Si and N stoichiometry and homeostasis characteristics of Phragmites australis in desert oasis

doi:10.7522/j.issn.1000-694X.2024.00105

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (2): 166-175.DOI: 10.7522/j.issn.1000-694X.2024.00105

Si and N stoichiometry and homeostasis characteristics of Phragmites australis in desert oasis

Jianjun Kang¹(), Dongmei Zhang¹(), Liwen Zhao¹, Fan Yang²

^1.Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands / Linze Inland River Basin Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.Gansu Desert Control Research Institute，Lanzhou 730070，China

Received:2024-07-11 Revised:2024-11-08 Online:2025-03-20 Published:2025-03-26
Contact: Dongmei Zhang

Abstract

Abstract:

The developmental characteristics and regularity of Phragmites australis populations are significantly influenced by environmental changes in desert oases， resulting in unique stoichiometric characteristics of silicon （Si） and nitrogen （N）. This article takes five types of P. australis landscape habitats （sand dune， desert steppe， interdune lowland， saline grassland， and wetland） in the desert oasis of the Hexi Corridor as the research objects to explore the stoichiometry and homeostasis characteristics of Si and N in P. australis. The results indicated that there were significant differences in soil Si content and Si/N， as well as Si and N content and Si/N in different growth stages and organs of P. australis. P. australis Si （SiO₂） and soil Si （SiO₂） contents were both high， but soil available Si （H₄SiO₄） content was low， resulting in relatively low Si/N of P. australis， and the growth of P. australis was limited by Si. There were significant positive correlations between Si and N content， Si/N and soil Si， N content， Si/N， as well as groundwater depth， and no correlation was observed with groundwater Si， N content， and Si/N in the five habitats， and there was a certain degree of synergy and stability in the coupling effect of Si and N nutrients in P. australis. Si， N， and Si/N of reed in different habitats had high homeostasis， and the homeostasis of Si/N in P. australis was higher than that of the element itself （HI_Si/N>HI_Si>HI_N>4）. Compared with Si and N nutrition， Si/N in P. australis was less affected by the external environment， and the growth process of P. australis regulated the nutrient supply according to a certain Si and N absorption ratio.

Key words: desert oasis, Phragmites australis, landscape habitats, Si and N stoichiometry, homeostasis

CLC Number:

S153

Jianjun Kang, Dongmei Zhang, Liwen Zhao, Fan Yang. Si and N stoichiometry and homeostasis characteristics of Phragmites australis in desert oasis[J]. Journal of Desert Research, 2025, 45(2): 166-175.

Figures/Tables 8

References 41

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项目	生境
项目	湿地W 0~0.2 m（泥炭层）	盐化草地SM 0~1.0 m	草滩DT 0~2.5 m	丘间低地IL 0~2.5 m	沙丘SD 0~2.5 m
地下水埋深/m	0	0.90±0.06	1.70±0.24	2.30±0.28	6.00±0.37
土壤类型	积水、土壤泥炭发育	土壤表层盐分积累	沙质壤土	风沙土	风沙土
芦苇生态类型	水生芦苇	盐化芦苇	过渡带芦苇	过渡带芦苇	沙丘芦苇

项目	生境
项目	湿地W 0~0.2 m（泥炭层）	盐化草地SM 0~1.0 m	草滩DT 0~2.5 m	丘间低地IL 0~2.5 m	沙丘SD 0~2.5 m
地下水埋深/m	0	0.90±0.06	1.70±0.24	2.30±0.28	6.00±0.37
土壤类型	积水、土壤泥炭发育	土壤表层盐分积累	沙质壤土	风沙土	风沙土
芦苇生态类型	水生芦苇	盐化芦苇	过渡带芦苇	过渡带芦苇	沙丘芦苇

