【作者】 曾志杰； 杨盛昌；

【Author】 ZENG Zhi-jie, Yang Sheng-chang(Xiamen Research Institute of Agricultural Science, Xiamen, Fujian 361009; School of Life science, Xiamen University, Xiamen, Fujian 361005)

【机构】 厦门市农业科学研究所； 厦门大学生命科学学院；

【摘要】 在田间栽培条件下,利用CIRAS-17型便携式光合测定系统研究不同钾素水平的施肥量(复合肥)对甜瓜光合特性的影响。结果表明:适量增施钾素能提高甜瓜叶片的含水量、含钾量及可溶性蛋白含量,并相应提高蒸腾速率(Tr)、气孔导度(Gs)值,降低细胞间隙中CO2浓度(Ci)值,提高其光合效率。净光合速率(Pn)对光响应曲线表明:光饱和点和补偿点分别为1100mol/(m2·s)和37.8 mol/(m2·s),表现量子效率为0.0114。在本试验范围内,田间最适施钾量(K2O)为216kg/hm2。更多还原

【Abstract】 Under the field condition, diurnal variations of the photosynthetic characteristics was measured and studied on various amounts of potassium (mixed fertilizers) applied at Muskmelon by portable photosynthesis systems CIRAS-17.The results indicated: improved suit potassium that it can increased water content, potassium content, soluble protein content in Muskmelon leaf, and increased transpiration rate (Tr), stomatal conductance (Gs) , decreased intracellular concentration of CO2 (Ci), increased it’s net photosynthetic rate (Pn). The response curve of Pn to light intensity (PFD) showed that the light saturation point is 1100 mol/(m2·s) , the light compensation point is 37.8mol/(m2·s), apparent quantity yields 0.0114μmol mol/(m2·s). The optimum application rates (mixed fertilizers) is 216 kg/hm2 in this test .更多还原