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干旱是一种常见的自然灾害,严重影响着我国的农业生产。论文分别采用标准化降水指数(SPI)和条件植被指数(VCI)对河南省干旱时空特征进行分析,并探讨了气象干旱和农业干旱的相关性。结果表明:近60 a河南省气象干旱频率呈现出轻微上升的趋势,夏秋两季气象干旱频率较高,农业干旱频率在秋冬两季较高,气象干旱和农业干旱频率在不同季节呈现出不同的空间分布特点。整体上看,农业干旱相对于气象干旱,存在一定程度的滞后:冬季最长,约为2个月,春季较长,约为1个月,而夏季最短,小于1个月;河南省SPI和VCI的相关性具有明显的时空分布特征:冬季和春季相关性较强,夏季次之,秋季最差;平原和盆地区等冬小麦/夏玉米种植区正相关性较强,在非耕地区有所减弱,而在信阳南部等水稻种植区正相关性差。
Drought is a common natural disaster that seriously affects our country’s agricultural production. The paper analyzed the spatial and temporal characteristics of drought in Henan Province by using standardized precipitation index (SPI) and conditional vegetation index (VCI), and discussed the correlation between meteorological drought and agricultural drought. The results showed that the drought frequency of meteorological drought in Henan Province tended to increase slightly in recent 60 years, the meteorological drought frequency was higher in summer and autumn, the frequency of agricultural drought was higher in autumn and winter, and the meteorological drought and agricultural drought frequency showed different in different seasons Spatial distribution characteristics. Overall, there is a certain degree of lag between agricultural drought and meteorological drought: the longest winter is about 2 months, the spring is longer, about 1 month, and the summer is the shortest, less than 1 month. The SPI and The correlation of VCI has the obvious spatial and temporal distribution characteristics: the correlation is strong in winter and spring, followed by summer, the autumn is the worst; the correlation between plain and basin winter wheat / summer maize planting area is strong, and in non-cultivated area Weakened, while in southern Xinyang rice planting areas such as the positive correlation is poor.