Tanjungpura University

About: Tanjungpura University is a education organization based out in Pontianak, Indonesia. It is known for research contribution in the topics: Peat & Population. The organization has 1405 authors who have published 1321 publications receiving 5539 citations. The organization is also known as: Universitas Tanjungpura Pontianak & Universitas Tanjungpura.

Subsidence and carbon loss in drained tropical peatlands

Abstract: . Conversion of tropical peatlands to agriculture leads to a release of carbon from previously stable, long-term storage, resulting in land subsidence that can be a surrogate measure of CO2 emissions to the atmosphere. We present an analysis of recent large-scale subsidence monitoring studies in Acacia and oil palm plantations on peatland in SE Asia, and compare the findings with previous studies. Subsidence in the first 5 yr after drainage was found to be 142 cm, of which 75 cm occurred in the first year. After 5 yr, the subsidence rate in both plantation types, at average water table depths of 0.7 m, remained constant at around 5 cm yr−1. The results confirm that primary consolidation contributed substantially to total subsidence only in the first year after drainage, that secondary consolidation was negligible, and that the amount of compaction was also much reduced within 5 yr. Over 5 yr after drainage, 75 % of cumulative subsidence was caused by peat oxidation, and after 18 yr this was 92 %. The average rate of carbon loss over the first 5 yr was 178 t CO2eq ha−1 yr−1, which reduced to 73 t CO2eq ha−1 yr−1 over subsequent years, potentially resulting in an average loss of 100 t CO2eq ha−1 yr−1 over 25 yr. Part of the observed range in subsidence and carbon loss values is explained by differences in water table depth, but vegetation cover and other factors such as addition of fertilizers also influence peat oxidation. A relationship with groundwater table depth shows that subsidence and carbon loss are still considerable even at the highest water levels theoretically possible in plantations. This implies that improved plantation water management will reduce these impacts by 20 % at most, relative to current conditions, and that high rates of carbon loss and land subsidence are inevitable consequences of conversion of forested tropical peatlands to other land uses.

Corporate social responsibility disclosure and its relation on institutional ownership: Evidence from public listed companies in Malaysia

Abstract: Purpose – The aim of this paper is to explore corporate social responsibility (CSR) disclosure and its relation to institutional ownership (IO) of Malaysian public listed companies (PLCs).Design/methodology/approach – Testing of hypotheses have been conducted by applying multivariate regression techniques utilizing longitudinal data analysis of companies' annual reports. Two well‐established models, the fixed effects model and random effects model are conducted in this paper.Findings – Results which confirmed earlier estimations indicated that there are positive and significant relationships between CSR disclosure (CSRD) and IO. This result suggests that Malaysian PLCs are able to attract and maintain their institutional investors while they engage in social activities.Practical implications – Companies should be encouraged to be involved in CSR activities as one of their strategies in attracting investment as well as to improve their reputation and image.Originality/value – Most studies on CSRD in Malays...