[1]GUO Junwen,SHAN Hongtao,GUO Junrui.Characteristics of Spatiotemporal Distribution and Variation of Frost in Semiarid Regions of the Loess Plateau in Central Gansu[J].Research of Soil and Water Conservation,2020,27(03):101-105.
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Characteristics of Spatiotemporal Distribution and Variation of Frost in Semiarid Regions of the Loess Plateau in Central Gansu
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
101-105
Column:
目次
Public date:
2020-04-20
- Title:
- Characteristics of Spatiotemporal Distribution and Variation of Frost in Semiarid Regions of the Loess Plateau in Central Gansu
- Keywords:
- earliest frost day; latest frost day; frost-free period; spatiotemporal distribution and variation; Longzhong of the Loess Plateau
- CLC:
- P429
- DOI:
- -
- Abstract:
- The spatiotemporal change and abnormal distribution characteristics of the earliest day and the latest day of frost as well as the frost-free period were studied by a climatic statistical method based on the daily lowest ground temperatures in semiarid regions of the Loess Plateau in Central Gansu during the period 1971—2016. The results show that the earliest frost day are August 25, the latest frost day is June 28, and the mean frost-free period is 125～149 days in the research area; in recent 46 years, the earliest frost day has been postponed by 3.1 days per daceade, and the frost-free period has been significantly prolonged by 3.9 days per decade. The prolongation of frost-free period increased the heat in the crop growth season and was benefitial to crop growing, and thus the planting areas suitable for thermophilic crops and winter crops were expanded from low altitude to high altitude. The areas of winter wheat and maize expanded; the areas of spring wheat and the areas not suitable for planting crops shrank; and the multiple cropping indexes were significantly improved. However, the instable variation of frost has amplified the risk of low temperature and frost-induced damage.
- References:
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Last Update:
2020-04-30