Abstract:

Based on hourly temperature and precipitation grid data of CMA land data assimilation system (CLDAS), ground meteorological observation data at 119 weather stations of Inner Mongolia and the spatial distribution of irrigated crop fields, the key meteorological factors and climatic division indexes were determined by considering fully planting technology and agricultural climatic characteristics of sunflower following spring wheat harvest in agro-climatic ecological regions of Inner Mongolia. And taking suitable growth days and climate suitability in the whole growth period as zoning indicators, the refined climatic suitability division of sunflower following spring wheat harvest in Inner Mongolia was studied under the operation of ArcGIS. The results show that the heat shortage and drought in growing season mainly restricted the regular growth and yield formation of sunflower following spring wheat harvest in Inner Mongolia, and the whole region was divided into unsuitable zone, more suitable zone, suitable zone and the most suitable zone. The irrigation conditions in Hetao irrigation district, Tumochuan plain and West Liaohe plain were better, which were particularly suitable to the growth of sunflower following spring wheat harvest, so these regions were the most suitable districts of sunflower growing. Due to serious shortage of heat resource in most areas of middle and eastern Inner Mongolia and the deficit of precipitation in the north of mid-western Inner Mongolia after the transplanting, the sunflower following spring wheat harvest was quite immature, so these regions were unsuitable areas of sunflower growing. The climatic suitability division of sunflower following spring wheat harvest based on grid data of CLDAS was consistent with the division distribution based on meteorological data of weather stations in Inner Mongolia, but the details of CLDAS data division were more refined than that of stations data. Hetao irrigation district was the most suitable area of sunflower following spring wheat harvest in Inner Mongolia, which was accord with the current layout of sunflower following spring wheat harvest. Therefore, this division result could provide some references for the rational layout of sunflower following spring wheat harvest in Inner Mongolia under the background of climate change.

Key words: CMA land data assimilation system (CLDAS), sunflower following spring wheat harvest, climatic suitability division, Inner Mongolia

摘要：

基于内蒙古麦后移栽向日葵生育期的分区,利用中国气象局陆面数据同化系统(CLDAS)的降水和气温格点资料以及内蒙古地区119个气象站观测数据,结合灌溉农区空间分布数据,以适宜生长日数和全生育期气候适宜度为区划指标,在ArcGIS环境下开展内蒙古地区麦后移栽向日葵精细化气候适宜性区划研究。结果表明:制约内蒙古麦后移栽向日葵正常生长和产量形成的主要因素是热量不足和干旱,全区可分为生长不适宜区、较适宜区、适宜区和最适宜区,其中河套灌区、土默川、西辽河平原灌溉条件良好,为麦后移栽向日葵生长的最适宜区,而内蒙古中部大部和东部大部地区移栽后热量严重不足,中西部偏北地区降水亏缺严重,麦后移栽向日葵无法完全成熟,为不适宜种植区。基于CLDAS格点资料与气象站观测数据的内蒙古麦后移栽向日葵气候适宜性分布一致性较好,但CLDAS格点数据的区划精细程度优于站点数据。河套灌区是最适宜种植区,与当前麦后移栽向日葵产业布局较为一致,故本文区划结果可为内蒙古地区麦后移栽向日葵生产合理布局提供一定参考。

关键词: CLDAS, 麦后移栽向日葵, 气候适宜性区划, 内蒙古