杉木人工林生态系统碳平衡的研究-森林培育学专业论文.docxVIP

杉木人工林生态系统碳平衡的研究摘 杉木人工林生态系统碳平衡的研究 摘 要 采用CID--301PS光合测定仪，对20年生杉木人工林生态系统的C02排放动态 进行了观测，并结合现存生物量统计法对其碳平衡进行了研究。结果如下： 建立了杉木木质器官呼吸速率(R)与粗度(D)之间的数量关系式(树干：R =65．67D’2％：树枝：R=0 067Dm 9：树根：R=0 24D。878)，阐述了树干呼吸速率 的季节变化及日变化规律，计算出杉木树干、树枝和树根的年呼吸量分别为算出杉 木林群落年呼吸量为19．943tCC’2hm-2．a～，其中，叶片年呼吸量为5．943tC02hm-2．a～。 对杉木林地土壤和凋落物的呼吸进行了季节动态测定，建立了土壤呼吸速率和凋 落物呼吸速率与温度的回归方程，并计算出杉木林地土壤和凋落物的年呼吸量分别 为1 0 592 tC02hm-2．a‘1和5 557 tC02·hm-2．a～。 采用生物量清查法对生态系统的碳贮量和碳分配进行了测定．指出杉木林中的碳 贮量为127 12tC-hm一，其主耍包括三个方面：即森林生物量、森林凋落物以及森林 i：壤中分别贮存了66．54 tC·hm～、3 57 tC rhm’2和55 96 tC．hm～。 从整个生态系统来看，生态系统中CO：平衡的基本动态为：每年用于群落总第 性生产：力所同化的C02总量为60 393 tC02hm-2,a一．其中又呼吸的形式排放C02 的蹴为34 073 tC02hm-2．a～，年结余C02量为26 32 tCOrhm-2．a一，相当于净固定碳 {l}为7 176tC．hm-2．a～。由此可见，杉木人王林对缓解大气C02浓度的升高．具有重 哥的现实意义。 ，● 关键词： 杉木人工林 森林生态系统 碳平衡 Study Study on the Carbon Balance in the Chinese fir Plantation Ecosystem Abstract Based on the measurement of respiration of woody organs，litter layer and soil，and the survey of bioproductivity,the carbon balance between assimilation and release was conducted in Chinese fir plantation forest compared with a secondary evergreen broadleaved forest The results showed that： ①The quantitative relationship between the respiration rate(R)and the diameter(D1 of woody organs was established The annual and daily changing pattern of the stem respiration were measured in relation to temperature The respiration consumptions by stems，branches and roots were measured to be 9 67tC02-hm-2．a～．2 2 1 tC02·hm-2．a‘1 and 2 1 2 tC02．hm～’a—respectively Combined with measurement of the respiration rate of needles．5 943 tee2．hm-2．a1．the annuaI total respiration of 20．year-old Chinese fir plantation forest was estimated to be 19 943 tCO：·hm-2．a1 That stem maintenance respiration was proved to be 34 3％ofits annual total respiration ②In addition，the dynamics of C02 evolution from the forest soil and the litter layer respiration were measured Based on the quantitative relationship established between their respiration rate and temperature，the annual