保护地不同灌溉方法表层土壤pH小尺度的空间变异

基于保护地定位灌溉试验,采用经典统计学和地统计学的方法,以网格取样方式采集不同灌溉方法(沟灌、滴灌、渗灌)表层土壤,研究微尺度下土壤pH值的空间变异特征及空间分布。结果表明:经6年灌溉,沟灌处理pH显著降低,沟灌和滴灌0～5cm土层土壤pH表现为中等空间自相关,而其5～10cm和渗灌0～5cm和5~10cm的土壤pH表现为弱空间相关,水分的供给方式和数量影响土壤pH的空间变异。

Micro-scale spatial variability of surface soil pH under different irrigation methods in greenhouse

Based on 6-years irrigation experiment in greenhouse, micro-scale spatial variability and the distribution of surface soil pH were analyzed by combining classical statistic method with geostatistic method with a small grid-sampling technique under three irrigation methods (furrow irrigation, drip irrigation and subsurface irrigation). The results indicated that, after 6-years irrigation, soil pH under furrow irrigation decreased significantly, soil pH (0 ~ 5 cm) under furrow irrigation and drip irrigation were medium heterogeneity, and soil pH (5 ~ 10 cm) of furrow irrigation and drip irrigation, soil pH (0 ~ 5, 5 ~ 10 cm) of subsurface irrigation which were weak heterogeneity. The supplying way and quantity of water by irrigation can affect the spatial variability of soil pH.