626 research outputs found
Model estimation of ammonia volatilization from a paddy rice field after application of a surface film-forming material
No full textChanges of low molecular weight organic acids, soil organic matter, nitrogen transformation and microbial populations in rhizosphere and bulk soils in a temperate rain forest
No full textSoil erosion rate estimation using the 137Cs technique in red soil region in southern China.
No full textSoil organic matter and soil physicochemical properties associated with forest fires in central Taiwan.
No full textThe effect of adding rice husk ash (RHA) and calcined shell powder (CSP) on the properties of cement mortar
No full textTo enhance sustainability in the construction industry, incorporating rice husk ash (RHA) as a partial cement replacement is widely encouraged. Additionally, bio-shells, rich in CaCO₃, pose environmental challenges when improperly discarded, leading to pollution and negative impacts on surrounding communities. This study integrates the beneficial properties of these two waste materials for use in construction. While the effects of RHA on cementitious materials have been extensively studied, limited research has examined the combined influence of RHA and calcined shell powder (CSP) as a partial cement replacement. To explore their potential, RHA and CSP were blended in varying proportions to produce RHA-CSP cement mortar. Experimental results demonstrated that the R15S10 mix achieved the highest mechanical performance by optimizing the balance between pozzolanic reactivity and the filler effect. As hydration progressed, the pozzolanic reaction intensified under high pH conditions, increasing the C-S-H dehydration peak while reducing the CH decomposition peak. Additionally, the incorporation of CSP and RHA refined the pore structure and decreased overall porosity, enhancing mortar compactness. By utilizing these waste materials to create an optimized mix, this study supports the sustainable application of discarded shells and rice husks in construction
Capacities of soil to buffer acid rain in an alpine forest toposequence of central Taiwan
No full textSorption of Sulfate and Retention of Cations in Forest Soils of Lien-Hua-Chi Watershed in Central Taiwan
No full textIn Taiwan, the average sulfate and nitrate deposited by acid rain as precipitation amount to 50 kg SO4
2 and 15–50 kg NO3
ha1 year1, respectively. The reactions of sulfate and nitrate with forest soils were not fully understood. Thus, we selected two
forest pedons, namely the Dystrochrept and Hapludult of the Lien-Hua-Chi watershed in central Taiwan, to study their sorption
and desorption of sulfate. Soil samples were leached with simulated acid rain solutions of various acidity and sulfate
concentrations to assess their retention of cations and sulfate. The amounts of sorbed-SO4
2 of two pedons extracted with
NaH2PO4 (0.016 M) solutions in the range 0.14–1.09 mmol kg1 soil were higher than that of native water-soluble sulfate (i.e.,
extracted with H2O), in the range 0.15–0.41 mmol kg1 soil. The amounts of native sorbed-SO4
2 of two pedons correlated
significantly with the exchangeable Al (r =0.91). The sorption of sulfate did not fit well the Langmuir equation. The native
sulfate contents of all tested pedons were near the maximum sulfate sorption capacity. The sulfate sorption capacity and the
amount of released Al correlated well with increasing acidity of simulated acid rain added. Introducing solutions of various
acidity and sulfate concentrations into the leaching solution flowing through the soil column resulted in sharp increases in
amount of sulfate and aluminum released in percolates after several pore volumes were replaced. High clay and sesquioxide
contents at soil depths of 30–50 cm (Bw horizon) and 50–80 cm (BC) of pedon 1 retained part of the sulfate added serving as
the sulfate sink. Released K, Mg and Ca showed two periods of higher leaching pattern, having a trend similar to that the
electrical conductivity (EC) pattern. After leaching of simulated acid rain through the soil column, the soil exchangeable cations
were decreased. The tested soils possess an acid-buffering capacity in pedon 1. Pedon 1 is composed of high clay and
sesquioxide contents and possesses greater buffer capacity than that of pedon 2
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
Full text linkThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
Mosses new to Hong Kong (1)
No full textTen moss species - Garkea flexuosa (Griffith) Marg. & Nork., Campylopus laxitextus Lac., Fissidens dubius P. Beauv., Fissidens ceylonensis Dozy & Molk, Fissidens maceratus Mitt., Philonotis thwaitesii Mitt., Isopterygium minutirameum (C. Muell.)Jaeg., Homalia trichomanoides (Hedw.) B.S.G., Pogonatum neesii (C. Muell.) Dozyand Polytrichum formosum Hedw. are reported new to Hong Kong. Among them, five are new to Guangdong Province of China
Effects of Different Forest Thinning Treatments on Soil Net Nitrogen Mineralization and Nitrification in a Cryptomeria japonica Plantation.
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