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入侵植物相关指标计算方法

已有 1916 次阅读 2021-10-8 14:49 |个人分类:自然之旅|系统分类:科研笔记

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群落可入侵性指数(Community invasibility index, CII)按照以下公式计算(Wang CY, Wei M, Wang S, Wu BD, Cheng HY (2020) Erigeron annuus (L.) Pers. and Solidago canadensis L. antagonistically affect community stability and community invasibility under the co-invasion condition. Sci Total Environ 716:137128. doi:10.1016/j.scitotenv.2020.137128.)

CII=1‒(MaxPiPi)

式中MaxPi为所有调查样方内入侵植物相对丰度最大值,Pi为调查样方内入侵植物的相对丰度。CII值越大表示群落可入侵性越高。

  

 

群落可入侵性指数(Community invasibility index, CII)按照以下公式计算(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.; Rijal DP, Alm T, Nilsen L, Alsos IG. 2017. Giant invasive Heracleum persicum: Friend or foe of plant diversity? Ecology and Evolution 7: 4936‒4950.)

CII=1−(Sobs/Smax+Bobs/Bmax)/2

式中SobsBobs分别为调查样方内所有物种种类的数量和总生物量。SmaxBmax分别为所有调查样方内所有物种种类的数量和总生物量最大值。

  

 

The community invasibility (CII) of a plot was calculated as follows:

CII=(SiSo)/(SSo)

where So represents the original number of plant species at the beginning of the investigation; Si represents the number of plant species at the time i. S represents the total number of species (Foster BL, Smith VH, Dickson TL, Hildebrand T. 2002. Invasibility and compositional stability in a grassland community: relationships to diversity and extrinsic factors. Oikos 99: 300–307).

  

 

入侵植物入侵强度指数(Invasion intensity index, III)按照以下公式计算(Wang CY, Wei M, Wang S, Wu BD, Cheng HY (2020) Erigeron annuus (L.) Pers. and Solidago canadensis L. antagonistically affect community stability and community invasibility under the co-invasion condition. Sci Total Environ 716:137128. doi:10.1016/j.scitotenv.2020.137128.)

III=Pi/MaxPi

式中MaxPi为所有调查样方内入侵植物相对丰度最大值,Pi为调查样方内入侵植物的相对丰度。III值越大表示入侵植物的入侵强度越高。

  

 

Degree of invasion (DI) was calculated as follows (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.

  

 

入侵植物相对入侵力指数(Relative invasiveness index, RII)按照以下公式计算(Wang CY, Wei M, Wang S, Wu BD, Cheng HY (2020) Erigeron annuus (L.) Pers. and Solidago canadensis L. antagonistically affect community stability and community invasibility under the co-invasion condition. Sci Total Environ 716:137128. doi:10.1016/j.scitotenv.2020.137128.)

RII=Bi/MaxBi

式中MaxBi为所有调查样方内入侵植物的总生物量最大值,Bi为调查样方内入侵植物的总生物量。RII值越大表示入侵植物的入侵竞争力越高。

  

 

入侵植物竞争优势度指数(Competitive advantage index of invasive alien plants, CAI)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. doi:10.1016/j.scitotenv.2020.144518.)

CAIPiXi/PaXa

式中S为调查样方内所有植物种类的数量;Pi为调查样方内入侵植物i的相对丰度,即Pi=ni/N,其中ni为调查样方内入侵植物i的植株数量,N为调查样方内所有植物的植株数量总数;Xi为调查样方内入侵植物i的所有测定生理生态指标(如株高、叶片大小、叶绿素含量、生物量等)的算术平均值;Pa为调查样方内植物a的相对丰度,即Pa=na/N,其中na为调查样方内植物a的植株数量,N为调查样方内所有植物的植株数量总数;Xa为调查样方内植物a的所有测定生理生态指标(如株高、叶片大小、叶绿素含量、生物量等)的算术平均值。CAI值越大表示入侵植物的竞争优势度越大。

  

 

入侵植物和本地植物功能差异指数(Functional differences index, FDj)按照以下公式计算(Gross N, Börger L, Duncan RP, Hulme PE. 2013. Functional differences between alien and native species: do biotic interactions determine the functional structure of highly invaded grasslands? Functional Ecology 27: 1262‒1272.)

