干热河谷象草光合特性研究  

Study on Photosynthetic Characteristics of Pennisetum purpureum Schumach in Dry-hot Valley

作　　者：冯光恒[1] 杨艳鲜[2] 江功武[1] 陈虎[1] 徐兴才[1] 杨红钧[3] 

机构地区：[1]云南省农业科学院,云南昆明650201 [2]云南省农业科学院农业环境资源研究所,云南昆明650201 [3]云南省农业科学院农业经济与信息研究所,云南昆明650201

出　　处：《西南农业学报》2014年第1期99-103,共5页Southwest China Journal of Agricultural Sciences

基　　金："十二五"国家支撑项目(2011BAC09805);云南省攻关项目(2011CA009)

摘　　要：通过对元谋干热河谷生态农业模式中套种的象草光合特性相关因子进行了测定和分析,结果表明,旱季,受干旱胁迫和光抑制作用,象草Pn、Gs日进程呈双峰型走势,发生"午休"现象,Tr日进程呈单峰型走势;雨季,Pn、Gs、Tr日进程呈单峰型走势;象草为阳性耐荫C4植物,能在弱光环境下充分利用光能,有较强的CO2同化能力。总体上,象草对干热河谷气候环境有较好的适应性和抗旱性,适时在林内套种,能发挥良好的生态位功能和较高的生产力水平。The photosynthesis characteristics of Permisetum purpureum Schumach, which was planted in file dry-hot valley by eco-agricultural models in Yuanmou, were analyzed. The results showed that the diurnal courses of Pn and Gs were bimedal pattern trend, and took place plant ）unch break phenomenon by drought stress and light inhibiting effect, and the diurnal course of Tr was unimodal pattern/rend in the dry season, and the diurnal course ofPn ,Gs and Tr is unimedal pattern trend in the rainy season. Pennisetumpurpureum Schumach is a helioph- ilous and shade-tolerant C4 plant, which can fully use the light energy under the weak light environment and has strong CO2 assimilation ca- pacity. Generally, Pennisetum purpureum Schumach showed a relatively good adaptability and drought resistance in the dry-hot valley envi- ronment. To interplant Penn/satan purpureum Schumach timely in the forest can be helpful to the niche function and improve the productivity.

关 键 词：象草 光合特性 干热河谷 

分 类 号：S543.9[农业科学—作物学]