水位下降对若尔盖高寒草本沼泽木里薹草氮磷重吸收的影响

doi:10.17521/cjpe.2022.0253

植物生态学报 ›› 2023, Vol. 47 ›› Issue (6): 847-855.DOI: 10.17521/cjpe.2022.0253

所属专题：生态化学计量

水位下降对若尔盖高寒草本沼泽木里薹草氮磷重吸收的影响

胡昭佚¹, 陈天松¹, 赵丽²^,⁴, 许培轩², 吴正江¹, 董李勤¹^,³^,^*(), 张昆²

¹西南林业大学地理与生态旅游学院, 昆明 650224
²西南林业大学湿地学院, 国家高原湿地研究中心, 昆明 650224
³国家林业和草原局西南生态文明研究中心, 昆明 650224
⁴云南省水利水电勘测设计研究院, 昆明 650021

收稿日期:2022-06-16 接受日期:2023-02-14 出版日期:2023-06-20 发布日期:2023-02-24
通讯作者: * (dongliqin2013@163.com)
基金资助:
国家自然科学基金(41101097);国家自然科学基金(41461022);云南省院士专家工作站(2019IC012);云南省基础研究专项(202001AT070132);云南省教育厅基金项目(2018JS346);云南省教育厅基金项目(2019J0184);国家科技基础资源调查专项(2019FY100603)

Effect of water level drop on nitrogen and phosphorus reabsorption of Carex muliensis in a herb swamp in Zoigê wetland, China

HU Zhao-Yi¹, CHEN Tian-Song¹, ZHAO Li²^,⁴, XU Pei-Xuan², WU Zheng-Jiang¹, DONG Li-Qin¹^,³^,^*(), ZHANG Kun²

¹School of Geography and Ecotourism, Southwest Forestry University, Kunming 650224, China
²National Plateau Wetland Research Center, Wetland College, Southwest Forestry University, Kunming 650224, China
³Southwest Ecological Civilization Research Center of National Forestry and Grassland Administration, Kunming 650224, China
⁴Yunnan Institute of Water & Hydropower Engineering Investigation, Design and Research, Kunming 650021, China

Received:2022-06-16 Accepted:2023-02-14 Online:2023-06-20 Published:2023-02-24
Contact: * (dongliqin2013@163.com)
Supported by:
National Natural Science Foundation of China(41101097);National Natural Science Foundation of China(41461022);Yunnan Provincial Academician and Expert Workstation(2019IC012);Yunnan Provincial Basic Research Special Project(202001AT070132);Yunnan Provincial Department of Education Fund Project(2018JS346);Yunnan Provincial Department of Education Fund Project(2019J0184);National Science and Technology Basic Resources Investigation Special Project of China(2019FY100603)

摘要/Abstract

摘要：

养分重吸收是植物适应环境的重要策略。该研究以若尔盖高寒草本沼泽中的木里薹草作为研究对象, 通过模拟实验, 于8月、10月对绿叶和枯叶及土壤采样并测定养分含量, 研究其在水位下降和自然水位下叶片养分含量、土壤养分含量和养分重吸收效率的变化规律, 以及相互间的关系。使用单因素方差分析比较不同组间叶片氮(N)含量、叶片磷(P)含量、土壤速效N含量、土壤速效P含量、叶片N:P和养分重吸收效率的差异, 使用一元线性回归拟合土壤速效N、P含量和养分重吸收效率之间的关系, 木里薹草叶片N含量、P含量、N:P和养分重吸收效率的关系均采用Pearson相关分析。结果表明: 水位下降后, 木里薹草土壤速效N含量升高, 速效P含量降低, 进一步导致木里薹草绿叶N含量增加, P含量降低, 枯叶N、P含量均降低, 木里薹草叶片N、P重吸收效率升高, 说明水位下降通过改变土壤速效养分含量影响木里薹草绿叶养分含量, 改变植物养分获取能力(如根数、根长)影响枯叶养分含量, 进而影响养分重吸收效率。

关键词: 水位下降, 养分重吸收, 木里薹草, 若尔盖湿地

Abstract:

Aims Nutrient reabsorption is one of the important strategies for plants to adapt to the environment. In this study, we investigated the nutrient content of green and senescent leaves and soil in the Carex muliensis herb swamp in August and October, in order to examine soil nutrient content and nutrient reabsorption efficiency, as well as the relationship between them under the water level drop and natural water level based on the simulation experiment.

Methods Single factor analysis of variance was used to compare the differences of leaf nitrogen (N) content, phosphorus (P) content, soil available N content, soil available P content, leaf N:P and nutrient reabsorption efficiency among different treatments, and the relationship between soil available N, P contents and nutrient reabsorption efficiency was also fitted by univariate linear regression. Pearson correlation analysis was used to analyze the relationship of N, P contents, N:P with nutrient reabsorption efficiency in leaves of C. muliensis.

Important findings The results showed that the soil available N content increased and the available P content decreased after the water level drop, which further led to an increase in the N content and a decrease in the P content of the green leaves, a decrease in the N content and P content of the senescent leaves, and an increase in the N and P reabsorption efficiency of the leaves of C. muliensis. These results indicated that the decreased water level affected the nutrient content of the green leaves of C. muliensis by changing the contents of soil available nutrients, and thus affected the nutrient contents of the senescent leaves by changing the plant nutrient acquisition ability (i.e. root number and root length), and consequently affected the nutrient reabsorption efficiency.

