为了探讨滨海盐化潮土台田对苹果根系分布的影响,采用改良壕沟法进行了调查。在滨海盐化潮土台田土壤中,12年生八棱海棠砧长富2号苹果根系水平分布距离6．02 m,为冠径的2．43倍。距离树干1、2、3、4 m处,根量分别占观察剖面根量的26．5%、20．4%、22．3%和18．7%,共占87．9%。根垂直分布深1．5 m,为树高的45．2%。根集中分布在5~120 cm土层内。根有分层分布的趋势,第一层分布在5~20 cm土层内,第二层在70~120 cm土层内。直径<0．5、0．5~2．0、2．0~5．0、5．0~10．0和>10．0 mm的根,分别占总根量的64．4%、30．3%、3．6%、1．0%和0．7%。不同粗度的根,水平分布都较远；0~5 cm土层只有直径<2．0 mm的细根,5~120 cm土层中各类根都有,130 cm以下土层中也主要是直径<2．0 mm的细根。在滨海盐化潮土台田中苹果根系的分布呈“综合型”。%In order to discuss the influence of the coastal salinized soil on apple root system distribution in the platform field coastal salinized soil, research be proceeded by the modified oskamp method. In the coastal salinized soil of platform field soil, the roots distribution distance of “Fuji Nagafu No. 2” apple with 12 years old rootstock ( Malus robusta Rehd) was 6. 02 m, and crown diameter was 2. 43 times. The root amount in the distance of 1, 2, 3, 4 m to the trunk accounted for 26. 5%, 20. 4%, 22. 3%, 18. 7% of the total root amount, totally 87. 9%. Vertical distribution of root was 1. 5 m deep, and was 45. 18% of the tree height. Most root was distributed in the 5~120 cm soil layer, and showed a layering distribution. The depth of the first layer was 5 to 20 cm, the second was 70 to 120 cm. The ratios of roots with diameter of <0. 5, 0. 5~2. 0, 2. 0~5. 0, 5. 0~10. 0, >10. 0 mm were 64. 4%, 30. 3%, 3. 6%, 1. 0% and 0. 7% of the total root respectively. The horizontal distribution of distance of different diameters was diferent, in the 0 to 5 cm soil layer there was only roots with diame-ter <2. 0 mm, various types of root could be found from 5 to 20 cm soil layer, under the 130 cm soil layers only roots with di-ameter <2. 0 mm was found. Apple root distribution was comprehensive in the platformcoastal salinized field soil.
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