南方东部丘陵区季节性干旱成因及其对策研究

本文着重从气候和土壤两方面探讨红壤丘陵区土壤季节性干旱的成因。研究结果表明，红壤特殊的水分物理性质和该区特定的大气－土壤－植物系统水分运动模式的综合作用是红壤季节性干旱的主要成因。认为丘陵红壤的土壤水分管理应从土壤结构改良和协调气候－土壤关系两方面入手，通过合理的耕作技术和建立合理的利用方式体系，改良土壤结构，利用深层土壤水分，从而达到提高土壤水分利用率和抗旱、避旱的目的。复合农林业和免耕覆盖技术对红壤水分具有显著的调节作用。

CAUSE OF SEASONAL DRAUGHT FORMATION AND STRATEGY OF THE EASTERN HILLS IN SOUTHERN CHINA

ased on the analysis of water characteristics of red soil in hilly region and of relation-ship among the climate,soil and plant,the present paper reveals that the seasonal draught ofthe soils are due to the special soil water characteristics and the specific patterns of watermovement under the integrated effects of local soil,plant and climate. The results show that. to avoid from or fight against seasonal draught in eastern hilly red soil region of SouthChina,the soil water management should aim at ameliorating red soil structure and improvingrelationship of soil and climate through proper soil management techniques and establishingproper land use systems in order to use deep water in the soil. Besides, agroforestry tech-niques and mulching with minimum tillage have exerted a profound effect on the adjustmentof soil water regime.