[Objective]The objective of the study was to build a model of clonal growth rules of buffalograss (Buchloe dactyloides (Nutt.) Engelm Texoka) under heterogeneous environments.[Method]The growth model of clonal fragment in heterogeneous environments from 0 to 12 weeks was analyzed and fitted with nonlinear models of Logistic and Gompertz.[Result]The clonal growth curves were appropriately fitted, but the Logistic model provide better fitting degree, which is more close to measured value at the same stage of experiment.The clonal tamer multiplication of inflexion was significantly different under various conditions, however the distribution of inflexion stages was relatively concentrate (12.95-14.00 weeks).Amount of cumulative tamers of buffalograss increased under heterogeneous environment compared to homogeneous environment with the same resources available, which indicated that there were water and nutrients transportion and distribution among connected ramets in clonal buffalograss.[Conclusion]Under heterogeneous environment, it is feasible to fit the clonal growth of buffalograss using Logistic nonlinear model, and physiological integration play an important role in increase of the clonal growth of buffalograss.%[目的]揭示野牛草克隆生长规律,建立理想的克隆生长模型,为进一步开发克隆植物的利用价值、选育优良品种提供参考.[方法]运用Logistic和Gompertz两种非线性生长模型,分别对同质及异质环境下各同质小生境内野牛草克隆分株增殖数据进行曲线拟合和分析.[结果]两种模型均能模拟野牛草的生长曲线,但Logistic生长模型拟合优度更高,与实测值也更接近;进一步分析Logistic模型拟合参数发现,不同生境下野牛草克隆片段的分株增殖拐点时期集中在12.95-14.00周,但拐点分株增殖量存在显著差异;与同质环境相比,资源的异质性分布有利于野牛草克隆分株增殖.[结论]野牛草克隆生长符合Logistics模型,环境的异质性与分株增殖速率密切相关,而与分株增殖的拐点时间无显著相关;认为异质生境下相连克隆片段及分株间的生理整合,可有效提高资源的利用效率.
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