A Study on the Seasonal Changes of Phosphorus Content of Six Crops in the Shandianhe River Basin, North China
Jiang Gao-ming, Han Rong-zhuang, Sun Jian-zhong
Chin J Plan Ecolo. 1995, 19 (4):
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The chemical characteristics of phosphorus contents of 15 species in the Shandian River Basin, Heibei Province were measured, and the seasonal changes of phosphorus contents of six crops were studied. The results were as follows: The average phosphorus contents of the 15 species was 1.38±0.62mg · g-1 with the highest, 2.25mg·g-1, and the lowest, 0.88mg· g-1. Such a result was resemble to that investigated in Haihe River Basin and Xilinhe River Basin near the same region (North China). The types of seasonal changes of phosphorus contents of the 6 crops varied with the different kinds of crops. For the Gramineae crops sush as Triticum aestivum and Avena nuda and the oil-bearing crops Linum usitatissimum,the phosphorus contents changed as a series of, mature period growth > seedling period > the vigorous period (P<0.05); For the bean crops like Pisum sativum and Vicia faba, the seedling period > vigorous period > mature period (P<0.001); while for the stem-tuber crops, Solanum tuberosum, the seasonal changes of phosphorus content was the vigorous > seedling period > mature period (P<0.001). The different organic parts showed the different patterns of seasonal phosphorus changes, for roots, stems and leaves of the crops (except for Solanum tuberosum), seedling period > the vigorous period > mature period, while for the fruits, the end of mature period > the fruit-forming period. The ratios of phorphorus content between root and stem, stern and leaf, as well as stem and fruit could indicate the movements of phosphorus in the plants. The results showed that phosphorus moved along the way of root→ stem →leaf during seedling period or the vigorous period, and root →stem →fruit during the fruit mature period.