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橡胶间种砂仁、咖啡对林地枯落物、腐殖质和土壤性质的影响调查结果表明，作物的间种明显提高了林地枯落物的积累量，橡胶＋砂仁、橡胶＋咖啡、纯橡胶林分别为３６５３．５、２８６１．１、１９３４．３ｋｇ／ｈｍ２；土壤有机质含量随之提高，０～５ｃｍ土层有机质含量分别为４４．３０３、３２．９０５、２６．８４０ｇ／ｋｇ；三种胶园种植模式土壤腐殖质组成均以富里酸为主，间种砂仁、咖啡利于胡敏酸和胡敏素的形成；土壤性状因间种而得到改良，２～５ｍｍ最为良好稳定的多孔性团粒结构含量分别为３０．８９％、１３．６６％和１２．１３％。以橡胶间种砂仁对土壤肥力的提高最为理想。
The results showed that the intercropping of crops significantly increased the accumulation of forest litter, and the contents of rubber + amomum, rubber + coffee, pure rubber forest Respectively 3653.5,2861.1,1934.3kg / hm2; soil organic matter content increased, organic matter content of 0 ~ 5cm soil layer were 44.303,32.905,26.840g / kg; three rubber plantation The soil humus compositions were mainly fulvic acid and interspecific amomum and coffee were beneficial to the formation of humic acid and humin. The soil properties were improved by intercropping. The contents of porous aggregates with the best stability of 2 ~ 5mm were 30.89%, 13.66% and 12.13% respectively. Rubber sand to grow the most ideal soil fertility.