摘要
调查分析祁连山北坡土壤有机碳和全氮含量随海拔变化的趋势及其与气候要素和植被的关系。结果显示:就土壤有机碳含量,在0～5cm、5～1 5cm和1 5～30cm土层,低海拔(2200m)和高海拔(3600m)处较低,中间海拔(3000～3500m)处较高;灌丛草甸>森林>高寒草甸>干旱草原>荒漠草原(P<0.05)。就土壤全氮含量,0～5cm和5～1 5cm土层,3400m和3500m处较高,2200m和2800m处较低;1 5～35cm土层,3400m处较高、2200m和2800m处较低;0～5cm土层,灌丛草甸>高寒草甸>森林>干旱草原>荒漠草原;5～1 5和1 5～35cm土层,灌丛草甸>森林>高寒草甸>干旱草原>荒漠草原(P<0.05)。就土壤碳氮比,在0～5cm、5～1 5cm和15～30 cm土层,3000m和3200m处最高;2300m和2800m处最低;森林>灌丛草甸>高寒草甸>干旱草原或荒漠草原。土壤有机碳和全氮含量及碳氮比总体上都随年均温度增加而降低,随年降水量增加而增加。不考虑海拔差异,0～5cm、5～1 5cm和1 5～30cm土层土壤有机碳和全氯含量相关系数较高;考虑海拔差异,在不同土层和海拔的差异较大。
The SOC（soil organic carbon） and total nitrogen content in different elevations on the northern slope of Qilian Mountain and its relationship with climatic factors and vegetation were investigated. The results showed that the SOC content in 0-5cm, 5-15cm and 15-30cm soil depth were all the lowest at low elevations（2300m and 2800m） and high elevation（3600m）, while which was the highest at middle altitudes （3000-3500m）.Additionally, the SOC in these depths followed the pattern： shrub meadows〉forest〉alpine meadows〉steppe〉desert steppe. The total soil nitrogen in 0-5cm and 5-15cm soil depth were both the highest at 3400m and 3500m altitudes and were the lowest at 2300m and 2800m elevations, and it in 15-35cm soil depth were the highest at 3400m elevation and the lowest at 2300m and 2800m elevations.Additionally, the total soil nitrogen in 0-5cm soil depth followed the pattern：shrub meadows〉 alpine meadows 〉 forest 〉steppe〉desert steppe, and which in 5-15cm and 15-35cm soil depths followed the pattern： shrub meadows〉 forest〉 alpine meadows〉steppe〉desert steppe. The soil C：N in 0-5cm,5-15cm and 15-30cm soil depths were the lowest at low elevations（2300m and 2800m）, while it was the highest at altitudes of 3000m and 3200m.Additionally, soil C： N in these soil depths followed the pattern： forest 〉 shrub meadows 〉alpine meadows〉steppe〉desert steppe. The SOC, total soil nitrogen and soil C：N generally decreased with increasing mean annual temperature and increased with increasing annual precipitation. The correlation coefficients between the content of SOC and total soil nitrogen was higher without considering the difference of elevation; while the coefficients was different greatly in different soil depth and elevation when considering the difference of elevations.
出处
《中国园艺文摘》
2010年第3期27-34,共8页
Chinese Horticulture Abstracts
关键词
土壤有机碳
土壤全氮
祁连山
气候要素
植被
soil organic carbon
total soil nitrogen
Qi Lian Mountain
climatic factors
vegetation
