沙滩薄地沙滩薄地透气性好,养分分解速度快,根系发达,但土壤瘠薄,漏水漏肥,肥水供应不稳定,树势易衰弱。当肥水大量供应时,因根系发达,透气性好,容易引起短期旺长,如6月份以后大量自然降雨引起的秋梢旺长,而且因根量大,水分、养分耗竭快,加上易渗漏,雨季过后水分、养分极乏,常导致秋季叶片早衰。另外冲积土、平原沙滩地下部常存在黏板层和地下水位过高的 Thin beach sand thin air permeability, nutrient decomposition speed, developed root system, but the soil is infertile, leaking leakage fertilizer, fertilizer and water supply instability, easy to weaken the tree. When a large number of fertilizer supply, due to developed root system, good ventilation, easy to cause short-term flourishing, such as after a large number of natural rainfall in June autumn caused by a long prosperous, but also because of the large amount of roots, water, nutrients depletion, coupled with easy to seepage Leakage, moisture after rainy season, extremely nutrient-poor, often leading to early leaf failure in autumn. In addition, alluvial soil, plains beach often exist in the underground layer of sticky layer and groundwater level is too high