摘要
通过对广西来宾市红壤丘陵蔗地小尺度的土壤养分空间分析研究表明,土壤各养分含量空间变异强度均为中等;有机质、碱解氮的空间相关性强,空间变异主要由结构性因素引起的;而速效磷、速效钾为中等空间相关,空间变异是由结构性因素和随机性因素共同作用引起的。它们的变异函数理论模型不同,有效变程为117.6m～464.0m。土壤有机质和碱解氮含量的空间分布及变化趋势相近,这说明尽管在有人类高强度农业活动下,土壤有机质中的氮释放对土壤有效氮含量的空间分布影响仍占主导地位。然而,速效磷和速效钾含量的空间分布及变化趋势也基本一致,可能与当地农业活动及环境因素有关。各养分相似的空间分布,有利于实现各种养分较为一致的小尺度分区精准管理和农民的节本增收。
A field experiment was conducted at Laibin in the Guangxi Zhuang Autonomous Region. Samples were collected from sixty-eight 50m ～50m plots from a small scale field to study the spatial variability and distribution of soil nutrients in a red, acidic sugarcane field soil in a low hill subtropical region. Results from statistical and geostatistical analysis indicated that the spatial variability of soil organic matter （SOM）, soil available N （SAN）, soil available P （SAP） and soil available K （SAK） was mid-range. The spatial variability of SAN and SOM was mainly caused by structural factors, while that of SAP and SAK was caused by the both structural and random factors. The Semi-Variogram of SOM, SAN, SAP and SAK was well described by the Spherical Model, Spherical Model, Exponential Model and the Spherical Model, respectively. The effective ranges of spatial correlation varied from 117.6 m to 464.0 m. The spatial distribution pattern of SAN was similar to that of SOM showing that the spatial distribution of SAN was still primarily influenced by N released from SOM despite intense agricultural activities. Meanwhile, the spatial distribution patterns of SAP and SAK were similar, showing that their spatial distributions were unlike those of SAN and SOM, likely influenced by both agricultural activities and environmental factors. The general distribution trends of SOM, SAN, SAP and SAK were all alike indicating the area studied was ideal for site-specific management of nutrients and productive farming.
出处
《中国糖料》
2008年第2期21-24,共4页
Sugar Crops of China
基金
广西自然科学基金项目(桂科自0778006-7)
关键词
甘蔗地
土壤养分
小尺度
空间变异
Sugarcane field
Soil nutrients
Small-scale
Spatial variability
