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马晓东.干旱胁迫下胡杨实生幼苗氮素吸收分配与利用特性.生态学报,2018,(20).http://dx.doi.org/10.5846/stxb201711282136  
干旱胁迫下胡杨实生幼苗氮素吸收分配与利用特性
Characteristics of nitrogen absorption, distribution and utilization by Populus euphratica seedlings under drought stress.
投稿时间:2017-11-28  修订日期:2018-04-28
DOI: 10.5846/stxb201711282136
关键词胡杨实生幼苗  15N示踪技术  分配率  利用率
Key WordsPopulus euphratica seedlings  15N isotope tracer technique  distribution rate  utilization rate.
基金项目中国科学院西部之光项目(2015-XBQN-A-09),国家重点实验室开放课题(GZS-2015-03),国家科技支撑计划课题(2014BAC15B02)
作者单位E-mail
马晓东 新疆师范大学 mxd1107@126.com 
摘要点击次数 150
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摘要:
胡杨(Populus euphratica)是塔里木河流域荒漠河岸林重要的抗逆种质资源,水分和氮素是限制胡杨幼苗的存活及生长的主要因子。本研究利用15N同位素示踪技术探究水和氮素的交互作用对胡杨幼苗不同生长阶段氮素的吸收分配利用特征及生长的影响。试验以1年生胡杨实生幼苗为研究对象,采用温室内盆栽试验,设置4个干旱处理(D1、D2、D3、D4,土壤相对含水量为:20%~25%、40%~45%、60%~65%、80%~85%)和3种氮素水平(N0、N1、N2:0、3、6 g.pot-1)测定胡杨幼苗的生长指标和各部分的Ndff、分配率及利用率。结果表明:胡杨幼苗在土壤相对含水量60%-65%(D3)、氮素添加量3 g.pot-1(N1)时,其生长表现为最佳状态;干旱胁迫下,不同氮素添加量对胡杨幼苗各部分的Ndff值存在显著差异,N2低于N1;随干旱胁迫减弱(D3、D4),植株在生长早期(25d)根部吸收的15N优先向地上部分转运,生长后期(75d)植株Ndff最高,其中以根系中Ndff最高;不同生长期幼苗各部分的15N分配存在显著差异,根系15N分配率较高,但不同氮量处理间差异不显著;随生长期的推移,植株对15NH415NO3的利用率表现为粗根最大,各处理中D3N1处理均显著高于其他处理。结论:轻度干旱胁迫下添加适量的氮素能够增强植株对氮素的吸收征调能力,优化水资源获取以维持生存的重要机制。
Abstract:
Abstract: Populus euphratica is an important stress-resistant germplasm resource for desert riparian forests in Tarim River Basin. The survival and growth of P. euphratica seedlings are always limited by water and nitrogen. In this experiment, 15N isotope tracer technique was used to explore the effect of its nitrogen absorption, distribution and utilization when different growth stages under different interaction of water and nitrogen levels. Four water treatments (D1, D2, D3 and D4 with soil relative water contents of 20%–25%, 40%–45%, 60%–65% and 80%–85%, respectively) and three nitrogen application levels (N0, N1, N2: 0, 3, 6 g·pot-1) were used to determine the growth index, Ndff, distribution rate and utilization rate of P. euphratica seedlings. The results showed that P. euphratica seedlings had the best growth performance when soil relative water content was 60%–65% (D3) and nitrogen application level was 3 g·pot-1 (N1); under drought stress, there were significant differences in Ndff values of different parts of seedlings under different nitrogen application levels, and N2 was lower than N1; With the decrease of drought stress (D3, D4), the uptake of 15N in roots was preferentially transported to the ground part at the early growth period (25d) . Ndff was the highest, especially in root system at the late growth period (75d). The distribution of 15N was significantly different in different parts of seedlings, the 15N distribution rate of roots was higher, but there was no significant difference among treatments with different nitrogen application levels. Growing with the plant, The utilization rate of crude root is the highest, and the D3N1 treatment was significantly higher than other treatments. So, Adding proper amount of nitrogen can enhance the ability of plants to nitrogen absorption under slight drought stress.
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