Effects of Invasive Plant Datura stramonium on the Functional Traits of Native Plants and the Stoichiometric Characteristics of Soil Carbon, Nitrogen and Phosphorus

doi:10.7525/j.issn.1673-5102.2020.06.009

Abstract

Abstract:

The experiment was conducted to explore effects of invasive plants under the different pressures of invasion on the functional traits of native plants and the stoichiometric characteristics of soil carbon， nitrogen and phosphorus. We used invasive plant Datura stramonium and coexisting native plants as the research object， researches species， number and height of plants in sample plots and the species diversity of native plant communities with no invasion， low invasion and heavy invasion（according to the proportion of invasive plants coverage）， and analyzed the specific leaf area， carbon content， nitrogen content， carbon to nitrogen ratio， leaf construction cost and carbon， nitrogen and phosphorus stoichiometric characteristics in different soil layers. With the increase of invasion pressure， the species richness and the number of native plants decreased gradually. The plant height and leaf nitrogen content of D.stramonium were significantly higher than that of native plants under different invasion pressures， and gradually increased with the increase of invasion pressure. The carbon to nitrogen ratio was significantly lower than that of native plants in sample plots with no invasion. The specific leaf area， carbon content and leaf construction cost were not significantly different from those of native plants in sample plots with invasion. With the increase of invasion pressure， soil total nitrogen content， total carbon content， nitrogen to phosphorus ratio and carbon to phosphorus ratio increased significantly， while total phosphorus content and carbon to nitrogen ratio decreased significantly. Soil carbon and nitrogen stoichiometric characteristics show a certain surface clustering effect. These results show that D.stramonium has a high resource capture ability， and has changed the characteristics of soil， so as to enhance its own competitiveness to improve the invasion ability， which may be one of the reasons for the successful invasion of D.stramonium.

Key words: invasive plants, Datura stramonium, coexisting local plant, functional traits, stoichiometric characteristics

CLC Number:

Q949.777.7

Ke-Xin MA, Mei ZHANG, Xin FANG, Li-Li TANG, Jian-Hua HAN, Li-Fang YANG, Fu-Chen SHI. Effects of Invasive Plant Datura stramonium on the Functional Traits of Native Plants and the Stoichiometric Characteristics of Soil Carbon, Nitrogen and Phosphorus[J]. Bulletin of Botanical Research, 2020, 40(6): 867-875.

Figures/Tables 5

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科 Family	无入侵区本地植物 Native species in sample plots with no invasion	轻度入侵区本地植物 Native species in sample plots with low invasion	重度入侵区本地植物 Native species in sample plots with heavy invasion
茄科Solanaceae		曼陀罗Datura stramonium(7)	曼陀罗Datura stramonium(23)
菊科Compositae	刺儿菜Cirsium setosum(2)	刺儿菜Cirsium setosum(8)	鬼针草Bidens pilosa(13)
	苍耳Xanthium sibiricum(8)	苍耳Xanthium sibiricum(5)
	苣荬菜Sonchus arvensis(10)	苣荬菜Sonchus arvensis(5)
	蓟Cirsium japonicum(12)	鬼针草Bidens pilosa(2)
	茵陈蒿Artemisia capillaris(5)	青蒿Artemisia carvifolia(2)
		紫花山莴苣Mulgedium tataricum(5)
禾本科Poaceae	狗尾草Setaria viridis(30)	狗尾草Setaria viridis(58)	狗尾草Setaria viridis(32)
	虎尾草Chloris virgate(237)	马唐Digitaria sanguinalis(25)	虎尾草Chloris virgate(42)
	稗Echinochloa crusgalli(2)		稗Echinochloa crusgalli(25)
	长芒稗Echinochloa caudata(8)		长芒稗Echinochloa caudata(5)
	马唐Digitaria sanguinalis(12)
	芦苇Phragmites australis(117)
	稷Panicum miliaceum(3)
藜科Chenopodiaceae	藜Chenopodium album(21)	藜Chenopodium album(3)	藜Chenopodium album(6)
	地肤Kochia scoparia(5)	地肤Kochia scoparia(7)	地肤Kochia scoparia(12)
	碱蓬Suaeda glauca(63)		猪毛菜Salsola collina(2)
锦葵科Malvaceae	苘麻Abutilon theophrasti(8)	苘麻Abutilon theophrasti(3)	苘麻Abutilon theophrasti(7)
	野西瓜苗Hibiscus trionum(3)
豆科Leguminosae	野大豆Glycine soja(13)	野大豆Glycine soja(8)
	草木樨Melilotus officinalis(2)
萝藦科Asclepiadaceae	鹅绒藤Cynanchum chinense(3)	萝藦Metaplexis japonica(2)
桑科Moraceae	葎草Humulus scandens(2)		葎草Humulus scandens(3)
马齿苋科Portulacaceae	马齿苋Portulaca oleracea(3)

指标 Index	入侵压力 Degree of invasion	土层深度 Soil depth	入侵压力×土层深度 Degree of invasion× Soil depth
SN	22.204 9^**	7.877 0^*	0.057 4
SC	5.300 2^*	5.096 9^*	0.093 0
SP	14.909 2^**	1.192 6	0.153 2
N∶P	80.767 9^**	7.618 8^*	0.306 5
C∶N	6.408 3^*	1.221 3	0.736 1
C∶P	33.021 8^**	2.539 2	0.107 6

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