Competition between <i>Artemisia frigida</i> and <i>Cleistogenes squarrosa</i> under different clipping intensities in replacement series mixtures at different nitrogen levels

Gao, Ying; Wang, S. P.; Han, Xingguo; Patton, Bob D.; Nyrén, Pål

doi:10.1111/j.1365-2494.2005.00458.x

Cited by 31 publications

(28 citation statements)

References 29 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The abundant leaves range in length from 6 to 12 mm and are two or three times ternately (sub-pinnately) divided. A. frigida is the most common dicotyledonous species in the steppes of the Eurasian continent and the Northern Mixed Prairie (Bai and Romo 1996;Gao et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Allelopathic potential of Artemisia frigida and successional changes of plant communities in the northern China steppe

Jian

Huang

et al. 2010

Plant Soil

View full text Add to dashboard Cite

In the northern China steppe, overgrazing has decreased the abundance of many species that were originally dominant, but increased the abundance of Artemisia frigida. We aimed to determine whether the adaptive and competitive abilities of A. frigida are associated with allelopathy. Soil nutrient characteristics could not explain the poor growth of the originally dominant species. Volatile compounds released from A. frigida leaves and aqueous extracts (0.025, 0.05, 0.075, 0.10, and 0.15 g ml −1 ) from A. frigida leaves and roots and from soil under A. frigida inhibited seed germination and seedling growth of three dominant species (Leymus chinensis, Stipa krylovii, and Cleistogenes squarrosa). Allelopathic activity varied according to extract concentration, test species, and extract source. Germination was most strongly inhibited in S. krylovii, followed by L. chinensis and then C. squarrosa. Seedling growth was most strongly inhibited in L. chinensis, followed by S. krylovii and then C. squarrosa. Gas chromatography-mass spectrometry analyses of the leaf volatiles identified 27 compounds, primarily monoterpene or sesquiterpene compounds and their oxygencontaining derivatives, such as eucalyptol, beta.-myrcene, 1,6-octadien-3-ol,3,7-dimethyl, 3-carene, bicyclo[2.2.1]heptan-2-one,1,7,7-trimethyl-,(1R), cissabinenehydrate, camphene, and alpha-Pinene. These findings suggest that allelochemicals from A. frigida can modify the surrounding micro-habitat. The responses of target plants to allelopathy of A. frigida may be one reason for changes in plant community succession in the northern China steppe.

show abstract

Section: Introductionmentioning

confidence: 99%

Allelopathic potential of Artemisia frigida and successional changes of plant communities in the northern China steppe

Jian

Huang

et al. 2010

Plant Soil

View full text Add to dashboard Cite

show abstract

“…Li & Watkinson (2000) found a reversal of outcomes in competition at intermediate levels of nutrients in two species (Daucus carota and Chenopodium album) in a greenhouse experiment along a nutrient gradient. Gao et al (2005) showed a consistent competitive hierarchy under different clipping intensities at different nitrogen levels in two species (Artemisia frigida and Cleistogenes squarrosa) in a replacement series mixture. In this experiment, the order of competitive ability among the three species was not changed when the fertiliser treatment was imposed.…”

Section: Results Emergencementioning

confidence: 99%

“…In this experiment, the order of competitive ability among the three species was not changed when the fertiliser treatment was imposed. Clipping has been shown to have a large effect on plant growth in many studies (Li & Watkinson 2000;hamback & Beckerman 2003;Gao et al 2005). The clipping height, as a simulation of grazing, was controlled at the same level for all species.…”

Section: Results Emergencementioning

confidence: 99%

“…Grazing can alter these competitive relations through increased light intensity reaching the soil surface and the remaining vegetation, and through increased water or nutrient availability (Martin & Chambers 2001). Fertiliser application is another factor that can affect these competitive relationships leading to variations in the outcome of competition (Gao et al 2005). The Qinghai-Tibetan plateau rangelands are characterised by low temperature and high altitude.…”

Section: Introductionmentioning

confidence: 99%

“…The persistence of plants in a grassland ecosystem depends largely on the ability of individuals to cope with complex and dynamic interactions between herbivory and the limitations of environmental resources (Gao et al 2005). Grazing can alter these competitive relations through increased light intensity reaching the soil surface and the remaining vegetation, and through increased water or nutrient availability (Martin & Chambers 2001).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interspecific interactions in binary mixtures ofElymus nutans, Festuca sinensisandFestuca ovinaon the eastern Qinghai‐Tibetan plateau

