包气带为地表附近的植物根系提供水分。
Above the water table is the vadose zone, through which rainwater percolates.地下水位的上方是包气带,雨水从中渗透。
Water in the vadose zone drains down to the water table, leaving behind a thin coating of water on mineral grains.包气带中的水会沉降到地下水位,只在矿物颗粒表面留下一层薄薄的水膜。