冬季覆盖作物对双季稻光合特性的影响

Effects of Different Winter Cover Plants on Photosynthetic Characteristics of Double-cropping Rice

以冬闲为对照,研究了黑麦草、紫云英、油菜和马铃薯4种冬季覆盖作物对双季稻的光合特性的影响。结果表明:黑麦草、紫云英和马铃薯3种冬季覆盖作物处理能明显提高双季稻各个生长发育时期叶片的叶面积指数、叶绿素含量和净光合速率,增加稻谷产量,提高生物能及植株茎叶光能利用率、籽粒光能利用率和总光能利用率。

The effects of four different winter cover plants,ryegrass,Chinese milk vetch,rape and potato,on photosynthetic characteristics of double-cropping rice in southern China were studied in experimental field from 2008 to 2009.The results showed that compared with the CK（fallow in winter）,the treatments of ryegrass,Chinese milk vetch and potato increased obviously the LAI,chlorophyll content and net photosynthetic rate in leaves of the double-cropping rice during the whole growth stages,raised the grain yield and increased total bio-energy and the solar energy utilization ratio of stem,leaf and grain of double-cropping rice.