Titlebook: Soil~Plant Relationships; An Ecological Approa David W. Jeffrey Book 1987 David W. Jeffrey 1987 atmosphere.biology.ecology.ecosystem.forest

Aspiration

mand an appreciation of soil-plant relationships. These include desertification leading to famine, soil degradation accom­ panying forest destruction, acidification of watersheds and the spasmodic dispersal of radionuclides and other pollutants. It is public policy, not merely to identify problems, but to see978-0-7099-1464-8978-94-011-6076-6

发源

Vegetation and fire this topic in terms of the biological effects and their evolutionary significance (see Kozlowski and Ahlgren 1974; Wein and McLean 1983). However, there are a number of important effects on the soil-plant system operating at a nutritional level that merit discussion here.

HATCH

Book 1987gist it meant explaining some plant community distribu­ tion patterns by correlation with soil type or conditions. This dual view has been greatly expanded at an academic level by the discovery of the ecosystem as a practical working unit. A flood of concepts and information subsequently emerged fro

憎恶

Plants and waterr of succulents conserved. This system is known to operate not only in the Crassulaceae, but also in succulent members of the Cactaceae, Aizoaceae, Asclepiadaceae, Bromeliaceae, Orchidaceae and Liliaceae.

GROWL

Plants, roots and ion absorptionof organisms most closely associated with them and to their environment. Plants are located in an environmental complex of energy, atmosphere and soil. Within an ecosystem context, plants have three principal functions:

Genistein

Mineral composition of plant tissues and the function of ionsostic tool in agriculture, and many of the drawbacks of the approach are well understood. Ecologists should be aware of the factors leading to variation in the elemental composition of tissues, which can be dealt with under three headings: technical, biological and environmental. Some topics will be

nurture

Plants and waterxchange of water and carbon dioxide at the wetted mesophyll cell wall and the exchange control exerted by stomatal behaviour. Metabolic economy of water use is also well studied, with the C—4 metabolic pathway for photosynthesis now being interpreted as a familar feature of tropical and arid-zone sp

lethargy

Symbiotic and other associations for nutrient capturel cases. The basic unit of study must be conceived of as being a pair or cluster of organisms. A commonplace example is of a nodulated legume with a vesicular-arbuscular mycorrhiza. This adds a new dimension to plant physiology, agriculture and ecology. Without even considering the joint metabolic p

思考而得

Herbivores, decomposers and other soil organismsen considering the movement of ions in the soil-plant system, however, there are features in common which are usefully discussed together. They may be linked by a simple food web as shown in Figure 5.1

Daily-Value

Vegetation and fireto increase the frequency of burning of, for example, European bogs, the boreal forest and Australian heaths (Gill 1975). Man has also extended his range into ecological situations not subject to natural fires, e.g. by shifting cultivation in humid tropical forests. There are clearly many aspects to