论文部分内容阅读
在干旱内陆盆地生态水文学研究中,地下水的生态价值日益受到重视。论文以敦煌盆地为研究区,综合潜水埋深和水文地球化学调查、天然植物样方调查以及高空间分辨率遥感技术,从地下水属性变化对天然植物生长的影响以及依赖于地下水的植被生态系统制图等两个方面,开展了依赖地下水的植被生态系统研究。结果表明,以地下水潜水埋深和矿化度为代表的地下水属性与天然植被组成的系统是复杂的非线性系统,由多个相互作用的属性构成;当该系统远离平衡态时,控制系统状态的是多种地下水属性的组合,属性组合的微小涨落可能导致系统状态的较大差异;该系统状态的变化不具有等比例变化特征。植被覆盖度随潜水埋深和矿化度变化具有随机性、确定性和混沌特征。综合考虑研究区植物对地下水的依赖程度、植物对地下水的利用方式、地下水的排泄方式,以及植物群落空间分布格局,结合野外调查数据,完成了研究区依赖地下水的植被生态系统制图。结果表明,研究区除部分河、湖沿岸的植被生态系统外,其余2270.5km~2面积都高度依赖地下水,占总面积的88%。
In the study of ecohydrology in arid inland basins, the ecological value of groundwater is paid more and more attention. Taking Dunhuang Basin as the research area, the integrated diving depth and hydrogeochemical survey, the investigation of natural plant quadrats and the high spatial resolution remote sensing technology, the paper studies the influence of groundwater attributes on the growth of natural plants and the vegetation ecosystem dependent on groundwater And other two aspects, carried out relying on groundwater vegetation ecosystem research. The results show that the system composed of groundwater attributes and natural vegetation represented by the depth and salinity of groundwater diversion is a complex nonlinear system composed of several interacting attributes. When the system is away from the equilibrium state, the state of the control system Is a combination of a variety of groundwater attributes, and minor fluctuations in attribute combinations can lead to large differences in system states; the change in state of the system does not have equal proportionality. Vegetation coverage with the diversion depth and salinity has randomness, certainty and chaos characteristics. Considering the degree of plant dependence on groundwater, the utilization of groundwater by plants, the excretion of groundwater and the spatial distribution pattern of plant communities, the mapping of vegetation ecosystems that rely on groundwater in the study area was completed. The results showed that all the 2270.5km ~ 2 areas except the part of rivers and lakeshore vegetation ecosystems were highly dependent on groundwater, accounting for 88% of the total area.