膜下滴灌和地下滴灌棉田土壤NH_4^+-N空间分布特征研究

Research on the Spatial Distribution Characteristic of NH_4^+-N in Cotton Field Soil under-Membrane Drip Irrigation and Subsurface Drip Irrigation

以田间试验为基础,从时间、垂直和水平空间分布的角度对膜下滴灌、地下滴灌棉田土壤铵态氮含量进行了分析。结果表明,两种不同节水灌溉方式下,棉田土壤铵态氮含量随生育期的变化特征、垂直分布特征和水平分布特征均有异同点。0~5 cm土层铵态氮含量最高,35~55 cm含量普遍较低。水平方向土壤铵态氮随滴灌水扩散,分布在离滴灌带40 cm左右。

Based on field experiment, the content of NH4^＋ - N in cotton field soil of drip irrigation under membrane and subsurface drip irrigation is analyzed from the angles of time, level and vertical spatial distribution in this paper. The result showed that, under two different ways of water - saving irrigation, the content of NH4^＋ - N in cotton field soil differs along with the characteristics of the change in duration period, the vertical spatial distribution and horizontal distribution. The content of NH4^ ＋ - N in 0 - 5 cm soil layer is the highest but lower in 35 - 55 cm layer. NH4 ^ ＋ - N in soil in horizontal direction spreads along with the direction of drip irrigation water,which is mainly distributed away from about 40 cm of drip irrigation zone.