Responses of Leaf and Fine Root Functional Traits of Alternanthera philoxeroides to Heterogeneous Habitats

doi:10.7525/j.issn.1673-5102.2024.03.010

Abstract

Abstract:

Functional traits of the leaf and fine root play an important role in plant invasion. It was of great significance for understanding the biological invasion mechanism to investigate the differences and connections between the functional traits of leaf and fine root functional traits and to illustrate the responses of plants parts above and below ground to heterogeneous habitats. In this research， 20 functional traits in leaves and fine roots of Alternanthera philoxeroides in three habitats（xeric， wet， and aquatic） were measured and their differences and correlations in different habitats were analyzed by field investigation methods. The results indicated that：（1）There were significant differences（P<0.05） in plant functional traits among the three habitats， with the largest differences in leaf fresh weight（（1.12±0.14） g）， leaf area（（4.80±0.57） cm²）， and leaf volume（（1.12±0.16） cm³） in the xeric habitat， while the ratio of leaf length to width（2.95±0.22） and root tissue density （（4.14±0.52） g·cm^-3） in aquatic habitat， respectively. （2）A. philoxeroides had the highest coefficient of variation in leaf relative water content（0.603） in hydric habitat， while the lowest coefficient of variation for the ratio of leaf length to width（0.057）. In addition， it had the highest coefficient of variation for root branch number（0.453） in xeric habitat and the lowest coefficient of variation for root average diameter（0.065）. （3）Similar to leaf， fine root traits were closely related， but there were less related between root and leaf traits. （4）A. philoxeroides preferred the acquisitive strategy（high input-low return） in the xeric habitat， while it preferred the resource conservative strategy（low input-high return） in the wet and aquatic habitats.

Key words: Alternanthera philoxeroides, functional traits, invasive plant, heterogeneous habitat, ecological strategy

CLC Number:

Q948.8

Yandong JIANG, Zhengdong PENG, Qi XU, Wanyi GAN, Liujing HUANG. Responses of Leaf and Fine Root Functional Traits of Alternanthera philoxeroides to Heterogeneous Habitats[J]. Bulletin of Botanical Research, 2024, 44(3): 410-419.

Figures/Tables 6

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样地编号 Sample plot number	北纬度 Northern latitude	东经度 East longitude	生境类型 Habitat types	环境特征 Environment characteristic
H1	26°1′44″	119°14′32″	旱生 Xeric	光照强，土壤表面干燥，水分条件较差 High sunshine，dry soil surface and poor moisture conditions
H2	26°1′31″	119°14′42″
H3	26°1′2″	119°15′45″
SH1	26°3′21″	119°10′41″	湿生 Wet	光照强，土壤表面少量积水，水分条件充足 High sunshine，a small amount of water on the soil surface，adequate moisture
SH2	26°3′21″	119°10′34″
SH3	26°4′7″	119°10′48″
S1	26°3′19″	119°10′52″	水生 Aquatic	光照强，土壤全部没于水中，水分条件充足 High sunshine，the soil was completely submerged in water，adequate moisture
S2	26°2′37″	119°11′31″
S3	26°1′53″	119°12′7″

器官 Organ	功能性状 Functional traits	英文缩写 English abbreviation	计算公式 A formula to calculate
叶 Leaf	叶鲜质量Leaf fresh weight	LFW
	叶生物量Leaf biomass	LB
	叶厚度Leaf thickness	LT
	叶体积Leaf volume	LV	叶厚度×叶面积Leaf thickness×leaf area
	叶面积leaf area	LA
	比叶面积Specific leaf area	SLA	叶面积/叶干质量Leaf area/leaf dry weight
	叶干物质含量Leaf dry matter content	LDMC	叶片干质量/叶片饱和鲜质量 Leaf dry weight/leaf saturated fresh weight
	叶相对含水量Leaf relative water content	LRWC	（叶饱和质量-叶鲜质量）/（叶饱和质量-叶干质量）（leaf saturated fresh weight-leaf fresh weight）/ （leaf saturated fresh weight-leaf dry weight）
	叶组织密度Leaf tissue density	LTD	叶干质量/叶体积Leaf dry weight/leaf volume
	叶长宽比The ratio of leaf length to width	LW	叶长/叶宽Leaf length/leaf width
根 Root	根生物量Root biomass	RB
	根平均直径Root average diameter	RAD
	根长Root length	RL
	根分支数Root branch number	RBN
	根体积Root volume	RV
	根面积Root area	RA
	根组织密度Root tissue density	RTD	根体积/根干质量Root volume/root dry weight
	比根长Specific root length	SRL	根长/根干质量Root length/root dry weight
	比根面积Specific root area	SRA	根面积/根干质量Root area/root dry weight
	根分支强度Root branching intensity	RBI	分支数/根长Root branch number/root length

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