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Nutrition and Growth of Leaves at Different Leaf Ages in Tetraploid Robinia pseudoacacia

四倍体刺槐不同叶龄叶片的营养及叶形变化


摘 要: 为了探索四倍体刺槐叶片不同叶龄的营养价值、叶层生物量、叶绿素含量和叶形生长发育的变化规律以及它们相互之间的关系,从叶片开始生长每隔10 d对四倍体刺槐1个叶龄期叶片进行叶形测量并采样进行叶绿素和营养分析。结果表明: 四倍体刺槐叶片的营养价值在45 d叶龄前较好,相同叶龄叶片的营养价值是生长中期高于生长末期; 35~45 d叶龄的叶层生物量达到了最高; 幼嫩叶片的叶绿素含量低,随着叶龄的增长,叶绿素含量不断增加,达到高峰,随后叶子衰老,叶绿素含量下降; 相同叶龄不同生长时期叶片的叶绿素a、叶绿素b及总叶绿素含量也存在差异; 叶片形状在20 d叶龄前生长迅速,其后生长缓慢; 叶龄与叶片粗脂肪、粗灰分、钙含量、叶长和叶面积(长×宽)呈正相关; 相同叶龄叶片的粗蛋白和磷含量与不同生长时期呈负相关。

Abstract: This study was conducted to assess the impact of leaf age on nutrition,biomass of leaf layer,content of chlorophyll and variety of leaf shape in tetraploid Robinia pseudoacacia. At an interval of 10 d from budbreak the leaf shape, and chlorophyll and nutrients in leaves were measured. The results showed that the leaf nutrition value was at the best level during the first 45 days,and for the same aged leaves,higher during the growing period than the decaying stage. In addition,the biomass of 35~45 d leaf layer reached the highest level. The results also indicated that young leaves contained low content of chlorophyll,which increased gradually to higher levels during the leaf developing stages until it climbed up to the climax. It then decreased with the leaf senility. As for the leaves of the same age,their chlorophyll a,chlorophyll b and the total chlorophyll contents differed in various growth stages. The leaf shape changed rapidly during the first 20 d and then kept a slow pace in developing. The statistics further revealed positive correlations between leaf age and the contents such as ether extract,ash,calcium,as well as leaf length and leaf area (length×width); while the contents of crude protein and phosphor of the same aged leaves demonstrated negative correlations with different growing stages.


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