Leaf fall and reproductive phenology of Avicennia marina assessed during 1982-83 using litter fall collections from twenty-five sites in Australia, Papua New Guinea and New Zealand revealed major trends with latitude. Flowering shifted from NovemberDecember in northern tropical sites, to May-June in southern temperate sites. Periods between flowering and fruiting increased from two to three months in tropical sites to ten months in southernmost sites. Leaf fall was more variable with unimodal annual peaks in temperate sites and often multimodal patterns in the tropics.

A proper inventory of atmospheric emissions from natural sources is basic to our understanding of the atmospheric cycle of the trace metals (and metalloids), and is also needed for assessing the extent of regional and global pollution by toxic metals1. It is generally presumed that the principal natural sources of trace metals in the atmosphere are wind-borne soil particles, volcanoes, seasalt spray and wild forest fires2–6.

The study of climate and climate change is hindered by a lack of information on the effect of clouds on the radiation balance of the earth, referred to as the cloud-radiative forcing. Quantitative estimates of the global distributions of cloud-radiative forcing have been obtained from the spaceborne Earth Radiation Budget Experiment (ERBE) launched in
1984.

The article offers information on the quantification of organochlorine pesticides residues in edible oils and oil seeds used in India. It states that different organochlorine pesticides were found in the edible oils and oil seeds which include metabolites, aldrin, and endusulfan. It says that sesame oils were found to have low saponification value (SV) but higher free fatty acid (FFA).

The groundwater circulation is limited in Sri Lanka because nine tenth area of the island is underlain by metamorphic hard rocks which are generally very impermeable. Therefore to satisfy the water demand some other possibilities of water resources should be explored before starting a groundwater investigation programme for a given area.

Pest and pest management by vegetable growers were evaluated by interviewing and close monitoring of randomly selected 204 farmers over a period of one and half years.  Two villages selected namely Kolabissa and Marassana located about 45 km from Peradeniya, practiced intensive mixed cropping of vegetables,  Study showd that 95.6% of the farmers were literate.  Many of the farmer

On the basis of hydrochemical and biological studies, a trophic gradient has been established between the inshore and the offshore areas of the Dal lake. The inshore areas receive large quantities of raw sewage and agricultural runoff as a result of which high nutrient concentration of water and the presence of dense phytoplankton populations have been registered at these sites.

The four recent major earthquakes of the Himalayan Convergence Zone, viz., the Kangra earthquake of 1905, the Bihar-Nepal earthquake of 1934, and the two Assam earthquakes of 1897 and 1950 were assigned magnitudes greater than 8 by Richter. Although estimates of areas vary, it is agreed that an extended rupture with its long dimension parallel to the local strike of the Himalaya was involved in each case.

Calculated loading rates of trace metals into the three environmental compartments demonstrate that human activities now have major impacts on the global and regional cycles of most of the trace elements. There is significant contamination of freshwater resources and an accelerating accumulation of toxic metals in the human food chain.

An integrated approach to energy planning, when applied to large hydroelectric projects, requires that the energy-opportunity cost of the land submerged under the reservoir be incorporated into the planning methodology.

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