Defining transient and persistent seed banks in species with pronounced seasonal dormancy and germination patterns

2005 ◽  
Vol 15 (3) ◽  
pp. 189-196 ◽  
Author(s):  
Jeffrey L. Walck ◽  
Jerry M. Baskin ◽  
Carol C. Baskin ◽  
Siti N. Hidayati
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Seedling Emergence ◽  
Short Term ◽  
Time Line ◽  
Morphophysiological Dormancy ◽  
Seedling Emergence Method ◽  
To Come ◽  
Persistent Seed Bank

The most often used time-line for distinguishing a transient seed bank from a persistent seed bank is one calendar year. Thus, species whose seeds live in or on the soil for <1 year have a transient seed bank, whereas those whose seeds live for ≥1 year have a persistent seed bank. However, dormancy cycling of seeds buried in soil has not been given due consideration in these models. When dormancy cycling is considered, it is shown that seeds of both autumn-germinators and spring-germinators are in the dormant state when they are 1 year old. Thus, unless the seeds live until at least the second germination season (i.e. usually 16–18 months following dispersal), they are, in effect, part of a transient seed bank, having lived through only one germination season. We propose that for seeds of such species to be considered part of a short-term persistent seed bank, they should remain viable and germinable until at least the second germination season, and to be part of a long-term persistent seed bank, until at least the sixth germination season. Our definitions are applicable to seeds with physiological, physical or morphophysiological dormancy, which often require >1 year after maturity to come out of dormancy in nature. We discuss modifications of the seedling emergence method for detection of a soil seed bank, so that they correspond to our definitions of seed-bank strategies.

Differences between species in seed bank and vegetation helps to hold functional diversity in a floodable Neotropical savanna

2021 ◽  
Author(s):  
Evaldo B de Souza ◽  
Francielli Bao ◽  
Geraldo A Damasceno Júnior ◽  
Arnildo Pott
Keyword(s):  
Functional Diversity ◽  
Seed Bank ◽  
Plant Traits ◽  
Soil Seed Bank ◽  
Seedling Emergence ◽  
Ground Cover ◽  
Environmental Filters ◽  
Functional Richness ◽  
Seedling Emergence Method ◽  
Pantanal Wetland

Abstract Aims Our objective was to quantify the contributions of the seed bank and the established vegetation to the species composition, functional composition and diversity, and discuss the implications of these differences in regeneration and persistence of floodplain plant communities. Methods We sampled all ground cover vegetation up to 1.5 m height and seed bank in 25 plots (10 m × 1 m) distributed across five sites in dry and rainy seasons in a periodically flooded savanna in the Pantanal wetland, Brazil. We evaluated the soil seed bank by seedling emergence method. Important Findings The seed bank species had traits that conferred regeneration to the communities, while persistence traits characterized the vegetation. The seed bank had higher functional richness and lower functional evenness than the vegetation. The existence of different plant traits between seed bank and vegetation allowed the coexistence of species with functionally contrasting persistence and regeneration traits, which may help maintain functional diversity. It may allow the community to be more resilient when dealing with different environmental filters such as drought, fire and flood.

scholarly journals Banco de semillas después de un incendio en un matorral xerófilo

2019 ◽  
Vol 86 ◽  
pp. 11
Author(s):  
Yuriana Martínez Orea ◽  
Silvia Castillo Argüero ◽  
M. Patricia Guadarrama Chávez ◽  
Irene Sánchez
Keyword(s):  
Seed Bank ◽  
Life Form ◽  
Soil Seed Bank ◽  
Seedling Emergence ◽  
Species Number ◽  
Seedling Emergence Method ◽  
Perennial Herbs ◽  
Abundance And Diversity ◽  
One Year ◽  
Determinant Factor

Through the seedling emergence method we studied the effects of fire on the soil seed bank of a xerophytic shrubland in two consecutive years. We compared its composition and abundance in two sites, one burned and one unburned. An important proportion of seeds died due to the high temperatures reached by fire. In addition, species richness and, diversity were also negatively affected. These variables showed statistical differences between sites and years. After one year, seed bank abundance and diversity reached higher values. Dominant species were perennial herbs in terms of species number, and in terms of seedling abundance the dominant life form was a tree. However, fire was not a determinant factor in terms of species composition. These results are important to explain the changes in vegetation after a fire, specially if we consider that this site is a natural preserve immersed in an urban area.

