Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

Opio, Alfonse; Jones, B. M.; Kansiime, Frank; Otiti, Tom

doi:10.5897/ajps2016.1422

Cited by 3 publications

(3 citation statements)

References 24 publications

(28 reference statements)

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“…The experiments ran in between the so called short and long rainy seasons, although because of variability in the rainfall patterns in Nyando and Mara the seasons are not always very distinct (Gabrielsson et al, 2013). According to Opio et al (2017), productivity of papyrus was not affected much by seasonal variations.…”

Section: Discussionmentioning

confidence: 99%

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The effect of seasonal flooding and livelihood activities on retention of nitrogen and phosphorus in Cyperus papyrus wetlands, the role of aboveground biomass

et al. 2021

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With growing demand for food production in Africa, protecting wetlands and combining increased agricultural production with conservation of the ecological integrity of wetlands is urgent. The role of aboveground biomass of papyrus (Cyperus papyrus) in the storage and retention of nitrogen (N) and phosphorus (P) was studied in two wetland sites in East Africa under seasonally and permanently flooded conditions. Nyando wetland (Kenya) was under anthropogenic disturbance from agriculture and vegetation harvesting, whereas Mara wetland (Tanzania) was less disturbed. Maximum papyrus culm growth was described well by a logistic model (regressions for culm length with R2 from 0.70 to 0.99), with culms growing faster but not taller in Nyando than in Mara. Maximum culm length was greater in permanently than in seasonally flooded zones. Total aboveground biomass was higher in Mara than in Nyando. The amounts of N and P stored were higher in Mara than in Nyando. In disturbed sites, papyrus plants show characteristics of r-selected species leading to faster growth but lower biomass and nutrient storage. These findings help to optimize management of nutrient retention in natural and constructed wetlands.

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Section: Discussionmentioning

confidence: 99%

“…1). While the impact of environmental conditions on biomass and density of papyrus has been studied (Gaudet, 1975;Muraza et al, 2013;Opio et al, 2017;Geremew et al, 2018), there is no data on the effect of disturbances on N and P content of culms of the different growth stages.…”

Section: Introductionmentioning

confidence: 99%

The effect of seasonal flooding and livelihood activities on retention of nitrogen and phosphorus in Cyperus papyrus wetlands, the role of aboveground biomass

et al. 2021

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“…Papyrus culms can grow very fast (up to 4-5 m within about 6 months) and typically exhibit six vegetative growth stages (Figure 2.1). While the impact of environmental conditions on biomass and density of papyrus has been studied (Gaudet, 1975;Muraza et al, 2013;Opio et al, 2017;Geremew et al, 2018), there is no data on the effect of disturbances on N and P content of culms of the different growth stages.…”

Section: Introductionmentioning

confidence: 99%

The effect of harvesting and flooding on nutrient cycling and retention in Cyperus papyrus wetlands

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Cyperus papryus L. is a fast-growing sedge that can grow to lengths of 5 meter and dominates the vegetation in many wetlands from the Middle East, through eastern and central Africa to the south of that continent. Papyrus wetlands traditionally have provided important ecosystem services to millions of people through provisioning of water, fish, other foods and medicines, and materials for a wide range of uses such as construction, utensils and others. Papyrus wetlands are also important because of their regulating and cultural ecosystem services and their biodiversity. In the landscape they are buffers for water and nutrients, provide habitat for fish, birds and other wildlife, and have been an integral part of the livelihoods and culture of African wetland communities for ages. African wetlands are under pressure from human activities and economic development. As a result, the total area of these ecosystems is declining. With a growing African population and demand for food production, protecting wetlands and combining increased agricultural production with conservation of the ecological integrity of wetlands is urgent. Eutrophication is of growing concern in the region and papyrus wetlands are known to reduce nitrogen (N) and phosphorus (P) loads to downstream water bodies. An increased ability to quantify the role of wetlands in N and P retention and a better understanding of the role of the different processes contributing to N and P retention is needed. To improve understanding of the processes contributing to N and P retention in papyrus wetlands and to evaluate the effects of different management regimes (particularly changes in water regime, and vegetation harvesting), the main objective of this thesis is to develop a dynamic simulation model for nutrient cycling and retention in rooted papyrus wetlands. Chapter 1 of this thesis presents the background on papyrus wetlands in Africa and their ecosystem services, and briefly introduces the thesis chapters and their objectives.

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Growth response of bush tea (Athrixia phylocoides DC.) to climatic conditions in Limpopo Province, South Africa

Tshikhudo

Ntushelo

Kanu

et al. 2019

South African Journal of Botany

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Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

Cited by 3 publications

References 24 publications

The effect of seasonal flooding and livelihood activities on retention of nitrogen and phosphorus in Cyperus papyrus wetlands, the role of aboveground biomass

The effect of seasonal flooding and livelihood activities on retention of nitrogen and phosphorus in Cyperus papyrus wetlands, the role of aboveground biomass

The effect of harvesting and flooding on nutrient cycling and retention in Cyperus papyrus wetlands

Growth response of bush tea (Athrixia phylocoides DC.) to climatic conditions in Limpopo Province, South Africa

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