Biological improvement of saline and alkaline land mainly combines crop production and livestock raising in a proper manner to improve land fertility and then raise economic benefits of saline and alkaline land.
Nowadays,ion beam implantation technique has been applied to many research fields of theory and application,such as organism improvement,life origin and evolution,radiobiological effect of the environment.
Ion beam implantation technique has been applied to many research fields, such as organism improvement, life origin and evolution, and radiobiological effect of the environment, since the mutagenic effects of ion beam had been discovered at the mid of 1980′s.
The contents of SO42-and Ca2+ ions in surface soil of the whole section salinized soil increased under irrigation quota 3 600 m3/hm2 than 6 000 m3/hm2.It is not suitable to change original soil into irrigated one in initial stage of irrigation region development.
The result was produced by the study of bioreclamation saline soil for long period in 3 -5m ground water table and silt loam soil. The result displayed: It was the best mode of desalination to plant salt-tolerant wheat and Meliatus officnlis in saline/alkaline ground and the soil salinity reduced to 0.282% from 1.989% at 0-100cm soil layer in one year. The desalination ratio was 85.82%.
From the author's point of view,there are four feasible measures to improve the situation of salinization in Heihe River irrigated area,namely agricultural techniques,water conservancy project,biogeographical improvement and chemical improvement.
Biotic reclamation of the saline and alkaline land means the direct planting of the salt- enduring plant in salinization land, in conventional irrigation, not to require any subsidiary condition and facilities,in which the soil salinity is retained beyond the root system zone in soil profile.
The kinetics of the decomposition are consistent with possible biological mediation.
The end result of biological mediation was to increase the proportion of each element present in a less toxic form, thus affecting the potential toxicity to a natural ecosystem.
This observation and other data are used to postulate a scheme for the biological mediation of iodine distribution in the lake.
This study highlights the biological mediation of internal loading in shallow eutrophic lakes, and in particular, the role of sediment algae in decreasing, and sediment bacteria in enhancing, sediment P release.
The extent of these changes is shown to be related to the physico-chemical conditions in the sediments and hence the extent of biological mediation.