关键词: 南方型杨树, 土壤立地, 施肥效应

Abstract:

A test of the effects of fertilization was done with fertilizing the ordinary N, P, K elements from 1991~1995 in several experimental areas selected from three representative site types of Soil in Jianghan plain, Hubei Province. The results shows: Overall significant effects of single N element; Overall bador not better effects of single P or K element, even a significantly negative effect in wet clay soil of theplain(siteⅠ)which is only suitable for single N element; The best effect of mixed N and P elements in theplain alluvial soil(site Ⅱ)and sedimentary soil in the lake region(site Ⅲ); The best application rate(total): 400kg N/hm² for siteⅠ; (200kg N+100kg P₂O₅)/hm² for site Ⅱ; (100kg N+100kgP₂O₅)/hm²for site Ⅲ; fertilizers are urea for N, calcium superphosphate for P₂O₅, respectively; 35%~75%increment in growing stock, which is equal to increasing 6~11 thousand yuan/hm² in total within five years(1991~1995).

Key words: Southern type of poplar tree, Site type of soil, The effect of fertilization