农业环境科学学报Issue(8)：1583-1590,8.DOI:10.11654/jaes.2014.08.017
长期咸水滴灌对棉花产量、土壤理化性质和N 2O排放的影响
Effects of Drip Irrigation with Saline Water on Cotton Yield, Soil Physical and Chemical Properties, and Soil N2O Emission
摘要
Abstract
This field study was conducted to investigate the effects of irrigation water salinity and N application rates on cotton yield, soil physical and chemical properties, and soil N2O emission. The experiment included three levels of irrigation water salinity:0.35, 4.61, and 8.14 dS·m-1, referred as fresh water, brackish water, and saline water, respectively. The N application rates were 0 and 360 kg·hm-2(a commonly used rate by local farmers). In the first year of the study, cotton yields were highest in the brackish water treatment, 6.50%high-er than in the fresh water treatment and 22.46%higher than in the saline water treatment. In the subsequent years, cotton yields decreased with increasing irrigation water salinity. As irrigation water salinity increased, soil moisture, soil salinity, and soil NH+4-N concentrations in-creased significantly, but soil pH, organic matter contents, total N concentrations, and NO-3-N concentrations decreased. Irrigation with ei-ther brackish or saline water significantly reduced activities of soil nitrate reductase and nitrite reductase, whereas applying N fertilizer pro-moted their activities. Soil N2O emission was significantly decreased by irrigation with salt-containing water. On the contrary, it was in-creased by N application. Soil N2O emission was correlated positively with soil organic matter, NH+4-N, NO-3-N, nitrate reductase activity, and nitrite reductase activity, but negatively with soil moisture. Soil pH, soil salinity, and total soil N had no significant effects on N2O emis-sions.关键词
咸水/滴灌/氮肥/棉花产量/土壤理化性质/N2O排放通量Key words
saline water/drip irrigation/nitrogen fertilizer/cotton yield/soil physical and chemical properties/N2O emission分类
农业科技引用本文复制引用
张文,周广威,闵伟,马丽娟,侯振安..长期咸水滴灌对棉花产量、土壤理化性质和N 2O排放的影响[J].农业环境科学学报,2014,(8):1583-1590,8.基金项目
国家自然科学基金 （）
