安徽长江滩地杨树人工林生物量和养分积累

安徽长江外滩Ⅰ-69杨树无性系人工林11年林分生物量达到90.2t·hm^-2,平均生产量为8.2t·hm^-2·a^-1,平均单株生产量为21.9kg·a^-1,与相同纬度带一般立地条件林分相比单株生产量高0.7%;另外林分叶面积指数为3.32m²·m^-2,造林后第3年叶面积指数的净增值达到最高,同时林分生产力开始进入最高水平该林分每生产1t干物质需要N 3.369kg、P 0.327kg、K 2.424kg、Ca 7.465kg、Mg 0.2kg、Cu 0.0073kg、Mn0.01868kg、Fe 0.1115kg和Zn 0.00268kg,同时吸收S 0.72kg、Cr 0.000252kg、Cd 0.0O039kg和Pb0.00043kg.年轮中元素含量逐年有波动,N和K呈负相关,而N与P则表现为正相关;滩地的淹水时间对年轮中P含量影响较大,其次是N,与K含量呈负相关,但不显著.

Biomass and nutrient accumulation of poplar plantation on beach land in Yangtse River in Anhui province.

The authors summarized biomass pattern and production of Ⅰ-69 poplar clone plantation on beach land in Anhui province and built mathematical models for biomass with DBH and height as well.Meanwhile the LAI dynamics of the plantation was analyzed.The biomass of 11-year plantation of poplar on beach land was 90.2 t·hm^-2,its production 8.2 t·hm^-2·yr^-1 for plantation and 21.59kg·yr^-1 for single trees.Compared to the plantation at general sites in Jiangsu province,the production for individual on beach land was as 50% as higher.Its LAI was 3.32 m²·m^-2,and the net LAI increasing reached highest level in 3 years after planting.Meanwhile the stand productivity was getting into highest too.To produce one ton biomass,it needed the following materials:N 3.369kg,P 0.327kg,K 2.424kg,Ca 7.465kg,Mg 0.525kg,Cu 0.00573kg,Mn 0.0186kg,Fe 0.111kg,Zn 0.000268kg;and absorbed S 0.72kg,Cr 0.000252kg,Cd 0.00039kg,Pb 0.00043kg.Statistical analysis for element content in annual rings indicated that there was negative relation between N and K,but positive for N and P.The inundation time had significantly positive influence on content of P and N,but negative to K.