湿地芦苇植株氮素分布动态特征分析

doi:10.3773/j.issn.1005-264x.2008.04.014

摘要/Abstract

摘要：

湿地植物组织器官氮素变化是湿地氮循环的一个重要环节。对盘锦湿地芦苇(Phragmites australis)植株整个生长季地上和地下不同器官的含氮量进行分析, 结果表明: 芦苇不同器官(叶片、茎秆、根须、根茎)的含氮量差异显著, 总体表现为叶片>茎秆>根须>根茎, 地上器官的含氮量大于地下器官, 且各器官含氮量的高值出现在生育前期。生长期叶片含氮量与累积叶面积指数呈负相关关系, 而成熟期叶片含氮量与叶面积指数呈负相关关系; 根茎含氮量随土壤深度的增加而增加; 根系含氮量与生物量呈线性关系。整个生长季芦苇群落氮库随生长进程逐渐增大, 2005年芦苇地上冠层和地下30 cm以上的氮储量分别为25.76和24.04 g·m^-2。

关键词: 芦苇, 含氮量, 氮储量, 动态

Abstract:

Aims We analyzed nitrogen content of Phragmites australis in relation to leaf area index, biomass, etc., as well as seasonal dynamics in growth parameters and nitrogen content and their relationship to stability of P. australis in Panjin wetland, China.

MethodsWe sampled plots to determine biomass (dry matter) and nitrogen content of different organs of P. australis during the growing season of 2005. Nitrogen content was measured by the methods of Bao (2000).

Important findingsThe nitrogen contents in different organs of P. australis were remarkably different, with leaf > stem > fibre > rhizomes and with aboveground parts > belowground parts. Maximum values of all organs appeared in earlier stages of growth. Plant nitrogen content and leaf nitrogen content closely fit a negative linear relationship with accumulative leaf area index. Stem nitrogen content increased with increasing soil depth, and the fibre nitrogen content had a close negative linear relationship with its biomass. Total plant nitrogen storage by P. australis in Panjin wetland was crescent with its development during the growing season. Nitrogen reserves in aboveground and underground parts (0-30 cm soil depth) were 25.76 and 24.04 g·m^-2, respectively.

Key words: Phragmites australis, nitrogen content, nitrogen store, dynamics

贾庆宇, 周广胜, 周莉, 谢艳兵. 湿地芦苇植株氮素分布动态特征分析. 植物生态学报, 2008, 32(4): 858-864. DOI: 10.3773/j.issn.1005-264x.2008.04.014

JIA Qing-Yu, ZHOU Guang-Sheng, ZHOU Li, XIE Yan-Bin. DYNAMICS OF NITROGEN CONTENT OF PHRAGMITES AUSTRALISIN PANJIN WETLAND, CHINA. Chinese Journal of Plant Ecology, 2008, 32(4): 858-864. DOI: 10.3773/j.issn.1005-264x.2008.04.014

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链接本文: https://www.plant-ecology.com/CN/10.3773/j.issn.1005-264x.2008.04.014

https://www.plant-ecology.com/CN/Y2008/V32/I4/858

图/表 7

表1 芦苇植物各个器官氮含量的季节变化(%)

Table 1 Seasonal variations of different organs’ nitrogen contents of Phragmites australis (%)

	4月 April	5月 May	6月 June	9月 September	总平均值 Total average	标准偏差 SD
叶片 Leaf	刚发芽 Just germination	4.21	3.05	3.68	3.65	0.58
茎秆 Stem	刚发芽 Just germination	2.70	1.31	1.52	1.84	0.75
根须 Fibre	1.23	1.08	0.92	0.90	1.03	0.10
根茎 Rhizome	0.83	0.78	0.57	0.55	0.68	0.13

图1 芦苇冠层含氮量的垂直分层

Fig. 1 Vertical distributions of canopy nitrogen contents of Phragmites australis

表2 芦苇叶片含氮量与叶面积指数分布

Table 2 Distributions of leaf nitrogen content and leaf area index of Phragmites australis

	垂直分层 Vertical stratification (cm)	叶面积指数 Leaf area index	垂直分层 Vertical stratification (cm)	累积叶面积指数 Accumulative leaf area index (m²·m^-2)
叶片含氮量 Leaf nitrogen content	6月 June
2.49	0~40	0.01	0~240	2.43
2.20	40~80	0.21	40~240	2.42
3.07	80~120	0.47	80~240	2.21
3.20	120~160	0.72	120~240	1.74
3.52	160~200	0.72	160~240	1.02
3.84	200~240	0.30	200~240	0.30
	9月 September
3.18	150~200	0.21	150~350	1.52
4.75	200~250	0.76	200~350	1.31
3.74	250~300	0.46	250~350	0.55
3.05	300~350	0.09	300~350	0.09

图2 芦苇根系含氮量垂直分布

Fig. 2 Vertical distributions of root nitrogen contents of Phragmites australis

图3 芦苇根系含氮量的动态分布

Fig. 3 Dynamical distributions of root nitrogen content of Phragmites australis

图4 芦苇根系生物量与含氮量的关系

Fig. 4 Relationship between living root biomass and its nitrogen content of Phragmites australis

图5 芦苇生长季氮储量动态

Fig. 5 Changes in nitrogen storages in different parts of Phragmites australis

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