基于作物水分亏缺指数的关中冬小麦需水关键期干旱特征分析

Analysis on Drought Characteristics in the Key Period of Water Requirement of Guanzhong Winter Wheat based on Crops Water Deficit Index

干旱严重制约陕西省农业经济发展,为降低关中地区冬小麦旱灾风险,基于作物水分亏缺指数,在分析冬小麦需水关键期水分亏缺指数的变化趋势基础上,开展关中地区冬小麦干旱特征分析,结果表明:研究期间,冬小麦需水关键期水分亏缺指数呈上升趋势,且西安、咸阳、宝鸡上升较快;该地区发生轻旱频率较低,各地区至少6年才发生1次;发生中旱频率较高,局部3年就能发生1次;而发生重旱频率最高,渭南、西安2市每2年就会发生1次;但发生特旱频率也较低,大约4年以上局部地区才可能发生。可为相关部门抗旱减灾工作提供科学依据。

The drought seriously restricts the development of agricultural economy in Shaanxi Province. In order to reduce the risk of winter wheat drought in Guanzhong area, the article is based on the crop water deficit index, based on the analysis of the change trend of water deficit index in the critical period of winter wheat water demand, the drought characteristics of winter wheat in Guanzhong area are analyzed. It indicated that during the study period, the water deficit index of winter wheat water demand period increased, and Xi'an, Xianyang and Baoji rose rapidly;the frequency of light drought in this area was low, and each area occurred at least once in 6 years;The frequency is high, and it can occur once in 3 years. The frequency of heavy drought is the highest. The two cities in southern Anhui and Xi'an will occur once every 2 years. However, the frequency of special drought is also low, and the local area is only about 4 years old. May occur. It can provide scientific basis for drought and disaster reduction work of relevant departments.