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Characterizing CO_2 fluxes for growing and non-growing season. in a shrub ecosystem on the Qinghai-Tibet Plateau

Science China Earth Sciences 2005年第Z1期48卷 133-140页

作者： XU Shixiao, ZHAO Xinquan, FU Yuling, ZHAO Liang, LI Yingnian, CAO Guangmin, GU Song, WANG Qinxue & DU Mingyuan Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Graduate School of the Chinese Academy of Sciences, Beijing 100136, China National Institute for Environmental Studies, Tsukuba 305-8569, Japan National Institute for Agro-Environmental Science, Tsukuba 305-8604, Japan Northwest Institute of Plateau Biology Chinese Academy of Sciences Xining 810001 China Graduate School of the Chinese Academy of Sciences Beijing 100136 China Northwest Institute of Plateau Biology Chinese Academy of Sciences Xining 810001 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China National Institute for Environmental Studies Tsukuba 305-8569 Japan National Institute for Agro-Environmental Science Tsukuba 305-8604 Japan

To assess carbon budget for shrub ecosystems on the Qinghai-Tibet Plateau, CO2flux was measured with an open-path eddy covariance system for an alpine shrub ecosystem during growing and non-growing season.. CO2 flux dynamics was distinct between the two season.. During the growing season.from May to September, the ecosystem exhibited net CO2uptake from 08:00 to 19:00 (Beijing Standard Time), but net CO2 emission from 19:00 to 08:*** CO2 uptake appeared around 12:00 with values of 0.71, 1.19, 1.46 and 0.67 g CO2m-2 h-1 for June, July, August and September, respectively. Diurnal fluctuation of CO2 flux showed higher correlation with photosynthetic photon flux density than temperature. The maximum net CO2 influx occurred in August with a value of 247 g CO2 m-2. The total CO2 uptake by the ecosystem was up to 583 g CO2 m-2 for the growing season. During the non-growing season.from January to April and from October to December, CO2 flux showed small fluctuation with the largest net CO2 efflux of 0.30 g CO2 m-2 h-1 in April. The diurnal CO2 flux was close to zero during most time of the day, but showed a small net CO2 efflux from 11:00 to 18:00. Diurnal CO2 flux, is significantly correlated to diurnal temperature in the non-growing season. The maximum monthly net CO2 efflux appeared in April, with a value of 105 g CO2 m-2. The total net CO2 efflux for the whole non-growing season.was 356 g CO2 m-2.

关键词： alpine shrub ecosystem, CO2 flux, carbon dynamics, growing season. non-growing season.

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Development of High Yielding Aromatic Rice Variety BRRI dhan70 for Wet season.of Bangladesh

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Journal of Life Sciences 2018年第5期12卷 203-213页

作者： Md. Abdul Kader Tamal Lata Aditya Ratna Rani Majumder Tapas Kumer Hore Al Amin Plant Breeding Division Bangladesh Rice Research InstituteGazipur 1701Bangladesh

BRRI dhan70 is a new aromatic, high yielding and extra-long slender grain containing transplanted Aman rice variety which is an improvement over existing premium quality rice BRRI dhan37. BRRI dhan70 has pleasingly passed in the proposed variety trial conducted in the farmers’ field. As a result National Seed Board (NSB) approved this variety for commercial cultivation in the wet season.(T. Aman) of Bangladesh in 2015. The important feature of BRRI dhan70 is the straw colored extra-long slender, higher elongation ability and aroma of the cooked rice. The growth duration of BRRI dhan70 is 130 days which is 10-15 days earlier growth duration than BRRI dhan37. Thousand grain weight of the variety is 20 gm and it has colored grain tip and pointed awn. The rice has 21.7% amylose content with 9.5% protein content. The special character of the variety is lodging tolerance. It has long, erect deep green flag leaf. BRRI dhan70 can produce 4.8-5.0 t/ha yield with proper management which is approximately 1.0-1.35 t/ha higher yield than BRRI dhan37. The exportable aromatic rice BRRI dhan70 is an excellent variety for cultivating in the wet (T. Aman) season.and farmers can be benefited by the cultivation of BRRI dhan70.

关键词： Rice extra-long-slender aromatic exportable BRRI dhan70 wet season.

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