Partitioning nocturnal respirations and their respective δ13C signatures in a wheat–maize rotation
Partitioning nocturnal respirations and their respective δ13C signatures in a wheat–maize rotation
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小麦-玉米轮作中夜间呼吸及其各自的 δ13C 特征的划分
DOI：
10.1016/j.agrformet.2021.108490
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发表时间：
2021-09
影响因子：
6.2
通讯作者：
Yucui Zhang
中科院分区：
文献类型：
--
作者：
Yuying Wang;Yuming Zhang;Xiaoxin Li;Wenxu Dong;Chunsheng Hu;Yucui Zhang
采用室内、涡度相关和质谱分析方法，对华北平原小麦-玉米轮作区的夜间呼吸组分（Fr，生态系统呼吸; Frs，土壤呼吸; Frsh，异养呼吸; Fraa和Frab，地上和地下的自养呼吸）及其碳同位素特征（δr，δrs，δrsh，δraa和δrab）进行了4年的定位研究。Fr、Frs、Fraa和Frab的年变化趋势与植物生长发育、施氮量、灌溉和降水事件呈双峰曲线关系。小麦季Frs、Frsh、Fra和Frb分别占Frs的43.4、13.5、56.6和29.9%，玉米季分别占Frs的34.0、15.2、66.0和18.8%.玉米季Fr、Frs、Frsh、Fraa和Fra的年平均值分别是小麦季的2.18、1.71、2.45、2.54和1.37倍。小麦季δr、δrs、δrsh、δraa和δrabin的年平均值分别比玉米季高5.84%、10.4%、9.84%、9.63%和11.6%。小麦（C3）季的δ raa和δrabmeans较玉米（C4）季显著亏缺，这是由于两个系统光合碳代谢的不同所致。土壤温度导致土壤呼吸的滞后响应（2-3小时），表明温度的因果关系中的作用。较高的土壤温度和孔隙水（≥ 50%）使δ 13 CO2特征降低。总体而言，本研究揭示了小麦-玉米轮作中夜间呼吸组分的碳平衡及其各自的δ 13 CO2特征。
We conducted a four-yearin situexperiment using chamber, eddy covariance, and mass spectrometry methods to partition nocturnal respiratory components (Fr,ecosystem respiration; Frs,soil respiration; Frsh, heterotrophic respiration; Fraaand Frab,above and below ground autotrophic respirations) and their respective carbon isotopic signatures (δr, δrs, δrsh, δraa, and δrab) in a wheat–maize rotation in the North China Plain. The annual patterns in Fr, Frs, Fraa, and Frabshowed a bimodal curve in response to plant development, nitrogen fertilization, irrigation and precipitation events. Frs, Frsh, Fraaand Frabaccounted for 43.4, 13.5, 56.6 and 29.9 % of Frin the wheat season and 34.0, 15.2, 66.0 and 18.8 % of Frin the maize season, respectively. The annual values of Fr, Frs, Frsh, Fraa, and Frabin the maize season were 2.18, 1.71, 2.45, 2.54, and 1.37 times those in the wheat season, respectively. In comparison, the annual values of δr, δrs, δrsh, δraa, and δrabin the wheat season were 5.84, 10.4, 9.84, 9.63, and 11.6 % more depleted than those in the maize season, respectively. The δraaand δrabmeans in the wheat (C3) season significantly depleted than those in the maize (C4) season due to the different photosynthetic carbon metabolisms in the two systems. Hysteretic response (2-3 hours) where soil temperature leads soil respiration was found, suggesting a causal role of temperature in the relationship. Higher soil temperature and water filled pore space (≥ 50 %) depleted δ13CO2signatures. Overall, this study revealed the carbon balance of nocturnal respiratory components and their respective δ13CO2signatures in a wheat-maize rotation.
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华北平原冬小麦、夏玉米轮作农田的碳收支
DOI：
10.1016/j.agee.2015.03.016
发表时间：
2015-08
期刊：
Agriculture, Ecosystems and Environment
影响因子：
--
作者：
Yuying Wang;Chunsheng Hu;Wenxu Dong
通讯作者：
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影响因子：
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DOI：
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发表时间：
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期刊：
The New phytologist
影响因子：
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通讯作者：
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影响因子：
6.2
作者：
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