榆林景观生态完整性的地统计分析  

Geostatistics analysis of landscape ecological integrity in Yulin, China

作　　者：石玉琼 王宁练[1,2] SHI Yuqiong;WANG Ninglian(College of Urban and Environmental Science,Northwest University,Xi’an 710127,China;Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi’an 710127,China;College of Forestry,Shanxi Agricultural University,Jinzhong 030801,China)

机构地区：[1]西北大学城市与环境学院,陕西西安710127 [2]西北大学陕西省地表系统与环境承载力重点实验室,陕西西安710127 [3]山西农业大学林学院,山西晋中030801

出　　处：《西北大学学报（自然科学版）》2023年第1期25-32,共8页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金(42130516)。

摘　　要：景观生态完整性是一种区域化变量,具有异质性,其异质性随时间发生变化,且在不同年份受不同因素的驱动。利用地统计学方法,运用GS+9.0软件对榆林市景观生态完整性(LEI)的各向同性和各向异性变异进行了研究。在各向同性条件下,2000年、2005年、2010年和2015年由随机因素引起的空间异质性分别占总空间异质性的7.30%、45%、43.5%和30.7%,主要表现在10 km范围内。而在这4年中,由空间自相关因子引起的空间异质性分别占92.7%、55%、56.5%和69.3%,主要表现在10 km和54.6 km、153.6 km、181.8 km以及119.4 km之间,榆林这几年空间异质性主要由空间自相关因素引起。LEI的块金值与基台值之比从0.073变化到0.45,反映了LEI具有中度到强度空间相关性。景观生态完整性的空间格局越简单,空间依赖性越强。各向异性条件下,2000年、 2005年、 2010年和2015年以空间结构性变异为主,分别占到总空间变异的71.84%、70.00%、71.85%和85.80%。景观生态完整性的空间格局是景观特征的综合反映,并受随机因素和结构性因素的共同作用,地统计学可以很好地表达景观生态完整性的空间异质性。Landscape ecological integrity is a regionalized variability and has heterogeneity. Its heterogeneity varies over time and is driven by different factors in various years. In this paper, Geostatistical methods were used for isotropic variation and anisotropic variation of landscape ecological integrity(LEI) in Yulin using GS+9.0 software. Under isotropic conditions, the spatial heterogeneity caused by random factors accounted for 7.30%, 45%, 43.5% and 30.7% of the total in 2000, 2005, 2010 and 2015 respectively, mainly within the range of 10km. In these four years, the spatial heterogeneity caused by spatial autocorrelation factors accounted for 92.7%, 55%, 56.5% and 69.3% respectively, mainly between 10 km and 54.6 km, 153.6 km, 181.8 km and 119.4 km. Spatial heterogeneity was generated by spatial autocorrelation factors principally in recent years in Yulin. The ratio of nugget value to base value of LEI varied from 0.073 to 0.45, reflecting a moderate to strong spatial correlation of LEI. The simpler the spatial pattern of landscape ecological integrity, the stronger the spatial dependence. In anisotropic situations, the spatially structured variance dominated in ratio of 71.84%, 70.00%, 71.85% and 85.80% of the total independently in 2000, 2005, 2010 and 2015. The spatial pattern of Landscape ecological integrity is a synthetic expression of landscape characteristics influenced by random factors and structural factors. Geostatistics can be well used to express the spatial heterogeneity of landscape ecological integrity.

关 键 词：景观生态完整性 地统计学 半方差分析 各向同性变异 各向异性变异 

分 类 号：Q149[生物学—生态学]