Shin Taewhan, Xue Wei, Ko Jonghan
Applied Plant Science, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea.
State Key Laboratory of Grassland Agroecosystems, College of Ecology, Lanzhou University, Lanzhou, 730000, China.
Sci Rep. 2023 Jul 22;13(1):11850. doi: 10.1038/s41598-023-39148-9.
A vegetation canopy chamber system measures gas exchanges in the field between plants and the environment. Transparent closed chambers have generally been used to measure canopy fluxes in the field, depending on solar radiation as the light source for photosynthesis. However, measuring canopy fluxes in nature can be challenging due to fluctuations in solar radiation. Therefore, we constructed a novel transient-state closed-chamber system using light-emitting diodes (LEDs) as a light source to measure canopy-scale fluxes. The water-cooled chamber system used a 1600 Watt LED module to produce constant photosynthetically active radiation (PAR) and a CO gas analyzer for concentration measurements. We used the LED chamber system to measure barley and wheat gas exchanges in the field to quantify CO fluxes along a PAR gradient. This novel technology enables the determination of photosynthesis rates for various crops under diverse environmental conditions, in diverse ecosystems, and across long-term interannual changes, including those due to climate change.
植被冠层箱系统用于测量田间植物与环境之间的气体交换。透明封闭箱通常用于测量田间冠层通量，依靠太阳辐射作为光合作用的光源。然而，由于太阳辐射的波动，在自然环境中测量冠层通量可能具有挑战性。因此，我们构建了一种新型的瞬态封闭箱系统，使用发光二极管（LED）作为光源来测量冠层尺度的通量。水冷箱系统使用一个1600瓦的LED模块来产生恒定的光合有效辐射（PAR），并使用一个CO气体分析仪进行浓度测量。我们使用LED箱系统测量田间大麦和小麦的气体交换，以量化沿PAR梯度的CO通量。这项新技术能够确定各种作物在不同环境条件下、不同生态系统中以及长期年际变化（包括气候变化引起的变化）下的光合作用速率。
