The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Xianhui Zhou - One of the best experts on this subject based on the ideXlab platform.
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composition of the Soil Seed Bank and vegetation changes after wetland drying and Soil salinization on the tibetan plateau
Ecological Engineering, 2012Co-Authors: Xianhui ZhouAbstract:a b s t r a c t The primary goal was to address a question with regard to whether the Seed Bank be regarded as a potential as a source of Seeds for saline–alkaline meadow restoration on the Tibetan Plateau. We collected Soil samples, Soil Seed Bank samples, sampled the vegetation in a seasonal wetland and in a saline–alkaline meadow, and used the NMDS (nonmetric multidimensional scaling) to evaluate the relationship of species composition between the Seed Banks and vegetation. The saline–alkaline meadow develops after drying of wetlands following disturbance. Soil properties, and Seed density and species richness were compared. The Seed density and species richness of the Seed Banks showed no difference between the two habitats. The NMDS results showed that composition of the vegetation of the two sites was obviously different, but that of the Seed Bank was not. The drying of the wetland altered plant community and Soil properties. Persistent Seed Bank can be regarded a strategy of adaptation to current Soil environment (high Soil moisture or salinity). There was a significant negative effect on Soil characteristics after wetland drying and subsequent salinization. If hydrology is restored, the Seed Bank will continue to be an importance source of diversity of propagules for saline–alkaline meadow restoration following disturbance.
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Soil Seed Bank dynamics in alpine wetland succession on the tibetan plateau
Plant and Soil, 2011Co-Authors: Xianhui ZhouAbstract:The primary goal was to address several questions with regard to how Soil Seed Banks change in a successional series. How does the composition of the viable Seed Bank change, and how does the relationship of the Soil Seed Bank and vegetation change with succession? Can the Seed Bank be regarded as a potential as a source of Seeds for wetland restoration? We collected Soil Seed Bank samples and sampled the vegetation in four different successional stages and used the NMDS (nonmetric multidimensional scaling) to evaluate the relationship of species composition between the Seed Banks and vegetation. The difference of Seed density and species richness in different habitats and Soil depths also was compared. Viable Seeds of half (37) the species in the early-successional stage were found in all the successional stages. Similarity between Seed Bank and vegetation increased with succession. Both Seed density and species richness in the Seed Bank increased with successional age and decreased with Soil depth. The majority of species from the early-successional stage produced long-lived Seeds. Seed density and species richness increased with succession, mainly as a result of increasing Seed production, and hypotheses predicting decreasing density of buried Seeds and species richness were not confirmed. Seed Banks play a minor role in contributing to the regeneration of vegetation, and managers cannot rely on Soil-stored Seed Banks for restoration of wetlands.
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role of Soil Seed Bank along a disturbance gradient in an alpine meadow on the tibet plateau
Flora, 2010Co-Authors: Xianhui ZhouAbstract:Abstract We examined the role of the Soil Seed Bank along a grazing disturbance gradient and its relationship with the vegetation of alpine meadows on the Tibet plateau, and discussed the implications for restoration. The Seed Bank had a high potential for restoration of species-rich vegetation; 62 species were identified in the vegetation and 87 in the Seed Bank, 39 species being common to both. Mean Seed density was 3069–6105 viable Seeds m−2. The density of buried Seeds increased significantly with increasing disturbance, indicating that restoration of disturbed areas is not Seed limited. Seed density and species richness decreased with depth. The proportion of perennial species decreased with decrease in disturbance both in Seed Bank and in vegetation. A large portion of species with persistent Seeds in the disturbed areas indicate that this Seed type can be regarded a strategy of adaptation to current disturbances. Detrended correspondence analysis (DCA) showed significant differences of species composition between Seed Bank and vegetation, except for the seriously disturbed site. Our results suggest that the establishment of new species in severely disturbed areas is more dependent on the Seed Bank. By contrast, the restoration in less-disturbed and mature meadows does not rely on Seed Banks, and the establishment of the vegetation in these communities is more likely to rely on Seed dispersal from the standing vegetation and on species with vegetative reproduction.
Kasso Dainou - One of the best experts on this subject based on the ideXlab platform.
