DYNAMICS OF NITROGEN CONTENT OF PHRAGMITES AUSTRALISIN PANJIN WETLAND, CHINA

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

Abstract

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

JIA Qing-Yu, ZHOU Guang-Sheng, ZHOU Li, XIE Yan-Bin. DYNAMICS OF NITROGEN CONTENT OF PHRAGMITES AUSTRALISIN PANJIN WETLAND, CHINA[J]. Chin J Plant Ecol, 2008, 32(4): 858-864.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.04.014

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

Figures/Tables 7

References 17

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	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

	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

	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

	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