| 地形因子对青海祁连圆柏林土壤有机碳空间分布的影响 |
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| 引用本文： | 陈志林,强浪浪,向安民,田翠翠,庞军柱,党坤良.地形因子对青海祁连圆柏林土壤有机碳空间分布的影响[J].西北林学院学报,2022,37(6):68-74. |
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| 作者姓名： | 陈志林 强浪浪 向安民 田翠翠 庞军柱 党坤良 |
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| 作者单位： | （1.国家林业和草原局 西北调查规划设计院，旱区生态水文和灾害防治重点实验室，陕西 西安 710048；2.西北农林科技大学 林学院，陕西 杨陵 712100） |
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| 摘 要： | 做为青海三江源区主要森林类型之一，祁连圆柏（Juniperus przewalskii）林提供着重要的生态系统服务功能，尤其在增加青海省陆地生态系统碳储量方面。以青海祁连圆柏林为研究对象，采用野外样地调查、室内试验和数理统计相结合的方法，分析主要地形因子（海拔、坡向、坡位、坡度）对土壤有机碳空间分布的影响。结果表明，祁连圆柏林土壤有机碳密度均值为209.56 t·hm-2。其中，以兴海中铁林场（247.37 t·hm-2）最大，泽库麦秀林场（158.96 t·hm-2）最小，各区域间存在一定差异。青海祁连圆柏林土壤有机碳密度随海拔增加呈先升后降的趋势，其中，以海拔3 500～3 700 m范围最大，为255.93 t·hm-2，海拔2 900～3 100 m最小，为152.03 t·hm-2；土壤有机碳密度随坡度增大而下降，坡度5°～15°最大，为297.22 t·hm-2；下坡位（251.76 t·hm-2）＞中坡位（212.56 t·hm-2）＞上坡位（153.24 t·hm-2）；阳坡土壤有机碳密度（206.72 t·hm-2）略低于阴坡（215.55 t·hm-2）。通过t检验，不同海拔、坡度和坡位间土壤有机碳密度存在差异。总之，在不同立地因子中，海拔和坡位是调控祁连圆柏林土壤有机碳密度的主导因子。
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| 关 键 词： | 祁连圆柏林 土壤有机碳密度 地形因子 通径分析 青海省 |
Effects of Topographical Factors on the Spatial Distribution of Soil Organic Carbon of Juniperus przewalskii Forest in Qinghai Province |
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| CHEN Zhi-lin,QIANG Lang-lang,XIANG An-min,TIAN Cui-cui,PANG Jun-zhu,DANG Kun-liang. Effects of Topographical Factors on the Spatial Distribution of Soil Organic Carbon of Juniperus przewalskii Forest in Qinghai Province[J].Journal of Northwest Forestry University,2022,37(6):68-74. |
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| Authors: | CHEN Zhi-lin QIANG Lang-lang XIANG An-min TIAN Cui-cui PANG Jun-zhu DANG Kun-liang |
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| Affiliation: | (1.Northwest Surveying,Planning and Designing Institute of National Forestry and Grassland Administration,Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid Regions,Xi’an 710048,Shaanxi,China; 2.College of Forestry,Northwest A&F University,Yangling 712100,Shaanxi,China) |
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| Abstract: | As one of the main forest types in Qinghai Province,Juniperus przewalskii forest plays critical role in sequestrating carbon.This study was performed to investigate spatial distribution of soil organic carbon density (SOCD) of Juniperus przewalskii forest in Qinghai Province by soil sampling and laboratory experiments.In addition,the relationships between SOCD and topographical factors (elevation,slope aspect,slope position and slope) were also studied.The results showed that the average SOCD of Juniperus przewalskii forest in Qinghai Province was 209.56 t·hm-2.Soil in Zhongtie Forest Farm of Xinghai County had the highest SOCD (247.37 t·hm-2) and Maixiu Forest Farm of Zeku County had the lowest SOCD (158.96 t·hm-2) among all the sampling regions.The SOCD initially increased and then decreased with the increase of elevation gradient.The SOCD was the highest at 3 500-3 700 m (255.93 t·hm-2) elevation range and was the lowest at the 2 900-3 100 m (152.03 t·hm-2) elevation range.The SOCD in the down slope was higher than those in the middle and up slopes.The SOCD was the highest at 5°-15° (297.22 t·hm-2) slope gradient.The SOCD of shady slope (215.55 t·hm-2) was slightly higher than that of sunny slope (206.72 t·hm-2).According to the results of t-test,there were variations of SOCD among different elevations,slope positions and slopes.In summary,elevation and slope position were the dominant topographic factors that affect SOCD of Juniperus przewalskii forest. |
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| Keywords: | Juniperus przewalskii forestJuniperus przewalskii forest soil organic carbon density path analysis topographic factors Qinghai Province |
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