Leaf litter plays an important role in soil health by replenishing nutrients through decomposition. This process can occur anaerobically without oxygen or aerobically with oxygen present. Aerobic decomposition is most common in nature. It involves organisms using oxygen to break down leaf litter, utilizing nutrients for growth while releasing carbon dioxide. Multiple factors influence decomposition rates, including temperature, moisture, litter quality, and the activity of soil invertebrates and microbes that vary seasonally. Fast growing trees can produce high quantities of leaf litter that peaks in certain seasons depending on species and climate.
This topic is related with environmental science. It consists of definition, types, characteristic features with accurate examples and pictures. Differentiating definition between the two.
Ecades and ecotype - Ecades•introduction •Definition•Explanation•types of ecades , Ecotype, • introduction, •Definition ,•Ecotype VS. species ,•How did ecotype appear ,•From ecotype to species, •Example
despite of the enormous genomic diversity, the phage genome mapping is being done using a plethora of techniques,which includes both genetic mapping and physical mapping
From its initiation in 1998, the Angiosperm Phylogeny Group (APG) has focused on the production of an ever-more stable system of classification of the flowering plants (angiosperms). Based largely on analyses of DNA sequence data, the system is compiled by a larger group of experts than any previous system and has the advantage of being testable, allowing for confidence levels in the system to be estimated for the first time.
This topic is related with environmental science. It consists of definition, types, characteristic features with accurate examples and pictures. Differentiating definition between the two.
Ecades and ecotype - Ecades•introduction •Definition•Explanation•types of ecades , Ecotype, • introduction, •Definition ,•Ecotype VS. species ,•How did ecotype appear ,•From ecotype to species, •Example
despite of the enormous genomic diversity, the phage genome mapping is being done using a plethora of techniques,which includes both genetic mapping and physical mapping
From its initiation in 1998, the Angiosperm Phylogeny Group (APG) has focused on the production of an ever-more stable system of classification of the flowering plants (angiosperms). Based largely on analyses of DNA sequence data, the system is compiled by a larger group of experts than any previous system and has the advantage of being testable, allowing for confidence levels in the system to be estimated for the first time.
Ecophysiological Effects of Changing Atmospheric Carbon Dioxide ConcentrationAsad Afridi
this presentation is about Carbon Dioxide. different effects of carbon dioxide are discussed in this presentation. such as effects on different plants, animals and environment.
In this presentation, climatic factors like light, temperature and water are explained. Along with this their importance and their effect on plant life is also explained
Embyrology in relation to Taxonomy. It is one of the concepts in Modern Taxonomy.in which embryological data is used to strengthen existing classification system.
Ecophysiological Effects of Changing Atmospheric Carbon Dioxide ConcentrationAsad Afridi
this presentation is about Carbon Dioxide. different effects of carbon dioxide are discussed in this presentation. such as effects on different plants, animals and environment.
In this presentation, climatic factors like light, temperature and water are explained. Along with this their importance and their effect on plant life is also explained
Embyrology in relation to Taxonomy. It is one of the concepts in Modern Taxonomy.in which embryological data is used to strengthen existing classification system.
Ecosystem Ecology lecture for Botany, Zoology, Environmental Sciences, and Chemistry Students by Salman Saeed lecturer Botany University College of Management and Sciences Khanewal, Pakistan.
About Author: Salman Saeed
Qualification: M.SC (Botany), M. Phil (Biotechnology) from BZU Multan.
M. Ed & B. Ed from GCU Faisalabad, Pakistan.
The scientific study of the distribution and abundance of living organisms and how the distribution and abundance are affected by interactions between the organisms and their environment.
Eric Olson, Brandeis University
Biodiversity contributes significantly to our resilience and quality of life. Eric Olson addresses the presence of countless non-native species of plants and animals in our cities, how we can take steps to re-establish healthy ecological species relationships one yard at a time, and how our local climate can benefit.
Presented at the Urban and Suburban Carbon Farming to Reverse Global Warming conference at Harvard University on May 3, 2015, organized by Biodiversity for a Livable Climate.
www.bio4climate.org
1. What roles does succession and phytoremediation play in ecology, .pdfarakalamkah11
1. What roles does succession and phytoremediation play in ecology, evolution and the
ecosystems?
Succession plays a major role to change in environmental conditions that causes a pronounced
change in an ecosystem. Disturbances often act quickly and with great effect, to alter the
physical structure or arrangement of biotic and abiotic elements. Disturbance can also occur over
a long period of time and can impact the diversity within an ecosystem. Major ecological
disturbances may
include fires, flooding, windstorms, insect outbreaks and trampling. Earthquakes, various types
of volcanic eruptions, tsunami, firestorms, impact events, climate change, and the devastating
effects of human impact on the environment (anthropogenic disturbances) such as clear cutting,
forest clearing and the introduction of invasive species can be considered major disturbances.
