不同品系橡胶人工林养分循环比较研究

Comparative study on the nutrient cycling in different strains of rubber plantation

对RRIM600和热研7-33-97橡胶人工林生态系统养分积累、生物循环以及土壤养分平衡状况进行研究。结果表明:(1)热研7-33-97橡胶人工林总养分积累量与养分归还量都低于RRIM600,而养分吸收量、存留量以及胶乳中养分流失量却高于RRIM600;(2)两品系橡胶人工林各营养元素积累量大小顺序为K>P>N,橡胶林各养分元素循环量(吸收、存留、归还及胶乳流失)大小顺序为N>K>P,并且热研7-33-97比RRIM600养分消耗更多,养分流通量更大;(3)随着林龄的增长,两个品系橡胶人工林养分循环流通量都逐年增加,而橡胶林土壤中养分失衡状况也在逐渐加剧。

The nutrient accumulation, biological cycle and soil nutrient balance of RRIM600 and RY7-33-97 rubber plantation ecosystem were studied. Results showed that the nutrient accumulation and return quantity in RY7-33-97rubber plantation were lower than thase in RRIM600, while, the nutrient absorption, retention and loss amount of rubber latex in RY7-33-97 were higher than those in RRIM600. The accumulation and circulation（absorption, retention, return and latex loss） of nutrient elements in rubber plantation ecosystem for two strains could be respectively ranked in the following order： KPN and NKP, in addition, RY7-33-97 had more nutrient consumption and greater circulation than RRIM600. These results indicate that the flux of nutrient cycling both in RRIM600 and RY7-33-97 rubber plantation ecosystem are gradually increasing with the increase of age, while the imbalance of nutrient in soil becomes more serious.