Analysis of Biomass Allocation and Stoichiometric Characteristics of Bidens alba in the Nanliu River Basin
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.
invasion levelbiomass allocationecological stoichiometric characteristicsBidens albaNanliu River Basin
万方数据
维普