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Soil Seed Bank characteristics in two central african forest types and implications for forest restoration
Forest Ecology and Management, 2018Co-Authors: Kasso Dainou, Chauvelin Douh, Jean Joel Loumeto, Jeanmarie Moutsambote, Adeline Fayolle, Felicien Tosso, Eric Forni, Sylvie GourletfleuryAbstract:Abstract This study evaluates the characteristics of Soil Seed Bank in two types of central African rainforests: Celtis forest on clay Soils and Manilkara forest on sandy Soils. In each study site, 30 samples were collected per Soil layers (litter, 0–5 cm, 5–10 cm and 10–20 cm depth). The species diversity and abundance of the Soil Seed Bank were estimated after Soil samples were brought to germination. We globally observed 297 Seedlings of 53 species for the Celtis forest and 222 Seedlings of 39 species for the Manilkara forest. The total densities of germinated Seeds were 330 Seedlings m−2 and 247 Seedlings m−2, respectively. Herbaceous species dominated with percentages of 41.0 and 45.3%, respectively in the Manilkara forest and the Celtis forest. Both forest types displayed a regeneration potential through the Soil Seed Bank. However, this potential seems higher in the Celtis forest. Pioneer taxa were more abundant in the Soil Seed Bank of the Celtis forest (13 woody pioneer species) than the Manilkara forest (9 woody pioneer species). The values of Sorensen similarity index between the standing tree vegetation and the Soil Seed Bank in each site were relatively low: 11.0% for the Celtis forest and 8.8% for the Manilkara forest. But these similarity values were higher when only the pioneer species were considered: 46.8% in the Celtis forest and 38.9% in the Manilkara forest. The highest species richness were obtained in the first two Soil layers (0–10 cm depth) while 21.8% and 21.4% of the species were exclusively found in the deepest layer (10–20 cm) in the Celtis forest and the Manilkara forest, respectively. Among the timber species found in the forest, only three were observed in the Soil Seed Bank of the two sites: Nauclea diderrichii, Erythrophleum suaveolens and Staudtia kamerunensis. N. diderrichii was particularly abundant in the Soil Seed stock of the two sites (14.4–34.4 Seeds m−2). Results suggested that to improve regeneration of timber species, planting in open forest habitats with Seedlings coming from tree nursery should be more efficient.
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Soil Seed Bank characteristics in cameroonian rainforests and implications for post logging forest recovery
Ecological Engineering, 2011Co-Authors: Kasso Dainou, Aline Bauduin, Nils Bourland, Jeanfrancois Gillet, Fousseni Feteke, Jeanlouis DoucetAbstract:a b s t r a c t The Soil Seed Bank is considered as an important component for resilience of climacic vegetation. Whereas several related studies have been conducted in Asian, American and some African tropical forests, no investigation has ever been conducted in Central African rainforests, especially in logged forests where the Soil Seed Bank could contribute to regeneration of timber of trees species. We studied the Soil Seed Bank characteristics in relation to the standing vegetation in three Cameroonian forest zones with dif- ferent disturbance regimes. There was no significant difference between sites in terms of density of the
Mitchell T Aide - One of the best experts on this subject based on the ideXlab platform.
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the effect of distance from forest edge on Seed rain and Soil Seed Bank in a tropical pasture1
Biotropica, 2001Co-Authors: Alejandro Cubina, Mitchell T AideAbstract:Abstract Although lack of Seeds can limit forest recovery in abandoned agricultural lands, few studies have documented the patterns of Seed rain and Soil Seed Bank in active pastures. To determine if lack of Seeds is a limiting factor, we studied the woody species composition of the Seed rain and Soil Seed Bank in an active pasture in Barranquitas, Puerto Rico. In addition, fruit production of 43 common shrub and tree species was monitored in the surrounding secondary forest. Seed rain was monitored for one year at −2, 0, 2, 4, 8, 16, and 32 m from the forest edge along six transects. The Soil Seed Bank was sampled in January/February 1995 and October/November 1995 at the same distances from the forest edge along ten transects. Of the 35 species that produced fruits in the forest, 14 species were detected in the Seed rain study and only 0.3 percent of the Seeds and 3 species dispersed to more than 4 m from the forest edge. Two of the three species were dispersed by wind. The Seed Bank study showed a simil...
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the effect of distance from forest edge on Seed rain and Soil Seed Bank in a tropical pasture1
Biotropica, 2001Co-Authors: Alejandro Cubina, Mitchell T AideAbstract:Although lack of Seeds can limit forest recovery in abandoned agricultural lands, few studies have documented the patterns of Seed rain and Soil Seed Bank in active pastures. To determine if lack of Seeds is a limiting factor, we studied the woody species composition of the Seed rain and Soil Seed Bank in an active pasture in Barranquitas, Puerto Rico. In addition, fruit production of 43 common shrub and tree species was monitored in the surrounding secondary forest. Seed rain was monitored for one year at −2, 0, 2, 4, 8, 16, and 32 m from the forest edge along six transects. The Soil Seed Bank was sampled in January/February 1995 and October/November 1995 at the same distances from the forest edge along ten transects. Of the 35 species that produced fruits in the forest, 14 species were detected in the Seed rain study and only 0.3 percent of the Seeds and 3 species dispersed to more than 4 m from the forest edge. Two of the three species were dispersed by wind. The Seed Bank study showed a similar pattern with a dramatic decrease in Seedling density and species richness with distance from the forest edge. More than 50 percent of the Seedlings in the Seed Bank study were Trema lamarckianum. This study demonstrated that few Seeds disperse into the pastures and even when a rare dispersal event occurs, species do not accumulate because of short-term Seed viability and, possibly, high Seed predation. Studies of early secondary forest regeneration have shown that in some cases, forest can recover rapidly in abandoned agricultural lands; but our results suggest that only a small subset of the forest species will contribute to the initial recovery process.
