摘要
橡胶与砂仁间作和纯橡胶林两种林分营养元素净积累、归还及营养元素在植物、土壤之间生物循环的研究结果表明：间种砂仁可明显增加林分植物库中营养元素的含量，间作林中营养元素总积存量达３４４７．０７ｋｇ／ｈｍ２，是纯胶林的２．５３倍；营养元素总归还量每年每公顷为３６３．２６ｋｇ，是纯胶林的１．４４倍，其中Ｎ，Ｐ，Ｋ，Ｃａ，Ｍｇ的年归还量分别是纯胶林的１．９，２．５４，１．４２，１．０５，１．１６倍；间作林中的Ｎ的归还量为最大，纯胶林中以Ｃａ的归还量为最大，两种林分均以Ｐ的归还量为最小。间作林中营养元素的年吸收总量为１０８３．４３ｋｇ／ｈｍ２，是纯胶林的２．１倍。尽管营养元素的循环系数低于纯胶林，但吸收系数却高于纯胶林，可见间种有利于植物对土壤库中营养元素的吸收。
In rubber( Hevea brasiliensis )plantation intercropped with Amomum longiligulare (RA) and pure rubber plantation(PP) of 30 year old,biomass and nutrient elements(N、P、K、Ca、Mg)of each component of tree,intercrops and litters were detected.Net accumulation and biological cycle of nutrient elements of two plantations have been comparatively studied.The results showed that annual accumulative and uptake amount of 5 nutrient elements of RA was 3 447.07 and 1 083.43 kg/hm 2,2.53 and 2.1 times of PP respectively.Annual return amount of RA was 363.26 kg/hm 2,among which N、P、K、Ca、Mg was 1.9, 2.54, 1.42,1.05,1.16 times of PP respectively.With the comparison of 5 nutrient elements,the return amount of N was more in RA system,and P less for two plantations.Although the cycle coefficient of RA was lower than that of PP,the absorption coefficient was higher than that of PP,that means intercropping can improve rubber tree and A.longiligulare to uptake soil nutrients.
出处
《林业科学研究》
CSCD
北大核心
1997年第5期464-471,共8页
Forest Research
基金
加拿大IDRC资助
关键词
橡胶树
砂仁
复合经营
营养元素循环
rubber tree Amomum longiligulare intercropping nutrient elements biological cycle
