Characteristics Of Crop Response On Different Salt Tress/Management And The Regulation Of Crop Salt Resistance

Mainly by using pot culture methodology and started with the systematic analysis of crop biological and physiological responses on different types of salt stresses, studies on multiple topics of crop salt resistance and its regulation were carried out in present thesis, including mechanism of crop salt resistance under salt stress, regulation effects of exogenous phosphorus on crops under salt stress, effects of multiple management and regulation factors on crop's ion uptake and transport in shoot under different type of salt stresses, effects of multiple management and regulation factors on crop growth and yield as well as salt resistance, optimal regulation models for improving crop salt resistance and yield performance, and crop yield prediction models under salt stress and with management/ regulation measures. The major results are presented as follows:There exist significant difference on extent of crop response to different types of salt stresses, and in general the extents under Na₂CO₃ and NaCl stresses are greater than that under Na₂SO₄ stress. Response of crop yield to change of soil salt content is more sensible than that of crop biomass. Stability of barley's cell membrane corresponding to salt stress type are Na₂SO₄ >NaCl >Na₂CO₃, from high to low value respectively. Harm level of crop to Na₂CO₃ under lower salt content reached the same level under much higher concentration of NaCl. Along with the increase of NaCl concentration, only Na⁺content in crop stem was significantly increased, and no obvious increase of Na⁺ content in crop leaf was observed. Na⁺was easier to be transported to crop leaf under Na₂CO₃ stress, which can be illustrated by facts that K⁺ content in stem and leaf were significantly lower than that...