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调亏灌溉下菘蓝耗水量变化特征
王玉才, 张恒嘉, 邓浩亮, 李福强, 黄彩霞, 薛道信
甘肃农业大学 水利水电工程学院, 甘肃 兰州 730070
摘要:
[目的]研究膜下滴灌调亏灌溉对河西地区菘蓝耗水量和产量的影响,为干旱、半干旱区菘蓝的高产种植提供理论依据。[方法]通过大田试验分析耗水量和产量变化。[结果]在营养生长期和肉质根生长期各处理的耗水量呈现出随着水分亏缺程度的加剧逐渐降低,与CK相比显著降低(4.11%~15.71%,p<0.05)。耗水强度变化规律基本呈现出苗期最小(约0.90 mm/d),肉质根成熟期较大(约1.60 mm/d),营养生长期和肉质根生长期最大(约3.00 mm/d)。WD4(营养生长期和肉质根生长期轻度亏水)处理的菘蓝产量与CK无显著(p>0.05)差异,达到8 235.32 kg/hm2,WD1(营养生长期轻度亏水)处理的水分利用效率最高[23.62 kg/(hm2·mm)],WD4处理次之,且比CK提高6.74%,即WD4处理为最优处理。[结论]轻度水分亏缺可以有效降低菘蓝各生育期的耗水量,提高菘蓝产量和水分利用效率。而重度水分亏缺则导致土壤水分显著降低,不利于菘蓝生长。
关键词:  调亏灌溉  耗水量  土壤水分  菘蓝
DOI:10.13961/j.cnki.stbctb.2019.02.027
分类号:S274.1
基金项目:甘肃省重点研发计划项目“荒漠绿洲膜下滴灌调亏特色经济作物水生产力研究”(18YF1NA073);国家自然科学基金项目(51669001);甘肃农业大学盛彤笙科技创新基金项目(GSAU-STS-1744);甘肃农业大学水利水电工程学院青年教师科技创新项目(SLSDXY-QN2018-02)
Characteristics of Isatis Tinctoria Water Consumption in Regulated Deficit Irrigation
Wang Yucai, Zhang Hengjia, Deng Haoliang, Li Fuqiang, Huang Caixia, Xue Daoxin
College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Abstract:
[Objective] The water consumption and yield in the drip regulated deficit irrigation were studied by field experiment in order to provide a theoretical basis for the high yield planting of Isatis tinctoria in arid and semi-arid areas.[Methods] Water consumption and yield changes were analyzed by field trials.[Results] The water consumption in the vegetative growth period was gradually reduced with the increase of water deficit. Compared with the one of CK, water consumptions of regulated deficit irrigation reduced significantly by 4.11%~15.71%(p < 0.05). In an overall, the water consumption intensity basically showed its minimum in the seedling stage(about 0.90 mm/d). In the fleshy root maturity stage, it was larger(about 1.60 mm/d); and in the vegetative growth and fleshy root growth period, it got the largest(about 3.00 mm/d). There was no significant difference between the ones of WD4(mild water deficit during growth and fleshy root growth) treatment and CK(p > 0.05). The yield of Isatis tinctoria reached 8 235.32 kg/hm2. Treatment of WD1(mild water deficit during vegetative growth) had the highest water use efficiency 23.62 kg/(hm2·mm), the one of WD4 was 6.74% and its was higher than the one of CK. Comparatively, WD4 was the best treatment.[Conclusion] Moderate water deficit had no significant yield difference with the one of CK, hence it can effectively reduce the water consumption of each growth period and correspondingly improve the water use efficiency. However, severe water deficit leads to a significant decrease in soil moisture, which is not conducive to the growth of Isatis tinctoria.
Key words:  regulated deficit irrigation  water consumption  soil moisture  Isatis tinctoria