All Washed Out? Foliar Nutrient Resorption and Leaching in Senescing Switchgrass

Burke, Ruth Helen; Moore, Kenneth J.; Shipitalo, M. J.; Miguez, Fernando E.; Heaton, Emily A.

doi:10.1007/s12155-017-9819-6

Cited by 5 publications

(4 citation statements)

References 51 publications

(90 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Leached K is the quantity of K removed from plant tissues by water including rain and dew. Leaching of K can be more rapid from senescing tissues where membranes and cell walls are damaged prior to moisture exposure (Burke et al 2017). Although also considered leaching, guttation is another process that may lead to loss of K. Guttation is an exudation of xylem sap from leaves due to root pressure (Taiz et al 2018).…”

Section: Stk Exchmentioning

confidence: 99%

The Potassium Cycle and Its Relationship to Recommendation Development

Brouder

Volenec

Murrell

2020

Improving Potassium Recommendations for Agricultural Crops

View full text Add to dashboard Cite

Nutrient recommendation frameworks are underpinned by scientific understanding of how nutrients cycle within timespans relevant to management decision-making. A trusted potassium (K) recommendation is comprehensive enough in its components to represent important differences in biophysical and socioeconomic contexts but simple and transparent enough for logical, practical use. Here we examine a novel six soil-pool representation of the K cycle and explore the extent to which existing recommendation frameworks represent key plant, soil, input, and loss pools and the flux processes among these pools. Past limitations identified include inconsistent use of terminology, misperceptions of the universal importance and broad application of a single soil testing diagnostic, and insufficient correlation/calibration research to robustly characterize the probability and magnitude of crop response to fertilizer additions across agroecozones. Important opportunities to advance K fertility science range from developing a better understanding of the mode of action of diagnostics through use in multivariate field trials to the use of mechanistic models and systematic reviews to rigorously synthesize disparate field studies and identify knowledge gaps and/or novel targets for diagnostic development. Finally, advancing evidence-based K management requires better use of legacy and newly collected data and harnessing emerging data science tools and e-infrastructure to expand global collaborations and accelerate innovation.

show abstract

Section: Stk Exchmentioning

confidence: 99%

The Potassium Cycle and Its Relationship to Recommendation Development

Brouder

Volenec

Murrell

2020

Improving Potassium Recommendations for Agricultural Crops

View full text Add to dashboard Cite

show abstract

“…Such factors include greater fluctuations in temperature and humidity, freeze-thaw cycles and solar irradiance, which can change the quality of marcescent plant tissue. For example, freeze-thaw cycles and fluctuations in humidity can disrupt surface waxes (Taylor & Parkinson, 1988) and increase the leaching of soluble plant components such as carbohydrates or nutrients (Burke et al, 2017;Cepáková et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Marcescence refers to the retention of dead leaves on the plant during the dormant season, which are commonly not shed prior to the start of the subsequent growing season (Angst et al., 2022), and to dead standing herb stems before their collapse to the soil surface (Lodato et al., 2021). This longer retention of senescent biomass is expected to result in a more efficient retranslocation of nutrients to the plant compared to when litter is shed in early autumn (Burke et al., 2017). Furthermore, marcescent biomass is affected by a multitude of factors that widely differ from those acting on shed senescent biomass, with potential consequences for the decomposition of marcescent tissues when they finally reach the soil.…”

Section: Introductionmentioning

confidence: 99%

“…Such factors include greater fluctuations in temperature and humidity, freeze–thaw cycles and solar irradiance, which can change the quality of marcescent plant tissue. For example, freeze–thaw cycles and fluctuations in humidity can disrupt surface waxes (Taylor & Parkinson, 1988) and increase the leaching of soluble plant components such as carbohydrates or nutrients (Burke et al., 2017; Cepáková et al., 2016). Likewise, solar irradiance has the ability to photodegrade otherwise recalcitrant compounds, mainly lignin (Austin et al., 2016; Pieristè et al., 2020), thus altering or ‘photofacilitating’ the decomposition of marcescent biomass in soil once shed (Angst et al., 2017; Yanni et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of dead standing (marcescent) biomass on litter decomposition in herbaceous flora is governed by plant functional group

Angst,

Mudrák,

Frouz

et al. 2024

Functional Ecology

View full text Add to dashboard Cite

In autumn, temperate herbs begin to senesce and gradually shed their litter. However, surprisingly large amounts of dead biomass remain standing, that is, marcescent. The consequences of marcescence for the decomposition of biomass once it finally reaches the soil are largely unknown. Here, we aimed to determine whether marcescence affects subsequent litter decomposition in the organic layer to such an extent that its mass loss and chemistry are distinguishable from those of directly shed biomass. We further aimed to disentangle the role of plant functional traits and groups (forbs vs. grasses) concerning the marcescence effect on decomposition. To this end, we sampled the living, marcescent and shed senescent biomass of 39 herbaceous plant species grown in a common garden experiment, determined plant functional traits and incubated the marcescent and shed plant tissues in the field in an allochthonous organic layer for 6 months. We determined the mass loss, C and N contents, chemical composition and microbial community structure of the decomposed tissues. Our results show that marcescent tissues decomposed more slowly than directly shed tissues (mass loss 37.3% vs. 63.2% for forbs, 43.5% vs. 45.5% for grasses), likely due to more favourable conditions for decomposition in the organic layer. These were reflected in a significantly higher microbial colonization of shed (~333 and 708 μg biomass C g−1 for forbs and grasses, respectively) than marcescent tissue (~189 and 543 μg biomass C g−1 for forbs and grasses, respectively) even after 6 months in the organic layer. Moreover, higher relative contributions of aliphatics and polyphenolics in shed tissues indicated a more advanced stage of decomposition. Notably, marcescent tissues of forbs, with a more complex growth architecture (being composed of stems [marcescent] and leaves [shed]), decomposed substantially more slowly than directly shed tissues. In contrast, differences in decomposition between marcescent and shed tissues of grasses, with a more uniform growth architecture, were substantially less pronounced. These findings highlight that marcescence in the temperate herbaceous flora can strongly affect litter decomposition and thus C and nutrient cycling through temperate ecosystems, but that the extent to which marcescence affects decomposition depends on plant functional group.

show abstract