Analysis of Biomass Allocation and Stoichiometric Characteristics of Bidens alba in the Nanliu River Basin

doi:10.7525/j.issn.1673-5102.2024.06.006

Abstract

Abstract:

Patterns of biomass allocation and stoichiometric characteristics offer significant insights into the expansion capacity and environmental adaptability of invasive plants. This study focused on the typical invasive plant Bidens alba L. in the riverbank area of Nanliu River， Guangxi. Based on the invasion coverage， five levels of invasion were categorized： minimal（≤15%）， mild（15% to 30%）， moderate（30% to 45%）， severe（45% to 60%）， and extremely severe（>60%）. The biomass allocation patterns， C∶N∶P stoichiometric characteristics， and the soil physicochemical properties of B. alba were comprehensively analyzed under different invasion levels， so as to explore and clarify the adaptation strategies and expansion mechanisms of B. alba. The results indicated that：（1）There was no significant difference in the biomass allocation of B. alba roots under different invasion levels（P>0.05）. Under severe and extremely severe invasions， the biomass allocation of stems significantly decreased（P<0.05）， while the biomass allocation of leaves significantly increased（P<0.05）. The average root-to-shoot ratio was not significantly different（P>0.05）. （2）As the level of invasion increased， the N and P contents in roots， stems， and leaves significantly increased（P<0.05）. The average N and P contents in leaves were 20.88 and 3.92 g?kg^-1， respectively. （3）The C∶N and C∶P in roots， stems， and leaves significantly decreased with the increase of invasion levels（P<0.05）， while the change trend of N∶P was not significant. The average values of C∶N， C∶P and N∶P in the leaves were 21.06， 118.30 and 5.49， respectively. （4）The invasion levels of B. alba were significantly positively correlated with the N and P contents in roots， stems， and leaves， as well as the C， N and P contents in soil（P<0.05）. In summary， as the level of invasion increased， the resource allocation strategy of B. alba was optimized by increasing leaf biomass and leaf N and P contents， and soil C， N and P contents by interaction with soil to form a soil environment conducive to its rapid invasion.

Key words: invasion level, biomass allocation, ecological stoichiometric characteristics, Bidens alba, Nanliu River Basin

CLC Number:

Q948.1

Xiongzhong MA, Weihong XIONG, Zhe SUN. Analysis of Biomass Allocation and Stoichiometric Characteristics of Bidens alba in the Nanliu River Basin[J]. Bulletin of Botanical Research, 2024, 44(6): 852-862.

Figures/Tables 6

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Table 1

Table 2

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因变量 Variable	器官 Organ		入侵程度 Invasion level		器官×入侵程度 Organ×invasion level
因变量 Variable	F	P	F	P	F	P
C	42.71	<0.001	9.63	<0.001	9.02	<0.001
N	1 791.60	<0.001	97.62	<0.001	25.86	<0.001
P	180.90	<0.001	167.37	<0.001	6.62	<0.001
C∶N	507.48	<0.001	71.68	<0.001	11.58	<0.001
C∶P	73.49	<0.001	144.73	<0.001	12.14	<0.001
N∶P	6 730.36	<0.001	424.29	<0.001	33.59	<0.001

因变量 Variable	器官 Organ	入侵程度 Invasion level					F	P
因变量 Variable	器官 Organ	微度 Minimal	轻度 Mild	中度 Moderate	重度 Severe	极重度 Extremely severe	F	P
C	根 Root	Ab	Aa	Ab	Aa	Bb	19.502	<0.001
	茎 Stem	Bb	Cb	Aab	Ba	Bab	5.378	0.002
	叶 Leaf	Aa	Ba	Aa	Ba	Aa	2.779	0.045
	F	5.714	45.926	2.215	8.389	16.529
	P	0.008	<0.001	0.127	0.001	<0.001
N	根 Root	Bb	Bb	Bb	Bab	Ba	5.626	0.002
	茎 Stem	Bc	Bbc	Bb	Bab	Ba	14.452	<0.001
	叶 Leaf	Ac	Ab	Ab	Aa	Aa	129.260	<0.001
	F	113.253	370.264	362.658	527.526	521.336
	P	<0.001	<0.001	<0.001	<0.001	<0.001
P	根 Root	Bb	Cb	Ca	Ca	Ca	23.686	<0.001
	茎 Stem	Bc	Bb	Bb	Ba	Ba	78.306	<0.001
	叶 Leaf	Ac	Ab	Ab	Aa	Aa	78.617	<0.001
	F	13.122	38.188	27.067	72.921	56.080
	P	<0.001	<0.001	<0.001	<0.001	<0.001
C∶N	根 Root	Ba	Aa	Aa	Ab	Ab	24.832	<0.001
	茎 Stem	Aa	Ab	Bc	Acd	Ad	66.176	<0.001
	叶 Leaf	Ca	Bab	Cab	Bb	Bb	3.834	0.012
	F	182.043	150.873	102.817	75.144	42.918
	P	<0.001	<0.001	<0.001	<0.001	<0.001
C∶P	根 Root	Ba	Ab	Ac	Ac	Ac	48.828	<0.001
	茎 Stem	Aa	Bb	Bb	Bb	Ab	104.774	<0.001
	叶 Leaf	Ca	Bb	Bb	Bb	Bb	15.400	<0.001
	F	67.876	31.697	7.681	9.400	5.383
	P	<0.001	<0.001	0.002	0.001	0.010
N∶P	根 Root	Ba	Bb	Bd	Bcd	Bc	139.145	<0.001
	茎 Stem	Ba	Cc	Cbc	Cc	Cb	224.493	<0.001
	叶 Leaf	Aa	Ab	Ac	Ad	Acd	127.818	<0.001
	F	1 034.009	1 856.272	1 619.103	1 123.713	1 231.604
	P	<0.001	<0.001	<0.001	<0.001	<0.001

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