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| 不同N、P添加水平对黄顶菊叶片化学计量特征的影响 |
| Effects of Different N, P Addition Levels on Leaf Stoichiometry Characteristics of Flaveria Bidentis |
| Received:November 10, 2014 |
| DOI：10.13254/j.jare.2014.0318 |
| 中文关键词: 黄顶菊;入侵植物;化学计量特征;生长速率假说 |
| 英文关键词: Flaveria bidentis;invasive plant;stoichiometry characteristics;growth rate hypothesis |
| 基金项目:天津市自然科学基金项目(12JCQNJC09800);公益性行业(农业)科研专项经费项目(201103027) |
| Author Name | Affiliation | E-mail | | CHEN Xin-wei | College of Plant Protection, Shenyang Agriculture University, Shenyang 110866, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YANG Dian-lin | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIU Hong-mei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WANG Hui | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | HUANGFU Chao-he | College of Plant Protection, Shenyang Agriculture University, Shenyang 110866, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | huangfu24@163.com; | | TU Chen-yang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | 755808051@qq.com |
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| 中文摘要: |
| 黄顶菊(Flaveria bidentis)为新入侵我国的一种恶性杂草,研究其化学计量特征可以了解入侵植物在不同环境中的生存和适应策略.通过网室盆栽控制试验,研究了土壤N、P添加对黄顶菊植株生长、N、P化学计量特征和叶绿素含量的影响.结果表明,土壤N、P添加比例相同条件下,养分水平对叶片N:P的影响显着;随着N、P添加量的增加,叶片N:P比显着下降,地上生物量较对照均显着增加,其中高N素比例对叶片N:P影响最大,当叶片N:P比>21.24时,植株生长速率较低,符合生长速率假说.土壤N和叶片N含量与黄顶菊叶片叶绿素含量成正相关,黄顶菊叶片N(P)含量和地上生物量均随着土壤N(P)含量的增加呈现先增加后下降趋势.黄顶菊叶片N:P<20.86为N限制,叶片N:P>21.24为P限制. |
| 英文摘要: |
| Flaveria bidentis is a worst weed newly invaded in China, studying on its stoichiometry can help us understand its strategy to invade and adapt in different environments. In a green house, we studied the effect of soil N, P addition on F. bidentis plant growth, N, P stoichiometry characteristics and leaf chlorophyll content. The results showed that the effect of different N or P level on leaf N:P was significantly different with equivalent N:P ratio used. Leaf N:P was reduced significantly with N, P addition increasing, but above ground biomass was decreased also, this effect was mainly attributed to the amount of N used. When leaf N:P was larger than 21.24, plant growth rate became lower, which was in line with the growth rate hypothesis. Soil N and leaf N content had a positive correlation with leaf chlorophyll content of F. bidentis. Both F. bidentis leaf N (P) content and aboveground biomass were increasing firstly and falling later with soil N (P) content increasing. N and P were regarded as growth restrictive elements, when leaf N:P was below 20.86 and above 21.24, respectively. |
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