Study On The Rhizosphere Enzymes Of Halophytes In Ebinur Lake Wetland

Ebinur Lake Wetland was highly saline and alkaline.Vegetation was scarce. Evaporation was strong.Ecosystems were fragile.Soil nitrogen content was low. Available phosphorus content was very low.Nitrogen and phosphorus was necessary for plant growth.Available phosphorus was the most important limiting factor affecting plant growth in saline-alkali soil. This study was to sort out the halophytes in Ebinur Lake Wetland through field investigation and literature.By comparing the rhizosphere soil physical and chemical properties and soil enzyme activities of main halophytes, it can provide basis for choosing halophytes species in restoring Ebinur Lake Wetland.There were 31 families,73 genus and 144 species of halophytes in Ebinur Lake Wetland.16 of 17 plant communities were evidently halophytic. Geological elements were 4 types and 4 subtypes at the family level;9 types and 7 subtypes of genus, which can be thought to have very consanguineous relation with ancient Mediterranea. There was no endemism in this area. Life forms showed that 12 of 16 constructive species of communities were woody plants.In general,at the family level Chenopodiaceae halophytes in Ebinur Lake Wetland has the greatest proportion. Mediterranean ingredients was obvious from the perspective of geological elements. Shrubs had absolute advantages.I selected 25 plottings of rhizosphere involving nine communities or 17 halophytes, as compared with 5 plottings of non-rhizosphere.In addition,7 plottings of psammophytes and three plottings of farmland were included.A total of 120 soil samples has been collected.I analyzed soil pH,conductivity,total salt,TDS,organic matter and catalase associating with salt,urease associating with nitroge,phosphatase associating with phosphorus.Most of the correlations between indicators were good. Five kinds of rhizosphere enzymes at three levels of all plant species has been ranked.The rankings were not the same.Simple sortings can not represent the potential capacity of halophytes in transfering nutrients.In general,enzymes were distributed as follows: the 1st level>the 2nd level>the 3rd level, most of which significantly or very significantly.Drop from 1st level to the 2nd level was smaller than that of the 2nd level to the 3rd level.Salt distributed much higher at the 1st level.The more salt,the higher enzyme activities.Rhizosphere soil pH,conductivity,total salt and TDS was lower while organic matter and enzyme activities was higher than that of non-rhizosphere soil.Most differed significantly.Halophytes can renew saline and alkaline soil.Halophytes rhizosphere soil has significantly higher soil enzyme activities and organic matter accumulation.It's easier to renew vegetation in saline-alkali soil than in sand.Overgrazing can turn saline-alkali soil into sand.Organic matter content was not significantly different before and after reclaiming, reflecting the high fertility of saline-alkali soil.Leguminous plants were significantly more powerful than non-leguminous plants in reducing soil salinity.Leguminous plants have the advantage of fixing nitrogen. Urease levels of its rhizosphere soil were higher than that of non-leguminous plants, and significantly higher in the lower and middle classes;Leguminous plants can reduce soil pH.Acid phosphatase activities were higher than non-legumes while alkaline phosphatase activities were less than non-legumes.Choosing leguminous plants to reclamate saline-alkali soil was better.