生育期	生境	器官												总量
		穗		叶		茎秆		地下垂直茎		地下水平茎		根系		总量
		Si	N	Si	N	Si	N	Si	N	Si	N	Si	N	Si	N
返青期	沙丘SD	—	—	0.65^c	3.24^c	0.62^a	2.57^c	0.63^c	0.60^b	1.07^a	0.69^a	0.47^bc	1.10^a	3.44^a	8.20^bc
	草滩DT	—	—	0.94^b	2.99^c	0.37^c	2.60^c	1.03^a	0.30^d	0.82^b	0.53^b	0.51^b	0.94^b	3.67^a	7.3^6c
	丘间低地IL	—	—	0.24^d	3.69^b	0.29^d	3.41^b	0.61^c	0.42^c	0.73^c	0.54^b	0.59^ab	1.06^a	2.46^c	9.12^b
	盐化草地SM	—	—	0.88^b	2.41^d	0.49^b	1.88^d	0.70^b	0.34^d	0.41^d	0.21^c	0.66^a	0.34^c	3.14^ab	5.18^d
	湿地W	—	—	1.06^a	4.29^a	0.54^b	3.89^a	0.36^d	0.70^a	0.37^de	0.50^b	0.42^c	1.01^ab	2.75^b	10.39^a
拔节期	沙丘SD	—	—	1.01^d	2.69^a	1.04^a	1.42^a	0.51^d	0.69^a	1.29^a	0.42^b	0.52^b	0.49^d	4.37^a	5.71^a
	草滩DT	—	—	1.32^bc	2.55^b	0.83^b	0.77^c	1.09^a	0.29^c	0.82^c	0.21^c	0.56^b	0.62^b	4.62^a	4.44^b
	丘间低地IL	—	—	0.67^e	2.15^c	0.54^c	0.44^d	0.62^c	0.17^d	0.94^b	0.17^d	0.63^a	0.52^c	3.40^c	3.45^c
	盐化草地SM	—	—	1.43^b	2.66^ab	0.82^b	1.39^a	0.77^b	0.65^a	0.47^d	0.39^b	0.73^a	0.58^bc	4.22^ab	5.67^a
	湿地W	—	—	1.81^a	2.82^a	0.79^b	0.98^b	0.42^e	0.57^b	0.36^e	0.76^a	0.51^b	0.87^a	3.89^b	6.00^a
抽穗期	沙丘SD	0.29^c	0.52^a	1.58^b	1.13^a	1.03^b	0.77^b	1.39^a	0.61^b	1.13^b	0.50^c	0.61^c	0.42^b	6.03^a	3.95^a
	草滩DT	0.25^d	0.43^b	1.17^c	1.03^ab	1.12^b	0.70^c	0.78^c	0.50^c	1.65^a	0.79^a	0.70^b	0.40^b	5.67^a	3.85^ab
	丘间低地IL	0.30^c	0.45^b	0.91^d	0.95^b	0.70^c	0.53^d	0.85^bc	0.63^b	1.01^b	0.70^b	0.92^a	0.52^a	4.69^b	3.78^b
	盐化草地SM	0.40^b	0.54^a	1.70^b	1.14^a	1.36^a	0.86^a	0.96^b	0.73^a	0.52^c	0.44^d	0.85^ab	0.49^ab	5.79^a	4.20^a
	湿地W	0.47^a	0.50^a	2.47^a	1.18^a	1.09^b	0.67^c	0.31^d	0.33^d	0.41^d	0.36^e	0.61^c	0.55^a	5.36^ab	3.59^c
枯黄期	沙丘SD	1.42^b	1.41^a	1.23^d	1.53^a	1.37^bc	0.46^b	1.06^a	0.53^a	1.13^a	0.45^a	0.88^a	0.53^b	7.09^b	4.92^a
	草滩DT	1.54^b	0.96^b	1.36^d	1.17^b	1.23^c	0.34^c	0.98^a	0.31^c	0.89^b	0.36^b	0.77^b	0.62^a	6.77^b	3.77^b
	丘间低地IL	1.09^c	0.82^c	1.88^c	1.47^ab	1.03^d	0.41^bc	0.36^c	0.42^bc	0.83^b	0.38^b	0.53^c	0.39^c	5.72^c	3.90^b
	盐化草地SM	1.58^ab	1.31^a	2.44^b	1.52^a	1.80^a	0.52^a	0.62^b	0.45^b	0.51^c	0.47^a	0.78^b	0.62^a	7.73^ab	4.89^a
	湿地W	1.75^a	0.73^d	3.59^a	1.58^a	1.48^b	0.36^c	0.38^c	0.35^c	0.38^d	0.34^b	0.54^c	0.53^b	8.12^a	3.89^b

