Article
Environmental Sciences
Tetsuro Kikuchi, Toshihiko Anzai, Takao Ouchi, Ken Okamoto, Yoshifumi Terajima
Summary: Excessive loadings of nitrogen and phosphorus, combined with imbalances in silicon, have a detrimental effect on water quality and ecosystems in receiving waters. This study conducted periodic water quality monitoring in rivers and streams on Ishigaki Island, Japan, to identify the factors influencing the concentrations of dissolved inorganic nitrogen (DIN), total phosphorus (TP), and dissolved silicon (DSi), with a focus on catchment characteristics. Using a machine learning algorithm called Random Forest (RF), predictive models were developed to estimate nutrient concentrations based on catchment properties. The results showed that agricultural land use significantly influenced DIN and TP concentrations, while broadleaf forests were the most important factor for DSi. Additionally, the study estimated the contributions of DIN from sugarcane fields and livestock barns to riverine DIN, which accounted for up to 60% of the total in the studied river basins. The findings also indicated that DIN from sugarcane fields is more likely to leach into groundwater and rivers in catchments dominated by calcareous geology. These results and methodology have implications for water quality assessment and management in both inland and coastal waters.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Shengmin Zhang, Pieter De Frenne, Dries Landuyt, Kris Verheyen
Summary: Throughfall deposition is an important pathway that transfers particles, aerosols and gases from the atmosphere to the forest floor, and it can significantly impact forest biodiversity and functioning. This study investigates the effects of tree species identity and diversity on throughfall deposition. The results show that both tree species identity and diversity have significant effects on throughfall deposition, with different tree species and increased species diversity leading to varied ion deposition in the forest floor.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biotechnology & Applied Microbiology
Martina Ciardi, Cintia Gomez-Serrano, Maria del Mar Morales-Amaral, Gabriel Acien, Tomas Lafarga, Jose Maria Fernandez-Sevilla
Summary: The study demonstrates that pig slurry can be used as an effective nutrient source for biomass production of Scenedesmus almeriensis, with a biomass productivity rate comparable to standard growth medium. Different dilutions of pig slurry did not significantly affect microalgal growth, while ozonation was effective in reducing the chemical oxygen demand concentration of the media.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Green & Sustainable Science & Technology
Martina Ciardi, Cintia Gomez-Serrano, Tomas Lafarga, Alicia Gonzalez-Cespedes, Gabriel Acien, Jose Gabriel Lopez-Segura, Jose Maria Fernandez-Seviila
Summary: This study assessed the potential of plastic covers to prevent or minimize water evaporation in open photobioreactors. The results showed that although covering the reactors reduced biomass productivity, it also significantly reduced water evaporation in different seasons. The use of inexpensive commercial plastics as covers can greatly decrease the water requirements of the system.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Ecology
Raphael Manu, Marife D. Corre, Alfred Aleeje, Majaliwa J. G. Mwanjalolo, Fred Babweteera, Edzo Veldkamp, Oliver van Straaten
Summary: In a humid tropical forest in Uganda, the response of tree stem growth to nutrient additions varied based on tree sizes, species, and leaf habits. Nitrogen additions primarily increased growth in medium-sized trees and Lasiodiscus mildbraedii species. Potassium limitation was evident in semi-deciduous trees, while the role of phosphorus in promoting tree growth was not pronounced.
Article
Forestry
Miaoping Xu, Junnan Jian, Jiayi Wang, Zhenjiao Zhang, Gaihe Yang, Xinhui Han, Chengjie Ren
Summary: The study found that in Robinia pseudoacacia plantations at different stages of forest succession, root nitrogen and phosphorus resorption efficiencies initially decrease and then increase, while rhizosphere soil nutrient contents increase with stand age. Meanwhile, the diversity of rhizosphere soil microorganisms initially increases and then declines, with different microbial communities having advantages in different nutrient-rich restoration stages.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Environmental Sciences
Suhui Ma, Biao Zhu, Guoping Chen, Xiaofeng Ni, Luhong Zhou, Haojie Su, Qiong Cai, Xiao Chen, Jiangling Zhu, Chengjun Ji, Yide Li, Jingyun Fang
Summary: Land-use change has significant impacts on soil organic carbon storage and microbial residue C accumulation in the tropics. Secondary forest has higher SOC than primary forest, but no difference in microbial residue C concentration, suggesting slow microbial-derived C accrual during secondary succession. Prunus salicina plantation and tea plantation have lower SOC than secondary forest, with lower fungal and total residue C concentrations in the tea plantation, indicating microbial-derived C loss following forest conversion. Litter standing crop affects microbial residue C concentration by regulating fungal biomass and hydrolytic enzyme activities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Geshere Abdisa Gurmesa, Jiangming Mo, Per Gundersen, Qinggong Mao, Yunting Fang, Feifei Zhu, Xiankai Lu
Summary: The study found that a human-disturbed pine plantation in southern China retained about 58% of deposited nitrogen compared to an adjacent old-growth forest which retained 72%. The difference in retention was attributed to previous disturbance, mainly understory and litter harvesting in the pine plantation. The results suggest that plantation forests experiencing human-disturbance and chronic nitrogen deposition have lower nitrogen retention compared to old-growth forests, which may lead to risks of hydrological nitrogen losses, soil acidification, and freshwater pollution.
