隔根对玉米||花生间作光合特性与间作优势的影响

焦念元1, 2,*,**, 李亚辉1,*, 刘领1, 齐付国1, 尹飞1, 宁堂原2, 李增嘉2, 付国占1
1河南科技大学农学院, 河南洛阳471003; 2山东农业大学农学院/作物生物学国家重点实验室, 山东泰安 271018

通信作者:焦念元;E-mail: jiaony1@163.com

摘 要:

通过隔根消除玉米||花生间作地下种间作用, 研究了地上、地下种间作用对玉米||花生间作优势和功能叶片光合特性的影响, 分析了地上、地下种间效应的贡献。结果表明, 与不隔根相比, 隔根间作体系的土地当量比(LER)降低10.34%~12.30%, 地上、地下种间作用的贡献率分别为24.62%~33.49%和66.51%~75.38%。与不隔根相比, 隔根间作玉米的净光合速率(Pn)、光饱和点(LSP)、光饱和时最大净光合速率(LSPn)、羧化效率(CE)、Rubisco最大羧化速率(Vcmax)、最大电子传递速率(Jmax)和磷酸丙糖利用速率(TPU)明显降低, 隔根间作花生的Pn、光系统II的实际光化学效率(ΦPSII)、表观量子效率(AQY)、LCPLSPLSPn也明显降低; 地上、地下种间作用对间作玉米PnLSPLSPnCEVcmaxJmaxTPU的贡献为正效应, 对间作花生ΦPSIIAQY的贡献为正效应, 地下种间作用对间作花生PnLCPLSPLSPn的贡献为正效应, 地下种间作用则为负效应。可见, 玉米||花生间作优势来源于地上、地下种间作用, 对间作玉米贡献均为正效应, 对间作花生地上为负效应, 地下为正效应。

关键词:玉米||花生间作; 隔根; 种间作用; 光合特性; 间作优势

收稿:2016-03-14   修定:2016-05-09

资助:国家自然科学基金(U1404315和31200332)和河南科技大学创新能力培育基金(2012ZCX020)。

Effects of root barrier on photosynthetic characteristics and intercropping advantage of maize||peanut intercropping

JIAO Nian-Yuan1,2,*,**, LI Ya-Hui1,*, LIU Ling1, QI Fu-Guo1, YIN Fei1, NING Tang-Yuan2, LI Zeng-Jia2, FU Guo-Zhan1
1College of Agronomy, Henan University of Science and Technology, Luoyang, Henan 471003, China; 2College of Agronomy, Shandong Agricultural University/State Key Laboratory of Crop Biology, Tai’an, Shandong 271018, China

Corresponding author: JIAO Nian-Yuan; E-mail: jiaony1@163.com

Abstract:

The effects of above-ground and below-ground interspecific interaction on maize‖peanut intercropping advantage and photosynthetic characteristics of functional leaves were studied, and contribution of aboveground and below-ground to them were analysed by a field experiment with root barrier. Results showed that the land equivalent ratios (LER) of root barrier was lower than that of no root barrier by 10.34%–12.30%, the contribution of above-ground and above-ground interspecific interaction to LER were 24.62%–33.49% and 66.51%–75.38% in maize||peanut intercropping system, respectively. Compared with no root barrier, the net photosynthetic rate (Pn), light saturation point (LSP), maximum net photosynthetic rate of light saturation point (LSPn), carboxylation efficiency (CE), Rubisco maximum carboxylation rate (Vcmax), maximum electron transfer rate (Jmax) and triose phosphate utilization rate (TPU) of intercropped maize were obviously reduced by root barrier, the actual photochemical efficiency of photosystem II (ΦPSII), LCP, LSP and LSPn of intercropped peanut were obviously reduced too by root barrier. The contribution of above-ground and below-ground interspecific interaction to Pn, LSP, LSPn, CE, Vcmax, Jmax and TPU of intercropped maize were positive effects, and to ΦPSII and AQY of intercropped peanut were positive effects. The contribution of below-ground interspecific interaction to Pn, LCP, LSP and LSPn of intercropped peanut were positive effects, but the above-ground were negative effects. In summary, maize||peanut intercropping advantage came from above-ground and below-ground interspecific interaction, and the contribution to intercropping maize were positive effects. The contribution of above-ground interspecific interaction to intercropped peanut were negative effects, below-ground interspecific interaction were positive effects.

Key words: maize||penaut intercropping; root barrier; interspecific interaction; photosynthetic characteristics; intercropping advantage

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