生育期	生境	器官												总量
		穗		叶		茎秆		地下垂直茎		地下水平茎		根系		总量
		Si	N	Si	N	Si	N	Si	N	Si	N	Si	N	Si	N
返青期	沙丘SD	—	—	0.65^c	3.24^c	0.62^a	2.57^c	0.63^c	0.60^b	1.07^a	0.69^a	0.47^bc	1.10^a	3.44^a	8.20^bc
	草滩DT	—	—	0.94^b	2.99^c	0.37^c	2.60^c	1.03^a	0.30^d	0.82^b	0.53^b	0.51^b	0.94^b	3.67^a	7.3^6c
	丘间低地IL	—	—	0.24^d	3.69^b	0.29^d	3.41^b	0.61^c	0.42^c	0.73^c	0.54^b	0.59^ab	1.06^a	2.46^c	9.12^b
	盐化草地SM	—	—	0.88^b	2.41^d	0.49^b	1.88^d	0.70^b	0.34^d	0.41^d	0.21^c	0.66^a	0.34^c	3.14^ab	5.18^d
	湿地W	—	—	1.06^a	4.29^a	0.54^b	3.89^a	0.36^d	0.70^a	0.37^de	0.50^b	0.42^c	1.01^ab	2.75^b	10.39^a
拔节期	沙丘SD	—	—	1.01^d	2.69^a	1.04^a	1.42^a	0.51^d	0.69^a	1.29^a	0.42^b	0.52^b	0.49^d	4.37^a	5.71^a
	草滩DT	—	—	1.32^bc	2.55^b	0.83^b	0.77^c	1.09^a	0.29^c	0.82^c	0.21^c	0.56^b	0.62^b	4.62^a	4.44^b
	丘间低地IL	—	—	0.67^e	2.15^c	0.54^c	0.44^d	0.62^c	0.17^d	0.94^b	0.17^d	0.63^a	0.52^c	3.40^c	3.45^c
	盐化草地SM	—	—	1.43^b	2.66^ab	0.82^b	1.39^a	0.77^b	0.65^a	0.47^d	0.39^b	0.73^a	0.58^bc	4.22^ab	5.67^a
	湿地W	—	—	1.81^a	2.82^a	0.79^b	0.98^b	0.42^e	0.57^b	0.36^e	0.76^a	0.51^b	0.87^a	3.89^b	6.00^a
抽穗期	沙丘SD	0.29^c	0.52^a	1.58^b	1.13^a	1.03^b	0.77^b	1.39^a	0.61^b	1.13^b	0.50^c	0.61^c	0.42^b	6.03^a	3.95^a
	草滩DT	0.25^d	0.43^b	1.17^c	1.03^ab	1.12^b	0.70^c	0.78^c	0.50^c	1.65^a	0.79^a	0.70^b	0.40^b	5.67^a	3.85^ab
	丘间低地IL	0.30^c	0.45^b	0.91^d	0.95^b	0.70^c	0.53^d	0.85^bc	0.63^b	1.01^b	0.70^b	0.92^a	0.52^a	4.69^b	3.78^b
	盐化草地SM	0.40^b	0.54^a	1.70^b	1.14^a	1.36^a	0.86^a	0.96^b	0.73^a	0.52^c	0.44^d	0.85^ab	0.49^ab	5.79^a	4.20^a
	湿地W	0.47^a	0.50^a	2.47^a	1.18^a	1.09^b	0.67^c	0.31^d	0.33^d	0.41^d	0.36^e	0.61^c	0.55^a	5.36^ab	3.59^c
枯黄期	沙丘SD	1.42^b	1.41^a	1.23^d	1.53^a	1.37^bc	0.46^b	1.06^a	0.53^a	1.13^a	0.45^a	0.88^a	0.53^b	7.09^b	4.92^a
	草滩DT	1.54^b	0.96^b	1.36^d	1.17^b	1.23^c	0.34^c	0.98^a	0.31^c	0.89^b	0.36^b	0.77^b	0.62^a	6.77^b	3.77^b
	丘间低地IL	1.09^c	0.82^c	1.88^c	1.47^ab	1.03^d	0.41^bc	0.36^c	0.42^bc	0.83^b	0.38^b	0.53^c	0.39^c	5.72^c	3.90^b
	盐化草地SM	1.58^ab	1.31^a	2.44^b	1.52^a	1.80^a	0.52^a	0.62^b	0.45^b	0.51^c	0.47^a	0.78^b	0.62^a	7.73^ab	4.89^a
	湿地W	1.75^a	0.73^d	3.59^a	1.58^a	1.48^b	0.36^c	0.38^c	0.35^c	0.38^d	0.34^b	0.54^c	0.53^b	8.12^a	3.89^b

