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封焕英,范少辉,苏文会,杜满义,刘广路,毛超.不同经营方式下毛竹光合特性分异研究.生态学报,2017,37(7):2307~2314 本文二维码信息
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不同经营方式下毛竹光合特性分异研究
Photosynthetic characteristics of Phyllostachys edulis under different management modes
投稿时间:2015-12-01  修订日期:2016-07-11
DOI: 10.5846/stxb201512012407
关键词粗放经营  集约经营  光合特性  净光合能力  叶面积指数  叶绿素含量
Key Wordsextensive management  intensive management  photosynthesis  net photosynthetic capacity  leaf area index  chlorophyll content
基金项目基本科研业务费项目(1632014011);国家林业局948项目(2014-4-58);华林中心主任基金项目(ECFNC2014-06)
作者单位E-mail
封焕英 中国林业科学研究院华北林业实验中心, 北京 102300;国际竹藤中心 竹藤科学与技术重点实验室, 北京 100102  
范少辉 国际竹藤中心 竹藤科学与技术重点实验室, 北京 100102 fansh@icbr.ac.cn 
苏文会 国际竹藤中心 竹藤科学与技术重点实验室, 北京 100102  
杜满义 中国林业科学研究院华北林业实验中心, 北京 102300;国际竹藤中心 竹藤科学与技术重点实验室, 北京 100102  
刘广路 国际竹藤中心 竹藤科学与技术重点实验室, 北京 100102  
毛超 国际竹藤中心 竹藤科学与技术重点实验室, 北京 100102  
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摘要:
林木经营方式与林内光照、温度、水分及养分格局关系密切,影响到植株的光合水平。为探明毛竹对不同经营方式的光合响应特性,以安徽省黄山区3种经营方式下的5类毛竹林为对象开展研究,即:粗放经营(Ⅰ)、一般经营(Ⅱ)和集约经营(Ⅲ-挖冬笋量10%-15%,、Ⅳ-挖冬笋量15%-20%、Ⅴ-挖冬笋量约10%,每年9月施氮肥)。结果表明:1)不同经营方式下毛竹的叶面积指数(LAI)和SPAD值间存在显著差异,随经营程度的增加,LAI和SPAD值波动增大。2)光响应曲线变化趋势基本一致,非直角双曲线拟合良好,方程决定系数均大于0.96,随光合有效辐射(PAR)增强,净光合速率(Pn)、气孔导度(Cd)、蒸腾速率(Tr)、胞间二氧化碳浓度(Ci)随之降低,非集约经营(Ⅰ、Ⅱ)的总体变化水平高于集约经营下的Ⅳ和Ⅲ,但集约经营下的Ⅴ则与Ⅰ、Ⅱ趋势更接近,说明适当补充养分(Ⅴ)的集约经营能有效提高毛竹对光能的利用能力。3)光饱和点(LSP)、光补偿点(LCP)和暗呼吸速率(Rd)3个参数均最大或最小的两种经营方式下,毛竹林具较高的适应性,表现为最大净光合能力(Pnmax)显著高于其它经营方式毛竹林,由此推断,粗放经营(Ⅰ)或有效补充林地养分的集约经营(Ⅴ)的毛竹具有较高的光合能力。
Abstract:
Forest management modes closely relate to the available light in a forest, its temperature, moisture, and nutrient status, which all influence photosynthesis. To investigate how photosynthetic characteristics respond to different management modes, we studied five bamboo forest types in Anhui Province, including one type extensively managed (Ⅰ) scarce any human disturbance, one type moderately managed (Ⅱ) some human cutting planless and three types intensively managed, which were amount of shoot dug 10%-15% (Ⅲ), amount of shoot dug 15%-20% (Ⅳ) and amount of shoot dug less 10% with fertilizering every September (Ⅴ). The results showed that 1) there was a significant difference between leaf area index (LAI) and soil and plant analyzer development (SPAD). Moreover, the variability of LAI and SPAD values increased with increasing intensity of management. 2) The variation in light-response curves was similar under different management modes. In addition, a non-rectangular hyperbola was the best model for fitting the light-response curve data, with correlation coefficients greater than 0.96. Furthermore, with increasing photosynthetically active radiation (PAR), net photosynthetic rate (Pn), stomatal conductance (Cd), and transpiration rate (Tr) increased, but intercellular CO2 concentration (Ci) decreased. Photosynthetic characteristics had higher values in forests under non-intensive management (mode Ⅰ and Ⅱ) than in forests with intensive management (mode Ⅳ and Ⅲ). However, photosynthetic characteristics of other forests with intensive management (mode Ⅴ) showed a similar tendency to those observed in mode Ⅰ and Ⅱ. This suggests that intensive management with appropriate nutrient addition can effectively improve the light use efficiency of bamboo forests. 3) Bamboo forests had a more adaptable and higher maximum photosynthetic capacity under management modes that resulted in maximum or minimum value combinations of light saturation point (LSP), light compensation point (LCP) and dark respiration rate (Rd). Therefore, we conclude that non-intensive forest management (mode Ⅰ) and intensive management that includes nutrient addition (mode Ⅴ) are the best management modes for generating bamboo forests with a high photosynthetic capacity.
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