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Soil respiration in tropical seasonal rain forest in Xishuangbanna, SW China

机译:中国西双版纳热带季节性雨林的土壤呼吸

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With the static opaque chamber and gas chromatography technique, from January 2003 to January 2004 soil respiration was investigated in a tropical seasonal rain forest in Xishuangbanna, SW China. In this study three treatments were applied, each with three replicates: A (bare soil), B (soil+litter), and C (soil+litter+seedling). The results showed that soil respiration varied seasonally, low from December 2003 to February 2004, and high from June to July 2004. The annual average values of CO_2 efflux from soil respiration differed among the treatments at 1% level, with the rank of C (14642 mgCO_2 · m~(-2) · h~(-1)) > B (12807 mgCO_2 · m~(-2) · h~(-1)) > A (9532 mgCO_2 · m~(-2) · h~(-1)). Diurnal variation in soil respiration was not apparent due to little diurnal temperate change in Xishuangbanna. There was a parabola relationship between soil respiration and soil moisture at 1% level. Soil respiration rates were higher when soil moisture ranged from 35% to 45%. There was an exponential relationship between soil respiration and soil temperature (at a depth of 5cm in mineral soil) at 1 % level. The calculated do values in this study, ranging from 2.03 to 2.36, were very near to those of tropical soil reported. The CO_2 efflux in 2003 was 5.34 kgCO_2 · m~(-2) · a~(-1) from soil plus litter plus seedling, of them 3.48 kgCO_2 · m~(-2) · a~(-1) from soil (accounting for 62.5%), 1.19 kgCO_2 · m~(-2) · a~(-1) from litter (22.3%) and 0.67 kgCO_2 · m~(-2) · a~(-1) from seedling (12.5%).
机译:利用静态不透明腔室和气相色谱技术,从2003年1月至2004年1月,在中国西南地区西双版纳的热带季节性雨林中调查了土壤呼吸。在这项研究中,应用了三种处理,每种处理具有三个重复:A(裸土),B(土壤+凋落物)和C(土壤+凋落物+幼苗)。结果表明,土壤呼吸随季节变化,从2003年12月至2004年2月为低,而从2004年6月至2004年7月为高。各处理中土壤呼吸的CO_2年均流出量在1%的水平上存在差异,C等级为14642 mgCO_2·m〜(-2)·h〜(-1))> B(12807 mgCO_2·m〜(-2)·h〜(-1))> A(9532 mgCO_2·m〜(-2)· h〜(-1))。由于西双版纳的昼夜温带变化很小,土壤呼吸的昼夜变化不明显。土壤呼吸与土壤水分在1%的水平之间存在抛物线关系。当土壤水分在35%至45%之间时,土壤呼吸速率更高。在1%的水平下,土壤呼吸与土壤温度(在矿物土壤中5cm处)之间呈指数关系。这项研究中计算出的do值在2.03至2.36之间,非常接近报道的热带土壤。 2003年土壤+垃圾+苗木的CO_2外排量为5.34kgCO_2·m〜(-2)·a〜(-1),其中土壤3.48kgCO_2·m〜(-2)·a〜(-1)(占62.5%),凋落物(22.3%)为1.19 kgCO_2·m〜(-2)·a〜(-1),苗木为0.67 kgCO_2·m〜(-2)·a〜(-1)(12.5%) )。

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