# 入侵植物相关指标计算方法

By王从彦

Pi = ni / N

IRI = 1PiXi / PnXn)

CII = 1(MaxPiPi)

CII = 1(Sobs / Smax + Bobs / Bmax) / 2

III = Pi / MaxPi

The degree of invasion (DI) was calculated as follows (Guo et al., 2015 Guo Q, Fei S, Dukes JS, Oswalt CM, Iannone III BV, Potter KM. (2015) A unified approach for quantifying invasibility and degree of invasion. Ecology 96: 2613‒2621.):

DI = 1(Sinv / Stot + Binv / Btot) / 2

where Sinv and Binv are observed invasive richness and biomass, respectively, and Stot and Btot are total (native plus invasive) richness and biomass in the community, respectively. In particular, plant communities with higher values of DI possess greater degree of invasion compared with those with lower values of DI.

RII = Bi / MaxBi

CAI = Σ(PiXi) / (PaXa)

RCAI = Σ(PxXx) / (PiXi)

CCEI = CAIxy / (CAIx + CAIy)

FDj = (|CWTijCWTnj|) / (CWTiCWTn)

1. 入侵植物对植物种类多样性影响幅度指数[The degree of influence index of invasive plant species on species diversity (S), DIIS]按照以下公式计算（Wang CY, Cheng HY, Wang S, Wei M, Du DL. 2021. Plant community and the influence of plant taxonomic diversity on community stability and invasibility: A case study based on Solidago canadensis L. Science of the Total Environment 768: 144518.

DIIS = 1(Si / Sck)

2. 入侵植物对植物Shannon多样性影响幅度指数[The degree of influence index of invasive plant species on Shannon’s diversity (H'), DIIH']按照以下公式计算（Wang CY, Cheng HY, Wang S, Wei M, Du DL. 2021. Plant community and the influence of plant taxonomic diversity on community stability and invasibility: A case study based on Solidago canadensis L. Science of the Total Environment 768: 144518.）：

DIIH' = 1(H'i / H'ck)

3. 入侵植物对植物Simpson优势度影响幅度指数[The degree of influence index of invasive plant species on Simpson’s dominance (D), DIID]按照以下公式计算（Wang CY, Cheng HY, Wang S, Wei M, Du DL. 2021. Plant community and the influence of plant taxonomic diversity on community stability and invasibility: A case study based on Solidago canadensis L. Science of the Total Environment 768: 144518.

DIID = 1(Di / Dck)

4. 入侵植物对植物Pielou均匀度影响幅度指数[The degree of influence index of invasive plant species on Pielou’s evenness (EH), DIIEH]按照以下公式计算（Wang CY, Cheng HY, Wang S, Wei M, Du DL. 2021. Plant community and the influence of plant taxonomic diversity on community stability and invasibility: A case study based on Solidago canadensis L. Science of the Total Environment 768: 144518.

DIIEH = 1 ‒ (EHi / EHck)

5. 入侵植物对植物Margalef丰富度影响幅度指数[The degree of influence index of invasive plant species on Margalef’s richness (F), DIIF]按照以下公式计算（Wang CY, Cheng HY, Wang S, Wei M, Du DL. 2021. Plant community and the influence of plant taxonomic diversity on community stability and invasibility: A case study based on Solidago canadensis L. Science of the Total Environment 768: 144518.

DIIF = 1(Fi / Fck)

PSF index = ln (BLocal / BForeign)

R'ij = (Bcoi Bmi) / (Bcoi Bmi)

The relative competition intensity (RCI) index was determined as the difference between biomass when grown alone and biomass when grown in competition divided by biomass when grown alone, i.e., RCI = (Biomassalone – Biomasscompetition) / Biomassalone (Weigelt and Jolliffe 2003 Weigelt A, Jolliffe P. 2003. Indices of plant competition. Journal of Ecology 91: 707–720.; Fahey and Flory 2022 Fahey C, Flory SL. 2022. Soil microbes alter competition between native and invasive plants. Journal of Ecology 110: 404-414.).

RDIij = Bcoi / Bcoij

To assess the role of allelopathy in invasive plant species in co-cultivation condition, we calculated an index for immediate allelopathy and allelopathic legacy from the competitive responses of invasive plant species and native species. To do this we used log-response ratios, which is defined as the logarithm of the species biomass in the co-cultivation condition relative to the monoculture condition (Hedges et al. 1999 Hedges LV, Gurevitch J, Curtis PS. 1999. The meta-analysis of response ratios in experimental ecology. Ecology 80: 1150–1156.).

In particular, the immediate allelopathy index and allelopathic legacy index were calculated respectively as follows (Del Fabbro and Prati 2015 Del Fabbro C, Prati D. 2015. The relative importance of immediate allelopathy andallelopathic legacy in invasive plant species. Basic and Applied Ecology 16: 28–35):

Immediate allelopathy index = (Competitive response in native soil without activated carbon ‒ Competitive response in native soil with activated carbon)

Allelopathic legacy index = (Competitive response in invaded soil without activated carbon ‒ Competitive response in invaded soil with activated carbon) ‒ (Competitive response in native soil without activated carbon ‒ Competitive response in native soil with activated carbon)

https://blog.sciencenet.cn/blog-565899-1421128.html

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