摘要
多年生黑麦草刈后2 d 内,其再生草各器官中的碳水化合物主要来源于残茬,刈后3 d内,再生器官中的氮素也是主要来源于残茬。刈前根部贮藏的碳水化合物和氮素对再生的贡献小于残茬。刈割3 d 后,根中新吸收的氮素和残茬内新同化的碳水化合物迅速增加,再生器官中,以新同化的碳水化合物和新吸收的氮素占绝对优势。在植株再生中,叶片生长区内刈前贮藏的碳水化合物和氮素下降的程度大于残茬和根部,其中,贮藏的氮素下降持续的时间长于贮藏的碳水化合物。高频率的刈割强烈地干扰了多年生黑麦草的能量贮藏和氮素平衡。
Within 2 days after cutting, the carbohydrate transferred to the regrowth of perennial rye grass mainly comes from the storage contained in the stubble. Also, within 3 days after cutting, the storage in the stubble performs as a main source of nitrogen needed for the regrowth of rye grass. During these 2～3 days, the contribution of carbohydrate and nitrogen from the storage in the root is less than that from the stubble. Beyond 3 days after cutting, however, the amount of nitrogen newly absorbed by the root and the content of carbohydrate assimilated in the stubble increase rapidly, and hence they become the main source of carbohydrate and nitrogen transferred to the re growth. During the re growing period, the contents of carbohydrate and nitrogen stored in the growing zone of the leaf before cutting decrease more significantly than those stored in the stubble and in the root. In respect to this, the decrease in nitrogen content lasts longer than that in stored carbohydrate. The above results indicate that the storage of energy and the balance of nitrogen in perennial rye grass are strongly disturbed by frequent cuttings.
出处
《草业学报》
CSCD
1999年第4期65-70,共6页
Acta Prataculturae Sinica
关键词
黑麦草
刈割
碳水化合物
氮素
perennial rye grass
cutting
regrowth
carbohydrate
nitrogen
