甘肃省河东地区玉米种植适宜性评价和区划
Suitability evaluation and regionalization of maize planting in Hedong Area of Gansu Province

利用1951—2015年甘肃省河东地区17个典型测站气候资料，采用均值法并运用Origin8.0软件对其近65年来年平均气温、4—9月份玉米生育期平均降水量、≥10℃积温总量和年平均霜期日数的空间分布特征进行了分析，结合温度、霜期日数和生育期降水数据对不同测站玉米种植适宜性予以评价。通过对影响研究区玉米种植适宜性主要气候因子分析，并借助GIS空间分析技术得出河东地区玉米种植适宜性区划等级结果。结果表明：(1) 研究区玉米种植适宜性等级总体表征为东高西低。(2) 最适宜区范围最小，密集分布在平凉市和庆阳市南部区域，为正宁县、宁县、泾川县、灵台县、崇信县和庆阳市区。(3) 适宜区主要分布在陇东黄土高原大部、陇南秦巴山区（两当县除外）以及临夏回族自治州大部分地区。(4) 次适宜区集中分布在陇中黄土高原，另有零星分布如环县、两当县、和政县和康乐县。(5) 不适宜区主要分布在甘南高原。
Based on data from 17 typical weather stations from 1951 to 2015 in Hedong area of Gansu Province, spatial distribution characteristics of average temperature in the past 65 years, average precipitation of growth period of maize in 4~9 month, total amount of ≥10℃ accumulated temperature and the annual average number of frost free days were analyzed by using mean value method via Origin8.0 software.The suitability of maize planting in different stations was evaluated according to the temperature, the number of frost free days and precipitation data during growth period. Combining the analysis of the main climatic factors affecting the suitability of maize planting in the study area with GIS spatial analysis technology,maize planting suitability regionalization in Hedong area were obtained .The results showed following: (1) The overall characterization of the suitability of maize planting in the study area decreased from East to West. (2) The most suitable area was the smallest and densely distributed in the southern region of Pingliang city and Qingyang city, including Zhengning County, Ningxian County, Jingchuan County, Lingtai County, Chongxin County and Qingyang city. (3) The suitable areas were mainly distributed in the large part of Longdong Loess Plateau, Qin Ba mountain area in Longnan (except Liangdang County) and most of Linxia Hui Autonomous Prefecture. (4) The sub suitable areas were concentrated in the Loess Plateau of Longzhong, and sporadic distribution such as Huan County, Liangdang County, Hezheng County and Kangle County. (5) The unsuitable area was mainly distributed in the Gannan Plateau.