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地上生物量的空间格局是物种分布格局的重要内容,在小尺度范围内因地形差异导致的环境异质性是这种格局形成和演变的环境基础。在2011年8月野外调查的基础上,借助ArcGIS和S-PLUS软件,利用广义相加模型(GAM)对退化高寒草地狼毒(Stellera chamaejasme)种群的空间分布格局进行了研究,定量分析了狼毒地上生物量空间格局对主要地形因子的响应机制。结果表明:狼毒种群地上生物量受地形因子影响的顺序为坡向>坡度>海拔>平面曲率>剖面曲率;坡向和坡度两种地形因子对狼毒的地上生物量空间格局的贡献率分别为3.75和1.48,其余因子则相对较小;狼毒地上生物量在海拔、平面曲率和剖面曲率梯度上的分布比较均衡,在坡向梯度上呈开口向下的抛物线趋势,在坡度梯度上则呈现开口向上的抛物线趋势。狼毒地上生物量空间异质性及其与地形因子之间的关系,反映了狼毒在地形因子对水热条件重分配影响下的响应机制及生长策略。
The spatial pattern of aboveground biomass is an important part of the distribution pattern of species. The environmental heterogeneity due to topographical differences in the small scale is the environmental basis for the formation and evolution of this pattern. Based on the field investigation in August 2011, the spatial distribution pattern of the population of degraded Stellera chamaejasme population was studied by means of ArcGIS and S-PLUS software using Generalized Additive Model (GAM) Response mechanism of spatial patterns of toxic topsoil to major topographic factors. The results showed that the order of topsoil biomass affected by terrain factors was slope> slope> elevation> plane curvature> section curvature. The contributions of slope topography and slope topography to aboveground biomass spatial distribution of Stellera chamaejasme were While the remaining factors were relatively small. The distribution of aboveground biomass of Stellera chamaejasme was relatively balanced at elevation, plane curvature and profile curvature gradient, parabolic trend of opening downward at slope gradient, Parabolic upward trend appears. The spatial heterogeneity of aboveground biomass and its relationship with terrain factors of Euphorbia pulcherrima reflects the response mechanism and growth strategy of Euphorbia pulcherrima under the influence of terrain factors on the redistribution of water and heat conditions.