4.7 Article

Soil temperature and biotic factors drive the seasonal variation of soil respiration in a maize (Zea mays L.) agricultural ecosystem

期刊

PLANT AND SOIL
卷 291, 期 1-2, 页码 15-26

出版社

SPRINGER
DOI: 10.1007/s11104-006-9170-8

关键词

biomass; net primary productivity; soil respiration; soil temperature; temporal variation

向作者/读者索取更多资源

The diurnal and seasonal variation of soil respiration (SR) and their driving environmental factors were studied in a maize ecosystem during the growing season 2005. The diurnal variation of SR showed asymmetric patterns, with the minimum occurring around early morning and the maximum around 13:00 h. SR fluctuated greatly during the growing season. The mean SR rate was 3.16 mu mol CO2 m(-2) s(-1), with a maximum of 4.87 mu mol CO2 m(-2) s(-1) on July 28 and a minimum of 1.32 mu mol CO2 m(-2) s(-1) on May 4. During the diurnal variation of SR, there was a significant exponential relationship between SR and soil temperature (T) at 10 cm depth: SR = alpha e(beta T). At a seasonal scale, the coefficient alpha and beta fluctuated because the biomass (B) increased alpha, and the net primary productivity (NPP) of maize markedly increased beta of the exponential equation. Based on this, we developed the equation SR = (aB + b)e((cNPP+d)T) to estimate the magnitude of SR and to simulate its temporal variation during the growth season of maize. Most of the temporal variability (93%) in SR could be explained by the variations in soil temperature, biomass and NPP of maize. This model clearly demonstrated that soil temperature, biomass and NPP of maize combined to drive the seasonal variation of SR during the growing season. However, only taking into account the influence of soil temperature on SR, an exponential equation over- or underestimated the magnitude of SR and resulted in an erroneous representation of the seasonal variation in SR. Our results highlighted the importance of biotic factors for the estimation of SR during the growing season. It is suggested that the models of SR on agricultural sites should not only take into account the influence of soil temperature, but also incorporate biotic factors as they affect SR during the growing season.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据