不同间作模式对橡胶树热研917生胶性能的影响及其与气候因子的关联度分析OA

[Objective]The study aimed to investigate the impact of intercropping patterns on latex and natural rubber properties in rubber trees(Hevea brasiliensis),explore the association between these properties and climatic factors,and provide a basis and technical support for research on high-quality cultivation techniques for natural rubber.[Method]A field experiment was conducted using 15-year-old tapping trees of the rubber clone Reyan 917.Monoculture rubber served as the control.The effects of intercropping with Alpinia oxyphylla and Amor-phophallus konjac on latex physiology,mineral element content(N,P,K,Mn),raw rubber properties,and molecular weight distribution were compared.[Result](i)Compared to conventional monoculture,both intercropping with A.oxyphylla and A.konjac significantly reduced the total solids content(average decrease0.85%and4.31%,respectively)and dry rubber content(average decrease0.76%and4.07%,re-spectively)of fresh latex,leading to sucrose accumulation within the laticifers.(ii)These intercropping systems reduced the plasticity reten-tion index(PRI)of raw rubber by6.14%and3.41%,decreased the number-average molecular weight(Mn)by7.62%and9.36%,and decreased the weight-average molecular weight(Mw)by 8.29%and 9.58%,respectively.(iii)Significant seasonal variations were observed in latex physiological parameters,mineral element contents(N,P,K,Mn),rubber molecular weight,and raw rubber PRI under all three culti-vation modes.While intercropping did not alter the seasonal trends of these latex physiological parameters and mineral element contents,it de-layed the peak occurrence times for initial plasticity,Mooney viscosity,and the polydispersity index(PDI).(iv)Interactions were observed between latex performance and the properties of the processed raw rubber.Both latex and raw rubber properties were influenced by climatic factors,with air temperature being the primary influencing factor.[Conclusion]Comprehensive analysis indicates that intercropping with A.oxyphylla and A.konjac without fertilization degraded the quality of raw rubber produced from H.brasiliensis.The research results provide data support for the screening of high-quality cultivation modes for rubber trees.