摘要
针对不当开发利用导致滩涂土壤理化性质恶化的现实状况,以苏北海涂围垦区为研究区域,应用地统计学方法研究了表土层体积质量这一物理性质的空间异质性。结果表明:研究区表层土壤表现出紧实趋势,各植被类型下表土层体积质量均为弱变异强度;表土层体积质量的分布总体表现为各向同性,较好地符合指数模型;受结构性因素与随机性因素共同作用,表土层体积质量表现为中等空间相关性。Moran’sI系数分析表明,表土层体积质量呈较弱的相关关系,随机性因素是引起其空间异质性的关键原因。水稻种植区表土层体积质量要明显高于棉花种植区,其空间分布格局不仅与土地利用方式差异密切相关,土壤质地差异也是较为重要的因素。该研究为海涂围垦区中、低产地及障碍土壤的合理利用与科学管理提供一定的参考依据。
Aiming at the deterioration of soil physico-chemical properties due to the improper exploitation and utilization of soil resources in the coastal region, spatial heterogeneity of soil physical property of surface bulk density was analyzed by using geostatistical method, which was performed in coastal reclamation region of north Jiangsu Province. The results indicated that surface soil showed a compaction trend, and the variation of bulk density under various vegetation types was rather weak. Surface soil bulk density generally exhibited isotropy and exponential model was fitted to its semivariogram. Bulk density exhibited moderate spatial autocorrelation owing to compound impact of structural and stochastic factors. Moran＇s I coefficient analysis proved that bulk density showed weak spatial dependency, and stochastic factors were the crucial reason of the spatial heterogeneity. Bulk density in rice field was significantly higher than that in cotton field, and the spatial distribution of bulk density was related to differences in both land use patterns and soil textures. The research results can serve as a theoretical reference to the rational utilization and scientific management of moderate-and-low-yield farmlands and obstacle soils in coastal region.
出处
《土壤》
CAS
CSCD
北大核心
2009年第4期659-663,共5页
Soils
基金
国家863计划重点项目(2007AA091702
2006AA10A301)
国家科技支撑计划项目(2006BAD05B04)
中国科学院南京土壤研究所创新领域前沿项目(200752010022)
中国科学院知识创新工程重要方向项目(KZCX2-YW-406-3)资助
关键词
苏北
海涂
土壤体积质量
空间异质性
North Jiangsu, Coastal region, Soil bulk density, Spatial heterogeneity
