Zhou Fei-Fei, Lin Bo, Liu Qing
Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China.
Ying Yong Sheng Tai Xue Bao. 2009 Aug;20(8):1783-90.
By the method of infrared CO2 determination in closed dynamic chamber system, the soil respiration in natural spruce forest, and 22-, 35-and 65-year old spruce plantations in eastern Qinghai-Tibet plateau was measured in situ, and the soil heterotrophic and autotrophic respiration was differentiated by entrenchment. In the four spruce forests, soil respiration rate had a significant positive exponential correlation with the soil temperature at depth 5 cm, but less correlation with the soil moisture content at the same depth. The annual soil respiration flux was 792.08-1070.20 g C x m(-2) x a (-1), and decreased in the order of natural spruce forest > 22-year old spruce plantation > 65-year old spruce plantation >35-year old spruce plantation. The annual soil autotrophic and heterotrophic respiration fluxes were 253.36-357.05 g C x m(-2) x a(-1) and 538.69-703.82 g C x m(-2) x a(-1), respectively, and had the same variation trend as the annual soil respiration flux. The Q10 value of soil respiration in 22-, 35-, and 65-year old spruce plantations and in natural spruce forest in growth season (from Nov. 2007 to Mar. 2008) and non-growth season (from Apr. 2008 to Oct. 2008) were 4.59, 6.54, 4.77, and 3.18, and 4.17, 4.66, 3.11, and 2.74, respectively. Except that in 22-year old spruce plantation, the Q10 value was decreased with increasing restoration year, and was obviously higher in non-growth season than in growth season.
采用密闭动态箱系统中的红外CO₂测定法，对青藏高原东部天然云杉林以及22年、35年和65年生云杉人工林的土壤呼吸进行了原位测定，并通过 trenching（此处未明确“trenching”准确含义，推测可能是“壕沟法”之类，暂按此翻译）区分了土壤异养呼吸和自养呼吸。在这4片云杉林中，土壤呼吸速率与5厘米深度处的土壤温度呈显著正指数相关，而与同一深度处的土壤含水量相关性较小。年土壤呼吸通量为792.08 - 1070.20克碳×米⁻²×年⁻¹，其大小顺序为天然云杉林＞22年生云杉人工林＞65年生云杉人工林＞35年生云杉人工林。年土壤自养呼吸通量和异养呼吸通量分别为253.36 - 357.05克碳×米⁻²×年⁻¹和538.69 - 703.82克碳×米⁻²×年⁻¹，且与年土壤呼吸通量具有相同的变化趋势。22年、35年和65年生云杉人工林以及天然云杉林在生长季（2007年11月至2008年3月）和非生长季（2008年4月至2008年10月）的土壤呼吸Q10值分别为4.59、6.54、4.77和3.18，以及4.17、4.66、3.11和2.74。除22年生云杉人工林外，Q10值随恢复年限增加而降低，且在非生长季明显高于生长季。
