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Chinese Journal of Applied Ecology ›› 1992, Vol. 3 ›› Issue (4): 296-301.

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Internal and external nutrient cyclings ot poplar tree Ⅰ. Changes of nutrient storage in different parts of poplar tree before and after leaf fallen

Shen Shanmin, Yu Wantai, Zhang Lu, Lian Hongzhi   

  1. Institute of Applied Ecology, Academia Sinica, Shenyang 110015
  • Received:1992-01-23 Revised:1992-04-09 Online:1992-10-25 Published:1992-10-25

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Abstract: There are big changes of nutrient storage in different parts of poplar tree before and after leaf fallen in west Liaoning. Foliage is the major nutrient pool for the growing poplar tree. Its Nstorage is about two third of Nin total and Pand Kare more than one third. 60% of Nand 50% of Pin foliage are transferred to other parts of the tree during leaf fallen, with Kcontent almost unchanged and Ca,Mg and Si contents significantly increased.The trunk, branch and root are the reservoirs for N,Pand organic nutrients in winter,their storage of Nand Pis much higher than in sumer,but that of Kand Si is slightly decreased.Ca is almost unchanged and Mg is slightly increased.

Key words: Poplar tree, Nutrient content change