮分配对氮素添加的响应研究

Study on the response of carbon and nitrogenpartitioning to nitrogen addition inElymus sibiricus

摘要:

以4龄青牧1号老芒麦为试验材料,在返青期进行一次性开沟施肥处理,设置6个氮素(纯氮)梯度,梯度氮素施量分别为0、45、60、75、90、105 kg/hm2。通过测定其在拔节期,开花期和成熟期根、茎、叶和穗部全碳、全氮含量,旨在明确不同氮素处理对老芒麦植株碳氮分配的影响。结果表明:青牧1号老芒麦茎,叶及穗部全碳含量在75 kg/hm2 处理下开花期最高,较同期对照分别提高了11.0%,12.1%和4.9%。根、穗部全氮含量在75 kg/hm2 处理下分别于拔节期和开花期达到最高,较同期对照提高了32.0%、16.3%,茎、叶部在105 kg/hm2 处理下分别于开花期和拔节期达到最高,较同期对照均提高了57.5%。

Abstract:

4-year-old Elymus sibiricus cv.Qingmu No.1 was used as materials.Six gradients of nitrogen(pure nitrogen) were set up in one-time ditching and fertilizing treatment during the green returning period.Thegradients of nitrogen application were 0,45,60,75,90 and 105 kg/hm2,respectively.By measuring the total carbonand nitrogen contents of roots,stems,leaves and spikes at jointing,flowering and mature stages,In order todefine the effects of different nitrogen treatments on the carbon and nitrogen distribution of the Elymus sibiricuscv.The results showed that the total carbon content of stem,leaf and spike of Qingmu No.1 was the highestat 75 kg/hm2,which was 11.0%,12.1% and 4.9% higher than that of the control.Under 75 kg/hm2 treatment,the total nitrogen content of root and spike reached the highest level at jointing stage and flowering stagerespectively,which was 32.0% and 16.3% higher than that of the control at the same period.Under 105 kg/hm2 treatment,the total nitrogen content of stem and leaf reached the highest level at flowering stage and jointingstage respectively,which was 57.5% higher than that of the control at the same period.