Ecosystem metabolism along a colonization gradient of eelgrass (Zostera marina) measured by eddy correlation
Ecosystem metabolism along a colonization gradient of eelgrass (Zostera marina) measured by eddy correlation
复制标题
通过涡流相关测量沿着大叶藻（Zostera marina）定植梯度的生态系统代谢
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
K. McGlathery
中科院分区：
文献类型：
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作者：
J. Rheuban;P. Berg;K. McGlathery
弗吉尼亚州沿海海湾经历了局部灭绝的大叶藻（Zostera码头）在20世纪30年代初，恢复开始于2001年产生了一个生态系统的状态变化，从裸露的植被沉积物。氧通量的季节性测量使用涡动相关技术在三个网站代表不同阶段的海草殖民化：无植被（裸），5年，11年播种以来。得出的季节性生态系统呼吸（R）和总初级生产力（GPP）分别增加了10倍和25倍，与草甸年龄。虽然每小时的氧（O2）通量与光在植被的网站高度相关，没有可识别的趋势与光在裸露的网站。随着季节温度分别从12.3°C增加到27.9°C和9.3°C增加到30.5°C，在5年和11年的海草站点，O2产生和呼吸平衡的光补偿点分别从46 µmol光子m − 2 s −1增加到257 µ mol光子m − 2 s−1和63 µmol光子m−2 s−1增加到472 µmol光子m−2 s − 1。这表明，更多的光，从而更多的O2生产，需要抵消增加呼吸与温度和草甸年龄。利用全季每小时O2通量的光合-辐照曲线估算了全年净生态系统代谢（NEM）。裸露、5年和11年站点的年NEM率分别为−7.6、8.6和−7.0 mol O2 m−2 yr−1。虽然该系统经历了一段时期的净自养在早期阶段的殖民化，从无植被的沉积物，密集的海草草甸的生态系统状态变化的GPP和R的幅度改变，但不是系统的整体代谢平衡。
The Virginia coastal bays experienced local extinction of eelgrass (Zostera marina) during the early 1930s, and restoration beginning in 2001 has generated an ecosystem state change from bare to vegetated sediments. Oxygen fluxes were measured seasonally using the eddy correlation technique at three sites representing different stages of seagrass colonization: unvegetated (bare), 5 yr, and 11 yr since seeding. Derived seasonal ecosystem respiration (R) and gross primary production (GPP) increased up to 10‐fold and 25‐fold, respectively, with meadow age. Although hourly oxygen (O2) fluxes were highly correlated with light at the vegetated sites, no identifiable trends with light were observed at the bare site. The light compensation point where O2 production and respiration are in balance increased from 46 µmol photons m−2 s−1 to 257 µmol photons m−2 s−1 and 63 µmol photons m−2 s−1 to 472 µmol photons m−2 s−1 at the 5 yr and 11 yr seagrass sites, respectively, with increasing seasonal temperatures from 12.3°C to 27.9°C and 9.3°C to 30.5°C, respectively. This suggests that more light, and thus more O2 production, is required to offset increasing respiration with both temperature and meadow age. Photosynthesis—irradiance curves generated from hourly O2 fluxes throughout the seasons were used to estimate annual net ecosystem metabolism (NEM). Annual NEM rates at the bare, 5 yr, and 11 yr sites were −7.6, 8.6, and −7.0 mol O2 m−2 yr−1, respectively. Although the system went through a period of net autotrophy during early stages of colonization, the ecosystem state change from unvegetated sediments to dense seagrass meadows changed the magnitude of both GPP and R, but not the overall metabolic balance of the system.
影响因子：
2.5
作者：
Glud, Ronnie N.;Berg, Peter;Rysgaard, Soren
通讯作者：
Rysgaard, Soren