Li Fusheng, Kang Shaozhong, Zhang Fucang
Agricultural College, Guangxi University, Nanning 530005.
Ying Yong Sheng Tai Xue Bao. 2002 Sep;13(9):1169-73.
The effect of atmospheric CO2 and temperature increment on crop growth, photosynthesis, yield, and water and nutrient use efficiency was summarized and discussed in this paper. Under high CO2 concentration in the future, the photosynthetic rate of crops may be enhanced to some extent, and their biomass and yield may also be increased. Their stomatal conductance may be reduced, while water use efficiency (WUE) may be increased under elevated CO2 concentration. The aboveground biomass and root production, especially fine root production, will be greatly enhanced, and consequently, litter production increased, C/N ratios increased, plant litter decomposition rates declined under CO2 enrichment. Plants grown under elevated CO2 concentration may release more substrate into rhizosphere, which may lead to an increased activity of soil microorganisms, acclerated mineralization of nutrients, and improved nutritional status of the plant.
本文总结并讨论了大气二氧化碳浓度升高和温度上升对作物生长、光合作用、产量以及水分和养分利用效率的影响。在未来高二氧化碳浓度条件下，作物的光合速率可能会在一定程度上提高，生物量和产量也可能增加。气孔导度可能降低，而在二氧化碳浓度升高时水分利用效率（WUE）可能提高。地上生物量和根系生长，尤其是细根生长，将得到极大增强，因此，凋落物产量增加，碳氮比升高，在二氧化碳浓度升高条件下植物凋落物分解速率下降。在二氧化碳浓度升高条件下生长的植物可能会向根际释放更多底物，这可能导致土壤微生物活性增加、养分矿化加速以及植物营养状况改善。
