喀斯特城市亮叶桦意杨混交林生态系统生物量及生产力研究

Biomass and productivity of Betula luminifera and Italian poplar mixed-forests ecosystem in karst city

采用现场实测的方法,对喀斯特城市贵阳市的亮叶桦+意杨人工林生态系统不同层次生物量、林分生产力进行了研究。结果表明:10年生亮叶桦和意杨单株生物量分别为9.54kg和7.03kg;林分中乔木层生物量为4.03t.hm-2,地上部分生物量为3.42t.hm-2,占乔木层总生物量的84.9%;林分生产力为0.988t.hm-2a-1,以树叶生产力最高,为0.65t.hm-2a-1,占林分总生产力的65.8%;林下灌木层生物量为6 052.1t.hm-2,以毛栗生物量最高,为2 551.84t.hm-2,占灌木层生物量的42.16%;草本层生物量为4 109.98t.hm-2,以蕨最多,生物量为2 347.43t.hm-2,占草本层生物量的57.1%;死地被物层生物量为2 509.87t.hm-2,以未分解层生物量1 124.80t.hm-2最高,占死地被物层生物量的44.8%。研究结果可为喀斯特城市森林改善生态环境、碳平衡计算及森林可持续经营提供科学依据。

Base on method of the field measurement,biomass and productivity of different layers in Betula luminifera and Italian poplar mixed-forests were investigated in Guiyang city.The results show that biomass of Betula luminifera and Italian poplar which were in 10-years-old was 9.54 kg and 7.03 kg;biomass in arbor layer was 4.03 t·hm-2,and aboveground biomass was 3.42 t·hm-2,which made up 84.90% of the total biomass in arbor layer.The stand productivity was 0.988 t·hm-2a-1,and the productivity of leaf was 0.65 t·hm-2a-1 which was highest,and it made up 65.80% of the total productivity.The biomass in shrub layer was 6 052.1 t·hm-2,and the biomass of Chinese chestnut was 2 551.84 t·hm-2 which was highest,and made up 42.16% of the total biomass;The biomass in herbivorous layer was 4 109.98 t·hm-2,and the biomass of Pteridium aquilinum was 2 347.43 t·hm-2 which was highest,and made up 57.1% of the total biomass;biomass in dead litter layer was 2 509.87 t·hm-2,and the biomass of non-decomposed part was 1 124.80 t·hm-2 which was highest,and made up 44.8% of the total biomass.The results provide a scientific basis for improving the ecological environment,calculating carbon balance and sustainable forest management in karst city.