茶园土壤速效磷乡镇尺度下空间异质性对比分析——以江浙地区优质名茶种植区为例

土壤中磷素的含量对土壤肥力和茶叶品质起着至关重要的作用,探讨土壤磷素含量的空间分布特征及其影响因素,可以为茶园管理和茶叶品质的提升提供理论指导。以江苏省东山镇和浙江省溪龙乡两个优质名茶种植区为例,在遥感影像和DEM数据的基础上,应用地统计学方法,对比研究了两个茶园土壤速效磷含量的空间异质性特征。结果表明:(1)按土壤肥力等级标准,东山镇和溪龙乡速效磷含量的平均水平均较高,利于茶叶生长;(2)东山镇和溪龙乡速效磷含量的变异系数分别为0.46和0.52,均属于中等强度变异;(3)空间插值结果显示,东山镇和溪龙乡速效磷在空间上都具有相连成片的特征,但东山镇速效磷呈阶梯状分布特征,而溪龙乡速效磷则呈辐射状分布特征;(4)东山镇和溪龙乡速效磷的块基比值分别为0.343和0.142,表明溪龙乡速效磷受随机性因素的影响较东山镇的小,而受结构性因素的影响较东山镇的大。

COMPARATIVE ANALYSIS OF SPATIAL HETEROGENEITY OF SOIL AVAILABLE PHOSPHORUS AT THE TOWNSHIP SCALE——TAKING THE HIGH～ QUALITY TEA PLANTING AREA IN JIANGSU AND ZHEJIANG AS EXAMPLES

The content of phosphorus in soil is important to soil fertility and tea quality. Exploring the spatial distribution characteristics of soil phosphorus and its influencing factors can provide theoretical guidance for tea garden management and tea quality improvement. Taking the typical tea gardens in Jiangsu and Zhejiang Provinces as the study areas, in this paper we studied comparatively the characteristics of spatial heterogeneity of soil available phosphorus using GIS techniques with geostatistics methods, remote sensing and DEM data. The results showed that:(1) According to the soil fertility grade standard, the overall levels of available phosphorus in Dongshan and Xi Long were both high and conducive to the growth of tea. (2) The coefficients of variation of soil available phosphorus in Dongshan and Xilong were 0.46 and 0.52, both of which belonged to moderate intensity variation. (3) The spatial interpolation results showed that the spatial distribution of soil available phosphorus in Dongshan and Xilong had such characteristic, those places where the content of soil available phosphorus were the same can be connected together. (4) The coefficients of nugget of available phosphorus in Dongshan and XiLong were 0.343 and 0.142, which proved that compared with Dongshan, the spatial distribution of soil available phosphorus in Xilong was influenced less by random factors, such as tea garden road and management, while was influenced larger by the natural factors such as the soil properties, landform and topography.