Warming causes variability in SOM decomposition in N‐ and P‐fertiliser‐treated soil in a subtropical coniferous forest
Warming causes variability in SOM decomposition in N‐ and P‐fertiliser‐treated soil in a subtropical coniferous forest
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变暖导致亚热带针叶林中经 N- 和 P- 肥料处理的土壤中 SOM 分解的变化
DOI：
10.1111/ejss.13320
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发表时间：
2022-11
影响因子：
4.2
通讯作者：
Jing Wang
中科院分区：
文献类型：
--
作者：
Yuqian Tang;Xinyu Zhang;Huimin Wang;Shengwang Meng;Fengting Yang;Fusheng Chen;Shaoqiang Wang;Qingxin Dong;Jing Wang
温度和养分有效性在调节土壤碳（C）和氮（N）的分解方面发挥着重要作用，而土壤碳（C）和氮（N）是森林生态系统中有机质积累的主要控制因素。然而，缺乏关于气候变暖下氮沉降和磷（P）添加如何影响亚热带森林土壤碳和氮分解速率的信息。我们测量了亚热带森林土壤中的土壤有机碳和氮矿化率以及相应的外酶活性，该土壤在 10 至 40°C 温度范围的实验条件下添加了六年的氮和/或磷。我们的结果表明，土壤有机质C和N分解率与其相应酶的活性呈正相关，这表明细胞外酶活性可能是对土壤有机质（SOM）分解率的主要影响。氮添加对土壤有机碳矿化和增强氧化酶和水解酶活性具有显着的积极影响。 P添加对土壤有机C和N分解速率影响不大。这些结果挑战了土壤微生物富含氮且磷的有效性限制有机物分解的假设，并提供了额外的证据，证明氮而不是磷调节亚热带森林的有机物分解。虽然氮的添加显着影响土壤碳和氮的分解速率，但对其对温度的敏感性影响不大。相反，P的添加对SOM分解的温度敏感性以及βG和NAG Vmax有显着影响。总体而言，我们的结果表明，SOM 分解容易受到 N 和 P 添加的影响，在预测变暖条件下 SOM 分解和 C 循环可能如何变化时，应考虑这两者。
Both temperature and nutrient availability have essential roles in regulating the decomposition of soil carbon (C) and nitrogen (N), the main controls on organic matter accumulation in forest ecosystems. However, there is a lack of information about how N deposition and phosphorus (P) additions might impact soil C and N decomposition rates in subtropical forests under climate warming. We measured soil organic C and N mineralisation rates and corresponding exoenzyme activities in a subtropical forest soil that had received N and/or P additions for six years in experimental conditions at a range of temperatures between 10 and 40°C. Our results showed that soil organic C and N decomposition rates were positively correlated with the activities of their corresponding enzymes, which suggests that the extracellular enzyme activities could be the main influence on soil organic matter (SOM) decomposition rates. N additions had a significant positive effect on soil organic C mineralisation and enhanced oxidase and hydrolase activities. P additions had little effect on soil organic C and N decomposition rates. These results challenge the assumptions that soil microorganisms are N‐rich and P availability restricts organic matter decomposition, and provides additional evidence that N, not P, regulates organic matter decomposition in subtropical forests. While N additions significantly influenced the soil C and N decomposition rates, they had little effect on their sensitivity to temperature. In contrast, P additions had a significant effect on the temperature sensitivities of SOM decomposition and the βG and NAG Vmax. Overall, our results show that SOM decomposition is vulnerable to both N and P additions, and both should be considered when predicting how SOM decomposition and C cycling might change under warming.
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影响因子：
9.7
作者：
Saiya-Cork, KR;Sinsabaugh, RL;Zak, DR
通讯作者：
Zak, DR
影响因子：
4
作者：
Sinsabaugh, Robert L.;Shah, Jennifer J. Follstad
通讯作者：
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影响因子：
8.8
作者：
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通讯作者：
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影响因子：
6.2
作者：
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通讯作者：
Piao, Shilong
重新考虑热带森林土壤微生物活动的磷限制
影响因子：
5.2
作者：
Taiki Mori;Xiangkai Lu;Ryota Aoyagi;Jiangming Mo
通讯作者：
Jiangming Mo