香蕉叶缘干枯与叶片含氟量关系

RELATIONSHIP BETWEEN THE BANANA MARGINAL SCORCH AND THE FLUORIDE CONTENT OF THE BANANA LEAF

对４个地点不同叶位的香蕉叶片和不同枯黄程度的香蕉叶片不同部位的含氟量进行测定，以探讨香蕉叶片含氟量与香蕉叶缘干枯的关系。结果表明，污染区叶片的含氟量显著高于相对清洁区。相对清洁区第１片叶含氟量与其它叶位的叶片含氟量无显著差异，污染区第１片叶与第７、第８片叶的含氟量存在显著差异。正常叶片各部位的含氟量无显著差异，叶缘枯黄的叶片各部位的含氟量存在显著差异，并有由叶中脉向边缘增大的趋势。香蕉不同干枯程度叶片的含氟量都显著高于正常叶片。由于叶片氟的积累，叶片发生不同程度的干枯。

The fluoride content of banana leaves which came from four areas and the bananaleaves of different degrees of withering was determined.The result indicated that thefluoride content of the banana leaves that came from polluted areas was much morethan the content of those coming from clean areas.The fluoride content of the firstand the eighth leaves which came from clean areas was almost similar.Thefluoride content of the first leaf and the eighth leaf which came from polluted area wasvery different.The fluoride content at each spot on the normal leaf was almost identi-cal,whereas the fluoride content at each spot on the withered leaf was very different.The fluoride content showed incremental trend from the middle vein to the edge of aleaf.The fluoride content of the banana leaves of different degrees of withering wasmuch more than that of the normal leaf.Because of the accumulation of fluoride ina leaf,the baana leaf wilted.