Study On Planting Salt-enduring Plants For Ameliorationg Soil Salinity

In the present paper, the nutrient dynamic changes of soil salinity on planting salt-enduring plants in various period , in Daqing of HeiLongJiang province are studied. Including the dynamic changes of ameliorated soil salinity of physics and chemistry characters , enzyme , nutrition composition , microbe etc. The feasibility and physiological mechanism about planting salt-enduring plants to ameliorated soil salinity are discussed. The changes of soil salinity by fertilizing various additive in the experimental soil are first reported. 1. The influence of salt-tolerant plants on nutrition composition of soils With the time increasing of planting salt-enduring plants organic matter content and total nitrogen and humus content are trend to raised , total phosphorus content are raised a little; total potassium content are changed no clearly , total sodium content , total calcium content and total magnesium are reduced in varying degrees. After planting salt-enduring plants , the intensity of amination and nitrogen fixation are raised, and the intensity of nitrification intensity trend to cut down . The content of Na~ and K~ reduced in various degrees and the 2+ content of Ca are trend to raised. 2.. The influence of salt-enduring plants on physical and chemical characters of soils Negative correlation exist between unit weight of soil and fixed number of year of planting salt-enduring plants . After planting salt-enduring plants , soil getting more loosen, per unit volume of weight and unit weight get to reduce . The component of soil gradually transformed clayey soils into coarse soils, middle granule and fine soils. With the growth of giant fibre system and structure of soils getting more improved and, porosity of soil, permeable stratum and the osmosis of soils getting more increase. Meantime, the rate of salt amassed and returned getting reduced, it is more advantaged to salt drip washing and physical character. It is obviously that the content of water of soils could influence the growth of plant and the physical character of soils. With the planting salt-enduring plants , mucosity of soils getting more reduced and porosity of soils getting more improved. After planting salt-enduring plants, the content of full salt of soils and pH reduced in various degrees; iii 3 .~ The influence of salt-enduring plants on enzyme of soils With fixed number of year of planting salt-enduring plants , cellulolytic enzyme , urease, phosphatase and polyphenoloxidase of soils are increased , transforming enzyme of soils changes no clearly. 4~ The influence of salt-enduring plants on microorganism of soils After planting Puccinellia tennjflora and Suaeda glauca , the numbers of microbe of soils including bacteria, fungi and actinomyces in Aneurolepidium chinese flora are the most, the velocity of breath and biomass are better than other two plant communities. The changes of biology characters of soils are in keeping with positive succession of plant community. 5. The influence of various mode of ameliorating soil salinity on nutrition composition of soils, physical and chemical characters. The best effects are planting salt-enduring plants and fertilizing various additive in soil salinity at the same time.