【摘要】 以三江平原毛果苔草(Carex lasiocarpa)湿地和小叶章(Deyeuxia angustifolia)湿地为研究对象,选取土壤全氮(TN)、全磷(TP)、有效氮、有效磷、有机质、pH值和土壤含水量为主要环境控制因子,通过主成分分析(PCA)和逐步多元回归分析,来确定环境因子对物种相对密度和地上生物量的贡献值.结果表明,2个样地中土壤全氮、全磷、有效氮和有效磷的贡献率能达50%左右.毛果苔草湿地中主成分1能够解释88%的物种相对密度和84%的地上生物量;小叶章湿地中主成分1对相对密度和地上生物量的解释量则分别为75%和58%.湿地营养状况决定着植物的生产量;土壤含水量的变化影响着植物对营养物质的吸收和利用.更多还原

【Abstract】 The contribution values of environmental factors of species relative densities and aboveground biomass were determined though selecting soil total nitrogen, total phosphorus, effective nitrogen and phosphorus, organic matter, soil pH value and soil moisture, as main environment control factors, and using Carex lasiocarpa and Deyeuxia angustifolia in Sanjiang Plain as studied objects, and through analysis of principal component analysis (PCA) and analysis of stepwise multiple regressions. Soil TN, TP, effective N and available P contribution rates in both wetlands could reach about 50%. The principle component 1 in Carex lasiocarpa could explain the species relative density of 88% and the aboveground biomass of 84%. The principle component 1 in Deyeuxia angustifolia could explain that the relative density and the aboveground biomass were 75% and 58% respectively. Wetland nutrient condition decided the plant growth amount. The change of moisture content influenced the plant absorption and the utilization of nutrient.更多还原