Seed persistence in the soil on eroded slopes in the hilly-gullied Loess Plateau region, China

2011 ◽  
Vol 21 (4) ◽  
pp. 295-304 ◽  
Author(s):  
Ning Wang ◽  
Ju-Ying Jiao ◽  
Yan-Feng Jia ◽  
Dong-Li Wang
Keyword(s):  
Loess Plateau ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Seed Shape ◽  
Plateau Region ◽  
Soil Seed Banks ◽  
Persistent Soil Seed Bank ◽  
Disturbed Habitats ◽  
Persistent Seed Bank

AbstractThe soil seed-bank is an important component of vegetation dynamics. Its presence affects both ecosystem resistance and resilience. A persistent seed-bank is especially important in disturbed habitats and harsh environments. In the hilly-gullied Loess Plateau region, serious soil erosion causes decreases in soil water capacity and constrains vegetation recolonization. A stable and long-term persistent soil seed-bank is necessary for natural vegetation recolonization. We used an integrated measure of the depth distribution of seeds in the soil and the seasonal dynamics of soil seed-banks to analyse the persistence of seeds in soil and to investigate the correlation of seed longevity with seed size/shape and the species' life history. The results showed a significant tendency for small seeds and seeds of annuals/biennials to persist longer in soil than large seeds and seeds of perennials. However, seed shape was not related to persistence. The main dominant speciesArtemisia scoparia, Lespedeza davurica, Heteropappus altaicus, Stipa bungeana, Artemisia gmelinii, and Bothriochloa ischaemun in the different successional stages in this region can form a persistent and stable soil seed-bank. The pioneer species A. scoparia is especially significant because it can form a large, long-term, persistent seed-bank. These species can play a role in the recolonization of the eroded abandoned slope lands by vegetation.

Improvement of the seedling emergence method in soil seed bank studies using chemical treatments

2020 ◽  
Vol 21 (2) ◽  
pp. 183-190
Author(s):  
Reza Erfanzadeh ◽  
Maryam Daneshgar ◽  
Hassan Ghelichnia
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Seedling Emergence ◽  
Chemical Treatments ◽  
Seedling Emergence Method

Effects of heat and smoke on germination of soil-stored seed in a south-eastern Australian sand heathland

2002 ◽  
Vol 50 (2) ◽  
pp. 197 ◽  
Author(s):  
Timothy J. Wills ◽  
Jennifer Read
Keyword(s):  
Seed Germination ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Seedling Emergence ◽  
Type Systems ◽  
Treated Soil ◽  
South Eastern ◽  
Heat Treated ◽  
Eastern Australia ◽  
And Control

Various fire-related agents, including heat, smoke, ash and charred wood, have been shown to break dormancy and promote germination of soil-stored seed in a broad range of species in mediterranean-type systems. However, relatively little work has been conducted in south-eastern Australian heathlands. This study examined the effects of heat and smoked water on germination of the soil seed bank in a mature sand heathland within the Gippsland Lakes Coastal Park, in south-eastern Australia. Heat was clearly the most successful treatment for promoting seed germination, followed by smoked water, then controls, with 55% of species present in the germinable soil seed bank requiring a heat or smoke stimulus to promote seed germination. Mean species richness of the germinable soil seed bank was found to be significantly higher in heat-treated soil than in smoke and control treatments. Seedling density of heat-treated soil was almost 10 times that of controls, while smoke-treated soil was almost five times that of controls. Seedling emergence was fastest in heat-treated soil, followed by smoke and control soils. Of the species found in the soil seed bank, 25% were absent from the extant vegetation, suggesting the existence of post-fire colonisers in the soil seed bank. The results have implications for the design of soil seed bank experiments and the use of fire as a tool in vegetation management.

scholarly journals Implikasi Penerapan Undang-Undang Nomor 11 Tahun 2016 Tentang Pengampunan Pajak (Tax Amnesty) Dalam Meningkatkan Kepatuhan Wajib Pajak

