刺激割制下橡胶园养分状况及其与产量的关系

于2003年8～9月在西双版纳胶园采集土壤样品218份,橡胶树叶片样本107份,调查了刺激割胶制度实施5 a后的胶园养分状况及其与胶树产量的关系.结果表明：刺激割制实行5 a后西双版纳胶园除土壤有机质、全氮、叶片氮含量下降外,总体来说其他养分状况均有所改善.胶园养分状况的好转与刺激割制推行过程中各农场采用营养诊断施肥等措施有关.缺氮是西双版纳垦区胶园的普遍现象,已成为该区胶树产量提高的限制因子,建议增施氮肥;但也有个别农场缺磷（东风农场）、缺镁（景洪农场）的现象.胶树产量与叶片N含量、胶园0～20 cm土壤有机质、全氮、有效氮、有效磷含量成正相关,与叶片K,Ca,Mg,P含量呈负相关.

Nutrient Conditions of Rubber Plantations and Their Relationship with Latex Yield under Stimulated Tapping System in Xishuangbanna

An attempt was made to study the soil and leaf nutrient status and their relation to latex yield. There were 218 soil samples and 107 leaf samples collected for analysis in August to September, 2003 from the rubber plantations in Xishuangbanna, Yunnan Province, China. The results indicated that the nutrient conditions of the rubber plantations were generally improved when fertilizer was applied based on nutrient diagnosis, but the soil organic matter content, soil nitrogen content and leaf nitrogen content decreased. The deficiency of nitrogen was a universal phenomenon in the rubber plantations in Xishuangbanna, and it was one of the limiting factors of rubber yield. So it is advised that more nitrogen fertilizer should be applied. Besides, the deficiency of magnesium at Jinghong Farm and of phosphorus at Dongfeng Farm should also be considered in fertilizer application to rubber trees. The latex yield was positively correlated with leaf nitrogen content, 0-20 cm soil organic matter, 0-20 cm soil total nitrogen, 0-20 cm soil available nitrogen and 0-20 cm soil available phosphor; but negatively correlated with the contents of leaf potassium, calcium, magnesium and phosphorus.