Carbon dioxide assimilation, photosynthetic efficiency, and respiration of a Chesapeake Bay salt marsh
Carbon dioxide assimilation, photosynthetic efficiency, and respiration of a Chesapeake Bay salt marsh
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DOI：
10.2307/2259676
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发表时间：
1981-07
影响因子：
5.5
通讯作者：
B. Drake;M. Read
中科院分区：
文献类型：
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作者：
B. Drake;M. Read
小结（3）草群落中，5月中旬至6月初，单位绿色生物量的光合效率急剧下降。从 6 月下旬到 9 月下旬，下降仍在继续，但两个社区都是线性且渐进的。 (4)日出至日落期间盐沼单位面积CO2净同化日间最大值为0.95 mol m-2,出现在6月下旬。 6 月、7 月和 8 月期间，两个社区的二氧化碳净同化量占事件 PAR 的 3.5 + 0-9%。使用光合效率季节过程的回归方程和入射太阳辐射模型估算了全季节群落净二氧化碳同化量。该模型预测整个生长季节（5 月至 10 月）的 CO2 同化总量估计值为 62 mol m-2。 6月至8月的光合效率为19%（1.9%），相当于太阳总辐射的0-9%。
SUMMARY (3) In the grass community, photosynthetic efficiency per unit green biomass declined sharply from mid-May until early June. From late June until late September, the decline continued, but was linear and gradual in both communities. (4) The maximum value for day-time net CO2 assimilation per unit area of salt marsh, between sunrise and sunset, was 0.95 mol m-2 and occurred in late June. During June, July, and August, net CO2 assimilation by both communities accounted for 3.5 + 0-9% of the incident PAR. Whole-season community net CO2 assimilation was estimated using a regression equation for the seasonal course of photosynthetic efficiency and a model for incident solar radiation. The estimate of total CO2 assimilation predicted by the model for the entire growing season (May to October) was 62 mol m-2. The photosynthetic efficiency during June to August was 19%o (1.9%) equivalent to 0-9% of total solar radiation.