| 摘要: |
| 【目的】利用3-PG模型估算江苏南部地区杉木人工林各器官生物量和叶面积指数(LAI)，为杉木人工林可持续经营提供参考。【方法】以苏南丘陵地区杉木人工林为研究对象，结合当地气候和林分观测历史数据确定3-PG模型参数并运行模型，估算杉木人工林的LAI和林分不同器官生物量随林龄的变化趋势，并对预测值和观测值进行显著性分析。【结果】初始林分密度为4 600株/hm2的杉木人工林在5年时林分达到郁闭，LAI为5.5；干生物量在23年达到最大值，为74.5 t/hm2；根和叶的生物量均随着林龄的增加而先增后减，根生物量在第10年达到最大值(17.5 t/hm2)，叶生物量在第6年达到最大值(10.25 t/hm2)。【结论】3-PG模型预测结果较好，除叶生物量外，LAI、干和根生物量预测值均与观测值无显著差异。 |
| 关键词: 杉木 3-PG模型 生物量 叶面积指数(LAI) 生长规律 |
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| 基金项目:江苏省高校自然科学研究项目（14KJB220002）；江苏省科技支撑计划项目（农业部分）（BE2013443）；江苏高校优势学科建设工程项目（PAPD） |
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LIU Kun,CAO Lin,WANG Gui-bin,et al
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| Abstract: |
| 【Objective】The study used the 3-PG model to estimate biomass components and LAI of Chinese fir plantation in southern Jiangsu province to provide reference for management of Chinese fir plantation.【Method】Based on the Chinese fir plantation in southern Jiangsu province,this study applied local meteorological data and long-term field measurements of Chinese fir plantation to parameterize and validate the process-based 3-PG model before it was used to estimate the allocation capacity of biomass of stems,foliage and roots of Chinese fir plantation stands at different ages.Predicted and observed data were compared and significance was analyzed.【Result】With the initial stand density of 4 600 trees/hm2,Chinese fir plantation reached its maximum close canopy with LAI of 5.5 at the age of 5 years,and the stem biomass reached its highest value of 74.5 t/hm2 at the age of 23 years.Both roots biomass and foliage biomass increased before decreasing as the increase of stand age.Roots biomass reached the maximum of 17.5 t/hm2 at the age of 10 years,while the maximum foliage biomass of 10.25 t/hm2 occurred at the age of 6 years.【Conclusion】3-PG model had good prediction results.There was no significant difference between the predicted and observed LAI,roots and stem biomass except foliage biomass. |
| Key words: Chinese fir plantation 3-PG model biomass LAI growth rhythm |
