关键词: 海岸防护林(海岸林), 天然更新, 黑松, 间伐

Abstract: In order to understand the effects of fertilizers interaction on the growth of Jerusalem artichoke, a field experiment with orthogonal design was conducted to study the effects of nitrogen (N), phosphorus (P), and their interaction on the tuber yield and its quality of J. artichoke “Nanyu No. 1”. Both N and P had significant effects on the tuber yield, its dry matter content, and total sugar, reducing sugar, and inulin contents (P<0.01). N and P interaction had significant effects on the tuber yield and its dry matter and reducing sugar contents (P<0.05), and extremely significant effects on the tuber’s total sugar and inulin contents (P<0.01). When the P fertilization rate was 135 kg P₂O₅·hm^-2, its interaction with N was positive (synergistic) when the N fertilization rate was less than 180 kg·hm^-2, but negative (antagonistic) when the N fertilization rate was above 180 kg·hm^-2. When the N fertilization rate was 180 kg·hm^-2 and the P fertilization rate was 135 kg P₂O₅·hm^-2, the interactive effect of N and P increased, with the tuber yield and its dry matter, total sugar, reducing sugar, and inulin contents being the highest. Above all, the optimal basis fertilization for J. artichoke in Laizhou City of Shandong Province, East China would be 180 kg·hm^-2 of N and 135 kg·hm^-2 of P₂O₅.