Tiller recruitment and mortality in the dryland bunchgrass Eragrostis curvula as affected by defoliation intensity

Wan, Changgui; Sosebee, Ronald E.

doi:10.1006/jare.2001.0939

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…The differences in each parameter were detected by one-way ANOVA (Duncan test) at P < 0.05 level compensatory responses (Lehtilä 2000). Moderate defoliation may guarantee enough tillers (or buds) within a plant, which may potentially promote ramet regeneration from dormant rhizomatic tillers (Busso et al 1989;Wan and Sosebee 2002;Liu et al 2007). In our study, the above-mentioned mechanisms may contributed to the compensatory ability of L. chinensis and thus can explain at least part of the differences in the compensatory growth among different clipping intensities.…”

Section: Effects Of Clipping Intensity On Compensatory Responses Of Dmentioning

confidence: 99%

Compensatory growth responses to clipping defoliation in Leymus chinensis (Poaceae) under nutrient addition and water deficiency conditions

2007

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Compensatory growth responses of Leymus chinensis, a dominant species in Inner Mongolia steppe, to clipping defoliation were evaluated in a pot-cultivated experiment under different nutrient (N and P) and water availability conditions. Leymus chinensis exhibited over-compensatory growth at the light and moderate clipping intensities (20% and 40% aerial mass removed) with a greater accumulated aboveground biomass, higher relative growth rate (RGR), more rhizomatic tillers and a stimulation of compensatory photosynthesis to the remnant leaves as compared with those of the unclipped plants. Intense clipping (80% aerial mass removed), which removed most of the aboveground tissues, greatly reduced the growth of aboveground biomass in comparison with that of the unclipped plants. Nitrogen addition only slightly improved the biomass production and RGR in light and moderately clipped plants, and it did not allow plants in the intense clipping condition to over-compensate. Phosphorus addition had no obvious influences on the growth and physiological responses to clipping defoliation. These results indicated that nutrient addition could not compensate for the negative effects of severe clipping on the defoliated grass. On the other hand, there were no distinct positive responses under water deficiency condition for L. chinensis at all clipping intensities with a significant reduction of aboveground and belowground biomass, lower RGR, fewer rhizomatic tillers, and a lower net photosynthetic rate than other wet treatments. Additionally, the chlorophyll contents of remnant leaves gradually increased with the increase of clipping intensities in each treatment. In conclusion, although L. chinensis could compensate for tissues removal by some morphological and physiological responses, intense clipping and drought can result in a significant decrease of biomass and growth rate, even under enriched nutrition conditions.

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Section: Effects Of Clipping Intensity On Compensatory Responses Of Dmentioning

confidence: 99%

Compensatory growth responses to clipping defoliation in Leymus chinensis (Poaceae) under nutrient addition and water deficiency conditions

2007

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“…For example, grazing may affect grass persistence by increasing the proportion of dead axillary buds per tiller (Flemmer, Busso & Fernandez ) or by reducing tiller density (Becker et al . ; Wan & Sosebee ). The effect of resource availability on axillary bud density, activation, and tiller recruitment and its consequences for ecosystem functioning has received relatively small attention in the literature (but see Busso, Mueller & Richards ; Dalgleish et al .…”

Section: Introductionmentioning

confidence: 98%

Differential sensitivities of grassland structural components to changes in precipitation mediate productivity response in a desert ecosystem

Reichmann

Sala

2014

Functional Ecology

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Summary 1.In arid and semi-arid ecosystems, there are legacies of previous-year precipitation on current-year above-ground net primary production. We hypothesized that legacies of past precipitation occur through changes in tiller density, stolon density, tiller growth, axillary bud density and percentage of viable axillary buds. We examined the sensitivity to current-and previousyear precipitation of these grassland structural components in Bouteloua eriopoda, the dominant grass in the northern Chihuahuan Desert. 2. We conducted a rainfall manipulation experiment consisting in À80% reduced precipitation, ambient, +80% increased precipitation treatments that were subjected to one of five precipitation levels in the previous two years (À80% and À50% reduced precipitation, ambient, +50% and +80% increased precipitation). The first two years preconditioned the experimental plots for year three, in which we created wet-to-dry and dry-to-wet transitions. Measurements were taken in year 3. 3. We found that stolon density was the most sensitive to changes in precipitation and that percent-active buds were insensitive. 4. We also found that past precipitation had a significant legacy on grassland structural components regardless of the precipitation received in the current year, and that the legacy occurs mostly through changes in stolon density. 5. Here, we showed that there is a differential sensitivity of structural components to current and past precipitation and supported previous findings that vegetation structure is one of the controls of productivity during precipitation transitions.

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Responses of grassland productivity to mowing intensity and precipitation variability in a temperate steppe

et al. 2022

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Tiller recruitment and mortality in the dryland bunchgrass Eragrostis curvula as affected by defoliation intensity

Cited by 4 publications

References 27 publications

Compensatory growth responses to clipping defoliation in Leymus chinensis (Poaceae) under nutrient addition and water deficiency conditions

Compensatory growth responses to clipping defoliation in Leymus chinensis (Poaceae) under nutrient addition and water deficiency conditions

Differential sensitivities of grassland structural components to changes in precipitation mediate productivity response in a desert ecosystem

Responses of grassland productivity to mowing intensity and precipitation variability in a temperate steppe

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