| 黄土丘陵区柠条灌木林合理平茬期的研究 |
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| 引用本文： | 程积民,胡相明,赵艳云.黄土丘陵区柠条灌木林合理平茬期的研究[J].干旱区资源与环境,2009(2). |
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| 作者姓名： | 程积民 胡相明 赵艳云 |
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| 作者单位： | 中国科学院水利部水土保持研究所;西北农林科技大学;滨州学院山东省黄河三角洲生态环境重点实验室; |
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| 基金项目： | 国家重点基础研究发展计划973项目(2007CB106803);;国家科技支撑课题(2006BAD09B08);;国家自然科学基金重点项目(30230290);;国家林业局荒漠化监测专项资助 |
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| 摘 要： | 本文根据柠条(Caragana korshinskii)生长的特点,即生长速率随灌木林龄的变化呈近似正态分布的特征曲线,根据曲线的几何特征,提出以柠条生长速率与峰值和右拐点连线的斜率相等的点为平茬始点,以几何曲线的右拐点为平茬终点的平茬方案。长期观测结果表明,柠条生长指标符合Logistic方程,本文以Logistic生长函数为例,说明了柠条灌木林平茬时间确定方法的具体推导过程。最后结合柠条生长指标(株高、分枝和生物量),对不同立地条件下柠条灌木林的合理平茬时间进行了探讨,结果表明,不同立地条件下柠条的合理平茬时间存在一定的差异,这种现象是由不同立地条件下水热环境的差异造成的。
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| 关 键 词： | 黄土丘陵区 柠条 平茬 Logistic函数 |
Study on the Reasonable Cutting Ages of Caragana korshinskii in the Loess Hilly and Gully Region |
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| CHENG Ji-min,HU Xiang-ming,ZHAO Yan-yun.Study on the Reasonable Cutting Ages of Caragana korshinskii in the Loess Hilly and Gully Region[J].Journal of Arid Land Resources and Environment,2009(2). |
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| Authors: | CHENG Ji-min HU Xiang-ming ZHAO Yan-yun |
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| Institution: | 1.Institute of Soil and Water Conservation;Chinese Academy of Sciences and Ministry of Water Resources;Northwestern Sci-Tech University of Agriculture and Forestry;Yangling 712100;2.Key Laboratory of Eco-environment Sciences of Yellow River Delta of Shandong Province;Bin Zhou University;Binzhou 256600;China |
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| Abstract: | Based on the growth characteristics of Caragana korshinskii,growth speed changing with tree age fitting the approximate characteristic curve of normal distribution.The descent velocity of growth speed curve is equal to the slope of the straight line through peak and right turning point in the curve,the first intermediate felling may begin,but the cutting age cannot be elder than the age of the right turning point of the curve.Long term researches showed that the growth indices of Caragana korshinskii fitted... |
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| Keywords: | loess hilly region Caragana korshinskii cutting logistic function |
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