亚热带岩溶山区植被演替和夏季土壤CO2浓度动态关系

对南川市金佛山西坡相近的环境条件下不同植被类型土壤CO2 浓度及其主要环境因子进行连续观测的基础上 ,采用空间换时间的方法对植被演替对夏季土壤CO2 浓度的动态影响作了详细的研究 ,认为 :土壤CO2 随气温的变化有明显的日变化 ,降水对其浓度也有较大的影响 ,其变化过程及CO2 浓度剖面动态与植被类型有关 ;不同植被条件下土壤CO2 浓度月动态受环境因素影响显示出的差异不大 ,但浓度值水平有很大差别 ;植被演替是岩溶和土壤吸收CO2 作用的重要促进因素 .

The Research of the Relationship Between Vegetation Succession and Soil CO2 Concentration Dynamics in Subtropic Karst Area in Summer

Based on the continuous investigation on soil CO_2 concentration and main environment factor of different vegetation types in similar environment conditions in west district of Mount Jinfo of Nanchuan city, chongqing municipality, with the method of conversion from space to time, the relationship between vegetation succession and soil CO_2 concentration dynamics in summer are researched. Some preliminary conclusions are drawn as follows: soil CO_2 concentration has distinct change in a day with temperature change, and is effected by precipitation, its change process and the profile dynamics of CO_2 concentration in soil have close relationship with vegetation types; soil CO_2 concentration dynamics in a month effected by environment factors shows little difference, but concentration level varies greatly; based on the measuration of dissolution rate of standard limestone tables and hydrochemical analysis of water in different soil, vegetation succession is an important promotive factor to karstification and soil absorbency of CO_2.