摘要
在枣棉间作条件下,通过设置不同的棉花种植密度(13.5万、18.0万和22.5万株·hm-2),研究了密度对棉花光合作用及产量的影响。结果表明,间作棉花形态、荧光参数和光合特性受到枣树的显著不利影响,表现出明显的边行负效应。随着枣棉间距离的增加,不利影响减小,SPAD值、光系统II的实际光化学效率(ΦPSII)和净光合速率(Pn)显著增加;随着密度增加,间作棉花LAI和干物质质量显著增加。密度为18万株·hm-2的间作棉花的光系统II的实际光化学效率(ΦPSII)、净光合速率(Pn)、蒸腾速率(Tr)和产量显著高于13.5万株·hm-2和22.5万株·hm-2。在枣棉间作复合系统中,适当增加枣棉间距可以减轻枣树对棉花的不利影响,而较高的棉花密度也有利于棉花高产。
The research was done in the jujube-cotton intercropped systems in 2012 and 2013 in order to investigate the effect of plant density on physiological property and production of cotton. Three densities （1.35×10^5 plants.hm^-2, 1.8×10s plants.hm^2 and 2.25×10^5 plants .hm^-2） characterized by changing plant distance within a row were set up. The results indicated that there was a negative influence of jujube on morphology, fluorescence parameters and photosynthesis characters for intercropping cotton. Two rows of cotton at the border had a significant lower SPAD, actual quantum efficiency ofphotosystem II （ΦPSⅡ） and net pho- tosynthetic rate （Pn） due to being affected seriously by jujube. The LAI and dry matter significantly increased with the plant den- sities. The Cotton with the density at 1.8×10^5 plants .hm^-2 had a higher actual quantum efficiency ofphotosystem II （ΦPSⅡ）, net photosynthetic rate （Pn）, transpiration rate （Tr） and production compared to that of the cotton with the density at 1.35×l0^5 plants, hm^-2 and at 2.25 × l0^5 plants .hm^2. So we conclude that the productivity of cotton in the jujube-cotton intercropping sys- tems can be improved by increasing the distance between cotton and jujube and by optimizing cotton plant density.
出处
《棉花学报》
CSCD
北大核心
2014年第4期334-341,共8页
Cotton Science
基金
农业部公益性行业专项(201003043-01)
关键词
枣棉间作
叶面积指数
光合特性
荧光参数
遮荫
Jujube-cotton intercropping
LAI
photosynthesis characters
fluorescence parameter
shading