FDj=(|CWTijCWTnj|)/(CWTiCWTn)

式中FDj为样方j内入侵植物特征加权值(CWTij)与本地植物特征加权值(CWTnj)的功能差异指数。CWTi为所有样方或某一处理下所有样方入侵植物特征加权值,CWTn为所有样方或某一处理下所有样方本地植物特征加权值。若FDj大于0表明入侵植物和本地植物功能性状存在明显的差异性,即趋向功能分化(Functionally diverge),生态位分化(Niche differentiation)起主要作用;若FDj小于0表明入侵植物和本地植物功能性状存在明显的相似性,即趋向功能相似(Functionally converge),生境过滤(Habitat filtering)起主要作用。

 

  

入侵植物对植物物种多样性影响幅度指数

(I)入侵植物对植物种类多样性影响幅度指数[The degree of influence of invasive alien plants on species diversity (S), IAIS]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. doi:10.1016/j.scitotenv.2020.144518.)

IAIS=1‒(Si/Sck)

式中Si为入侵植物已入侵样方的植物种类多样性(即:所有植物种类的数量)Sck为入侵植物未入侵样方的植物种类多样性。IAIS值越大表示入侵植物对植物种类多样性的生态影响风险越大。

(II)入侵植物对植物Shannon多样性影响幅度指数[The degree of influence of invasive alien plants on Shannon’s diversity (H'), IAIH']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. doi:10.1016/j.scitotenv.2020.144518.)

IAIH'=1‒(H'i/H'ck)

式中H'i为入侵植物已入侵样方的植物Shannon多样性,H'ck为入侵植物未入侵样方的植物Shannon多样性。IAIH'值越大表示入侵植物对植物Shannon多样性的生态影响风险越大。

(III)入侵植物对植物Simpson优势度影响幅度指数[The degree of influence of invasive alien plants on Simpson’s dominance (D), IAID]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. doi:10.1016/j.scitotenv.2020.144518.)

IAID=1‒(Di/Dck)

式中Di为入侵植物已入侵样方的植物Simpson优势度,Dck为入侵植物未入侵样方的植物Simpson优势度。IAID值越大表示入侵植物对植物Simpson优势度的生态影响风险越大。

(IV)入侵植物对植物Pielou均匀度影响幅度指数[The degree of influence of invasive alien plants on Pielou’s evenness (EH), IAIEH]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. doi:10.1016/j.scitotenv.2020.144518.)

IAIEH=1‒(EHi/EHck)

式中EHi为入侵植物已入侵样方的植物Pielou均匀度,EHck为入侵植物未入侵样方的植物Pielou均匀度。IAIEH值越大表示入侵植物对植物Pielou均匀度的生态影响风险越大。

(V)入侵植物对植物Margalef丰富度影响幅度指数[The degree of influence of invasive alien plants on Margalef’s richness (F), IAIF]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. doi:10.1016/j.scitotenv.2020.144518.)

IAIF=1‒(Fi/Fck)

式中Fi为入侵植物已入侵样方的植物Margalef丰富度,Fck为入侵植物未入侵样方的植物Margalef丰富度。IAIF值越大表示入侵植物对植物Margalef丰富度的生态影响风险越大。

  

 

入侵植物直接化感效应和化感遗留效应值计算

To assess the role of allelopathy in invasive alien plants in co-cultivation condition, we calculated an index for immediate allelopathy and allelopathic legacy from the competitive responses of invasive alien plants 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 LV, Gurevitch J, Curtis PS. 1999. The meta-analysis of response ratios in experimental ecology. Ecology 80:1150–1156.).

Specifically, the immediate allelopathy index and allelopathic legacy index were calculated respectively as follows (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)


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