Soda Saline-alkaline Soil Tolerance Of Several Species In Seedling Stage

For the difficulty of plant recovery and reconstruction of forestry ecology program in the northern, we studied the field trial of 38 plant germplasm in the soda saline-alkaline soil of different concentration, and selected the better plant germplasm of tolerating soda saline-alkaline soil. Through studying the gas exchange parameters, chlorophyll fluorescence parameters, photosynthesis pigments and so on about 9 plant species in soda saline-alkaline soil of different concentration, evaluating the abilities of plant tolerating soda saline-alkaline soil, selecting the effective indexes of every plant species tolerating soda saline-alkaline. Through X-ray microanalysis, determining the content of Na+,K+ in the root,stem,leaves of Ulmus sibiraca, discussing the mechanism of tolerating soda saline-alkaline soil. The results as follows:1. Field trial showed that 1 age seedlings of Nitraria sp.were unsuitable to live in the soda saline-alkaline soil of lower concentration. The families of Ulmus pumila:57,72,212,216,8033; and Elaeagnus moorcroftii,Fraxinus chinensis,Pyrus betulaefolia, Tamarix gansuensis,T. austromongolica,T. ramosissima,N. sibirica (tongyu provenance),N. roborowskii were suitable to live in soda saline-akaline soil of median concentration. Russia-6 (N. schoberi),T. ausromongolica,T. gansuensis,T. romosissima,N. sibiraca(tongyu Provenance),N. roborowskii were suitable to live in the soda saline-alkaline soil of high concentration.2. Biomass and height growth of N. sibirica were stimulated by soda saline-alkaline soil of moderate concentration. The growth can be restrained by lower and soda saline-alkaline soil of higher concentration; the limit of stoma was the main reason of decreasing of the photosynthesis of N. sibirica.3. X-ray microanalysis showed that N. sibirica can tolerated the external soda saline-alkaline soil by attracting amount of Na+; under 0.4% soda saline-alkaline soil concentration, Na+,K+ concentration in the exodermises cell of root was significantly higher than cortical cell and stelar parenchyma(P<0.01), maybe the reason was that N. sibirica have the mechanism of tolerating soda saline-alkaline soil.4. Comprehensive analysis of different indexes of 8 plant species showed that the abilities of different plant species to tolerate soda saline-alkaline are different, the effective of indexes to evaluate it was different, so we should build the effective comprehensive evaluating systems according to different plant species.