This can be attributed to physical changes in the biotic and abiotic conditions of an ecosystem.
Because of this, a disturbance force can change an ecosystem for significantly longer than the
period over which the immediate effects persist. With the passage of time following a
disturbance, shifts in dominance, shifts in dominance may occur with ephemeral herbaceous life-
forms progressively becoming over topped by taller perennials herbs, shrubs and trees. However,
in the absence of further disturbance forces, many ecosystems will trend back toward pre-
disturbance conditions. Long lived species and those which can regenerate in the presence of
their own adults will finally become dominant. Such alteration, accompanied by changes in the
abundance of different species over time, is called ecological succession. Succession often leads
to conditions that will once again predispose an ecosystem to disturbance.
Phytoremediation play a major role to clean up contaminated environments including metals,
pesticides, explosives, and oil. Also help prevent wind, rain, and groundwater flow from carrying
contaminants away from the site to surrounding areas or deeper underground. Certain plants are
able to remove or break down harmful chemicals from the ground when their roots take in water
and nutrients from the contaminated soil, sediment, or groundwater. Plants can help clean up
contaminants as deep as their roots can reach using natural processes to:
• Store the contaminants in the roots, stems, or leaves.
• Convert them to less harmful chemicals within the plant or, more commonly, the root zone. •
Convert them to vapors, which are released into the air.
• Sorb (stick) contaminants onto their roots where very small organisms called “microbes” (such
as bacteria) that live in the soil break down the sorbed contaminants to less harmful chemicals.
2. Biogeochemical cycles, succession and phytoremediation. Explain how all three work together
for a positive outcome.
Biological diversity is dependent on natural disturbance. The success of a wide range of species
from all taxonomic groups is closely tied to na.
description on convention on biological diversity, different articles, conference of parties, global environment facility, cartagena protocol, CBD Act 2002, National Biodiversity Strategies and Action Plans (NBSAP)
application of biofertilizers in forest nursery. Different types of biofertilizers and application methods. advantages and disadvantages of biofertilizers.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
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A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
"Protectable subject matters, Protection in biotechnology, Protection of othe...
Leaf litter decomposition in agroforestry systems
1. Leaf litter decomposition in agroforestry system
Submitted by:-
S.S.R Tripathy
o1SAF/16
2nd year MSc. Forestry
2. Leaf litter:-
Litter fall, plant litter, leaf litter, tree litter, soil litter, or duff, is dead plant material, such
as leaves, bark, needles, twigs, and cladodes; that have fallen to the ground. This
detritus or dead organic material and its constituent nutrients are added to the top layer
of soil, commonly known as the litter layer or O horizon ("O" for "organic").
Leaf litter can be a critical element of soil. Leaving leaves to decompose replenishes
soil by releasing carbon, nitrogen, phosphorus and other inorganic compounds. The
decomposition process can also foster interesting forms of life, like fungus, which often
thrive in decaying leaf material.
Leaf litter also helps to retain moisture and regulate temperature. This is important in
cold regions where organisms live under leaf litter during the winter, and where plants
can receive some protection from extreme temperatures under a blanket of leaves.
3.
4.
5. LEAF LITTER DECOMPOTION
• Decomposition is a multistage process initiates with leaching by water liberating soluble
carbon compounds. Another early process is physical breakup or fragmentation of the
plant material into smaller bits which have greater surface area for microbial
colonization and attack.
• In smaller dead plants, this process is largely carried out by the soil invertebrate fauna,
whereas in the larger plants, primarily parasitic life-forms such as insects and fungi play
a major breakdown role and are not assisted by numerous detrivore species.
• Following this, the plant detritus (consisting of cellulose, hemicellulose, microbial
products, and lignin) undergoes chemical alteration by microbes. Different types of
compounds decompose at different rates.
• This is dependent on their chemical structure. For instance, lignin is a component of
wood, which is relatively resistant to decomposition and can in fact only be decomposed
by certain black-rot fungi.
6. Continue…
• Wood decomposition is a complex process involving fungi which transport nutrients
to the nutritionally scarce wood from outside environment. Because of this
nutritional enrichment the fauna of saproxylic insects may develop and in turn
affect dead wood, contributing to wood decomposition and nutrient cycling in the
forest floor.
• Lignin is one such remaining product of decomposing plants with a very complex
chemical structure causing the rate of microbial breakdown to slow. Warmth
determines the speed of plant decay, with the rate of decay increasing as heat
increases, i.e. A plant in a warm environment will decay over a shorter period of
time.
