长江滩地I-72杨人工林生物量和生产力研究
A Study on Biomass and Productivity of Populus×euramericana cv. 'San Martino' (I-72/58) Plantation on Beach Land of Yangtze River
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摘要: 应用典型样地调查法和相对生长法,测定了长江滩地4种密度14年生I - 72杨人工林的生物量与生产力。发现在密度250～370株·hm-2的范围内, I - 72杨林分生物量从102. 40 t·hm-2增加到147. 20 t·hm-2 ,生产力从7.31 t·hm-2 ·a- 1增加到10. 52 t·hm-2·a-1。在所调查的林分中,地上部分生物量占总生物量的90% ,其中干54%、枝28%、皮7%、叶1%;地下部分生物量仅占总生物量10%。在4种密度的林分中, I - 72杨人工林生物量的径级分布表现为波浪形,随着林分密度的增大,生物量高峰出现时的径阶有减小的趋势。Abstract: By the methods of sampling typical plots and allometric dimension analysis,the underground and aboveground biomass and net primary productivity(NPP) of Populus×euramericana cv.San Martino'(I-72/58) plantation with different densities were measured on the beach land of Yangtze River in Anqing City,Anhui Province.The results showed that the biomass of the stand increased from 102.40 t·hm-2to 147.2 t·hm-2,the productivity increased from 7.31 t·hm-2·a-1 to 10.52 t·hm-2·a-1with the trees number increased from 250 to 370 per hectare.Aboveground and underground biomass accounted for 90% and 10% of the total biomass.In aboveground biomass, the stem,branch,bark and leaf account for 54%,28%,7% and 1%,respectively.The diameter class distribution of biomass and tree' numbers both took on irregular undee curve in plantations with four different densities;at the same time,the more the portion of high diameter class,the more the biomass of the Populus×euramericana cv.'San Martino(I-72/58)'forest in a plantation with same density.
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