Do clonal growth form and habitat origin affect resource-induced plasticity in Tibetan alpine herbs?

He, Zhengsheng; He, Wei‐Ming; Yu, Fei‐Hai; Shi, Peili; Zhang, Xianzhou; He, Yongtao; Zhang, Zhiming; Dong, Ming

doi:10.1016/j.flora.2006.08.006

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…The importance of this heterogeneity has received considerable attention (Alpert and Mooney, 1986;de Kroon et al, 1998;Friedman and Alpert, 1991;Gabriel et al, 2005;He et al, 2004He et al, , 2007Liu et al, 2007;Price and Marshall, 1999;Roiloa et al, 2007;Stuefer et al, , 1996. Reciprocal patches are characterized having a negative covariance in resources (e.g.…”

Section: Introductionmentioning

confidence: 99%

Spatial covariance in resources affects photosynthetic rate and water potential, but not the growth of Glechoma longituba fragments

Zhang

2009

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Introductionmentioning

confidence: 99%

Spatial covariance in resources affects photosynthetic rate and water potential, but not the growth of Glechoma longituba fragments

Zhang

2009

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…In particular, lateral expansion by stolons is associated with the maintenance and local consolidation of populations of perennial herbs (Grime 1979;de Kroon and Schieving 1990;Dong and de Kroon 1994). Some authors have looked at relationships between species functional traits and their responses to grazing (Diaz et al 1992), cessation of grazing (Lavorel et al 1997;Peco et al 2005) or heterogeneous soil conditions (He et al 2007). The identification of plant functional traits that explain responses of species to grazing intensity is one of the main tools in management of grazed systems (see for examples Weiher et al 1999;Diaz et al 2001), but overall, clonal propagation traits have been largely neglected (Vesk et al 2004).…”

Section: Introductionmentioning

confidence: 99%

After grazing exclusion, is there any modification of strategy for two guerrilla species: Elymus repens (L.) Gould and Agrostis stolonifera (L.)?

Amiaud¹,

Touzard

Bonis

et al. 2007

Plant Ecol

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Elymus repens (L.) Gould and Agrostis stolonifera (L.), are competitive grasses with guerrilla strategy that invade grasslands with a low stocking rate. In this work, we tested the hypotheses that grazing exclusion facilitates vegetative development of rhizomes and stolons of these clonal grasses and that such change is a key mechanism for their abundance in set-aside grasslands. The competitive capacities of these two guerrilla species were characterised by samples in plant community (species richness and biomass) and on the level of individual species (morphometric measurements on stolons and rhizomes) during a growing season. Compared to grasslands where grazing was excluded for three years, species richness was higher in grazed site and the plant community structure differed. Indeed, with grazing exclusion, a shift from annual species with a diversified growth-form to perennial species with a tall tussock and graminoid growth-form was monitored. In ungrazed situation, Elymus repens and Agrostis stolonifera were the dominant grasses, and the standing biomass for the lowland community showed a significant increase compared to the grazed site. Vegetative development increased competitive capacities of these two guerrilla species and led by phenomenon of competitive exclusion to the disappearance of annuals species. With grazing cessation, Elymus repens was found to increase the size of aerial traits (shoot length and the number of leaves per shoot) and this may both be propitious for achieving dominance within plant communities and also maintaining its competitive local advantage. By contrast, Agrostis stolonifera showed an increase in a root trait, i.e. rhizome length, in the fenced site, which provide good ability for spatial propagation and then to explore adjacent patches. We concluded that Elymus repens presented a morphological capacity to change its colonising strategy from a guerrilla strategy to a phalanx strategy, by morphological variability of aerial organs, when it was submitted to competitive stress and environment modifications. Agrostis stolonifera showed a capacity to escape aerial competition resulting from grazing cessation, than to increase underground propagation capacity. The present study highlighted the capacities of Elymus repens to respond in an adaptative way to competitive pressure.

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“…This dispersal strategy may closely correlate with the evolutionary processes of local adaptation and niche separation of sedges 33 . C. montis - everestii and C. moorcroftii are guerrilla-type rhizomatous sedges with high cold and barren area tolerance, an exploitation resource strategy, and less habitat-dependent plasticity 34 . The developed guerrilla rhizome competes for belowground resources in degraded lands 35 , whereas Kobresia spp.…”

Section: Discussionmentioning

confidence: 99%

Variation in plant functional groups indicates land degradation on the Tibetan Plateau

Luo

Liu

Yang

et al. 2018

Sci Rep

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Plant functional groups (PFGs) have been increasingly introduced in land degradation (LD) studies; however, it is unclear whether PFGs can indicate LD. Here, we selected five different degraded lands (i.e., pristine and, lightly, moderately, seriously and extremely degraded) higher than 4650 m on the Tibetan Plateau. In addition, we investigated floristic metrics (i.e., composition, height, cover, biomass and abundance) and soil conditions (e.g., moisture, temperature and gravel ratio) by sampling 225 subplots. We found 75 vascular plants that consist of sedges (Cyperaceae), grasses (Gramineae), legumes, forbs, cushion plants and shrubs PFGs. LD dramatically deteriorated soil conditions, vegetation cover and productivity, however, improved species diversity. Moreover, cover and productivity showed a hump-shaped relationship with LD intensification in legumes, grasses and forbs and decreased mainly in sedges. Productivity increased considerably in cushion plants and shrubs on the extremely degraded land. Major characteristics of the LD process were the replacement of Kobresia spp. by Carex spp. in sedges; cushion plants significantly expanded, and shrubs appeared on the extremely degraded land. We, thus, confirm that the PFG variations are likely to indicate a LD process and demonstrate ways of using PFGs to assess LD status on the Tibetan Plateau.

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Do clonal growth form and habitat origin affect resource-induced plasticity in Tibetan alpine herbs?

Cited by 10 publications

References 27 publications

Spatial covariance in resources affects photosynthetic rate and water potential, but not the growth of Glechoma longituba fragments

Spatial covariance in resources affects photosynthetic rate and water potential, but not the growth of Glechoma longituba fragments

After grazing exclusion, is there any modification of strategy for two guerrilla species: Elymus repens (L.) Gould and Agrostis stolonifera (L.)?

Variation in plant functional groups indicates land degradation on the Tibetan Plateau

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