不同产区杉木幼林施肥效应及主要影响因子

对不同产区杉木幼林施肥效应研究结果表明 :边缘产区河南信阳杉木幼林施肥当年单施N肥、P肥效果较好 ,NP、PK、NPK肥配施效果好于单施 ;以处理 11(NP2K1)效果最好 ,比对照 (CK)树高、胸径连年生长量分别提高 39%～104%和 54%～136%。一般产区江西分宜杉木幼林施肥对胸 (地 )径生长的影响要大于树高 ;P肥无论是单施还是与其它肥料配施 ,均表现出较好的效果 ,尤其以处理3(P3)效果最为显著 ,4年中杉木幼林胸 (地 )径连年生长量较对照(CK)提高 13%～ 37%。中心产区福建顺昌杉木幼林施肥对树高和胸径生长的影响不如河南信阳和江西分宜 ,施肥虽然表现出一定效果 ,但对杉木幼林生长效应影响效果不稳定 ;施肥第 3年效果好于其它年份 ,以处理 9(P1K1)最好。土壤条件、气候因子、苗木的树高和胸径本底值是影响杉木幼林施肥林木生长效应的主要因子

IMPACT OF FERTILIZATION ON CURRENT ANNUAL INCREMENT(CAI) OF YOUNG CHINESE FIR AND MAIN INFLUENCE FACTORS IN DIFFERENT AREAS

A preliminary study on the impact of fertilization on CAI of young Chinese fir in different areas showed: In Xinyang, Henan Province, the effect of N fertilizer of P fertilizer was better in the first year of fertilization, but the effect of mixed fertilization of NP, KP or NPK was better than that of treatments of only N or P. The optimum one was treatment 11(NP2K1,which leads to an increase of the CAI of tree height and diameter in the breast height by 39%～104% and 54%～136% compared to the control(CK),respectively . In Fenyi, Jiangxi Province, the effect of fertilization on diameter at the breast height was bigger than that on the tree height; the effect of P fertilizer was good whether it was applied mixed with other fertilizers or not. Among all the P treatments the effect of treatment 3(P3) was the most significant one, the CAI of diameter at the breast height of young Chinese fir was increased by 13%～37% within the four year of fertilization experiment. In Shunchang, Fujian Province, the effects of fertilization for young Chinese fir on the tree height and diameter were not so significant like that of the two areas mentioned above, further, this effect was not stable; the effect of fertilization in the third year was bigger that in other years, the treatment 9(P1K1) was the best one. The important factors influencing the impact of fertilization on CAI of young Chinese fir are soil fertility, soil depth, climate and the beginning condition of the nursery stock such as the height and ground?diameter.