Julie S Denslow - One of the best experts on this subject based on the ideXlab platform.
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Soil Seed Bank composition along a forest chronosequence in seasonally moist tropical forest panama
Journal of Vegetation Science, 1998Co-Authors: James W Dalling, Julie S DenslowAbstract:. We used a forest chronosequence at the Barro Colorado Nature Monument (BCNM) to examine changes in the abundance and species composition of Seeds in the Soil during forest succession. At each of eight sites varying from 20 yr to 100 yr since abandonment, and at two old-growth (> 500 yr) forest stands, we established two 160-m transects and sampled the surface 0–3 cm of Soil in cores collected at each 5 m interval. Seed densities were estimated from the number of Seedlings germinated from the Soil over a six-week period. Contrary to expectation, neither the density of the Soil Seed Bank, nor species richness or diversity were directly related to age since abandonment, but the density of the Soil Seed Bank was correlated with the abundance of Seed-Bank-forming species in the standing vegetation. In marked contrast to published studies, herbaceous taxa were rare even in the youngest stands, and the common tree species, which accounted for most Seeds in the Soil, were present in all stands. The pioneer tree Miconia argentea (Melastomataceae) was the single most common species in the Seed Bank, accounting for 62% of Seeds and present in 92% of Soil samples. Rapid recovery of the vegetation of young regrowth stands on BCNM, when compared to sites elsewhere may be partly due to allochthonous Seed rain from nearby mature forest stands and the lack of Seed inputs of weeds and grasses from agricultural and pasture lands which may inhibit forest succession.
James W Dalling - One of the best experts on this subject based on the ideXlab platform.
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Soil Seed Bank composition along a forest chronosequence in seasonally moist tropical forest panama
Journal of Vegetation Science, 1998Co-Authors: James W Dalling, Julie S DenslowAbstract:. We used a forest chronosequence at the Barro Colorado Nature Monument (BCNM) to examine changes in the abundance and species composition of Seeds in the Soil during forest succession. At each of eight sites varying from 20 yr to 100 yr since abandonment, and at two old-growth (> 500 yr) forest stands, we established two 160-m transects and sampled the surface 0–3 cm of Soil in cores collected at each 5 m interval. Seed densities were estimated from the number of Seedlings germinated from the Soil over a six-week period. Contrary to expectation, neither the density of the Soil Seed Bank, nor species richness or diversity were directly related to age since abandonment, but the density of the Soil Seed Bank was correlated with the abundance of Seed-Bank-forming species in the standing vegetation. In marked contrast to published studies, herbaceous taxa were rare even in the youngest stands, and the common tree species, which accounted for most Seeds in the Soil, were present in all stands. The pioneer tree Miconia argentea (Melastomataceae) was the single most common species in the Seed Bank, accounting for 62% of Seeds and present in 92% of Soil samples. Rapid recovery of the vegetation of young regrowth stands on BCNM, when compared to sites elsewhere may be partly due to allochthonous Seed rain from nearby mature forest stands and the lack of Seed inputs of weeds and grasses from agricultural and pasture lands which may inhibit forest succession.
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Soil Seed Bank community dynamics in seasonally moist lowland tropical forest panama
Journal of Tropical Ecology, 1997Co-Authors: James W Dalling, M D Swaine, Nancy GarwoodAbstract:Seasonal changes in the densities of dormant Seeds in the Soil around eight pioneer trees in the 50-ha Forest Dynamics Plot, on Barro Colorado Island, Panami were studied, and how Seed dispersal and Seed dormancy influenced patterns of Seed abundance and distribution were examined. Twenty-four, 3-cm-deep Soil samples were collected on 30 m transects radiating out from each of the trees in each of four time-intervals through the year, and four 21-cm-deep samples were collected beneath the focal tree crowns. In the surface 0-3 cm of Soil, germinable Seed densities of all species combined declined from a peak of 1090 Seeds rrT 2 in the mid-wet season in August, to 330 Seeds m" 2 by the end of the wet season in November. In contrast, at Soil depths >3 cm, there was little variation in Soil Seed Bank density through the year. Some variation in Soil Seed Bank density for individual species could be accounted for by distance to reproductive conspecifics. Among species, abundance in the Soil was negatively correlated with Seed size. Seed persistence varied greatly among species at this site; after 1 y of burial in mesh bags, Seed germin- ability of four species was near zero, while four other species showed no consistent decline in Seed germinability after >2 y of burial. For at least one species, Trema micranlha, prolonged Seed dorm- ancy was also possible under natural conditions. Twenty-five percent of Trema Seeds extracted from the Soil at a site occupied by an isolated Trema tree that died between 1982 and 1985 were still germinable in 1994.
