Seasonal fluctuations of vegetative growth in roots and shoots of central Chilean shrubs

Montenegro, Gloria; Araya, Sandra; Aljaro, María E.; Ávila, Guacolda

doi:10.1007/bf00545669

Cited by 15 publications

(7 citation statements)

References 8 publications

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“…These results agree with previous studies on root phenology of Mediterranean and desert plants (Evenari, 1938;Kummerow et al, 1978;Montenegro et al, 1982;Wan et al, 2002;Wilcox et al, 2004), emphasizing the importance of water availability for fine root growth in arid environments.…”

Section: Fine Root Growthsupporting

confidence: 94%

“…These species showed a certain fine root growth in spring in addition to the growth peak of autumn, similarly to what happens on Mediterranean shrublands from California and France (Kummerow et al, , 1990. Likewise, plants form the Chilean matorral had higher fine root biomass in spring than in autumn, but autumn was the main period for fine root biomass gain (Montenegro et al, 1982). Therefore, a trade-off appears to exist between the length of the aboveground phenological cycle and the degree of overlap between root and shoot growth periods (RSOI).…”

Section: Relationship Between Above and Belowground Phenologymentioning

confidence: 50%

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Above and belowground phenology of four Mediterranean sub-shrubs. Preliminary results on root–shoot competition

Palacio¹,

Montserrat-Martı́²

2007

Journal of Arid Environments

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Section: Fine Root Growthsupporting

confidence: 94%

Section: Relationship Between Above and Belowground Phenologymentioning

confidence: 50%

Above and belowground phenology of four Mediterranean sub-shrubs. Preliminary results on root–shoot competition

Palacio¹,

Montserrat-Martı́²

2007

Journal of Arid Environments

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“…Differences in the season of peak nematode numbers among the sites, and between surface and deep soil within sites, may indicate differences in root phenology and other processes linked with root activities such as mineralization. Plant root distribution and growth varies seasonally and is not always synchronized with shoot growth (Montenegro et al 1982). In multispecies, shallow-rooted systems such as the grassland site, root overlap between shrubs and herbaceous plants having different seasons of peak root activity, e.g., winter and summer annuals, may act to stabilize nematode populations by maintaining a continuous resource availability.…”

Section: Discussionmentioning

confidence: 99%

“…Plant root distribution and growth varies seasonally and is not always synchronized with shoot growth (Montenegro et al 1982). Plant root distribution and growth varies seasonally and is not always synchronized with shoot growth (Montenegro et al 1982).…”

Section: Correlation Coefficients For Relationships Between Ectoparasmentioning

confidence: 99%

Plant-Feeding Nematodes in Deep-Rooting Desert Ecosystems

Freckman

Virginia

1989

Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 128.235.Abstract. In the Chihuahuan Desert of southern New Mexico, mesquite (Prosopis glandulosa) occurs in a variety of landscape positions where water may accumulate to varying depths. The structure of Chihuahuan Desert landscapes has changed dramatically in the past 100 yr with mesquite expanding from its original distribution (playa, arroyo) into grassland and dune ecosystems. Our objective was to examine spatial and seasonal distribution of plant-feeding nematodes and the potential importance of herbivory in four mesquite communities (playa, arroyo, dunes, grassland) hypothesized to differ in rooting depth and distribution. These sites were compared to a more shallow-rooted creosote bush (Larrea tridentata) community. Intact soil cores were recovered to depths of 13 m beneath the canopies of mesquite or creosote bush using a continuous sampling tube drilling system in the winter, spring, and fall on the Jorada LTER site, Las Cruces, New Mexico.Nematode density and root mass decreased with depth. Nematodes were found to the maximum depth of recovered roots only at the playa (11-12 m) and occurred as deep as 5-6 m at the arroyo, 2-3 m at the dunes, and 1-2 m at the grassland and creosote bush sites. At the playa, 75% of the nematodes and 90% of the roots were below 0.5 m, whereas, in the creosote bush system 79% of the roots and 99.7% of the nematodes were recovered in the upper 0.5 m of soil. Nematode diversity (seven genera) and endoparasite densities were greatest at the playa. Only ectoparasites (three genera) were found at the creosote bush system. Total nematodes across all sites were highly correlated with total soil N, NH4+, and P04-3, but not NO3-. Nematodes were not positively correlated with soil moisture. Potential herbivory was best described by nematode numbers per gram root or an herbivory index (based on nematode density weighted by an impact factor for each genus), rather than the ratio of endoparasite:ectoparasite numbers. The herbivory index decreased in the order playa > creosote bush > dune > grassland > arroyo.The movement of mesquite into new habitats (grassland, dunes) is associated with shallow rooting, and relative to the playa, a greater allocation of roots to the upper 0.5 m soil layer, a decrease in nematode herbivory and diversity, and, a failure of the nematodes to be distributed throughout the entire rooting zone. The densities ofecto-and endoparasites varied with site, thus, plant-feeding nematodes should not be treated as a single guild since they have different effects on roots. Our study shows that in some ecosystems the majority of herbivory may occur at soil depths rarely studied. Although technically difficult ...

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“…Due to the fact that most of the species were intimately known from previous investigations Montenegro et al, 1980 ;Kummerow and Montenegro, 1981) it was possible to determine practically ali the monocharacter growth form types. (Montenegro and Riveros, 1977 ;Avila and Aljaro, 1977 ;Montenegro et al, 1979 b ;Hoffmann and Walker, 1980 ;Montenegro et al, 1981 ;Aljaro and Montenegro, 1981 ;Avila et al, 1978 a ;Avila et al, 1978 b;Kummerow et al, 1982;Montenegro et al, 1982).…”

Section: Methodsmentioning

confidence: 99%

Plant Growth Forms of Chilean Matorral A Monocharacter growth form analysis along an altitudinal transect from sea level to 2000 M.A.S.L.

Orshan

Montenegro

Ávila

et al. 1984

Bulletin de la Société Botanique de France. Actualités Botaniqu

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Seasonal fluctuations of vegetative growth in roots and shoots of central Chilean shrubs

Cited by 15 publications

References 8 publications

Above and belowground phenology of four Mediterranean sub-shrubs. Preliminary results on root–shoot competition

Above and belowground phenology of four Mediterranean sub-shrubs. Preliminary results on root–shoot competition

Plant-Feeding Nematodes in Deep-Rooting Desert Ecosystems

Plant Growth Forms of Chilean Matorral A Monocharacter growth form analysis along an altitudinal transect from sea level to 2000 M.A.S.L.

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