Temperature Suitability of Cotton and Its Changes in Henan Province
Qingchun Liu · 资源科学 · 2004
Being an important crop, cotton is sensitive to temperature change. Selecting 46 counties in Henan province and using the temperature suitability model, the article calculates the temperature suitability of cotton, evaluates the temporal and spatial differences and also predicts the temperature suitability of cotton. Firstly, the article analyzes the temperature suitability of cotton at different growth stages. The result shows that temperature change has a great impact on the temperature suitability of seeding stage and boll opening stage, both of which have the low suitability and the high variability. On the contrary, the other three stages have the high suitability and the low variability. This is caused by the temperature differences between the different growth stages; secondly, the article analyzes the average temperature suitability of 46 counties, based on which the article divides Henan province into three regions: the high suitability region, whose value is higher than 0.7; the medium suitability region, whose value ranges from 0.6 to 0.7; the low suitability region, whose value is lower than 0.6; finally, the article analyzes the inter-annual change of temperature suitability at different growth stages and the result shows all the growth stages except for flower stage in the future have the increasing tendency. At the same time it analyzes the temperature suitability change tendency of 46 counties, and finds that these places also have the increasing tendency and there exists difference among them. Similarly the article divides Henan province into three suitability change tendency regions: the high-increase, whose value is higher than 0.015/a and which mainly distributes in the southwest of Henan province; the medium-increase region, whose value ranges from 0.015/a to 0.01/a and mainly distributes in the center, the southeast, the east and the northeast of Henan province; the low-increase region, whose value is lower than 0.01/a and which mainly distributes in the northwest of Henan province according to the values and the suitability change tendency of seeding stage and boll opening stage and the features of terrain of 46 counties.