[1]张中信,岳奇奇,钱申,等.外源氮添加对2种豆科牧草功能性状的影响[J].江苏农业学报,2020,(05):1197-1204.[doi:doi:10.3969/j.issn.1000-4440.2020.05.017]
 ZHANG Zhong-xin,YUE Qi-qi,QIAN Shen,et al.Effects of exogenous nitrogen addition on functional traits of two leguminous forage plants[J].,2020,(05):1197-1204.[doi:doi:10.3969/j.issn.1000-4440.2020.05.017]
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外源氮添加对2种豆科牧草功能性状的影响()
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2020年05期
页码:
1197-1204
栏目:
耕作栽培·资源环境
出版日期:
2020-10-31

文章信息/Info

Title:
Effects of exogenous nitrogen addition on functional traits of two leguminous forage plants
作者:
张中信岳奇奇钱申吴静陶冶
(安庆师范大学生命科学学院/皖西南生物多样性研究与生态保护安徽省重点实验室,安徽安庆246133)
Author(s):
ZHANG Zhong-xinYUE Qi-qiQIAN ShenWU JingTAO Ye
(The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, College of Life Sciences, Anqing Normal University, Anqing 246133, China)
关键词:
紫花苜蓿紫云英功能性状协同性
Keywords:
nitrogenMedicago sativaAstragalus sinicusfunctional traitssynergism
分类号:
Q948
DOI:
doi:10.3969/j.issn.1000-4440.2020.05.017
文献标志码:
A
摘要:
以2种常见豆科牧草紫花苜蓿(Medicago sativa)和紫云英(Astragalus sinicus)为材料,设置对照、低氮和高氮(0 kg/hm2、50 kg/hm2、100 kg/hm2)3个梯度的外源氮添加处理,对比研究了2种豆科植物苗期形态、生物量分配、含水量及叶片光合色素含量等功能性状对外源氮添加的响应及性状间的权衡特征。结果表明:随施氮量增加,紫花苜蓿形态性状及含水量根冠比,紫云英光合色素特征及叶宽、株高、叶厚均有显著变化(P<0.05),但变化趋势大多不相同。2种豆科牧草形态性状总体表现为低促高抑效应,而叶绿素b和类胡萝卜素含量则表现为施氮后明显降低。相比之下,氮添加对2种豆科牧草生物量根冠比、含水量、叶绿素a及总叶绿素含量均无显著影响(P>0.05)。主成分分析结果表明,紫花苜蓿和紫云英前2个主成分所反映的功能性状协同性在种间差异较大。可见,2种豆科牧草生长和光合色素特征对外源氮添加具有明显的差异化响应,并表现出不同的协同性。
Abstract:
In this study, two common leguminous forage plants, Medicago sativa and Astragalus sinicus, were used as materials, and three nitrogen addition treatments, i.e., control (0 kg/hm2), low nitrogen level (50 kg/hm2) and high nitrogen level (100 kg/hm2), were set up. Moreover, the responses of functional traits including morphology, biomass allocation, water content and photosynthetic pigments of two leguminous forage seedlings to exogenous nitrogen addition, and the trade-off characteristics among functional traits were comparably analyzed. The results indicated that with the increase of nitrogen application rate, the morphological traits and root-shoot ratio of water content of M. sativa, the photosynthetic pigment characteristics, leaf width, plant height and leaf thickness of A. sinicus were significantly changed (P<0.05), but the change trends were different in most cases. The morphological traits of two leguminous forage plants presented a low-promotion and high-inhibition effect, while the chlorophyll b and carotenoid contents decreased obviously after nitrogen input. In contrast, nitrogen addition showed no significant effect on root-shoot ratio of biomass, water content, chlorophyll a and total chlorophyll contents of two leguminous forage plants (P>0.05). The results of principal component analysis showed that the synergism of functional traits reflected by the first two principal components differed greatly among the two species. Consequently, the growth and photosynthetic pigment characteristics of the two leguminous forage plants exhibited differential responses to exogenous nitrogen addition, and also showed different covariant patterns.

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备注/Memo

备注/Memo:
收稿日期:2020-02-29基金项目:安徽省自然科学基金项目(1708085MC77、1808085MC59);安徽省高校自然科学研究重点项目(KJ2019A0561)作者简介:张中信(1971-),男,安徽濉溪人,博士,副教授,主要从事植物学研究。(E-mail)1377715131@qq.com通讯作者:陶冶,(E-mail)xishanyeren@163.com
更新日期/Last Update: 2020-11-16