| 秦岭主要林区锐齿栎林营养积累和分布的特点 |
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| 引用本文： | 土晓宁,刘广全.秦岭主要林区锐齿栎林营养积累和分布的特点[J].西北林学院学报,2000,15(1):1-8. |
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| 作者姓名： | 土晓宁 刘广全 |
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| 作者单位： | 1. 西北农林科技大学,林业科学院,陕西,杨陵,712100
2. 西北农林科技大学,资源学院,陕西,杨陵,712100 |
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| 基金项目： | 原林业部重点课题“森林生态系统研究”的部分内容 |
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| 摘 要： | 秦岭锐齿栎林包括 0～ 6 0 cm土层的营养元素总储量为 182 .6 44 7～ 394.1990 t/hm2 ,土壤层的占 97.96 %～ 99.39%。林分的生物量为 131.36 0～ 5 0 3.82 2 t/ hm2 ,乔木层占 92 .1%～ 99.2 % ;植被层营养元素积累量为 1495 .0 16～ 5 5 31.80 3kg/ hm2 ,乔木层占85 .3%～ 98.0 %。凋落物层现存量和营养元素积累量分别为 2 .897～ 33.999t/ hm2和10 4.339～ 1136 .5 36 kg/ hm2。在一定范围内 ,随着林分密度的增加 ,其生物量和营养元素积累量随之增加 ,林分对营养元素的利用率和树干、树冠亦增大 ;立地条件及林分条件相似的林分 ,其生物量和营养元素积累量与林龄呈正相关。林分的树种组成对生物量的影响远不及对营养元素积累量的影响 ,林分内针叶树所占比例越大 ,营养元素的积累量越小。同一地区 ,立地条件和林分状况相似 ,林分类型不同 ,生物量及营养元素积累量差别不大 ;树种组成和林分类型不同 ,林分的生物量和营养元素积累量均不同。不同地区 ,生态条件和林分状况相似 ,林分的生物量和营养元素积累量也有一定的差异 ;相同林型、结构相似的林分 ,其生物量和营养元素积累量南坡大于北坡 ,中段远大于东、西段。锐齿栎林对营养元素的利用率随海拔高度的升高而降低
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| 关 键 词： | 秦岭 锐齿栎林 营养元素 积累 分布 |
The Properties of Nutrient Accumulation and Distribution of Sharptooth Oak Stands in Main Forest Regions of Qinling Mts. |
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| Tu Xiaoning,Liu Guangquan.The Properties of Nutrient Accumulation and Distribution of Sharptooth Oak Stands in Main Forest Regions of Qinling Mts.[J].Journal of Northwest Forestry University,2000,15(1):1-8. |
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| Authors: | Tu Xiaoning Liu Guangquan |
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| Abstract: | The amout of nutrient accumulation including soil layer 0~60 cm in the ecosystems of sharptooth oak stands in Qinling Mts. was 182.644 7~394.199 0 t/hm 2 in which 97.96 %~99.39% was in soil layer. The total biomass and its nutrient contents of the stands were 131.360~503.822 t/hm 2 and 1 495.016~5 531.803 kg/hm 2 with percentages of arbor layers 92.1%~99.2% and 85.3%~98.0% respectively. The amout of litter and its nutrient contents of the stands were 2.897~33.999 t/hm 2 and 104.339~1 136.536 kg/hm 2 respectively. To a certain extent, biomass and nutrient accumulation contents of the stand increased with stand density and stand age similar to the utilization efficiency of the stand to soil nutrient elements and trunk and canopy ratio. Tree composition of the stand influenced nutrient accumulation contents much more than biomass, the more broad leaved trees of tree composition, the higher nutrient accumulation contents of the stand. In the same region, biomass and its nutrient contents of the stand with similar site factors and stand factors had no remarkable difference among different forest types, but had difference among different forest types and tree composition. In different regions, biomass and its nutrient contents of the stand with similar site factors and stand factors had difference,with orders of the stand to soil nutrient elements decreased from lower elevation to higher elevation,from south slope to north, from middle section to east and west section. |
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| Keywords: | Qinling Mts Quercus aliena var acuteserrata stands nutrient elements accumulation distribution |
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