Study On Propagation And Ecology Characteristic Of Scirpus Planiculmis In Momoge Wetland

For identify possible causes,the habitat of the plant which Grus leucogeranus depended on has been destroyed yearly.It was found out that the Grus leucogeranus live by the underground corm of the Scirpus planiculmis and some fingerling.As one of the important food of the Grus leucogeranus,the habitat of Scirpus planiculmis has been destroyed seriously . The food and the habitat decreased yearly. The living environment of the Grus leucogeranus are being destroyed.The most key factor of the degradation in Momoge wetland is the dry up of the water resource. Scirpus planiculmi is emblematical hygrophytes,the growth of it closely related to the water resource especially the soil water content. Quantitative analysis between the soil water content of the wetland and the growth of Scirpus planiculmi is the key point during the rejuvenation in Momoge wetland and also is the important methed to protect and exploit wetland biodiversity reasonably, to guarantee the completeness of The structure and functions of wetland and to to realize the region sustainable development.In order to set up the restoration system of the Scirpus planiculmi in Momoge wetland,the relation between the growth of Scirpus planiculmi and soil habit and the propagation characteristic of Scirpus planiculmi has been studied.As the emblematical hygrophytes,the growth of Scirpus planiculmi needs water strictly.The growth of the Scirpus planiculmi is divided into four levels by the height and coverage of Scirpus planiculmi along the soil gradation of moisture. In order to provide the theoretical base on the Scirpus planiculmi restoration technique in Momoge wetland and find out the best value and critical value on soil water conent and soil salinity content which suitable for Scirpus planiculmi,the soil water conent and soil salinity content has been studied .At the same time,the propagation mechanism of Scirpus planiculmi has been studied and shows that Scirpus planiculmi propagated by the underground corm.The main results are described as follows:1.Scirpus planiculmi propagated by the underground corm,and the overwintering corm begin to bourgeon in middle third in April and form the overground part.With the uninterrupted growing of the overground Stem and leaf, the overwintering corm become to form new rhizome and the topmost of the new rhizome form new corm.When is comes to the last third of the month in May,the number of the new rhizome,new corm and reborn rhizome,new reborn corm reach to the peak.2.From the distribution rule of the corm,it distribute in the soil in 0~10cm.When the soil water content and soil salinity content are studied ,the depth of the soil focus on the 0~10cm. 3.For the past few years, for the drought in Momoge wetland,the water resource is limited.How to restore the growth of the Scirpus planiculmi maximality with limited water resource is the key technology in Momoge wetland.4.In the relation between the Scirpus planiculmi and soil habit ,for the soil water content bring down gradually,the soil salinity content increase gradually and the growth of Scirpus planiculmi comes to weak up until disappeared completely and instead by Suaeda glauca and other salt tolerant plants.The soil water content and soil salinity content also reach to the ultimate value at last.5.The relation between the growthof Scirpus planiculmi and the soil water content and soil salinity content:when growth of the Scirpus planiculmi is in its best status,the critical soil water content and soil salinity content are 25%~27% and 0.125%~0.375%;when the soil water content break down to 21%~25% and the soil salinity content reached 0.375%~1%,the Suaeda glauca and othe salt tolerant plants appeared,but Scirpus planiculmi is still in its normal growth ;when the soil water content break down to 20%~21% and the soil salinity content reanched 1%~2.75%, Suaeda glauca appeared abundant and become the most important plant in the plant community instead of the Scirpus planiculml,and the Scirpus planiculml distributed Sporadically and forfeited the function for self-healing.When the soil water content reduced to 14%~17% and the soil sali nity went up to 1.75%~3.125%,the Scirpus planiculml disappeared completely.