کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6542901 | 159185 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Autotrophic and heterotrophic respiration of a poplar plantation chronosequence in northwest China
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Autotrophic and heterotrophic respiration of a poplar plantation chronosequence in northwest China Autotrophic and heterotrophic respiration of a poplar plantation chronosequence in northwest China](/preview/png/6542901.png)
چکیده انگلیسی
The partitioning of soil respiration is helpful for understanding the mechanism of soil CO2 production and for estimating net forest C budget. We investigated heterotrophic (Rh) and autotrophic (Ra) components of soil CO2 efflux (Rs) in a poplar chronosequence (3-, 8-, and 15-yr-old) using a trenching method in 2007 and 2008. Our results showed that Rh and Ra varied with stand age. Mean Rh increased from 1.85 μmol mâ2 sâ1 in the 3-yr-old stand to 2.59 μmol mâ2 sâ1 in the 15-yr-old stand, while Ra decreased from 3.41 μmol mâ2 sâ1 in the 3-yr-old stand to 1.89 μmol mâ2 sâ1 in the 15-yr-old stand. There was a significant stand-age effect on Ra. Autotrophic respiration in the three stands all peaked in June, while the maximum Rh and soil temperature occurred in July. The seasonal variations of Ra and Rh could be well explained by soil temperature (P < 0.01). The contribution of Ra to Rs during the growing season was 57.1% averaged over the three stands. We found that Rh was positively correlated with dead fine root biomass (P < 0.01) and with forest floor litter mass (P < 0.05), and that Ra was significantly correlated with live fine root biomass. The root respiration significantly decreased with stand age, which was explained by a decrease in live fine root biomass over the age sequence, whereas the increase of heterotrophic respiration could be attributed predominantly to an increase in the labile C input with stand age. Our results highlight the importance of stand-age effects on different components of soil respiration and its significance to the estimation of forest C sink potential over a rotation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 337, 1 February 2015, Pages 119-125
Journal: Forest Ecology and Management - Volume 337, 1 February 2015, Pages 119-125
نویسندگان
Meifang Yan, Nan Guo, Hongrui Ren, Xinshi Zhang, Guangsheng Zhou,