Grazing exclusion increases soil CO2 emission during the growing season in alpine meadows on the Tibetan Plateau
Grazing exclusion increases soil CO2 emission during the growing season in alpine meadows on the Tibetan Plateau
复制标题
青藏高原高寒草甸生长季禁牧增加土壤二氧化碳排放
DOI：
10.1016/j.atmosenv.2017.11.053
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发表时间：
2018-02
影响因子：
5
通讯作者：
Long R.
中科院分区：
文献类型：
--
作者：
Guo N.;Wang A.;Degen A.A.;Deng B.;Shang Z.;Ding L.;Long R.
土壤CO2排放是陆地碳循环的重要组成部分。围栏封育通常被认为是恢复退化草地的一种有益的草地管理选择，但其对青藏高原东北部土壤CO2排放的影响是模棱两可的，这是本研究的主题。从2008年7月到2009年4月，我们使用封闭的静态箱每周测量一次高山草甸和高山灌丛草甸放牧和禁牧条件下的土壤CO2日通量。同时，用数字温度传感器测量了5 cm、10 cm、15 cm和20 cm深度的土壤温度。结果表明：结果表明：（1）在整个生长季内，未放牧草地的土壤CO2排放量大于放牧草地，（2）高寒灌丛草甸的土壤CO2排放量大于高寒草甸，高寒草甸和高寒灌丛草甸的土壤CO2年累积排放量分别为241.5- 326.5gC/m2和429.0- 512.5gC/m2;（3）土壤CO2通量季节变化明显，生长季大于非生长季;（4）土壤CO2通量日变化均为单峰型。此外，土壤CO2通量与5 cm处的土壤温度呈显著正相关，而与其他深度的土壤温度无显著相关性。结果表明，禁牧增加了青藏高原东北部高寒草甸和高寒灌丛草甸生长季土壤CO2排放，减少了土壤固碳。由于土壤温度的升高会增加土壤CO2的排放通量，因此全球变暖可能会对未来土壤CO2的排放产生影响。
Soil CO2emission is a key part of the terrestrial carbon cycle. Grazing exclusion by fencing is often considered a beneficial grassland management option to restore degraded grassland, but its effect on soil CO2emission on the northeastern Tibetan Plateau is equivocal and is the subject of this study. Using a closed static chamber, we measured diurnal soil CO2flux weekly from July, 2008, to April, 2009, in response to grazing and grazing exclusion in the alpine meadow and alpine shrub meadow. Concomitantly, soil temperature was measured at depths of 5 cm, 10 cm, 15 cm and 20 cm with digital temperature sensors. It emerged that: 1) non-grazed grasslands emitted more soil CO2than grazed grasslands over the growing season; 2) the alpine shrub meadow emitted more soil CO2than the alpine meadow; the annual cumulative soil CO2emissions of alpine meadow and alpine shrub meadow were 241.5–326.5 g C/m2and 429.0–512.5 g C/m2, respectively; 3) seasonal patterns were evident with more soil CO2flux in the growing than in the non-growing season; and 4) the diurnal soil CO2flux exhibited a single peak across all sampling sites. In addition, soil CO2flux was correlated positively with soil temperature at 5 cm, but not at the other depths. We concluded that grazing exclusion enhanced soil CO2emission over the growing season, and decreased carbon sequestration of alpine meadow and alpine shrub meadow on the northeastern Tibetan Plateau. Since an increase in soil temperature increased soil CO2flux, global warming could have an effect on soil CO2emission in the future.
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影响因子：
2.6
作者：
L. F. Brito;J. M. Júnior;G. T. Pereira;Z. M. Souza;N. L. S. Júnior
通讯作者：
L. F. Brito;J. M. Júnior;G. T. Pereira;Z. M. Souza;N. L. S. Júnior
影响因子：
2
作者：
Grogan, Paul
通讯作者：
Grogan, Paul
影响因子：
4.7
作者：
Xinlei Gao;B. Thomas;R. Beck;D. Thompson;Mengli Zhao;W. Willms;X. Hao
通讯作者：
Xinlei Gao;B. Thomas;R. Beck;D. Thompson;Mengli Zhao;W. Willms;X. Hao
禁牧对藏北退化高山草甸恢复的影响
DOI：
10.1071/rj14092
发表时间：
2015-03
期刊：
The Rangeland Journal
影响因子：
--
作者：
Wan, Y. F.;Li, Y.;Baima, Y. Z.;Xirao, Z. M.
通讯作者：
Xirao, Z. M.
影响因子：
9.7
作者：
R. Mills;N. Dewhirst;A. Sowerby;B. Emmett;Davey L. Jones
通讯作者：
R. Mills;N. Dewhirst;A. Sowerby;B. Emmett;Davey L. Jones