长白山阔叶红松林表层土壤水分空间异质性的地统计学分析 |
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引用本文: | 王存国,韩士杰,张军辉,王树堂,徐媛.长白山阔叶红松林表层土壤水分空间异质性的地统计学分析[J].应用生态学报,2010,21(4):849-855. |
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作者姓名: | 王存国 韩士杰 张军辉 王树堂 徐媛 |
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作者单位: | 1. 中国科学院沈阳应用生态研究所,沈阳,110016;中国科学院研究生院,北京,100049 2. 中国科学院沈阳应用生态研究所,沈阳,110016 |
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基金项目: | 中国科学院知识创新工程重要方向项目,国家自然科学基金重点项目 |
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摘 要: | 采用时域反射仪对长白山原始阔叶红松林3块50m×50m样地表层土壤(0~7.5cm)水分进行测定,应用地统计学的理论与方法对表层土壤水分的空间异质性进行分析.结果表明:研究区3块样地表层土壤水分变异系数分别为24.32%(样地1)、24.11%(样地2)和23.60%(样地3),均属于中等变异性;该区表层土壤水分的理论变异模型为球状模型,具有高度的空间异质性,其空间异质性以空间自相关部分为主;表层土壤水分的结构比分别为57.9%(样地1,属中等相关性)、83.3%和90.0%(样地2和3,属强烈的空间相关性);研究区表层土壤水分的变程在5.5~13.1m,与贝叶斯方法估计的变程相差不大;通过克立格插值估计,研究区表层土壤水分含量的平均值分别为49.3%(样地1)、52.8%(样地2)和42.6%(样地3).
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关 键 词: | 阔叶红松林 土壤水分 地统计学 空间异质性 |
Spatial heterogeneity of surface soil moisture in a broad-leaved Korean pine forest in Changbai Mountains based on geostatistic analysis |
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Institution: | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China|Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | By the methods of geostatistics, this paper studied the spatial heterogeneity of surface soil moisture in a broad-leaved Korean pine forest in Changbai Mountains. Three sampling plots sized 50 m×50 m were installed, and the moisture content in 0-75 cm soil layer was measured with a time domain reflectometry. The coefficient of variation of the surface soil moisture was 24.32% in plot 1, 24.11% in plot 2, and 23.60% in plot 3, suggesting a moderate variability. The variogram of the surface soil moisture could be well fitted by spherical model, and had a higher spatial heterogeneity, which mainly came from spatial autocorrelation. The structural ratio of surface soil moisture was 57.9% in plot 1, 83.3% in plot 2, and 90% in plot 3, and the regressed range (distance beyond which samples were spatial independent, an indicator of patch size) was 5.5-13.1 m, being consistent with the results from Bayesian method. Through Kriging interpolation, the surface soil moisture content was 49.3% in plot 1, 52.8% in plot 2, and 42.6% in plot 3. |
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