Dong

2009

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

same time, the competitive ability between E. nutans and F. sinensis and between E. nutans and F. ovina was significantly different, and between F. sinensis and F. ovina was not significantly different based on the RCI. The relative competitive ability of a species depended on density. For low densities, E. nutans was most competitive, followed by F. ovina and lastly by F. sinensis. In higher densities, the competitive order was reversed. E. nutans was most competitive, followed by F. sinensis and, lastly by F. ovina. A three-way ANOVA on RCI showed that clipping and fertilisation changed the competition intensity among the three species but did not change the relative competitive order in mixtures.Keywords alpine meadow; clipping; competition; fertiliser; pasture mixtures Abstract The relative competitive abilities of Elymus nutans, Festuca sinensis and Festuca ovina were studied in the east Qinghai-Tibetan plateau. Emergence percentage, numbers of plants established, establishment rate and the relative competitive intensity (RCI) based on harvested shoot biomass were measured for the three species as monocultures and in all possible combinations of mixtures in four randomised complete blocks. In the seedling stage, ANOVA showed that emergence percentage was density independent and was greatest for E. nutans, somewhat lower for F. sinensis, and least for F. ovina. The multiple comparisons (Tukey HSD) showed that the emergence percentage was significantly different among the three species. In the adult stage, the result of correlation analysis showed that the establishment rate of a species was density dependent. The multiple comparisons show that the established numbers and establishment rate were significantly different am ong the three species. At the A08043;

show abstract

Defoliation, nitrogen, and competition: effects on plant growth and resource allocation of Cleistogenes squarrosa and Artemisia frigida

Gao

Wang

Han

et al. 2007

Z. Pflanzenernähr. Bodenk.

View full text Add to dashboard Cite

Two species, Artemisia frigida Willd. (C 3 , semishrub, and dominant on overgrazed sites) and Cleistogenes squarrosa (Trin.) Keng (C 4 , perennial bunchgrass, and dominant or codominant on moderately grazed sites) were studied to determine the effects of defoliation, nitrogen (N) availability, competition, and their interactions on growth, biomass, and N allocation in a greenhouse experiment. The main treatments were: two nitrogen levels (N0 = 0 mg N pot -1 , N1 = 60 mg N pot -1 ), two defoliation intensities (removing 60% of total aboveground biomass and no defoliation), and three competitive replacement series (monocultures of each species and mixtures at 0.5:0.5). Our results were inconsistent with our hypothesis on the adaptive mechanisms of A. frigida regarding the interactive effects of herbivory, N, and competition in determining its dominant position on overgrazed sites. Cleistogenes squarrosa will be replaced by A. frigida on over-grazed sites, although C. squarrosa had higher tolerance to defoliation than did A. frigida. Total biomass and N yield and 15 N recovery of C. squarrosa in mixed culture were consistently lower than in monocultures, whereas those of A. frigida grown in mixtures were consistently higher than in monocultures, suggesting higher competitive ability of A. frigida. Our results suggest that interspecific competitive ability may be of equal or greater importance than herbivory tolerance in determining herbivore-induced species replacement in semi-arid Inner Mongolian steppe. In addition, the dominance of A. frigida on overgrazed sites has been attributed to its ability to shift plant-plant interactions through gap colonization, root niche differentiation, and higher resistance to water stress.

show abstract

Competition between Artemisia frigida and Cleistogenes squarrosa under different clipping intensities in replacement series mixtures at different nitrogen levels

Cited by 31 publications

References 29 publications

Allelopathic potential of Artemisia frigida and successional changes of plant communities in the northern China steppe

Allelopathic potential of Artemisia frigida and successional changes of plant communities in the northern China steppe

Interspecific interactions in binary mixtures ofElymus nutans, Festuca sinensisandFestuca ovinaon the eastern Qinghai‐Tibetan plateau

Defoliation, nitrogen, and competition: effects on plant growth and resource allocation of Cleistogenes squarrosa and Artemisia frigida

Contact Info

Product

Resources

About