2017 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Agus Saiful Abib ◽  
Efi Yulistyowati ◽  
Amri Panahatan Sihotang
Keyword(s):  
Secondary Data ◽  
Fiscal Year ◽  
Tax Revenue ◽  
Short Term ◽  
Descriptive Research ◽  
Tax Amnesty ◽  
The Government ◽  
To Come ◽  
National Tax

<p>Tahun 2016, pemerintah mengeluarkan kembali kebijakan <em>Tax</em> <em>Amnesty </em>yang dituangkan dalam Undang-Undang Nomor 11 Tahun 2016 tentang Pengampunan Pajak. Pengampunan Pajak (<em>Tax</em> <em>Amnesty)</em> ini diharapkan dapat meningkatkan penerimaan pajak dalam jangka pendek melalui pembayaran uang tebusan, meningkatkan penerimaan pajak dalam jangka panjang melalui perluasan basis data pemajakan, meningkatkan kepatuhan Wajib Pajak, transisi ke sistem perpajakan baru yang lebih kuat dan adil, dan mendorong rekonsiliasi perpajakan nasional. Sehubungan dengan hal tersebut, untuk mengetahui apakah program <em>Tax</em> <em>Amnesty</em> Indonesia Tahun 2016 berhasil atau tidak, khususnya dalam meningkatkan kepatuhan wajib pajak, maka perlu dilakukan penelitian tentang : “Implikasi Penerapan Undang-Undang Nomor 11 Tahun 2016 tentang Pengampunan Pajak (<em>Tax</em> <em>Amnesty</em>) dalam Meningkatkan Kepatuhan Wajib Pajak”. Adapun permasalahan yang akan dibahas adalah bagaimana implikasi penerapan Undang-Undang Nomor 11 Tahun 2016 tentang Pengampunan Pajak<em> (Tax</em> <em>Amnesty)</em> dalam meningkatkan kepatuhan Wajib Pajak ? Berdasarkan implikasi tersebut, maka bagaimana sebaiknya pengaturan perpajakan yang akan datang ? Berdasarkan permasalahan tersebut jenis penelitian ini adalah yuridis normatif yang akan dikaji dengan pendekatan perundang-undangan, spesifikasi penelitiannya diskriptif analitis, data yang dipergunakan data sekunder, yang dianalisis secara kualitatif. Hasil penelitian menunjukkan bahwa implikasi penerapan Undang-Undang Nomor 11 Tahun 2016 tentang Pengampunan Pajak<em> (Tax</em> <em>Amnesty)</em> dapat meningkatkan kepatuhan Wajib Pajak, dan berdasarkan implikasi tersebut SE Dirjen Pajak No. SE - 06/PJ/2017 seharusnya tidak hanya untuk tahun pajak 2017 saja, tetapi juga untuk tahun-tahun yang akan datang. Di samping itu perlu ada peraturan yang mengatur tentang pengawasan terhadap pelaksanaan hak Wajib Pajak.</p><pre>In 2016, the government re-issue the Tax Amnesty policy as outlined in Law Number 11 Year 2016 on Tax Amnesty. The Tax Amnesty is expected to increase tax revenue in the short term through ransom payments, increase tax revenues over the long term through the expansion of taxation databases, increase taxpayer compliance, transition to a stronger and more just tax system, and encourage national tax reconciliation. In relation to this matter, to find out whether the program of Tax Amnesty Indonesia Year 2016 succeed or not, especially in increasing taxpayer compliance, it is necessary to do research on: "Implications Implementation of Law Number 11 Year 2016 on Tax Amnesty in Improving Taxpayer Compliance ". The problem to be discussed is how the implications of the implementation of Law Number 11 Year 2016 on Tax Amendment (Tax Amnesty) in improving taxpayer compliance? Based on these implications, then how should the taxation arrangements to come? Based on the problem, this type of research is normative juridical which will be studied with the approach of legislation, the analytical descriptive research specification, the data used secondary data, which analyzed qualitatively. The result of the research shows that the implication of the implementation of Law Number 11 Year 2016 on Tax Amnesty can improve Taxpayer compliance, and based on the implication of SE Dirjen Pajak No. SE - 06 / PJ / 2017 should not only be for the fiscal year 2017 alone, but also for the years to come. In addition, there should be a regulation that regulates the supervision of the implementation of taxpayers' rights.</pre>

scholarly journals Vegetation and seed bank dynamics highlight the importance of post-restoration management in sown grasslands

