Sarkar D.,ICAR Research Complex for NEH Region |
Bungbungcha Meitei C.,ICAR Research Complex for NEH Region |
Baishya L.K.,ICAR Research Complex for NEH Region |
Das A.,ICAR Research Complex for NEH Region |
And 4 more authors.
Catena | Year: 2015
Secondary forest in shifting cultivation might influence soil organic carbon (SOC) stock. However, information with respect to SOC accumulation or depletion in fallow stand with secondary forest in shifting cultivation is insufficient. We, therefore, undertaken this experiment with the objective to evaluate the impact of secondary forest on SOC stock and its allocation into pools of different oxidizability [very labile (CVL), labile (CL), less labile (CLL) and nonlabile C (CNL)] along soil depth using three fallow chronosequences of shifting cultivation located in subtropical mid-hills of northeast India. Results showed that SOC content in 0-0.45m depth increased with age of the fallow stand [the values being 78.4, 91.5 and 102.8 Mg ha-1 in young (5-9years), mid-aged (18-20years) and old (28-33years) secondary forest, respectively] after land clearing (slashing and burning of forest) and exhaustive cropping (75.9 kg ha-1). There was a decrease in SOC content with increasing soil depth, constituting 49.0, 27.8 and 23.2% of the total (for 0-0.45m) for 0-0.15, 0.15-0.30 and 0.30-0.45m, respectively. Among the analyzed C pools CVL, CL and CLL were influenced by the fallow period and the active pools (CVL+CL) constituted 65.7% of the SOC. Most of the SOC pools were significantly correlated with each other and with fallow age. Results thus indicate that soil in shifting fallow conserves increasing amount of organic C during regeneration of forest vegetation and majority of the SOC is in active or labile pools of shorter residence time. © 2015 Elsevier B.V.
Wong N.H.,National University of Singapore |
Tan A.Y.K.,National University of Singapore |
Tan P.Y.,Center for Urban Greenery and Ecology Research |
Sia A.,Center for Urban Greenery and Ecology Research |
Wong N.C.,Research and Development Planning and Administration
Journal of Urban Planning and Development | Year: 2010
The objective is to discover the current perception of vertical greenery systems and barriers to their widespread adoption in Singapore. It can be concluded that the energy saving property of vertical greenery systems make them suitable for the local conditions as Singapore depends heavily on air conditioning. In addition, vertical greenery systems will also enhance the aesthetic of a building. Moreover, the installation of vertical greenery system is part of the effort to reduce the increasing serious air and noise pollution. Lastly, vertical greenery system is able to bring nature closer to humans. As with all greenery, constant clearing of the residue of dead leaves as well as periodical replacement and trimming cannot be avoided. These may become a barrier in convincing building owners to adopt vertical greenery systems. Furthermore, there is a lack of technical information, maintenance instructions, and information on plants suitable for vertical greenery systems locally. Lastly, there is lack of awareness of the benefits and performance of vertical greenery systems as well as a lack of grants and subsidies for implementation of vertical greenery systems. © 2010 ASCE.