地形因子对天山北坡天山云杉林土壤有机碳的影响  

Effects of topographic factors on soil organic carbon in Picea schrenkiana forest on the northern slope of Tianshan Mountain

作　　者：夏晓莹 李思瑶 王杰[1] 马小龙[1] 席丽 米尔扎提·柯尼加里木 阿丽耶·麦麦提 王卫霞[1] XIA Xiaoying;LI Siyao;WANG Jie;MA Xiaolong;XI Li;Mierzhati Kenijialimu;Aliye Maimaiti;WANG Weixia(Key Laboratory of Forestry Ecology and Industrial Technology,Xinjiang Education Department/College of Forestry and Landscape Architecture,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学林学与风景园林学院/新疆教育厅干旱区林业生态与产业技术重点实验室,乌鲁木齐830052

出　　处：《新疆农业科学》2023年第4期965-973,共9页Xinjiang Agricultural Sciences

基　　金：国家级大学生创新创业训练计划项目“不同海拔梯度对天山云杉林土壤有机碳的影响”(202110758008);国家自然科学基金“南疆盆地不同土地利用方式对土壤有机碳库的影响”(31760199)。

摘　　要：【目的】研究地形因子对天山北坡天山云杉林土壤有机碳的影响。【方法】在新疆农业大学实习林场选取不同海拔、不同坡度和不同坡向的样地采集土壤样品,测定土壤有机碳含量并计算其碳密度。【结果】不同海拔梯度下,天山云杉林土壤有机碳含量介于41.65~77.67 g/kg,土壤有机碳密度介于9.47~14.27 kg/m^(2),土壤有机碳含量及密度均随着海拔的升高呈减少的趋势。0~20 cm土层坡度小于15°时,土壤有机碳含量表现为最高(105.08 g/kg),而当坡度达到30°~35°时,土壤有机碳含量最低;不同坡向上土壤有机碳含量从高到低依次为阴坡>半阴坡>半阳坡>阳坡,其中0~20 cm土层阴坡上土壤有机碳含量显著高于阳坡(P<0.05),20~60 cm土层土壤有机碳含量在各坡向之间差异不显著。【结论】天山北坡天山云杉林在高海拔区域内整个剖面土壤有机碳含量分布较低海拔区域相对均匀。坡向对土壤有机碳的再分配作用在20~60cm土层土壤中难以发挥作用。【Objective】To reveal the effects of topographic factors on soil organic carbon in Picea schrenkiana var.Tianschanica forest on the northern slope of Tianshan Mountains.【Methods】Soil samples were collected from plots with different altitudes,slopes and directions in the Internship forest farm of Xinjiang Agricultural University,and the content of soil organic carbon was measured and its carbon density was calculated.【Results】Under different elevation gradients,the soil organic carbon content ranged from 41.65 g/kg to 77.67 g/kg,and soil organic carbon density ranged from 9.47 kg/m^(2)to 14.27 kg/m^(2)in P.schrenkiana var.tianschanica forest.The organic carbon content and density of the soil tended to decrease with increasing altitude.The soil organic carbon content was the highest(105.08 g/kg)when the slope was less than 15°at 0-20 cm soil layer,while the soil organic carbon content was the lowest when the slope reached 30°-35°.The order of soil organic carbon content on different slope directions was:shady slope>semi shady slope>semi sunny slope>sunny slope.The soil organic carbon content on the shady slope was significantly higher than that on the sunny slope at 0-20 cm soil layer(P<0.05),but the soil organic carbon content showed no significant difference among different slope directions at 20-60 cm soil layer.【Conclusion】The distribution of soil organic carbon content in the whole profile of P.schrenkiana var.tianschanica forest on the northern slope of Tianshan mountains is relatively uniform in the high altitude area compared with that in the low altitude area,thus making it difficult to play role in terms of the effect of slope aspect on the redistribution of soil organic carbon in 20-60 cm soil layer.

关 键 词：天山云杉 地形因子 天山北坡 土壤有机碳 

分 类 号：S757[农业科学—森林经理学] S153[农业科学—林学]