南亚热带森林群落演替过程中林下土壤的呼吸特征

采用CI-310便携式光合作用系统及其附件,测定了广东省黑石顶自然保护区南亚热带森林演替系列中的马尾松林和松阔混交林林下土壤的呼吸速率。测定结果显示:在自然条件下,马尾松林土壤呼吸速率在1.650~4.0μmolCO2m-2s-1,松阔混交林土壤呼吸速率在1.70~3.950μmolCO2m-2s-1之间。林下土壤呼吸速率与温度和土壤空气相对湿度可用拟合,据此并结合当地气象资料推算出马尾松林和松阔混交林的年均土壤呼吸量分别为31.027、36.629 tCO2hm-2,后者高于前者。

Study on soil respiration of the lower subtropical successive forest communities

The measurement of soil respiration rate was carried out by CD-310 portable photosynthesis system and its appendixes in two successive forests serial,coniferous forest (Pinus massoniana forest) and coniferous broad-leaved mixed forest (P. masoniana-Schima surperba-Castanopsis kaiuakamii forest),of the lower subtropical vegetation in Heishiding Natural Reserve,Guangdong,China. The results showed that soil respiration rate of coniferous forest was 1. 650-4. 0 μmolCO2m-2 s-1 and 1. 70-3. 950 μmolCO2m-2 s-1 for coniferous broad-leaved mixed forest under natural conditions. The relationship among the soil respiration rate (SRR), soil temperature and soil relative humidity were obtained as. And this function was used to estimate annual soil respiration amount of these two forests according to local meteorological records. As a result, the annual soil respiration amount was estimated as 31. 027 tCO2hm-2 for coniferous forest, and 36. 629 tCO2hm-2 for coniferous broad-leaved mixed forest,the later was higher than the former.