金沙江头塘小流域人工林有机碳及其剖面分布特征

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采用野外调查、室内分析并结合相关的方法,研究探讨了金沙江头塘小流域7种不同植被恢复人工林土壤剖面层次有机碳(SOC)含量、有机碳密度(SOCD)和有机碳储量及分布特征。结果表明,不同林分类型及土层间土壤SOC含量存在明显差异:就整个土层(0~100 cm)而言,7种林分土壤SOC平均含量介于6.46±1.67~24.95±2.32 g·kg–1,大小依次为柳杉林>旱冬瓜林>圆柏林>栓皮栎林>圣诞树林>墨西哥林>藏柏林,且差异显著(p<0.05);7种林分土壤SOC含量均出现表聚现象,从表层到深层都呈现递减趋势,且具有一定的规律性;7种林分土壤容重总体上均表现为随土层深度的增加逐渐增加,土壤容重表现为:柳杉林>栓皮栎林>圣诞树林>圆柏林>旱冬瓜林>墨西哥柏林、藏柏林;7种林分土壤有机碳密度垂直分布和土壤有机碳含量垂直分布特征一致,随土层深度增加土壤有机碳密度减少,以表土10 cm的土壤有机碳密度最大;有机碳储量均随着土层加深所占比例逐渐降低,同时土壤有机碳主要集中于土层0~40 cm内,分别占总有机碳的65.60%(圣诞树林)、63.16%(旱冬瓜林)、54.41%(墨西哥柏林)、58.56%(圆柏林)、62.96%(藏柏林)、61.70%(栓皮栎林)和56.37%(柳杉林),0~40 cm土层土壤有机碳占总有机碳的百分比均达到50%以上。 Field investigation, indoor analysis and related methods were used to investigate the effects of soil organic carbon (SOC), organic carbon (SOC) and organic carbon storage and distribution in seven vegetation communities in Toutang Small Watershed, Jinsha River. feature. The results showed that there was a significant difference in soil SOC content between different forest types and soil layers. The average soil SOC of the 7 stands ranged from 6.46 ± 1.67 to 24.95 ± 2.32 g for the entire soil layer (0-100 cm) (P <0.05). The soil SOC content of the 7 stands showed that the polygalacturonic acid content in the forest was higher than that in the forest, The phenomenon of soil bulk density showed a decreasing trend from the surface to the deep, and had certain regularity. The soil bulk density of 7 stands showed an overall increase with the increase of soil depth. The soil bulk density showed as follows: Cryptomeria fortunei> Quercus variabilis> Christmas forest> Round Berlin> Dry winter melon forest> Berlin, Cibin, Mexico; The vertical distribution of soil organic carbon density and the vertical distribution of soil organic carbon were the same in the seven stands. With the increase of soil depth, the organic carbon density decreased. cm. The organic carbon storage decreased with the deepening of the soil layer. At the same time, the soil organic carbon mainly concentrated in the soil layer 0-40 cm, accounting for 65.60% of the total organic carbon (Christmas tree forest) , 63.16% (dry gourd forest), 54.41% (Berlin, Mexico), Soil organic carbon accounted for more than 50% of the total organic carbon in the soil layers of 58-40%, 58.56% (Round Berlin), 62.96% (Cibing), 61.70% (Quercus variabilis forest) and 56.37% (Cryptomeria fortunei)
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