黄河三角洲植被分布环境解释及柽柳空间分布点格局分析

首先运用典范对应分析（CCA）方法，对黄河三角洲湿地植物分布与环境因子之间的关系进行了研究，得出影响黄河三角洲湿地植物分布规律的主要因素是水深和盐度的变化。然后运用点格局分析方法（SPPA），研究了黄河三角洲柽柳在不同水深梯度下的空间分布格局。水深小于0 cm时，柽柳在0～6 m尺度内都不同程度地呈现出集群分布，即在不同水深梯度下，柽柳空间分布格局在尺度变换时，呈现不同的规律。说明水深变化对柽柳空间分布格局有着重要影响，是柽柳生态适应性的体现，也是柽柳对水深适宜性响应的结果。 

Relations between the distribution of vegetation and environment in the Yellow River Delta and SPPA for Chinese tamarisk spatial distribution.

Using canonical correspondence analysis (CCA), the authors studied the relationship between wetland vegetation distribution and environment factors in the Yellow River Delta, and found out that the key factors affecting wetland vegetation distribution were water depth and salinity. And then, by using the spatial pattern analysis method—spatial point pattern analysis (SPPA), the authors studied the different changing rules of spatial distribution pattern of Chinese tamarisk—a major shrub community in the Yellow River Delta, in different water depth gradients. When the water table depth was lower than 0 cm, the spatial distribution of Chinese tamarisk showed a cluster distribution pattern at the 0-6 m spatial scale, and it was related with environment conditions. Spatial distribution patterns varied at different water table depth. When the spatial scale changed, the water depth changing affected the spatial distribution of Chinese tamarisk greatly. This demonstrates the ecological suitability of Chinese tamarisk in response to water table depth.