Effects of Drought Conditions on Interspecific Interactions and Growth of Bidens pilosa and Buddleja lindleyana

doi:10.7525/j.issn.1673-5102.2023.05.009

Abstract

Abstract:

In order to investigate the effects of drought on the interspecific relationship and growth of the invasive plant Bidens pilosa and the native species Buddleja lindleyana， two methods were designed： interspecific group（one plant of each of two species were planted in a pot） and baffled group（a baffle separated the two plants in the interspecific group）， and two water treatments were applied， including the drought group （30%-35% saturated moisture content） and control group（90%-100% saturated moisture content）， and plant morphological characteristics， biomass， relative growth rate， and relative neighbor effect index of each plant feature were measured respectively. The results showed that：（1）under both drought conditions， interspecific interactions promoted the root， stem， leaf， and total biomass of Bidens pilosa， whereas water availability altered the interspecific interactions of Buddleja lindleyana， with competition under the drought treatment and facilitation under the control treatment；（2）under drought conditions， interspecific interactions increased the relative growth rate and root-to-shoot ratio of Bidens pilosa root， stem， and leaf biomass， and decreased the specific leaf area and root-to-shoot ratio of Buddleja lindleyana（P<0.05）. （3）Interspecific interactions significantly promoted the growth of root length， root surface area， and root tip number in both species（P<0.05）. The results indicate that interspecific interactions promote the growth performance of Bidens pilosa under drought conditions， provid it with a competitive advantage in arid habitats， potentially as part of its invasion strategy.

Key words: interspecific interaction, drought, relative growth rate, invasive plant, Bidens pilosa

CLC Number:

Q948.1

Jiaxing CHEN, Shu WANG, Linli CHEN, Xiali HOU, Qingzhu YANG, Renya YIN. Effects of Drought Conditions on Interspecific Interactions and Growth of Bidens pilosa and Buddleja lindleyana[J]. Bulletin of Botanical Research, 2023, 43(5): 720-728.

Figures/Tables 5

Table 1

Table 2

Fig.1

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Table 3

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处理时间 Treatment duration/d	植物特征 Plant traits	水分条件 Water condition	鬼针草Bidens pilosa		醉鱼草Buddleja lindleyana
处理时间 Treatment duration/d	植物特征 Plant traits	水分条件 Water condition	相对邻株效应指数 Relative neighbor effect	种间相互作用 Interspecific interaction	相对邻株效应指数 Relative neighbor effect	种间相互作用 Interspecific interaction
40	总生物量Total biomass	对照Moist	0.211	-	0.076	-
	茎生物量Stem biomass	对照Moist	0.161	-	-0.078	+
	叶生物量Leaf biomass	对照Moist	0.202	-	0.114	-
	根生物量Root biomass	对照Moist	0.256	-	0.112	-
90	总生物量Total biomass	对照Moist	-0.057	+	-0.331	+
	总生物量Total biomass	干旱Drought	-0.291	+	0.067	-
	茎生物量Stem biomass	对照Moist	-0.009	+	-0.258	+
	茎生物量Stem biomass	干旱Drought	-0.278	+	-0.584	+
	叶生物量Leaf biomass	对照Moist	-0.092	+	0.099	-
	叶生物量Leaf biomass	干旱Drought	-0.173	+	-0.395	+
	根生物量Root biomass	对照Moist	-0.089	+	-0.424	+
	根生物量Root biomass	干旱Drought	-0.408	+	0.195	-

变异来源 Source of variance	自由度 d_f	相对生长率Relative growth rate
变异来源 Source of variance	自由度 d_f	总生物量 Total biomass	茎生物量 Stem biomass	叶生物量 Leaf biomass	根生物量 Root biomass	根冠比 Root shoot ratio	叶面积 Leaf area	比叶面积 Specific leaf area
物种（S）	1	35.369**	141.219**	134.701**	5.615*	349.062**	67.806**	41.441**
水分处理（W）	1	15.323**	2.966	26.557**	10.079*	0.053	65.391**	5.970*
种间作用（I）	1	16.353**	5.932*	11.972*	12.945*	0.735	17.244**	72.765**
S×W	1	1.817	1.856	15.130	0.027	1.210	13.731**	1.510
S×I	1	3.725	3.046	5.342*	0.915	2.359	0.224	12.976*
W×I	1	0.555	0.538	0.001	2.635	19.429**	2.091	1.102
S×W×I	1	1.631	0.231	1.011	4.097*	23.789**	8.993*	6.911*

物种 Species	种间作用 Species interaction	处理 Treatment	相对生长率 Relative growth rate/%
物种 Species	种间作用 Species interaction	处理 Treatment	根长 Root length	根平均直径 Root average diameter	根表面积 Root surface area	根尖数量 Root tip number
鬼针草 Bidens pilosa	种间组 Interspecific group	干旱Drought	2.51±1.01Aa	0.39±0.18Aa	6.94±4.45Aa	3.66±1.36Aa
	种间组 Interspecific group	对照Moist	3.38±1.32Aa	0.40±0.15Aa	8.75±4.17Aa	4.71±1.66Aa
	挡板组 Barrier group	干旱Drought	0.56±0.52Ba	0.21±0.21Aa	1.62±1.52Bb	0.75±0.52Ba
	挡板组 Barrier group	对照Moist	0.87±0.47Ba	0.34±0.11Aa	3.14±1.28Ba	1.40±0.88Ba
醉鱼草 Buddleja lindleyana	种间组 Interspecific group	干旱Drought	3.56±2.02Aa	0.28±0.13Aa	7.39±4.45Aa	4.76±2.86Aa
	种间组 Interspecific group	对照Moist	3.71±1.44Aa	0.28±0.18Aa	7.18±3.83Aa	5.73±2.85Aa
	挡板组 Barrier group	干旱Drought	1.57±1.00Ba	-0.10±0.10Ba	3.45±2.24Ba	2.22±1.34Ba
	挡板组 Barrier group	对照Moist	1.14±0.84Ba	-0.13±0.10Ba	1.90±1.77Ba	3.28±1.77Ba

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