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首页> 外文学位 >Carbon dioxide and methane fluxes and organic carbon accumulation in old field and northern temperate forest plantation soils.
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Carbon dioxide and methane fluxes and organic carbon accumulation in old field and northern temperate forest plantation soils.

机译：旧田和北方温带森林人工林土壤中的二氧化碳和甲烷通量以及有机碳积累。

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Carbon dioxide (CO2) and methane (CH4) fluxes from the soil surface, and concentrations within the soil profile, were measured between June 1998 and Sept. 1999 at four adjacent forest plantations and an old field in Nepean, Ontario. The objectives of this study were to quantify seasonal CO2 and CH4 fluxes from the soil surface and within the soil profile to determine the effect of soil moisture and temperature, and forest age and species on the exchange, and establish a chronosequence of organic carbon accumulation in the forest plantations and the old field soils.; Dynamic and static chamber techniques were used to measure surface fluxes of CO2 and CH4, respectively, and soil gas concentrations were sampled with probes. In the old field and forest plantations, surface soil CO2 flux ranged from 2.9 to 27 g CO2 m-2 d-1 and 2.0 to 39 g CO2 m -2 d-1 respectively. Significant differences due to age and species of plantation were observed. Seasonal variations in CO2 efflux from the soil surface and within the soil profile were related to variation in soil temperature and moisture. Uptake of CH4 was observed at all sites and there was no significant differences in flux due to vegetation type or age. Maximum rate of CH4 consumption was 6.3 mg CH4 m-2 d-1. Methane uptake was positively related to soil moisture conditions.; The carbon content of the soil increased in all sites following the establishment of vegetation on sandy parent material. Carbon content was greatest in the upper soil profile. Rates of carbon accumulation ranged from 109 to 426 g m-2 y-1. Soil carbon increased with increasing age of plantation during the first 30 years following the establishment of vegetation on parent material, but declined as the forest plantation matured.
机译：在1998年6月至1999年9月之间，在安大略省Nepean的四个相邻的人工林和一个旧田中，测量了土壤表面的二氧化碳（CO2）和甲烷（CH4）通量以及土壤剖面中的浓度。这项研究的目的是量化土壤表面和土壤剖面内的季节性CO2和CH4通量，以确定土壤水分和温度，森林年龄和物种对交换的影响，并建立有机碳积累的时间序列。人工林和旧田地土壤。使用动态和静态腔室技术分别测量CO2和CH4的表面通量，并使用探针对土壤气体浓度进行采样。在老农田和森林人工林中，表层土壤CO2通量分别为2.9至27 g CO2 m-2 d-1和2.0至39 g CO2 m -2 d-1。观察到由于年龄和人工林种类的显着差异。从土壤表面到土壤剖面的CO2排放量的季节性变化与土壤温度和湿度的变化有关。在所有地点均观测到CH4的吸收，并且由于植被类型或年龄而导致的通量没有显着差异。 CH4消耗的最大速率为6.3 mg CH4 m-2 d-1。甲烷的吸收与土壤水分状况呈正相关。在沙质母质上建立植被后，土壤中的碳含量在所有地点都增加了。碳含量在上部土壤剖面中最大。碳积累速率为109至426 g m-2 y-1。在母本上建立植被后的前30年中，土壤碳随着人工林年龄的增加而增加，但随着人工林的成熟而减少。

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