By O. L. Lange, P. S. Nobel, C. B. Osmond, H. Ziegler

ISBN-10: 3642681565

ISBN-13: 9783642681561

ISBN-10: 3642681581

ISBN-13: 9783642681585

O. L. LANGE, P. S. NOBEL, C. B. OSMOND, and H. ZIEGLER within the final quantity of the sequence 'Physiological Plant Ecology' we've requested individuals to handle the bases of surroundings procedures by way of key plant physiological houses. It has usually been prompt that it's not ecocnomic to aim research of complicated residing platforms by way of the homes of part participants or populations, i. e. , the full is greater than the sum of its elements. however, exams of ecological examine over the past century exhibit that different techniques are seldom extra important. even though it is feasible to explain complicated platforms of dwelling organisms in holistic phrases, the main invaluable descriptions are present in phrases of the delivery, progress and loss of life of individ­ uals. this permits research of functionality of the components of the full contemplating their synergistic and opposed interrelationships and is the foundation for a synthe­ sis which elucidates the categorical houses of a process. therefore it sounds as if the outline of surroundings approaches is unavoidably anchored in physiological lower than­ status. If enquiry into advanced dwelling structures is to stay a systematic workout, it needs to continue tangible hyperlinks with body structure. in fact, as was once emphasised in Vol. 12A, no longer all of our physiological knowing is needed to discover surroundings approaches. For pragmatic reasons, the entire will be adequantely represented as lots lower than the sum of its parts.

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Additional info for Physiological Plant Ecology IV: Ecosystem Processes: Mineral Cycling, Productivity and Man’s Influence

Sample text

E. tRe root system, is uneven in most soils, the common pattern of distribution being concentration of a large proportion of total root biomass in the first 20-30 cm of the profile (SANTANTONIO et al. 1977). here no doubt explain much of this profuse root ramification near the soil surface. Limited root development at greater depth may result from low chemical fertility (SUTTON 1969), poor aeration, high bulk density or, in low rainfall areas, limited depth of water penetration. Not only are roots unevenly distributed in Jhe soil both vertically and horizontally, but their activity varies in time (L YR and HOFFMANN 1967; HOFFMANN 1972), one or more cycles of endogenously controlled activity and quiescence occurring over a growing season.

Horizontal gradients of net mineralization are also evident in rangeland communities characterized by perennial shrubs (CHARLEY and WEST 1977) and in forests dominated by long-lived, large trees (WARD personal communication). Horizontal variation of a different kind is found in some tropical and subtropical communities, where much of the organic matter which would be subject to mineralization in soils of temperate regions is sequestered in termite mounds (LEE and WOOD 1971). Temporal Variability.

Unpublished), the lowest values for both NH4 - Nand N0 3 - N being found in late winter (the driest season) and the highest in late summer (the period of maximum rainfall). Seasonal variation in mineralization potential, as measured by laboratory incubation of intact soil cores, was also evident, tending to be greatest in late winter when the standing crop of mineral N was lowest: this may again reflect the accumulation of available substrates during periods when field conditions for mineralization are least favourable.

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Physiological Plant Ecology IV: Ecosystem Processes: Mineral Cycling, Productivity and Man’s Influence by O. L. Lange, P. S. Nobel, C. B. Osmond, H. Ziegler

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