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

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 participants to deal with the bases of environment techniques by way of key plant physiological houses. It has usually been advised that it isn't ecocnomic to try research of complicated dwelling platforms when it comes to the houses of part contributors or populations, i. e. , the full is greater than the sum of its elements. however, tests of ecological examine over the past century exhibit that different ways are seldom extra priceless. even though it is feasible to explain advanced structures of residing organisms in holistic phrases, the main worthwhile descriptions are present in phrases of the beginning, development and loss of life of individ­ uals. this enables research of functionality of the components of the total contemplating their synergistic and opposed interrelationships and is the foundation for a synthe­ sis which elucidates the categorical houses of a approach. hence apparently the outline of environment strategies is necessarily anchored in physiological lower than­ status. If enquiry into advanced dwelling platforms is to stay a systematic workout, it needs to maintain tangible hyperlinks with body structure. after all, as was once emphasised in Vol. 12A, no longer all of our physiological figuring out is needed to discover atmosphere techniques. For pragmatic reasons, the complete might be adequantely represented as much under the sum of its parts.

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

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Implicit in this concept of a mineralization-immobilization cycle is the assumption that plants cannot compete successfully with microorganisms for inorganic nutrients so that only when there is net mineralization can they acquire nutrients. There is a large body of evidence to support this contention for N which is the element in greatest demand by both plants and microorganisms, and for which there is no primary mineral source in the soil. Whether microbial immobilization ever restricts primary production by causing other nutrients to become limiting for plant growth is much more conjectural.

Falls of rain too small to elicit a plant response may result in the build-up of a pool of inorganic nitrogen which is available to be drawn on by plants as soon as more substantial rains occur. Similar temporal patterns of mineralization are found in monsoon climates which experience a marked seasonal pattern of precipitation, as shown by GREENLAND (1958) for soil from tropical high forest in Ghana. Less pronounced temporal variation in the mineralization of soil N occurs in more equable climates.

Within the surface litter, studies of fungal succession (KENDRICK and BURGES 1962) clearly show vertical patterning of the micro flora, the genera which dominate the L-Iayer on the forest floor in a scots pine stand being quite distinct from those of the F i-layer, and these in turn differing from the dominant fungi of the F 2-layer. Spatial heterogeneity in the distribution of soil and litter fauna is also well documented. For the larger invertebrates, non-random horizontal variation may be related to the presence of suitable cover (WALLWORK 1970).

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