关键词: 东北三省, 农业气候资源, 气候倾向率, 银杏, 黄酮类化合物, 温度, 土壤水分

Abstract: Based on the 1961〖KG-*2〗-〖KG-*7〗2007 weather data from 72 meteorol
ogical stations in three provinces of Northeast China, the change characteristic
s of agricultural climatic factors including yearly and temperature-defined growing season’s  mean air
 temperature, ≥10 ℃ accumulated temperature, precipitation, reference evapotranspiration, and sunshine hours were analyzed. In 1961〖KG-*2〗-〖KG-*7〗2007, the
 yearly mean air temperature in the three provinces had an increasing trend, wit
h a rate of 038 ℃·10 a-1. The ≥10 ℃ accumulated temperature in temperature-defined growing season also had an increasing trend, and the border of ≥10 ℃ accumulated temperature belt moved northward and eastward. The area of ≥3200 ℃·d accumulated temperature increased by 22×104 km2. The belt of 2800〖KG-*2〗-〖KG-*7〗320
0 ℃·d moved northward about 085° and eastward about 067°, while that o
f 2400〖KG-*2〗-〖KG-*7〗2800 ℃·d moved northward about 11°. The sunshine h
ours decreased significantly, especially in the east part of Songnen Plain, cent
ral and west plains of Jilin Province, and west part of Liaohe River Plain. The ar
ea with sunshine hours > 2800 h decreased from 136×104 km2 to 41×104
 km2, and the zone with sunshine hours 2600〖KG-*2〗-〖KG-*7〗2800 h moved wes
tward about 15°. The average sunshine hour in temperature-defined growing season was 1174 h. Comparing with that in 1961〖KG-*2〗-〖KG-*7〗1980, the region with more sunshine
hours in temperature-defined growing season in 1981〖KG-*2〗-〖KG-*7〗2007 narrowed significan
tly, and the zone with sunshine hours 1200〖KG-*2〗-〖KG-*7〗1400 h moved westwa
rd about 09°. In 1961〖KG-*2〗-〖KG-*7〗2007, both the yearly and the
temperature-defined growing season’s precipitation decreased, and the yearly reference evapotranspiration i
ncreased in Heilongjiang Province and in the eastern mountain areas of Jilin Pro
vince but decreased in the central and west plains of Jilin Province and in Liao
ning Province. Comparing with that in 1961〖KG-*2〗-〖KG-*7〗1980, the zone of r
eference evapotranspiration with the value of ≥900 mm in 1981〖KG-*2〗-〖KG-*7
〗2007 moved westward about 1°, and the reference evapotranspiration in
temperature-defined growing season increased in most regions of Heilongjiang and Jilin Province but decrease
d in a rate of 0〖KG-*2〗-〖KG-*7〗14 mm·10 a-1 in most regions of Liaoni
ng Province.

Key words: three provinces of Northeast China, agricultural climate resources, climatic variation trend, Ginkgo biloba,  flavonoids, temperature, soil moisture.