Effects Of Water Supplied And Salinity On The Germination Of Soil Seed Bank At The Lower Reaches Of Tarim River

Soil seed bank is summation of vigor seed both in soil and its surface, and which has important study value on population countermeasure and species evolution. The study on the structure ,composition and dynamic succession of the aboveground vegetation of soil seed bank will contributes a lot the management of farmland ,meadow, forest and suffers injury the ecosystem, and will be helpful to make right decision.This research used the open country to investigate and to sprout the law to conduct continuously two years experimental study to the Tarim River lower reaches wilderness river bank forest soil seed bank, union theory and so on species multiplicity and biological statistics has carried on the analysis; At the same time, for under inquired about in the soil seed bank the seed in receives the wild water salt to force sprouts the characteristic difference, has designed 6soil moisture contents and 9 salinity gradients seed sprouts the experiment, suffers injury the ecosystem restoration to the TarimRiver downriver and the vegetation reconstruction produces the further explanation. Obtained result as follows:(1) The Tarim River lower reaches soil seed bank density range of variation is 300 ~ 2,012 grains/m2, between three cross sections soil seed bank density existence remarkable difference(F=14.27),P<0.001).(2) The soil seed bank species compose an Yingsu section year fresh herb primarily, Kaerdayi reach according to the cross section by the perennial herb and the bush primarily, Alagan does the cross section by the bush primarily; In the vertical spatial distribution, the surface layer 0 ~ 5cm seed bank accounts for 61%, 6 ~ 10cm accounts for 21%, 11 ~ 30cm accounts for 18%; In the species multiplicity, three cross sections Simpson multiple index range of variation is 0.8 ~ 0.5, the Margalef rich index range ofvariation is 1.2 ~ 0.4, the McIntosh uniformity index range of variation is 0.6 ~ 0.4, presents toward a lower reaches of Tarim river various index slower obvious change.(3) The seed bank sample surface vegetation multiple index hasthe obvious gradient change. Does the Simpson index from the Yingsu to Alagan the range of variation is 0.7 ~ 0.5, Margalef index range of variation is 0.8 ~ 0.5, the McIntosh index range of variation is 0.5 ~ 0.4. Soil seed bank and aboveground vegetation's similar coefficient between 0.144 ~ 0.469.4) The water, the salt force to the plant seed germination has the obvious inhibitory action, not only displays for reduces the seed germination rate and germination the speed, initial postpones the seed to germination the time, but also lengthens the seed to germination the time.(5) The different solutions salinity remarkable influence seed germination and germinates the index; Karelinia caspica Less highest germination percentage appears in the comparison (0mol/L) processes, Halimodedron halodendron Voss the maximum in 0.05mol/L, Glycurrhiza inflata L.and Alhagi sparsifolia Shap. maximum in 0.2mol/L. The different soil moisture content to seed's and so on Halimodedron halodendron Voss., Glycurrhiza inflata L., Alhagi sparsifolia Shap. and Lycium ruthenicum Murr.germination rate and germination index not remarkable difference.