Key words: water level drop, nutrient reabsorption, Carex muliensis, Zoigê wetland

胡昭佚, 陈天松, 赵丽, 许培轩, 吴正江, 董李勤, 张昆. 水位下降对若尔盖高寒草本沼泽木里薹草氮磷重吸收的影响. 植物生态学报, 2023, 47(6): 847-855. DOI: 10.17521/cjpe.2022.0253

HU Zhao-Yi, CHEN Tian-Song, ZHAO Li, XU Pei-Xuan, WU Zheng-Jiang, DONG Li-Qin, ZHANG Kun. Effect of water level drop on nitrogen and phosphorus reabsorption of Carex muliensis in a herb swamp in Zoigê wetland, China. Chinese Journal of Plant Ecology, 2023, 47(6): 847-855. DOI: 10.17521/cjpe.2022.0253

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2022.0253

https://www.plant-ecology.com/CN/Y2023/V47/I6/847

图/表 6

图1 若尔盖高寒草本沼泽研究区地理位置。

Fig. 1 Geographic location of the study area in a herb swamp in Zoigê wetland.

表1 水位下降对若尔盖高寒草本沼泽土壤、木里薹草叶片养分含量的影响(平均值±标准误)

Table 1 Effect of water level drop on nutrient content of soil and leaves of Carex muliensis in a herb swamp in Zoigê wetland (mean ± SE)

	土壤养分含量 Soil nutrient content (mg·g^-1)		叶片养分含量 Leaf nutrient content (mg·g^-1)				叶片氮磷比 Leaf N:P
	速效氮 Available N	速效磷 Available P	Ng	Pg	Ns	Ps	Ng:Pg	Ns:Ps
CK	7.14 ± 0.32^b	18.64 ± 0.89^a	13.58 ± 0.08^b	1.26 ± 0.07^a	6.24 ± 0.50^a	0.49 ± 0.05^a	10.76 ± 0.75^b	12.85 ± 0.62^b
WTD	11.29 ± 1.30^a	13.97 ± 1.73^b	16.28 ± 1.73^a	1.16 ± 0.14^b	5.02 ± 0.60^b	0.25 ± 0.06^b	14.44 ± 0.96^a	20.66 ± 1.91^a

图2 不同组的木里薹草叶片养分重吸收效率及相对重吸收效率(平均值±标准误)。NRE, 氮重吸收效率; PRE, 磷重吸收效率。CK, 对照; WTD, 水位下降。不同小写字母代表不同处理间差异显著(p < 0.05)。

Fig. 2 Leaves of Carex muliensis nutrient reabsorption efficiency and relative reabsorption efficiency of different groups (mean ± SE). NRE, nitrogen reabsorption efficiency; PRE, phosphorus reabsorption efficiency. CK, control; WTD, water level drop. Different lowercase letters indicate that there is significant difference between the two groups (p < 0.05).

图3 木里薹草叶片养分含量、重吸收效率与土壤有效养分含量的关系。NRE, 氮(N)重吸收效率; PRE, 磷(P)重吸收效率。

Fig. 3 Relationship between nutrient content, reabsorption efficiency of Carex muliensis leaves and soil effective nutrient content. NRE, nitrogen (N) reabsorption efficiency; PRE, phosphorus (P) reabsorption efficiency.

图4 木里薹草对照组叶片养分重吸收效率和养分含量、氮磷比(N:P)的Pearson相关性分析。*, p < 0.05。图中数字为相关系数。Ng, 绿叶N含量; Ng:Pg, 绿叶N:P; Ns, 枯叶N含量; Ns:Ps, 枯叶N:P; NRE, N重吸收效率; Pg, 绿叶P含量; Ps, 枯叶P含量; PRE, P重吸收效率; RR, 相对重吸收效率。

Fig. 4 Pearson correlation analysis of nutrient contents, nitrogen (N):phosphorus (P) and reabsorption efficiency in Carex muliensis leaves at control water level. *, p < 0.05. The figure is the correlation coefficient. Ng, green leaf N content; Ng:Pg, green leaf N:P; Ns, senescent leaf N content; Ns:Ps, senescent leaf N:P; NRE, N reabsorption efficiency; Pg, green leaf P content; Ps, senescent leaf P content; PRE, P reabsorption efficiency; RR, relative reabsorption efficiency.

图5 木里薹草水位下降组叶片养分重吸收效率和养分含量、氮磷比(N:P)的Pearson相关性分析。*, p < 0.05。图中数字为相关系数。Ng, 绿叶N含量; Ng:Pg, 绿叶N:P; Ns, 枯叶N含量; Ns:Ps, 枯叶N:P; NRE, N重吸收效率; Pg, 绿叶P含量; Ps, 枯叶P含量; PRE, P重吸收效率; RR, 相对重吸收效率。

Fig. 5 Pearson correlation analysis of nutrient contents, nitrogen (N):phosphorus (P) and reabsorption efficiency in Carex muliensis leaves at water level drop. *, p < 0.05. The figure is the correlation coefficient. Ng, green leaf N content; Ng:Pg, green leaf N:P; Ns, senescent leaf N content; Ns:Ps, senescent leaf N:P; NRE, N reabsorption efficiency; Pg, green leaf P content; Ps, senescent leaf P content; PRE, P reabsorption efficiency; RR, relative reabsorption efficiency.

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水位下降对若尔盖高寒草本沼泽木里薹草氮磷重吸收的影响

Effect of water level drop on nitrogen and phosphorus reabsorption of Carex muliensis in a herb swamp in Zoigê wetland, China

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