| 山西省油松人工林的生产力及经营潜力 |
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| 引用本文： | 樊兰英,孙拖焕.山西省油松人工林的生产力及经营潜力[J].水土保持通报,2017,37(5):176-181. |
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| 作者姓名： | 樊兰英 孙拖焕 |
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| 作者单位： | 山西省林业科学研究院,山西太原,030012 |
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| 基金项目： | 山西省青年科技基金项目“典型林分土—林系统养分耦合机制及限制性营养元素判定”（201601D021115） |
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| 摘 要： | 目的]研究山西省油松林生产力动态变化规律,以潜在生产力为目标,对油松人工林生产力提升空间进行预测,为区域林分提质增效提供科学指导。方法]采用分层法和收获法,结合相对生长模型建立油松单木生物量回归方程;采用"累积法"和Thornthwaite memorial模型估算林分现实生产力和潜在生产力。结果]油松林生产力与林龄有着密切的关系,随着林龄的增加,油松林生产力先增加,成熟期开始下降,全省油松林现实生产力平均为4.462t/(hm2·a);乔木层生产力幼林龄期最小,贡献率占72.17%,随着林龄增加,生物量总量继续增加,生产力在近熟林晚期开始下降;草本层贡献率最大值出现在幼龄林期21.16%,而后逐渐降低,相反,灌木层生产力贡献率逐渐增大,林分成熟初期其贡献率超过草本层,是林分结构调整关键期;油松林平均潜在生产力为8.422t/(hm2·a),以此为目标,油松林生产力提质增效至少有32%的空间。结论]山西省油松林生产力提质增效空间为32%,油松林生产力首要限制因子为降雨。
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| 关 键 词： | 油松林 单木生长方程 净初级生产力 潜在生产力 |
| 收稿时间： | 2017/7/7 0:00:00 |
| 修稿时间： | 2017/7/12 0:00:00 |
Net Primary Productivity and Management Potential of Pinus Tabulaeformis Forest in Shanxi Province |
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| FAN Lanying and SUN Tuohuan.Net Primary Productivity and Management Potential of Pinus Tabulaeformis Forest in Shanxi Province[J].Bulletin of Soil and Water Conservation,2017,37(5):176-181. |
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| Authors: | FAN Lanying and SUN Tuohuan |
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| Institution: | Shanxi Academy of Forestry Sciences, Taiyuan, Shanxi 030012, China and Shanxi Academy of Forestry Sciences, Taiyuan, Shanxi 030012, China |
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| Abstract: | Objective] The dynamic variation of net primary productivity of Pinus tabulaeformis forest in Shanxi Province was studied, and the potential for improvement of plantation forest was predicted to provide reference for improving quality of regional forest.Methods] The regression equation was established using the stratification and harvesting method and the relative growth model. Cumulative method and Thornthwaite Memorial model were used to estimate the actual and potential productivity of the forest.Results] The productivity of P. tabulaeformis forest increased with the increase of its age and decreased when it evolved into mature period. The actual productivity of P. tabulaeformis forest was 4.462 t/(hm2·a); The contribution of trees was 72.17% to the total productivity at young stand. With the increase of age, total biomass got increase, but in the sense of productivity, it got decrease when evolved into late near-mature period. The contribution of herb layer was 21.16% in the young forest stage, and decreased latterly. On the contrary, the contribution rate of shrub layer increased gradually, which was more than that of the herb layer in the early mature period, when it is critical for structural management. The average potential productivity of forest was 8.422 t/(hm2·a), implied that there was at least 32% potential room for improvement.Conclusion] The potential room of P. tabulaeformis productivity was at least 32%, and the primary limiting factor of P. tabulaeformis forest productivity in Shanxi Province was rainfall. |
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| Keywords: | Pinus tabuliformis individual tree biomass model net primary productivity potential productivity |
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