摘要
对φ(N)32°14′~32°56′,λ(E)104°36′~104°51′范围内400~1400m稻田小气候进行了观测,发现海拔(halt)不同,稻田生态环境相差很大:halt每升高100m,平均气温(θar)递减0.72℃,年降雨量递增63.0mm(400~600m)~106.8mm(800~1400m),相对湿度递增1%,日照时数呈抛物线上升变化.halt400m日均温稳定通过12.0℃的初期为3月中旬,halt每升高100m,该时间延迟5~7d.不同halt>12℃的有效积温分别为3621.2℃(400m)、3245.0℃(600m)、3149.9℃(800m)、2804.8℃(1000m)、2082.1℃(1200m)、1950.1℃(1400m).在相对较高的halt,存在明显的逆温和南北坡效应,相应存在杂交水稻局部高产区.
The ecological circumstances of rice fields are greatly varied at different altitudes. The microclimate in rice fields between 400~1400 m above sea level was observed as follows: As altitude rose per 100 m, mean air temperature decreased by 0.72℃, relative humidity increased progressively by 1% , and annual precipitation increased by 63.0 mm (between 400~600 m) and 106.8mm (800~1400 m), respectively. Sunny hours tended to change in parabola. The middle March was the initial period in which daily mean air temperature rose steadly over 12℃ at 400 m and the period was delayed for about 5~10 d as the altitude rose per 100 m. Effective accumulated temperatures in the fields above 12℃ at different altitudes were 3621.2℃/400 m , 3245.0℃/600 m, 3149.9℃/800 m, 2804.8℃/1000 m, 2082.1℃/1200 m and 1950.1 ℃/1400 m, respectively. Owing to the apparent effects of inversion and south-north facing slopes, rice fields with high yields were found in some regions. This study provides the scientific basis for the layout and cultivation of hybrid rice in various regions at different altitudes in Sichuan.
出处
《应用与环境生物学报》
CAS
CSCD
1999年第2期142-146,共5页
Chinese Journal of Applied and Environmental Biology
基金
国家攀登计划子项目