中文摘要：

划分土壤表面公司 ₂ 流出的呼吸部件在理解碳周转并且在响应陆地使用变化识别土壤碳下沉 / 采购功能是重要的。改变气候模式上的土壤呼吸部件的敏感不充分当前被理解。我们使用了沟和同位素的方法把全部的土壤呼吸分开成自造营养物质(R _A ) 和不是自养的部件(R _H ) 。这研究在 Robinia pseudoacacia L 上被承担。在南部的 Taihang 山的种植园，中国。土壤 ¹³ 公司 ₂ 被比较 ¹³ 在 50 的深度从煤气的蒸汽探查工具包与结果从埋葬的钢试管提取的土壤公司 ₂ 的 C ? 在初步的测试(2.03 ) 的厘米。结果证明自造营养物质的呼吸的贡献() 与增加土壤深度增加了的 fR _{。不是自养的呼吸的贡献(fR H ) 与增加土壤深度衰退了。自造营养物质的呼吸的贡献是类似的是否由沟方法估计了(fR A ,23.50%) 或由在的同位素的方法在 ¹³ 在土壤和植物之间的 C 处于自然国家占优势(RC， 21.03%) 。沟方法生产的试验性的错误作为与由同位素的方法生产了那相比不足道，提供进一步的调查的一个技术基础。}

英文摘要：

Partitioning the respiratory components of soil surface CO2 efflux is important in understanding carbon turnover and in identifying the soil carbon sink/source function in response to land-use change. The sensitivities of soil respiration components on changing climate patterns are currently not fully understood. We used trench and isotopic methods to separate total soil respiration into autotrophic （RA） and heterotrophic components （RH）. This study was undertaken on a Robinia pseudoacacia L. plantation in the southern Taihang Mountains, China. The fractionation of soil ^13CO2 was analyzed by comparing the δ^13C of soil CO2 extracted from buried steel tubes with results from Gas Vapor Probe Kits at a depth of 50 cm.at the preliminary test （2.03‰）. The results showed that the contribution of autotrophic respiration （fRA） increased with increasing soil depth.The contribution of heterotrophic respiration （fR/4） declined with increasing soil depth. The contribution of autotrophic respiration was similar whether estimated by the trench method （fRA, 23.50%） or by the isotopic method in which a difference in value of ^13C between soil and plant prevailed in the natural state （RC, 21.03%）. The experimental error produced by the trench method was insignificant as compared with that produced by the isotopic method, providing a technical basis for further investigations.