Ren Yi Wen, Xiao Mou Liang, Yuan Hong Chao, Zhu Zhen Ke, Li Qiao Yun, Ge Ti da, Su Yi Rong, Wu Jin Shui
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China.
Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
Ying Yong Sheng Tai Xue Bao. 2018 May;29(5):1397-1404. doi: 10.13287/j.1001-9332.201805.021.
To examine the allocation of rice photosynthates and its response to the elevated CO (800 μL·L) and N fertilization (100 mg·kg) at both tillering stage and booting stage in plant-soil system, rice was continually labelled with CO. The results showed that the rice root biomass at the tillering stage and the shoot biomass at the booting stage were significantly increased under elevated CO. Elevated CO increased the rice biomass and root-shoot ratio at tillering stage, but reduced it at booting stage. Under elevated CO, N fertilization promoted shoot biomass during rice growth, but significantly decreased the root biomass at booting stage. Elevated CO significantly increased the allocation of assimilated C to the soil at the booting stage. N fertilization did not promote the elevated CO-induced stimulation of assimilated C allocated to the soil, and it even decreased the proportion of assimilated C in the soil. In summary, elevated CO increased the photosynthetic C allocation into soil and promoted the turnover of soil organic carbon in paddy soil. N fertilization enhanced rice shoot biomass but decreased the belowground allocation of photosynthetic C.
为研究在植物-土壤系统中，分蘖期和孕穗期水稻光合产物的分配及其对高浓度CO₂（800 μL·L⁻¹）和施氮（100 mg·kg⁻¹）的响应，用¹⁴CO₂连续标记水稻。结果表明，高浓度CO₂条件下，分蘖期水稻根生物量和孕穗期地上部生物量显著增加。高浓度CO₂增加了分蘖期水稻生物量和根冠比，但降低了孕穗期的根冠比。在高浓度CO₂条件下，施氮促进了水稻生长过程中地上部生物量的增加，但显著降低了孕穗期的根生物量。高浓度CO₂显著增加了孕穗期同化碳向土壤中的分配。施氮并未促进高浓度CO₂诱导的同化碳向土壤中的分配增加，甚至降低了土壤中同化碳的比例。综上所述，高浓度CO₂增加了光合碳向土壤中的分配，促进了稻田土壤有机碳的周转。施氮增加了水稻地上部生物量，但降低了光合碳的地下分配。
