摘要
通过单施、配施和同施氮、磷、钾肥,研究了不同施肥方式下,茶园春、夏、秋季茶树一芽二叶新梢的氮、磷、钾含量及新梢叶片光合生理的变化,并通过逐步回归分析建立了春、夏、秋季茶树叶片净光合速率(Pn)的回归方程.结果表明:不同施肥方式对茶树春、夏、秋季新梢的氮、磷、钾含量影响较大.相同施肥方式下,夏、秋季茶树新梢的氮、磷含量低于春季,而钾含量高于春季.氮磷钾肥同施有利于春季茶树叶片Pn的提高,而单施磷肥对其产生抑制作用,单施氮肥可显著提高夏、秋季茶树叶片Pn;相同施肥方式下,夏、秋季茶树叶片Pn要高于春季.气孔导度(gs)、蒸腾速率(Tr)与夏、秋季茶树Pn呈极显著正相关.逐步回归方程及相关分析表明,季节不同,影响茶树叶片Pn的主要生理因子不同,其共同影响因子是胞间CO2浓度(Ci)和磷含量,其中Ci对茶树Pn有一定的抑制作用,而磷对其有一定的促进作用.
The variety of the contents of N, P, K and photo-biological characters in a bud and two leaves tea tree new shoots were determined to investigate the effects of different fertilization ways, i.e. single or combined N, P, K fertilizer. The regression equations of net photosynthetic rate （Pn） of tea tree in spring, summer and autumn were set up by stepwise regression analysis. The re- sults showed that fertilization ways significantly affected the contents of N, P, K in new shoot. In the same fertilization ways, the contents of N, P in the new shoot was less in summer and autumn than in spring, but the content of K was in contrast. Combined application of N, P and K fertilizer improved Pn of the tea trees in spring. Single application of P fertilizer inhibited the Pn of the tea trees in summer and autumn, while single application of N fertilizer Significantly improved it. In the same fertilization ways, the Pn of the tea trees in summer and autumn was higher than in spring. The stomatal conductance （gs） and transpiration rate （Tr） had positive correlations to Pn in sum- mer and autumn. Regression and correlation analysis showed that the physiological factors affecting P. of the tea trees varied with seasons, and the common factors were the Ci and the content of P. Ci had some subduction to Pn, and it was improved by the content of phosphorus.
出处
《应用生态学报》
CAS
CSCD
北大核心
2014年第12期3499-3506,共8页
Chinese Journal of Applied Ecology
基金
国家茶叶产业技术体系项目(CARS-23)资助
关键词
氮磷钾肥
氮磷钾营养
光合生理指标
新梢
茶树
nitrogen, phosphorus and potassium fertilizer
nitrogen, phosphorus and potassium nu- trition
photo-biological characters
new shoots
tea tree.
