The farmland ecosystem is of some characteristics in karst area, such as fragmentary sections, strictly restricted by water, very sensitive and frail to external impact, heavy population pressure.

• 喀斯特区农田生态系统具有空间分布上的破碎性、受水分限制明显、对外界影响既敏感又脆弱、人口压力巨大等特征。