生物覆盖覆盖后土壤水分蒸发量显著减少,能保持土壤水分,防止土壤被冲刷和泛盐,还可以增加土壤有机质含量,阻止杂草生长。具体做法是:在果园里用作物秸秆、杂草、刈割下的绿肥盖5～20厘米的草被,常年覆盖不翻入地下。在草源充足的地方,力争全园覆盖。草源不足的地方,可只覆盖树盘,但厚度—定要达到要求。覆盖后 Bio-coverage of soil moisture evaporation significantly reduced, to maintain soil moisture, to prevent soil erosion and pan-salt, but also can increase soil organic matter content, prevent weeds growth. Specific approach is: in the orchard with crop stalks, weeds, mowing green manure covers 5 to 20 cm of grass, perennial cover does not turn into the ground. Adequate areas in the grass, and strive to cover the whole park. Grassland shortage of places, can only cover the tree plate, but the thickness - will have to meet the requirements. After covering