【摘要】 以古尔班通古特沙漠不同生态型梭梭为研究对象,以过渡径(D)和株高(H)为变量,分别建立了沙质、壤土、盐土和砾石四个生态型梭梭年龄预测模型,经过精度评估和回检得出四种生态型的最优模型。结果显示:在盐土生态型上加权平均年龄为6.81年,最大年龄为22年;砾石生态型加权平均年龄为8.21年,最大的年龄为31年;壤土生态型加权平均年龄为14.59年,最大年龄是36年;沙质生态型加权平均年龄为10.86年,最大的年龄为32年。更多还原

【Abstract】 Taking Haloxylon ammodendron in the Gurbantongut Desert as the research object,age estimation model was set up by taking diameter ( D) and height ( H) as variables in the sandy soil,loam,saline soil and gravel quality. By accuracy evaluation and back-check,optimal model of the four ecotype was obtained. The weighted average age was 6. 81 years old,maximum age was 22 years old in the saline soil. The weighted average age was 8. 21 years old,maximum age was 31 years in the gravel quality. The weighted average age was 14. 59 years,maximum age was 36 years in the loam. The weighted average age was10. 86 years,maximum age was 32 years in the sandy soil.更多还原