色季拉山不同植被类型下土壤有机碳的分布特征研究

Distribution Characteristics of Soil Organic Carbon under Different Plants in Sejila Mountain

2012年通过对色季拉山冷杉、金露梅等11种主要分布的植被林下土壤有机碳分布特征进行分析，结果表明，不同植被林下土壤有机碳含量均表现为0～10cm土层〉10～20em土层；在0—10cm土层中，林下有机碳含量变化规律为冷杉〉紫菀〉金露梅〉高山柏〉云杉〉乌柳〉荚蓬〉花楸〉峨眉蔷薇〉杜鹃〉小檗；在10-20cm土层中，林下有机碳含量变化规律为冷杉〉金露梅〉荚莲〉云杉〉紫菀〉峨眉蔷薇〉乌柳〉高山柏〉小檗〉杜鹃〉花楸，且0～10cm土层中有机碳含量变异系数高于10-20cm土层；回归分析表明，土壤有机碳的分布与铵态氮、硝态氮、全氮、速效磷、速效钾之间呈极显著正相关（P〈0．001），其相关系数分别为0．7582、0．9032、0．67、0．6924、0．5853；而与全磷关系不显著。

Distribution characteristics of soil organic carbon under 11 plants in Sejila Mountain were analyzed. The results showed that soil organic carbon content under all plants was 0 ~ 10 cm 〉 10 ~ 20 cm. The order of organic carbon was Abies spectabilis 〉 Radix tataricus 〉 Potentilla fruticosa 〉 Sabina squamata 〉 Picea asperata 〉 Salix chei- lophila 〉 Viburnum dilatatum 〉 Sorbus pohuashanensis 〉 Rosa omeiensis 〉 Rhododendron lapponicum 〉 Berberis angu- losa in 0 - 10 cm layer, Abies spectabilis 〉 Potentilla fruticosa 〉 Viburnum dilatatum 〉 Picea asperata 〉 Aster 〉 Rosa omeiensis Rolfe 〉 Salix cheilophila Schneid 〉 Sabina squamata 〉 Berberis angulosa 〉 Rhododendron 〉 Sorbus po- huashanensis in 10 -20 cm layer. Variation coefficient of soil organic carbon content in 0 - 10 cm layer was higher than that in the 10 -20 cm layer. Regression analysis showed that there was extremely significant positive correla- tion between soil organic carbon and ammonium nitrogen, nitrate nitrogen, total N, available P, available K （P 〈 0. 001 ）, the regression coefficients were 0. 758 2, 0. 903 2, 0.67, 0. 692 4 and 0. 585 3, respectively. There was not significant relation between total P and SOC.