橡胶树死皮病的症状及土壤养分含量差异的初步研究

A Preliminary Study of the Syndrome of Tapping Panel Dryness Rubber Tree and Soil Nutrient Content

橡胶树死皮病在云南每年都造成重大的产量损失,为阐明橡胶树死皮病发病机理和防治方法提供依据,通过田间调查比较各种症状类型的比例,采集健康树和死皮树的土壤样品并分析了土壤全氮含量;结果表明：RRIM600品系与GT1品系的橡胶树死皮停割树的比例均随割龄增加而增加,橡胶树停割树割线褐斑的比例,RRIM600品系随割龄增加而增加,而GT1品系则相反,橡胶树停割树褐皮树死皮停割树褐皮的比例随割龄段增加而降低,而GT1品系褐皮的比例则随割龄段增加而增加。不同割龄段（810年,1020年,〉20年）间和不同品系间死皮停割率及内褐、褐皮和割线褐斑所占的比例均有明显差异,RRIMM600品系与GT1品系死皮树的土壤全氮含量较健康树高。

A huge yield loss of rubber was caused by tapping panel dryness（TPD） every year in Yunnan province.Therefore,a tapping panel dryness（TPD） syndrome survey and soil nitrogen content determination was conducted in Mengpeng rubber farm to help elucidate its pathogenesis and make a control measure.The results showed that rate of tapping rest rubber tree for panel dryness increased with the increase of tapping year.The rate of brown spot in tapping panel of RRIM600 clone was increased with tapping year,but rate of brown sheet of GT1 clone was quite the contrary.The rate of tapping rest rubber tree and brown spot between the different tapping year and these two clones is different.The total nitrogen content of 0-20 cm soil of healthy tree is lower than that of panel dryness tree both for RRIM600 and GT1 clone.