Long-term phosphorus addition strongly weakens the carbon sink function of a temperate peatland
Long-term phosphorus addition strongly weakens the carbon sink function of a temperate peatland
复制标题
长期磷添加强烈削弱温带泥炭地的碳汇功能
DOI：
10.1007/s10021-022-00754-9
复制
发表时间：
2023
期刊：
影响因子：
3.7
通讯作者：
Bu Z-J
中科院分区：
文献类型：
--
作者：
Lu F;Wu J;Yi B;Xu Z;Wang M;Sundberg S;Bu Z-J
Peatlands are important nutrient-limited, carbon (C)-accumulating ecosystems where phosphorus (P) is one major limiting nutrient. An increase in P input to peatlands has been observed close to agricultural areas. However, the effects of P input on gross primary productivity (GPP), ecosystem respiration (ER) and net ecosystem exchange (NEE) of peatlands, especially in temperate Asia, have been rarely studied. We selected the P addition plots of a 12-year experiment simulating environmental change in a peatland in northeastern China to evaluate the effect of P addition (5 and 10 kg ha−1y−1) on carbon dioxide fluxes. Our results showed that the growth ofSphagnumwas inhibited but that of vascular plants was facilitated by P addition, resulting in an unchanged GPP. P addition increased ER due to the increased activity potentials ofN-acetyl-β-glucosaminidase (NAG) and polyphenol oxidase (POX) that might, in turn, increase the metabolic rate of soil microbes and enhance the decomposition of peat. During the growing season, a mean net CO2absorption of 0.002 mg m−2s−1was observed at high levels of P addition, which was much lower than that of 0.063 mg m−2s−1in the controls. The results suggest that long-term P addition will greatly weaken the C sequestration in peatlands by enhancing ER rather than reducing GPP. Our study highlights the importance of the response of vegetation and soil enzyme activities to P addition regarding peatland respiration and C sink function.
