Untitled

Crawford, Michael C.; Grace, Peter R.; Oades, JM

doi:10.1023/a:1026599229920

Cited by 30 publications

(8 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many studies have shown that both plant and soil respiration are sensitive to defoliation events and suggest that both are highly dependent on current photosynthetic input (Crawford et al, 2000;Kuzyakov et al, 2002;Bahn et al, 2008;Gavrichkova et al, 2010;Shahzad et al, 2012). However, that was not the case in this study as R E did not significantly differ before, during, or after defoliation.…”

Section: Discussioncontrasting

confidence: 77%

“…However, that was not the case in this study as R E did not significantly differ before, during, or after defoliation. The reduction can sometimes be short-lived (Crawford et al, 2000;Schmitt et al, 2013), whereas, in other circumstance is can last for several weeks (Shahzad et al, 2012). It is clear from these studies that individual components of R E , both plant and soil, can be reduced within one to 2 d after defoliation and the loss of leaf area and photosynthetic capacity (Shahzad et al, 2012).…”

Section: Discussionmentioning

confidence: 91%

“…The effect of defoliation on soil respiration can be species-specific. Other studies have found that reduced soil respiration following defoliation can persist from a few days (Crawford et al, 2000) to as long as a month (Shahzad et al, 2012). However, soil respiration rapidly increased to predefoliation levels with alfalfa whereas the effects of clipping of perennial ryegrass were longer lived.…”

Section: Defoliation Effects On Pasture Photosynthesis and Respirationmentioning

confidence: 92%

“…After defoliation, the reduction of photosynthate supply to roots and ultimately to soil organisms can cause a decrease in ecosystem respiration (R E ) including both belowground root (Davidson and Milthorpe, 1966;Crawford et al, 2000;Kuzyakov et al, 2002) and soil microbial respiration (Bahn et al, 2008;Gavrichkova et al, 2010;Shahzad et al, 2012). The effect of defoliation on soil respiration can be species-specific.…”

Section: Defoliation Effects On Pasture Photosynthesis and Respirationmentioning

confidence: 99%

See 3 more Smart Citations

Defoliation Effects on Pasture Photosynthesis and Respiration

Skinner

Goslee

2016

Crop Science

View full text Add to dashboard Cite

Ecosystem C gain or loss from managed grasslands depends on management practices. However, limited information is available at the field scale on how the type of defoliation, specifically grazing vs. cutting, affects gross primary productivity (GPP) and ecosystem respiration (RE) immediately after defoliation and during the regrowth process. This study takes advantage of daily field‐scale micrometeorological measurements of GPP and RE made over a 9‐yr period on two pastures that were grazed or cut approximately five times per year to examine the relative effects of grazing and cutting on GPP and RE. The null hypotheses were that the initial reduction in GPP and RE following defoliation and the time required for recovery to pre‐defoliation levels did not differ in response to defoliation method. Overall, RE was greater in cut pastures than in grazed pastures. Regardless of defoliation method, RE did not change during the first week after defoliation, or during the 5 wk following. The initial reduction in GPP2000 (GPP in full sunlight) was greater when pastures were cut (70%) than grazed (46%) and recovery to pre‐defoliation levels took 5 wk for cut pastures vs. 3 wk when grazed. This study suggests, all other management practices being similar, that grazed pastures should be stronger annual C sinks than cut pastures. However, cut and grazed pastures are rarely managed in the same way such that the realized balance between GPP and RE will depend on both physiological responses to defoliation and management intensity.

show abstract

Section: Discussioncontrasting

confidence: 77%

Section: Discussionmentioning

confidence: 91%

Section: Defoliation Effects On Pasture Photosynthesis and Respirationmentioning

confidence: 92%

Section: Defoliation Effects On Pasture Photosynthesis and Respirationmentioning

confidence: 99%

See 2 more Smart Citations

Defoliation Effects on Pasture Photosynthesis and Respiration

Skinner

Goslee

2016

Crop Science

View full text Add to dashboard Cite

show abstract

“…Recovery of initial respiration rates following defoliation can be either rapid or slow. Therefore, Crawford et al (2000) observed a decrease in barrel medic (Medicago truncatula Gaertn.) R R immediately after defoliation with recovery to predefoliation rates by 8 DAC.…”

Section: Discussionmentioning

confidence: 99%

Partitioning Soil Respiration during Pasture Regrowth

Skinner

2013

Crop Science

View full text Add to dashboard Cite

Understanding the regulation of net ecosystem exchange and soil C sequestration within pasture systems requires knowledge of its component fluxes, including photosynthetic uptake and respiratory loss. However, little information is available on the partitioning of soil respiration (RS) between its heterotrophic respiration (RH) and rhizosphere respiration (RR) components for perennial cool‐season pasture species. The purpose of this study was to use stable C isotopes to examine the effects of regrowth after defoliation on the components of soil respiration for grassland plots planted as an orchardgrass (Dactylis glomerata L.)–white clover (Trifolium repens L.) mixture but dominated by orchardgrass (90 to 100% of harvested biomass). Respiration components were quantified during the first 3 wk following defoliation at the beginning of July in 2010 and 2011. In 2010, RS, RH, and RR were all lowest 1 d after cutting (DAC). Both RS and RH significantly increased by 8 DAC but no further increase occurred over the next 2 wk. In contrast, RR continued to increase throughout the regrowth period. In 2011, RS did not differ among harvests and averaged across dates was less than in 2010. During the 2011 regrowth period RH increased slightly whereas RR did not change significantly. The rhizosphere contribution (RC) to RS averaged 0.49, increasing from 0.35 to 0.56 during regrowth in 2010 but decreasing from 0.62 to 0.43 in 2011. Differences among years in respiration responses during regrowth were possibly due to a combination of factors including resource limitations, soil moisture stress, and differences in soil temperature.

show abstract

The Rhizosphere

2006

Plant Roots

View full text Add to dashboard Cite

Untitled

Cited by 30 publications

References 19 publications

Defoliation Effects on Pasture Photosynthesis and Respiration

Defoliation Effects on Pasture Photosynthesis and Respiration

Partitioning Soil Respiration during Pasture Regrowth

The Rhizosphere

Contact Info

Product

Resources

About