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不同种源栓皮栎光响应曲线的模型拟合及参数比较

邓云鹏1,雷静品1,2*,潘磊3,王晓荣3   

  1. 1中国林业科学研究院林业研究所, 国家林业局林木培育重点实验室, 北京 100091; 2南京林业大学南方现代林业协同创新中心, 南京 210037;3湖北省林业科学研究院, 武汉 430075)
  • 出版日期:2016-02-10 发布日期:2016-02-10

Model fitting of photosynthetic light-response curves in different Quercus variabilis provenances and its parameter comparison.

DENG Yun-peng1, LEI Jing-pin1,2*, PAN Lei3, WANG Xiao-rong3   

  1. (1Research Institute of Forestry, Key Laboratory of Forest Silviculture of the State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China; 2CoInnovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China;3 Hubei Academy of Forestry, Wuhan 470075, China)
  • Online:2016-02-10 Published:2016-02-10

摘要: 利用2年生栓皮栎实生苗,通过直角双曲线模型(RHM)、非直角双曲线模型(NHM)、指数函数(EM)、直角双曲线修正模型(MRHM)和分段函数(SFM)对辽宁庄河(LNZH)、北京平谷(BJPG)、陕西黄龙(SXHL)、河南济源(HNJY)、湖北鹤峰(HBHF)、云南安宁(YNAN)6个种源地栓皮栎的光合光响应曲线进行拟合,对5种模型拟合结果进行比较,分析了6个种源栓皮栎的光合特性,以期提高光合光响应曲线拟合的准确性并对不同种源植物在生境变化情形下的光合生理特征进行探索。研究发现:(1)5个模型中MRHM和SFM优势明显,其拟合结果与观测值更吻合;(2)不同模型拟合对α、PnmaxRd结果影响较大,部分拟合参数在模型间差异显著,如EM和SFM拟合的α和Rd显著低于其他模型(P<0.05),RHM和NHM拟合的Pnmax显著高于其他模型(P<0.05),而且模型选择影响种源试验部分光响应参数结果差异的显著性水平;(3)栓皮栎种源间Pnmax和Rd差异显著(P<0.05),其中SXHL种源Pnmax和HNJY种源Rd显著高于其他种源(P<0.05);(4)通过光响应曲线比较,除LNZH种源外其余暖温带种源2年生幼苗均能很好地适应试验地生境条件。

关键词: 氮沉降, 陆地生态系统, 土壤酶活性, 氮磷添加

Abstract: In order to improve the accuracy of photosynthetic light-response curve model in data fitting and explore the photosynthetic-physiological characteristics of plants from different provenances under changing habitat conditions, photosynthetic characteristics of Quercus variabilis from six provenances were studied. The research materials were twoyear-old seedlings of Q. variabilis from six provenances, i.e., Zhuanghe of Liaoning Province (LNZH), Pinggu of Beijing (BJPG), Huanglong of Shannxi Province (SXHL), Jiyuan of Henan Province (HNJY), Hefeng of Hubei Province (HBHF), and Anning of Yunnan Province (YNAN). Five photosynthetic lightresponse curve models were chosen, i.e., rectangular hyperbolic model (RHM), non-rectangular hyperbolic model (NHM), exponential model (EM), modified rectangular hyperbolic model (MRHM), and subsection function model (SFM). These models were adopted to fit the photosynthetic light-response curve data of six Q. variabilis provenances. The photosynthetic parameters were compared among the five models and the photosynthetic characteristics of the six provenances were analyzed. The results showed that: (1) among the five models, MRHM and SFM had better fitting results in terms of conformity with measured values; (2) different models obviously affected the initial quantum efficiency (α), maximum net photosynthetic rate (Pnmax) and dark respiration rate (Rd). For example, Pnmax and Rd fitted by EM and SFM were significantly lower than those derived from the other models (P<0.05), and Pnmax fitted by RHM and NHM were significantly higher than those obtained by the other models. Besides, the significance of photoresponsive parameters among different provenances varied with the selected models; (3) there were significant differences of Pnmax and Rd among provenances (P<0.05). For instance, Pnmax of SXHL provenance was significantly higher than those of the other provenances (P<0.05), while Rd of HNJY provenance was significantly higher than those of the other provenances (P<0.05); and (4) the warm temperate provenances except LNZH would adapted better to the tested habitat.

Key words: nitrogen and phosphorus addition, terrestrial ecosystem., soil enzyme activity, nitrogen deposition