• In most grassland ecosystems, natural damage from fire, insects that feed on
decaying matter, termites, grazing mammals, and the physical movement of animals
through the grass are the primary agents of breakdown and nutrient cycling, while
bacteria and fungi play the main roles in further decomposition.
7. LEAF LITTER DECOMPOTION PROCESS
• Generally speaking there are two processes of leaf litter decompotion:
1.ANAEROBIC (without oxygen) decomposition
2. AEROBIC (with oxygen) decomposition and stabilization
8. Anaerobic decomposition
• Anaerobic decomposition takes place in nature, as in the decomposition of the
leaf litter at the bottom of marshes and in buried leaf litter to which oxygen
does not have access. Intensive reduction of leaf litter is usually accompanied
by disagreeable odours of hydrogen sulphide and reduced organic compounds
which contain Sulphur, such as mercaptans (any Sulphur-containing organic
compound).
• Organic compounds break down by the action of living organisms that do not
require air in the normal sense. These organisms use nitrogen, phosphorus, and
other nutrients to live and to develop cell protoplasm, but they reduce the
organic nitrogen to organic acids and ammonia.
• The carbon from the organic compounds which is not utilized in the cell
protein is liberated mainly in the reduced form of methane (CH4). A small
portion of carbon may be respired as carbon dioxide (C02).
9. 2. AEROBIC (with oxygen) decomposition and stabilization:-
• When leaf litter decompose in the presence of oxygen, the process is called
“aerobic.” The aerobic process is most common in nature. For example, it takes
place on ground surfaces such as the forest floor, where droppings from trees and
animals are converted into a relatively stable humus. There is no accompanying
bad smell when there is adequate oxygen present.
• In aerobic decomposition organisms which use oxygen, feed upon the leaf litter.
They use the nitrogen, phosphorus, some of the carbon, and other required
nutrients. Much of the carbon serves as a source of energy for the organisms and is
burned up and respired as carbon dioxide (C02).
• carbon serves both as a source of energy and as an element in the cell protoplasm,
much more carbon than nitrogen is needed. Generally about two-thirds of carbon
is respired as C02, while the other third is combined with nitrogen in the living
cells. However, if the excess of carbon over nitrogen (C:N ratio) in organic
materials being decomposed is too great, biological activity diminishes. Several
cycles of organisms are then required to burn most of the carbon.
11. Factors affecting leaf litter fall:-
• Although decomposition is predominantly a microbial process, soil and leaf litter
invertebrates enhance leaf litter decomposition by physically breaking up the organic
material and stimulating microbial activity (Anderson et al. 1983, Berg and
McClaugherty 2014).
• Globally, the relative importance of this faunal effect is known to increase with
increasing total precipitation and minimum temperature (Garcıa-Palacios et
al.2013). Locally, the faunal effect is determined by the composition, abundance, and
activity of the soil fauna, which in turn are partially dependent on the abiotic micro-
environment, in particular the temperature and moisture content of the litter (Gonza
lez and Seastedt 2001).
• However, the contribution of invertebrates to decomposition also varies with litter
quality, with a larger effect reported for more rapidly decom- posing litter (Yang and
Chen 2009, Handa et al. 2014).
• Abundance of the soil and litter invertebrate fauna also varies seasonally and may
be partially responsible for seasonal dynamics in litter decomposition rates (Seastedt
and Crossley 1980).
12. Continue…
• Decomposition rates also vary seasonally, as a consequence of changes in litter
temperature and moisture (Rozema et al. 1999, Rigobelo and Nahas 2004, Eviner
et al. 2006), resulting in higher wet season mass loss across a range of forest types
(Bernhard Reversat 1982, Seastedt et al. 1983, Torres et al. 2005).
• Low precipitation can limit leaching of the dissolved organic material from the
litter, as well as reducing the activity of decomposers (Rigobelo and Nahas 2004).
De- composer activity may also be affected by the seasonal differences in
substrate supply and quality (Schmidt et al. 2007).
• In addition, microbial communities are specific to the different stages of
decomposition, because the chemical composition and physical properties of litter
changes over the course of decomposition (Griffith and Boddy 1990, Berg and
McClaugherty2014).
13. Continue…
• Fast growing trees like eucalyptus can produce very high quantities of litter
(Binkerly et al., 1992; Tokay and Singh, 1993).
• Litter fall is generally low before the rise of green crown that commences
around canopy closure. It can be seasonal or continuous (Wedderburn and
Carter, 1999) depending on species (deciduous or evergreen) and climate.
• Eucalyptus litter fall often peaks in summer in both plantations (George and
Varghese, 1990; Toky and Singh, 1993) and in native forests (Ashton, 1975;
Attiwii et al 1996).