| 摘要: |
| [目的]精确估计火地塘天然次生油松林土壤有机碳密度和储量.[方法] 基于林下灌木、草本群落特征数据,采用分层抽样法确定研究区土壤剖面的调查数量,对调查样地上、中、下3“层”的土壤有机碳分布规律及其与天然次生油松林下植物物种多样性的相关性进行了研究.[结果] 上“层”土壤有机碳密度变化较小,变化幅度为56.60～71.98 Mg/hm2,变异系数为8.26%;而“中、下”层土壤有机碳密度波动较大,变化幅度为22.83～59.45和38.33～85.82 Mg/hm2,变异系数分别为15.91%和22.94%;随着土层深度的增加,土壤有机碳密度下降。土壤有机碳密度与植物物种多样性无明显相关性.[结论] 在95%的可靠性下,抽样估计的相对误差为±11.13%时,研究区土壤有机碳密度为(60.492±6.73) Mg/hm2;0～40 cm土层土壤有机碳储量为72.59 Mg。 |
| 关键词: 秦岭 天然次生油松林 土壤有机碳密度 土壤碳贮量 分层抽样法 |
| DOI： |
| 分类号: |
| 基金项目:中国森林生态质量状况评估与报告技术项目（2006 BAD03 A0702/wb04）；西北农林科技大学研究生创新计划项目（05ych027） |
|
| Traits of soil organic carbon density in Pinus Tabulaeformis secondary forest at Huoditang valley forest area in Qinling moutains |
|
|
| Abstract: |
| 【Objective】 Soil quality, environment and climate change could be violently affected by soil organic carbon pools.It is vital to estimate soil organic carbon density（SOCD）and its storage more accurately on natural secondary Pinus tabulaeforims forest land at Huoditang valley in Qinling mountains so that carbon balance of whole forest ecosystem could be better understood.【Method】 Based on data of shrub and herbage community traits under arbor layer,quantities of soil profiles were given out under predefined accuracy by stratified sampling method.Both distributing traits of soil organic carbon and relevance between SOCD and biodiversity indices of plant species were analyzed in plots from layers classified as upperparts,middle and under-parts.【Result】 The findings indicated as follows:SOCD in the upper part of slope remained stable;The varying scales (VC) and coefficient of variance (CV) was from 56.60 Mg/hm2 to 71.98 Mg/hm2 and 8.26% respectively;But SOCD in the middle and under part of slope varied abruptly from 22.83to 59.45 Mg/hm2，and from 38.33 to 85.82 Mg/hm2 respectively;The corresponding CV was15.91% and 22.94% respectively;With the increase of soil depth;and SOCD decreased. SOCD was irrelevant to indices of plant species. 【Conclusion】 The average SCOD was (60.492±6.73) Mg/hm2 under the accuracy of 95% and relative error scale ±11.13%.The soil organic carbon reserve in depth of 40 cm in the study area was 72.59 Mg. |
| Key words: Qinling mountains natural secondary Pinus tablaeformis forest soil organic carbon density soil organic carbon reserve method of stratified sampling |
