关键词: 粳稻, 粳稻, 淀粉RVA谱特征值, 剪叶, 疏花

Abstract: The paper aims to analyze the regional distribution and trend of main agro-meteorological disasters in facility agriculture under the background of climate change. According to the meteorological data of 7 stations in Dalian from 1971 to 2014, the climatic characteristics and frequency of cold wave, sparse sunlight, gale and snow disaster were calculated by the standards of agro-meteorological disasters, and the changing trend and spatial characteristics of the four meteorological disasters in facility agriculture in the past 44 years were analyzed with linear trend method and Mann-Kendall method. The results showed that frequency of cold wave, sparse sunlight and gale had a remarkable change from 1971 to 2014 in Dalian. Frequency of cold wave and gale had experienced an obvious reducing trend in the past 44 years, the declining trend of cold wave and gale frequency reached a significant level with M-K trend values as -2.33 and -7.11, respectively. There was a significant increasing trend of sparse sunlight in Dalian, the M-K trend value was 4.43. The four meteorological disasters in facility agriculture also had distinct regional variations. The frequency of cold wave of Changhai was 3 times of that of Lvshun in the past 44 years, the frequency of gale had the spatial characteristics as follows: the coastland and the island had more gale than inland; the area near western coastland had more gale than area near eastern coastland. As a result, the reduction of cold waves and gale in Dalian will benefit the planting structure optimization, but the increase of sparse sunlight days is a new challenge to the farmers.