NATURAL PROCESSES

Natural Processes

Natural Processes

Introduction

Excessive amounts of salts in the soil to prevent water absorption by the plant, changing the absorption of nutrients and also sometimes has the effect of toxicity of some elements of individual salts in the soil. One problem that occurs many times together with salinity problems is too much water on the floor. If too much water in the soil around the roots, the roots do not have adequate aeration necessary for proper development. This continuously wet soil may result in some serious diseases, stem and roots. A soil too wet is also difficult to work. Cultivating a very wet can destroy soil structure and cause compacted areas and contributes to problems with drainage.

Discussion

There are several definitions of salt and plant halophytes. For example, one criterion is that the plants can grow in saline soil with more than 0.5 percent salt in the soil dry weight. This value should be determined was slightly more important for the plant, but the salt or ion concentration in ground water. The definition also often used by Jennings (1976) called halophytes as the natural flora of saline sites. Already Warming (1909), who defined the concept of halophytes for the first time, wrote that a certain amount of soluble salts must be present before a HALOPHYTIC vegetation occurs, and the nature of the salt seems to be of no importance Mann et al.. (1983) have described the sites as follows: "[...] contain salt water with an osmotic pressure of about 3.3 bar ", which corresponds to a concentration of 70 m M corresponds to monovalent salts.

Plants that do not survive in salt and locations to the exclusion of competition, are often called in German-speaking Glykophyten. This expression is the word "fresh" is derived and is found exclusively in the German language. More appropriate, but less frequently used names for the same concept are halophobe plants or simply non-halophytes.

Salt-tolerant organisms are generally considered halophilic called, and, if authorized by the evolutionarily related salt are no longer capable of resistance to co-exist in the absence of salt. This salt resistance has evolved independently several times. Therefore, no salt plants monophyletic lineage, although in some plant genera and - families may be concentrated.

Among the higher plants are halophytes found only among the angiosperms. There are about 1,500 known halophytes species . families with many members of the Chenopodiaceae , Aizoaceae , Frankeniaceae , Plumbaginaceae and ...