摘要
在16年生玉露香梨树高光效开心树形果园进行了间伐试验,测定并比较了间伐与未间伐果园梨树树体南、北侧叶片的光合作用参数,通过Pn-PAR响应曲线和Pn-CO_2响应曲线,得出相应的拟合参数。结果表明,与未间伐果园相比,成龄梨园间伐后梨树树体南、北侧叶片的最大净光合速率分别达到23.40,21.36μmol/(m^2·s),分别是未间伐果园的1.4,1.5倍。玉露香梨光合作用的光补偿点在20~36μmol/(m^2·s),同一方位结果相近,北侧高于南侧;光饱和点在1 056~1 516μmol/(m^2·s),表现为间伐南>间伐北>未间伐南>未间伐北,说明间伐果园梨树对光强的利用范围宽、效率高;CO2补偿点表现为间伐南<未间伐南、间伐北<未间伐北,说明间伐果园梨树利用CO_2的范围比未间伐宽,利用CO_2的能力更强。总体上说明间伐能提高玉露香梨叶片的光合作用能力。
Open-center training system had been carried out at tree-thinning 16 years old Yuluxiang pear orchard of high light efficiency, and the response curves of photosynthetic parameters, along with the fitting parameters of Pn-PAR, Pn-CO2 response curves,were determined and compared in pear leaves of south and north parts between the tree-thinning and non-tree-thinning orchard. The results showed that when compared with the non-tree-thinning, leaves in south and north parts of pear trees in tree-thinning orchard had the higher maximum net photosynthetic rate, which was 23.4,21.36 μmol/（m2·s）, and was 1.4, 1.5 times as the non-tree-thinning orchard. The light compensation point of the species was between 20-36 μmol/（m2·s）, the value of same side was close, and north was higher than south. The light saturation point was between 1 056-1 516 μmol/（m2·s）, tree-thinning-south〉tree-thinning-north〉non-tree-thinning-south〉non-tree-thinning-north. Tree-thinning orchard had a wide range of the light intensity of the use, high light utilization efficiency. The CO2 compensation point was tree-thinning-south 〈non-tree-thinning-south,tree-thinning-north 〈non-tree-thinning-north. It was to say that the range of the CO2 of the use of tree-thinning orchard was wider than non-tree-thinning orchard, the ability was stronger. The results showed that tree-thinning could enhance photosynthesis ability of Yuluxiang pear leaves.
出处
《山西农业科学》
2016年第6期737-740,共4页
Journal of Shanxi Agricultural Sciences
基金
国家科技支撑计划项目(2014BAD16B00)
关键词
玉露香
间伐
净光合速率
Yuluxiang
tree-thinning
net photosynthetic rate
