Changes in grassland ecosystem function due to extreme rainfall events: implications for responses to climate change
Changes in grassland ecosystem function due to extreme rainfall events: implications for responses to climate change
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DOI：
10.1111/j.1365-2486.2008.01605.x
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发表时间：
2008-07-01
影响因子：
11.6
通讯作者：
Harper, Christopher W.
中科院分区：
文献类型：
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作者：
Fay, Philipa A.;Kaufman, Dawn M.;Harper, Christopher W.
气候变化正在导致降雨模式的可测量变化，并可能导致极端降雨事件的增加，对生态系统功能和碳循环的关键过程产生不确定的影响。我们研究了降雨总量(Q)、降雨事件间隔(I)和单次事件大小(S-E)的变化对土壤含水量(SWC)和生态系统功能的三个方面：叶片光合碳增益(A(CO_2))、地上净第一性生产力(ANPP)和土壤呼吸(J(CO_2))的影响。我们利用了雨棚覆盖的中温带(2.6m(3))，其中包含了高草、草原草和杂草的组合。用16个I×Q处理组合手工浇水，使用4到53 mm的事件大小。Q增加250%(400-1000 mm yr(-1))增加了平均土壤水分和所有三个过程，但只增加了20%-55%(P
Climate change is causing measurable changes in rainfall patterns, and will likely cause increases in extreme rainfall events, with uncertain implications for key processes in ecosystem function and carbon cycling. We examined how variation in rainfall total quantity (Q), the interval between rainfall events (I), and individual event size (S-E) affected soil water content (SWC) and three aspects of ecosystem function: leaf photosynthetic carbon gain (A(CO2)), aboveground net primary productivity (ANPP), and soil respiration (J(CO2)). We utilized rainout shelter-covered mesocosms (2.6 m(3)) containing assemblages of tallgrass prairie grasses and forbs. These were hand watered with 16 I x Q treatment combinations, using event sizes from 4 to 53 mm. Increasing Q by 250% (400-1000 mm yr(-1)) increased mean soil moisture and all three processes as expected, but only by 20-55% (P