Ecology of deepwater rice-fields in Bangladesh 1. Physical and chemical environment

The Earth has the greatest abundance and variety of sedimentary strata in our star system, dating back some 3.8 billion years. ‘Sedimentary rocks’ describes the processes that create different types of sedimentary rocks, which form a key guideline in reconstructing Earth’s history. Particles are created by both physical and chemical weathering. These particles are then moved by different modes of transport and sorted by size, which affect the resulting sedimentary rock. Sedimentary layers can remain as soft muds or loose sands for millions of years, but most buried sedimentary layers harden and turn into rock, under the combined effects of increasing heat and pressure, and of changes in chemical environment.

Download Full-text

Ecology of deepwater rice-fields in Bangladesh 2. Chemistry of sites at Manikganj and Sonargaon

Hydrobiologia ◽

10.1007/bf00007930 ◽

1988 ◽

Vol 169 (1) ◽

pp. 23-30 ◽

Cited By ~ 10

Author(s):

B. A. Whitton ◽

J. A. Rother ◽

Ashit R. Paul

Keyword(s):

Rice Fields ◽

Deepwater Rice

Download Full-text

The Physical and Chemical Environment

Ecological Studies - The Ecology of a Salt Marsh ◽

10.1007/978-1-4612-5893-3_2 ◽

1981 ◽

pp. 21-36 ◽

Cited By ~ 4

Author(s):

L. R. Pomeroy ◽

J. Imberger

Keyword(s):

Chemical Environment ◽

Physical And Chemical

Download Full-text

Physical and chemical environment ofKhawrMugsayl, a coastal lagoon in southern Oman

Journal of Arid Environments ◽

10.1006/jare.1996.0232 ◽

1997 ◽

Vol 36 (1) ◽

pp. 1-14 ◽

Cited By ~ 5

Author(s):

Reginald Victor ◽

Jayanthi R Victor ◽

Nicholas V Clarke

Keyword(s):

Coastal Lagoon ◽

Chemical Environment ◽

Physical And Chemical

Download Full-text

ENVIRONMENTAL CHARACTERIZATION OF FLOODWATER IN EASTERN INDIA: RELEVANCE TO SUBMERGENCE TOLERANCE OF LOWLAND RICE

Experimental Agriculture ◽

10.1017/s0014479799002057 ◽

1999 ◽

Vol 35 (2) ◽

pp. 141-152 ◽

Cited By ~ 29

Author(s):

P. C. RAM ◽

A. K. SINGH ◽

B. B. SINGH ◽

V. K. SINGH ◽

H. P. SINGH ◽

...

Keyword(s):

Rice Fields ◽

Lowland Rice ◽

Submergence Tolerance ◽

Eastern India ◽

Deepwater Rice ◽

Field Surveys ◽

Saturated Water ◽

Rainfed Lowland ◽

Water Profile

Floodwater was characterized through field surveys over three years in rainfed lowland and deepwater rice areas of Eastern India. Measurements focused on dissolved O2 and CO2, pH and irradiance during flash floods in rice fields. Over locations and time, dissolved O2 concentrations ranged from zero to 0.28 mol m−3 (0–1.1 times air-saturated water at 30 °C) while dissolved CO2 ranged from 0.28 to 1.96 mol m−3 (31–217 times air-saturated water). Floodwater pH varied from 6.6 to 9.7. Irradiance decreased with depth in the water profile to an extent depending on turbidity. Turbidity varied greatly over locations and time. The significance of these measurements in assessing rice submergence tolerance is discussed.

Download Full-text