Article
Biodiversity Conservation
Nolan J. T. Pearce, Isabelle Lavoie, Kathryn E. Thomas, Patricia A. Chambers, Adam G. Yates
Summary: This study investigated how stream communities respond to cumulative human impacts such as nutrient enrichment, showing that the effects of nutrient enrichment are conditional on upstream ecosystem conditions. Future assessments may need to consider the complexities related to environmental stressors when evaluating the impacts of human activities on stream ecosystems.
ECOLOGICAL INDICATORS
(2021)
Article
Ecology
Victor J. Jaramillo, Angelina Martinez-Yrizar, Luis Ignacio Machado
Summary: High-intensity hurricane disturbances have severe consequences on forest structure and functioning, leading to extensive canopy removal and elevated input of fine litter and woody debris. The concentrations and fluxes of nutrients in litterfall were significantly affected by hurricanes, with higher nutrient concentrations and fluxes observed following Hurricane Patricia. These findings suggest that forest biogeochemical resilience can change in the short term due to hurricane disturbances.
Article
Environmental Sciences
Abdullah Darzi-Naftchali, Ali Mokhtassi-Bidgoli
Summary: The research shows that subsurface drainage systems can increase rice grain yield and the efficiency of nitrogen, phosphorus, and potassium utilization, improving the aeration of rice production systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Agronomy
Ryota Aoyagi, Kanehiro Kitayama, Benjamin L. Turner
Summary: This article discusses how tropical tree species maintain high growth rates on low-phosphorus soils and proposes traits and mechanisms related to phosphorus uptake and use efficiency. Despite the prevalence of low-phosphorus soils in the tropics, research on phosphorus use efficiency and acquisition mechanisms in tropical trees is limited.
Article
Forestry
Ari Lauren, Marjo Palviainen, Susan Page, Chris Evans, Inaki Urzainki, Hannu Hokka
Summary: Responsible management of Acacia plantations requires understanding the trade-offs between maintaining stand production and reducing environmental impacts. Intensive drainage leads to increased carbon emissions, peat subsidence, fire risk, and nutrient export, while also enhancing nutrient availability for plant uptake. Dynamic process models can help comprehend the interconnected hydrology, stand growth, carbon and nutrient balance, and peat subsidence, informing production schemes that are environmentally and economically viable.
Article
Soil Science
Petr Capek, Michal Choma, Karolina Tahovska, Jiri Kana, Jiri Kopacek, Hana Santruckova
Summary: Our study found that the capability of microbial community to reduce its demand for external nutrients is responsible for the difference between the predictions and observations. The active part of microbial community instantly recycled N from decaying part of microbial community and very likely utilized internal P sources (i.e. polyphosphates). The results suggest that N recycling from dead microbial biomass and the internal microbial P sources warrant further investigation.
Article
Agronomy
Ana Maria Garcia-Lopez, Antonio Delgado, Ofelia Anjos, Carmo Horta
Summary: This study aimed to assess the fertilizing effects of digestate on soil properties. The results showed that digestate not only contains essential nutrients for crops but also can alter the biogeochemical cycle of nutrients and soil functionality. However, at high doses, digestate application negatively affected soil enzyme activities, microbial biomass, and soil P and C cycling capacity.
Article
Agriculture, Multidisciplinary
Masahiro Inagaki, Koichi Kamo, Tsuyoshi Yamada, Jupiri Titin
JARQ-JAPAN AGRICULTURAL RESEARCH QUARTERLY
(2008)
Article
Forestry
Masahiro Inagaki, Yoshiyuki Inagaki, Koichi Kamo, Jupiri Titin
JOURNAL OF FOREST RESEARCH
(2009)
Article
Soil Science
Masahiro Inagaki, Koichi Kamo, Jupiri Titin, Lenim Jamalung, Jaffirin Lapongan, Satoru Miura
NUTRIENT CYCLING IN AGROECOSYSTEMS
(2010)
Article
Agronomy
Masahiro Inagaki, Koichi Kamo, Kazuki Miyamoto, Jupiri Titin, Lenim Jamalung, Jaffirin Lapongan, Satoru Miura
Article
Plant Sciences
Hisao Sakai, Masahiro Inagaki, Kyotaro Noguchi, Tadashi Sakata, Mikhail A. Yatskov, Hiroyuki Tanouchi, Masamichi Takahashi
SOIL SCIENCE AND PLANT NUTRITION
(2010)
Article
Environmental Sciences
Shigehiro Ishizuka, Shoji Hashimoto, Shinji Kaneko, Kenji Tsuruta, Kimihiro Kida, Shuhei Aizawa, Toru Hashimoto, Eriko Ito, Mitsutoshi Umemura, Yoshiki Shinomiya, Tomoaki Morishita, Kyotaro Noguchi, Kenji Ono, Toru Okamoto, Takeo Mizoguchi, Atsushi Torii, Hisao Sakai, Yoshiyuki Inagaki, Koji Shichi, Jumpei Toriyama, Yoshimi Sakai, Masahiro Inagaki, Yasuhito Shirato, Hiroshi Obara, Kazunori Kohyama, Yuusuke Takata, Nobuko Katayanagi, Takashi Kanda, Haruna Inoue, Takashi Kusaba
Summary: This study compared soil carbon stocks between croplands/grasslands and adjacent forestlands in Japan, finding that the ratio of carbon stocks was influenced by tree age and current vegetation. Factors such as mean annual temperature, mean annual precipitation, and former land use did not have an impact on the ratio. Further research is needed to establish a general conclusion on soil carbon stock changes.