2020 ◽  
Author(s):  
Orsolya Valkó ◽  
Balázs Deák ◽  
Péter Török ◽  
Katalin Tóth ◽  
Réka Kiss ◽  
...  
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Rapid Development ◽  
Management Plan ◽  
Landscape Scale ◽  
List Type ◽  
Restoration Management ◽  
Seed Bank Dynamics ◽  
Term Management

AbstractSowing grass seeds generally supports the rapid development of a closed perennial vegetation, which makes the method universally suitable for fast and effective landscape-scale restoration of grasslands. However, sustaining the recovered grasslands, and increasing their diversity is a challenging task. Understanding the role of seed bank compositional changes and vegetation dynamics contributes to designating management regimes that support the establishment of target species and suppress weeds. Our aim was to reveal the effect of post-restoration management on the vegetation and seed bank dynamics in grasslands restored in one of the largest European landscape-scale restoration projects. Eight years after restoration we sampled the vegetation and seed bank in a total of 96 plots located in 12 recovered grasslands in the Great Hungarian Plain. In each recovered grassland stand we designated a mown (mown from Year 1 to Year 8) and an abandoned sample site (mown from Year 1 to Year 3 then abandoned from Year 4 to Year 8). Mown and abandoned sites showed divergent vegetation and seed bank development. Abandonment led to the decline of sown grasses and higher cover of weeds, especially in the alkaline grasslands. Our study confirmed that seed bank has a limited contribution to the maintenance of biodiversity in both grassland types. We found that five years of abandonment had a larger effect on the seed bank than on the vegetation. We stress that long-term management is crucial for controlling the emergence of the weeds from their dense seed bank in restored grasslands.Implications for practiceSeed sowing of grass mixtures can be a feasible tool for restoring grasslands at large scales. However, the developed vegetation usually has low biodiversity and a high seed density of weeds is typical in the soil seed bank even several years after the restoration. Therefore, post-restoration management is necessary for suppressing weeds both aboveground and belowground.We recommend to design the long-term management of the sites subjected to grassland restoration already in the planning phase of the restoration projects and ensure that the management plan is ecologically and economically feasible.We recommend to complement the monitoring of vegetation with the analysis of soil seed bank for evaluating restoration success.

scholarly journals Nemo-Nordic 1.0: A NEMO based ocean model for Baltic & North Seas, research and operational applications

2018 ◽  
Author(s):  
Robinson Hordoir ◽  
Lars Axell ◽  
Anders Höglund ◽  
Christian Dieterich ◽  
Filippa Fransner ◽  
...  
Keyword(s):  
Climate Change ◽  
Ocean Model ◽  
Anthropogenic Pressure ◽  
Short Term ◽  
To Come ◽  
Ocean Forecasting ◽  
The Baltic ◽  
Industrialised Countries ◽  
High Degree

Abstract. We present Nemo-Nordic, a Baltic &amp; North Sea model based on the NEMO ocean engine. Surrounded by highly industrialised countries, the Baltic and North seas, and their assets associated with shipping, fishing and tourism; are vulnerable to anthropogenic pressure and climate change. Ocean models providing reliable forecasts, and enabling climatic studies, are important tools for the shipping infrastructure and to get a better understanding of effects of climate change on the marine ecosystems. Nemo-Nordic is intended to come as a tool for both short term and long term simulations, and to be used for ocean forecasting as well as process and climatic studies. Here, the scientific and technical choices within Nemo-Nordic are introduced, and the reasons behind the design of the model and its domain, and the inclusions of the two seas, are explained. The model's ability to represent barotropic and baroclinic dynamics, as well as the vertical structure of the water column, is presented. Biases are shown and discussed. The short term capabilities of the model are presented, and especially its capabilities to represent sea level on an hourly timescale with a high degree of accuracy. We also show that the model can represent longer time scale, with a focus on the Major Baltic Inflows and the variability of deep water salinity in the Baltic Sea.

Changes in the Soil Seed Bank of Four Long-Term Crop/Herbicide Experiments

1981 ◽  
Vol 18 (2) ◽  
pp. 661 ◽  
Author(s):  
H. A. Roberts ◽  
June E. Neilson
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank
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