草业学报 ›› 2021, Vol. 30 ›› Issue (6): 64-72.DOI: 10.11686/cyxb2020245
马英1(), 许志豪1, 曾巧红1, 孟建龙2, 胡亚虎1(), 苏洁琼3
收稿日期:
2020-05-26
修回日期:
2020-07-16
出版日期:
2021-05-21
发布日期:
2021-05-21
通讯作者:
胡亚虎
作者简介:
Corresponding author. E-mail: huyh@lzu.edu.cn基金资助:
Ying MA1(), Zhi-hao XU1, Qiao-hong ZENG1, Jian-long MENG2, Ya-hu HU1(), Jie-qiong SU3
Received:
2020-05-26
Revised:
2020-07-16
Online:
2021-05-21
Published:
2021-05-21
Contact:
Ya-hu HU
摘要:
为研究氮(N)沉降增加后荒漠草本植物的养分利用策略及碳(C)同化能力和分配格局的变化,以腾格里沙漠东南缘的典型荒漠化草原为研究区,分析了N素添加下不同功能型草本植物根部和地上部化学计量比的变化。结果表明:N素添加会导致土壤中总N、铵态N以及植物体内N含量的显著增加,同时会促进多年生植物尤其是非禾本科植物对磷(P)的吸收,但会显著降低一年生植物根部P的含量。一年生和多年生非禾本科植物的C含量在N素添加下显著降低,多年生禾本科植物的C含量则表现出显著的器官差异,其中地上部的C含量显著降低,而根部显著增加。不同功能型植物体内的C/N和C/P(除一年生植物根部的C/P)在N素添加后显著降低,且二者均表现出根部大于地上部的趋势。植物的N/P在N素添加下显著增加,尤其是一年生植物的变化趋势随施肥水平的变化更加显著。可见,在N素受限的荒漠化草原,外源N素输入导致的土壤N素有效性提升后会凸显P素对植物生长的限制性作用,同时会降低草本植物的C同化能力并加强C向植物根部的分配。
马英, 许志豪, 曾巧红, 孟建龙, 胡亚虎, 苏洁琼. 氮素添加对荒漠化草原草本植物养分化学计量特征的影响[J]. 草业学报, 2021, 30(6): 64-72.
Ying MA, Zhi-hao XU, Qiao-hong ZENG, Jian-long MENG, Ya-hu HU, Jie-qiong SU. Impact of nitrogen addition on stoichiometric characteristics of herbaceous species in desert steppe[J]. Acta Prataculturae Sinica, 2021, 30(6): 64-72.
图1 不同N素添加处理下土壤全N和有效态N素含量的变化不同小写字母表示不同处理间差异显著(P<0.05)。Different lowercase letters indicate significant differences among different treatments at the P<0.05 level.
Fig.1 Changes of soil total N and available N content under different N addition treatments
试验因素 Experimental factors | 碳C | 氮N | 磷P | |||
---|---|---|---|---|---|---|
F | P | F | P | F | P | |
氮肥处理 Nitrogen treatment (N) | 10.292 | <0.001 | 367.064 | <0.001 | 41.045 | <0.001 |
植物类型 Plant type (PT) | 320.504 | <0.001 | 64.697 | <0.001 | 282.462 | <0.001 |
植物器官 Plant organ (PO) | 4.091 | <0.050 | 2505.708 | <0.001 | 3126.423 | <0.001 |
N×PT | 24.538 | <0.001 | 20.713 | <0.001 | 78.397 | <0.001 |
N×PO | 51.786 | <0.001 | 67.221 | <0.001 | 19.794 | <0.001 |
PT×PO | 126.714 | <0.001 | 171.746 | <0.001 | 372.315 | <0.001 |
N×PT×PO | 29.831 | <0.001 | 9.669 | <0.001 | 27.573 | <0.001 |
表1 植物C、N、P含量的多因素方差分析
Table 1 Results of the univariate multi-factor ANOVA on the content of C, N, and P in the plant
试验因素 Experimental factors | 碳C | 氮N | 磷P | |||
---|---|---|---|---|---|---|
F | P | F | P | F | P | |
氮肥处理 Nitrogen treatment (N) | 10.292 | <0.001 | 367.064 | <0.001 | 41.045 | <0.001 |
植物类型 Plant type (PT) | 320.504 | <0.001 | 64.697 | <0.001 | 282.462 | <0.001 |
植物器官 Plant organ (PO) | 4.091 | <0.050 | 2505.708 | <0.001 | 3126.423 | <0.001 |
N×PT | 24.538 | <0.001 | 20.713 | <0.001 | 78.397 | <0.001 |
N×PO | 51.786 | <0.001 | 67.221 | <0.001 | 19.794 | <0.001 |
PT×PO | 126.714 | <0.001 | 171.746 | <0.001 | 372.315 | <0.001 |
N×PT×PO | 29.831 | <0.001 | 9.669 | <0.001 | 27.573 | <0.001 |
图2 不同N素添加处理下植物根部和地上部C、N、P含量的变化不同大写和小写字母分别表示植物根部和地上部C、N和P含量在不同处理间差异显著,P<0.05。下同。Different capital letters and lowercase letters indicate significant differences of C, N, and P contents in plant roots and shoots among different N addition treatments at the 0.05 level, respectively. The same below.
Fig.2 Changes of C, N and P contents in roots and shoots of plants under different N addition treatments
图3 不同N素添加处理下植物体内C、N、P生态化学计量比的变化
Fig.3 Changes of ecological stoichiometry of C, N, and P in plant roots and shoots under different N addition treatments
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