以临泽县4种生境（沙丘生境、盐渍生境、盐渍-沙丘过渡生境、沼泽生境）芦苇根茎和芦苇根际土壤为研究对象,测定不同生境下芦苇根茎生长发育指标、根际土壤微生物数量及水分、盐分含量,分析了不同生境下根茎生长发育与根际土壤微生物数量、土壤含水量及含盐量的关系。结果表明：（1） 对比4种生境下芦苇根茎发育,从盐渍生境,到盐渍-沙丘过渡生境、沙丘生境,再到沼泽生境,根茎节间距呈缩短趋势,而节直径、根茎长度及不定芽数呈增长趋势,根茎含水量和根茎生物量、株高、基径也呈增加趋势。（2） 根际土壤微生物数量在4种生境之间差异显著,盐渍生境下芦苇根际土壤真菌数量最多,细菌、放线菌数量最少;沼泽生境芦苇根际土壤真菌数量最少,细菌、放线菌数量最多。（3） 相关性分析表明,芦苇根际土壤微生物数量对芦苇根茎数量特征的驱动作用不同。土壤细菌、放线菌数量、B/F值是芦苇根茎长度、根茎节直径、根茎生物量、根茎含水量、株高、基径的主要影响因子,土壤真菌是芦苇根茎节间距的主要影响因子。土壤细菌、真菌、放线菌、B/F是芦苇根茎不定芽数的主要影响因子。土壤细菌、放线菌、B/F值为正向驱动,真菌为负向驱动。

Comparative study on the reed rhizospheric microenvironment and reed rhizome growth and development in four different habitats were reported in this paper. The rhizome and reed rhizospheric soil in four habitats (sand dune habitat, transitional habitat from saline to sand dune, saline habitat, marsh habitat) were studied in Linze County. Relevant indicators, such as the growth and development indexes of the reed rhizome, quantity of microorganisms, soil water, and soil salt content, were determined in the rhizospheric soil of different habitats. Based on the analysis, the relationship between the growth and development of the rhizome and the quantity of microorganisms, water content, and salt content in rhizospheric soil in different habitats was elucidated. The results showed that: (1) There were significant differences in the biomass of the reed rhizome among the four habitats, among which the internodal length was largest in the four habitats. The pitch diameter, biomass, water content, and length of the rhizome as well as the number of adventitious buds were smallest under the salt habitat, which showed that the growth of the reed rhizome was inhibited by saline soil. Compared with the development of the rhizome in four habitats, from salt habitat to salt-dune transition habitat to sand dune habitat, and then to marsh habitat, which were manifested as a shortening trend of internodal length, thickening trend of pitch diameter, and increasing trend of rhizome length, adventitious bud number, rhizome water content, and rhizome biomass. (2) There were significant differences in the number of rhizospheric soil microorganisms among the four habitats; the highest salt content of reed rhizospheric soil, largest number of soil fungi, and smallest number of bacteria and actinomycetes were found in the salt habitat. The smallest number of fungi and the largest number of bacteria and actinomycetes existed in the marsh habitat. (3) A correlation analysis showed that the number of soil microorganisms in the reed rhizosphere had different driving effects on the number characteristics of reed rhizomes. The number of soil bacteria, actinomycetes, and B/F value are the main influencing factors of the reed rhizome length, rhizome node diameter, rhizome biomass, rhizome water content, plant height, and base diameter. Soil fungi are the main influencing factors of reed rhizome node spacing. Soil bacteria, fungi, actinomycetes, and B/F were the main factors affecting the number of adventitious buds. Soil bacteria, actinomycetes, and B/F value were positive driving factors, whereas fungi were negative driving factors. The oil water content has the greatest direct effect on the number of soil bacteria in the rhizosphere, and the soil salt content has a negative direct effect on the number of soil bacteria. Soil salinity has an indirect effect on soil bacteria through the soil water content. Soil salinity has the greatest direct effect on soil fungi, and soil water content has a greater indirect effect on soil fungi through soil salinity. It has a negative direct effect on soil actinomycetes, and the soil salt content has a greater indirect effect on soil actinomycetes through the soil water content.