白三叶草间作对亚热带丘陵茶园地温及生产的影响

利用亚热带丘陵区茶园白三叶草间作大田对比试验,研究其对茶园地温时空动态变化的影响。结果表明:茶园地温具有明显的时空变化特征和位相滞后现象,白三叶草间作改变了土壤热量交换层(地表层)的性质,对不同观察时刻、不同深度的土壤温度具有低温时增温、升温时降温、降温时保温及降低日较差、增强同一土层温度稳定性等综合动态调控作用,其调控效果表现出了0cm>5cm>10cm>15cm>20cm、13:00>19:00>7:00、降温>保温>增温、降温幅度随气温的升高而增大、增温和保温随气温的下降而加强的相同趋势,同时还降低了有害高温的出现次数,提高了茶园生态系统的自我调节能力,改善了茶叶品质,增加了茶叶产量。

Effects of Intercropping of Trifolium repens Linn. in Tea Plantation on Soil Temperature and Production in Subtropical Hilly Regions

Dynamic effect of intercropping Trifolium repens Linn. in tea plantation on spatial and temporal variation of soil temperature in the subtropical hilly region was studied. Results showed that soil temperature presented distinct character of spatial and temporal variation and hysteresis. As the intercropping of Trifolium repens had changed the nature of soil thermal exchange layer, e.g. soil surface, the daily soil temperature difference in the different soil layers had been decreased and stabilized when the temperature changed. The Trifolium repens Linn. covering showed a significant effect on surface soil temperature and in the noon time. The effect of Trifolium repens covering on lowing the soil temperature was most significant and on keeping temperature was moderate and on increasing the temperature was minimum. The more soil temperature decreased, the more air temperature increased. However, the effect on lowing and keeping temperature showed the same tendency as the air temperature decreased. The emergence of harmful high temperature in intercropping tea plantation was less than that in general treatment. Therefore, the intercropping of Trifolium repens Linn. in tea plantation could enhance the ability of ecosystem self-adjustment and improve the tea quality and yield.