四川盆中丘陵坡地保土抗旱措施探讨

Study on the Tillage Pattern of Preserving Soil and Drought-resistant in the Dry-farmland in the Central Hill of Sichuan Basin

1997～ 1999年在四川省中江县旱坡耕地实施“目”字型种植法具有较好的保土抗旱效益 ,结果表明 :“目”字型种植有蓄水抗旱、增加土温和水土保持效益 ,“目”字型种植土壤蓄水 (0cm～ 40cm)较常规平作多 2 0 5 5m3 /hm2 ,各生育期平均延长抗旱天数 3 3d ,增加土温 0 2 5℃～ 0 94℃ ,且“目”字型种植可使坡土减少地表径流 78%和泥土流失量80 %。“目”字型种植是四川贫中丘陵区旱坡耕地较好的保土抗旱措施。

The tillage pattern of '目(mu)' had the very good profits in preserving soil and drought resistant in slope dry farmland of Zhongjiang county,Sichuan province from 1997 to 1999.The results have indicated that planting pattern of '目(mu)' had the effects of retaining water and drought resistant, enhancing soil temperature and soil and water conservation and so on.The soil retaining water of the planting pattern of '目(mu)'(0cm～40cm) was more 20.55m 3/hm 3 than that of general planting and prolonging drought resistant 3.3 day in the different bearing period of maize and increasing soil temperature 0.25℃～0.94℃.Moreover, the planting pattem of '目(mu)' also had significant profit of soil and water clonservation and decreased 77.6% of runoff and 80.1% of soil loss. It was better the measure of preserving soil and drought resistant in the dry farmland in the central hill of Sichuan basin.