Macrophyte root and rhizome decay: the impact of nutrient enrichment and the use of live versus dead tissue in decomposition studies

Snyder, Jenise M.; Rejmánková, Eliška

doi:10.1007/s10533-015-0080-9

Cited by 13 publications

(12 citation statements)

References 77 publications

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“…Senescent biomass of wetland macrophytes is the ultimate source of carbon for sediment microorganisms, and through leaching as dissolved organic matter (DOM) it can reach and impact adjacent water bodies. The difference in phenolic content of macrophyte litter can have important implications for processes such as decomposition (Snyder and Rejmánková 2015), yet despite its potential importance, data on phenolic and lignin concentrations in emergent macrophytes are very rare. Both phenolic and lignin values found in this study are low.…”

Section: Discussionmentioning

confidence: 99%

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Rejmánková

2015

Folia Geobot

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This study compares soluble phenolics and lignin content in two wetland macrophytes with contrasting life strategies grown under a varying nutrient supply in the field and in a greenhouse experiment. The differences are explained in terms of the protein competition model (PCM) hypothesis relating changes in secondary metabolites to changing nutrient limitation. The two study species, Eleocharis cellulosa (EC) and Typha domingensis (TD), are both widespread in tropical and subtropical freshwater and brackish marshes of the New World, and are often found in P-limited rather than Nlimited conditions. TD is a fast-growing competitor with large nutrient requirements. EC is a stress tolerator, quite well adapted to growth in nutrient-limiting environments. In both species, the concentration of phenolics was negatively correlated with increasing growth (due to increasing nutrient levels). This is in agreement with the PCM hypothesis, which predicts an increase in phenolic synthesis when protein synthesis (and consequently growth) is low due to limited resource availability. An interesting difference was found in the correlation between tissue nutrients and phenolics. TD from both the field and the greenhouse showed a negative correlation between tissue P and phenolics, while EC displayed a significant negative correlation between tissue N and phenolics. EC is adapted to low P, and increased tissue P content represents luxury consumption (uptake of P for storage) which is not reflected in increased growth and thus is not correlated with phenolics. These are the first steps in elucidating the relationship among nutrient availability, growth and phenolic content in two important primary producers of tropical and subtropical marshes.

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Section: Discussionmentioning

confidence: 99%

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Rejmánková

2015

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“…This was a result of increasing biomass (growth) and decreasing N and P concentrations (Fig. 6), probably caused by active retranslocation of N and P even before maximum length was reached (Snyder & Rejmánková, 2015). If harvesting is done when culms reach the maximum amount of N and P stored (and not when they are fully grown), N and P removal through harvesting can increase by almost 50%.…”

Section: Discussionmentioning

confidence: 99%

The effect of seasonal flooding and livelihood activities on retention of nitrogen and phosphorus in Cyperus papyrus wetlands, the role of aboveground biomass

et al. 2021

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With growing demand for food production in Africa, protecting wetlands and combining increased agricultural production with conservation of the ecological integrity of wetlands is urgent. The role of aboveground biomass of papyrus (Cyperus papyrus) in the storage and retention of nitrogen (N) and phosphorus (P) was studied in two wetland sites in East Africa under seasonally and permanently flooded conditions. Nyando wetland (Kenya) was under anthropogenic disturbance from agriculture and vegetation harvesting, whereas Mara wetland (Tanzania) was less disturbed. Maximum papyrus culm growth was described well by a logistic model (regressions for culm length with R2 from 0.70 to 0.99), with culms growing faster but not taller in Nyando than in Mara. Maximum culm length was greater in permanently than in seasonally flooded zones. Total aboveground biomass was higher in Mara than in Nyando. The amounts of N and P stored were higher in Mara than in Nyando. In disturbed sites, papyrus plants show characteristics of r-selected species leading to faster growth but lower biomass and nutrient storage. These findings help to optimize management of nutrient retention in natural and constructed wetlands.

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“…However, the dead leaves of the E. vaginatum decomposed faster than its dead roots. This discrepancy between live and dead plant material when comparing leaf and root decomposition illustrates that live roots may not necessarily be a good predictor of dead root decomposition, particularly for E. vaginatum roots, and that conclusions about decomposition based on live tissues of different plants should be treated with caution, especially if species differ in characteristics such as nutrient resorption efficiency (Scheffer and Aerts, 2000;Snyder and Rejmánková, 2015).…”

Section: Decomposition Of Leaves and Roots Of The Two Speciesmentioning

confidence: 99%

Short-term root and leaf decomposition of two dominant plant species in a Siberian tundra

et al. 2017

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16In tundra ecosystems, global warming is expected to accelerate litter decomposition and to lead to 17 shifts in vegetation composition. To understand these shifts, it is important to understand the 18 interactions between global warming, vegetation composition, litter quality and decomposition in the 19 tundra. In addition, it is important to consider root litter since roots are the major part of plant biomass 20 in the tundra. In order to increase our understanding of decomposition, and root decomposition in 21 particular, we performed a litter transplant experiment in northeastern Siberia, in which we measured 25Our results show that although leaf decomposition did not differ between the two species, root 26 decomposition showed significant differences. Mass loss of live roots was higher for E. vaginatum 27 than for B. nana, but mass loss of E. vaginatum dead roots was lowest. In addition, we found evidence

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Macrophyte root and rhizome decay: the impact of nutrient enrichment and the use of live versus dead tissue in decomposition studies

Cited by 13 publications

References 77 publications

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

The effect of seasonal flooding and livelihood activities on retention of nitrogen and phosphorus in Cyperus papyrus wetlands, the role of aboveground biomass

Short-term root and leaf decomposition of two dominant plant species in a Siberian tundra

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