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Bionic Photovoltaic Panels Bio-Inspired by green leaves

Journal of Bionic Engineering 2010年第3期7卷 284-293页

作者： MatthiasZhr Dennis Friedrich Tania Y.Kloth Gerhard Goldmann Helmut Tributsch Technische Fachhochschule Berlin Helmholtz-Zentrum

In strong solar light, silicon solar panels can heat up by 70℃ and, thereby, loose approximately one third of their efficiencyfor electricity generation. Leaf structures of plants on the other hand, have developed a series of technological adaptations,which allow them to limit their temperature to 40-45℃ in full sunlight, even if water evaporation is suppressed. This is accomplishedby several strategies such as limitation of leaf size, optimization of aerodynamics in wind, limitation of absorbedsolar energy only to the useful fraction of radiation and by efficient thermal emission. Optical and infrared thermographicmeasurements under a solar simulator and in a streaming channel were used to investigate the corresponding properties of leavesand to identify suitable bionic model systems. Experiments started with the serrated structure of ordinary green leaves distributedover typical twig structures and finally identified the Australian palm tree Licuala ramsayi as a more useful bionic model. Itcombines a large area for solar energy harvesting with optimized aerodynamic properties for cooling and is able to restructureitself as a protection against strong winds. The bionic models, which were constructed and built, are analyzed and discussed.

关键词： bionics photovoltaic panel green leaves heat control Licuala ramsayi

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Nutrients of green and senesced leaves of a Robinia pseudoacacia plantation along a latitudinal gradient on the Loess Plateau,China

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Journal of Forestry Research 2021年第6期32卷 2499-2506页

作者： Quanchao Zeng Yang Liu Jiajia Yang Yanan Chen Lusha Ma Shaoshan An College of Resources and Environment Huazhong Agricultural UniversityWuhan430070People’s Republic of China State Key Laboratory of Soil Erosion and Dryland Farming On the Loess Plateau Northwest A&F UniversityYangling712100ShaanxiPeople’s Republic of China

Plantations have been widely established to improve ecosystem services and functioning.Black locust,Robinia pseudoacacia L.is a common,widely planted species to control soil erosion on the Loess Plateau.Previous studies have focused on economic values but the interactions between soil and plant carbon(C),nitrogen(N)and phosphorus(P)remain unknown.Investigating variations of soil,green and senesced leaf C,N and P levels in R.pseudoacacia along a latitudinal gradient is useful to understanding its ecological functions.The results show that soil C,N and senesced leaf N and P significantly decreased with an increase in latitude,but there were no significant changes in the senesced leaf C and soil P.The resorption efficiency of N was related with latitude and soil N levels,and the relation between green leaf N and soil N was significant.These relations suggest that soil N was the key in affecting green leaf N levels.At higher latitudes,senesced leaves had lower N levels associated with higher N resorption efficiency to maintain a stable N content in green leaves.With a decrease of soil N,R.pseudoacacia can enhance N resorption efficiency to meet the demand of growth.Thus,it is an important species for reforestation,especially in nutrient-poor environments.

关键词： green leaves Senesced leaves Resorption efficiency Robinia pseudoacacia Loess plateau Vegetation restoration

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