项目	效应	平方和	自由度df	均方	F	P
Si	截距	286.565	1	1 026.783	819.154	0.000^**
	生境(A)	155.651	1	153.254	96.254	0.000^**
	生育期(B)	14.520	1	52.125	50.232	0.000^**
	器官(C)	4.125	1	7.231	28.930	0.000^**
	A×B	24.512	2	24.532	24.542	0.000^**
	A×C	2.235	1	1.854	5.672	0.000^**
	B×C	12.254	1	12.500	10.468	0.000^**
	A×B×C	25.670	2	24.560	15.680	0.000^**
	误差	37.520	24	1.563
	合计	1 548.000	32
N	截距	212.256	1	678.776	417.180	0.000^**
	生境(A)	125.439	1	121.276	65.276	0.000^**
	生育期(B)	10.531	1	35.170	25.234	0.000^**
	器官(C)	3.165	2	5.225	21.965	0.000^**
	A×B	17.532	1	18.51	19.556	0.000^**
	A×C	2.265	2	1.450	4.630	0.000^**
	B×C	10.150	1	10.180	7.451	0.000^**
	A×B×C	20.361	1	16.512	11.663	0.000^**
	误差	30.558	16	1.340
	合计	1 135.400	22
Si/N	截距	367.835	1	788.796	312.150	0.000^**
	生境(A)	198.670	1	144.350	55.250	0.000^**
	生育期(B)	20.650	2	49.148	29.279	0.000^**
	器官(C)	6.120	1	6.280	20.663	0.000^**
	A×B	28.610	2	22.58	17.576	0.000^**
	A×C	2.851	2	1.865	5.750	0.000^**
	B×C	16.274	1	13.254	6.486	0.000^**
	A×B×C	27.685	1	19.750	10.691	0.000^**
	误差	34.512	27	1.680
	合计	1 426.600	36

Si and N stoichiometry and homeostasis characteristics of Phragmites australis in desert oasis

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生境	土壤				地下水
生境	含水量/%	N含量/%	Si含量/%	Si/N	Si含量/%	N含量/%	Si/N
沙丘SD（0~2.5 m）	3.2^d	0.0008^a	0.07^cd	87.50^d	0.00026^ab	0.00031^ab	0.84^ab
丘间低地IL（0~2.5 m）	10.4^c	0.0005^a	0.09^c	185.71^b	0.00027^a	0.00030^ab	0.90^a
草滩DT（0~2.5 m）	17.3^b	0.0007^a	0.13^b	180.00^b	0.00027^a	0.00036^a	0.75^b
盐化草地SM（0~1.0 m）	22.7^a	0.0006^a	0.19^a	316.67^a	0.00029^a	0.00032^a	0.91^a
湿地W（0~0.2 m）	—	0.0007^a	0.10^bc	142.86^c	0.00028^a	0.00033^a	0.85^a

	土壤Si	土壤N	土壤 Si/N	地下水埋深	芦苇 Si	芦苇 N	芦苇 Si/N	地下水 Si	地下水 N	地下水 Si/N
土壤Si	—
土壤N	-0.32	—
土壤Si/N	0.90^*	-0.58^*	—
地下水埋深	-0.60^*	0.35	-0.56^*	—
芦苇Si	0.55^*	0.49^*	0.15	0.67^*	—
芦苇N	0.23	0.29	0.18	0.46^*	0.51^*	—
芦苇Si/N	0.09	0.22	-0.06	0.54^*	0.61^*	-0.56^*	—
地下水Si	0.24	-0.12	0.54^*	-0.13	0.15	0.08	0.37	—
地下水N	-0.24	-0.18	0.05	-0.10	-0.14	-0.29	-0.17	0.11	—
地下水Si/N	0.18	0.45	0.43	-0.36	0.20	0.28	0.35	0.44^*	-0.74^*	—

生境	指标	内稳定性指数	R²	P	是否稳态
沙丘 SD	Si	6.55	0.22	0.03	稳态型
	N	5.61	0.16	0.02	稳态型
	Si/N	7.79	0.13	0.04	稳态型
草滩 DT	Si	5.56	0.19	0.03	稳态型
	N	4.94	0.10	0.03	稳态型
	Si/N	6.21	0.20	0.04	稳态型
丘间低地 IL	Si	4.78	0.11	0.02	稳态型
	N	5.36	0.27	0.02	稳态型
	Si/N	5.98	0.31	0.04	稳态型
盐化草地 SM	Si	6.21	0.17	0.03	稳态型
	N	5.05	0.22	0.03	稳态型
	Si/N	7.87	0.13	0.04	稳态型
湿地 W	Si	7.30	0.26	0.02	稳态型
	N	6.23	0.29	0.04	稳态型
	Si/N	9.46	0.15	0.03	稳态型

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