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英文文献：A Meta Regression Analysis of Soil Organic Carbon Sequestration in Corn Belt States: Implication for Cellulosic Biofuel Production-玉米带土壤有机碳封存的Meta回归分析:对纤维素生物燃料生产的影响
英文文献作者：Wamisho, Kassu
英文文献摘要：
This study investigated the extent to which statistical heterogeneity among results of multiple studies on soil organic carbon (SOC) sequestration rate in response to conventional tillage (CT) and no-till (NT) can be related to one or more characteristics of the studies. The analysis employed a random effect meta-regression technique using the data obtained from recently published experimental trials under continuous corn (CC) and corn soybean (CS) rotation system from selected Corn Belt states. Regarding the difference in the rate of SOC sequestration between NT and CT, our results shows that the percentage of heterogeneity in the true treatment effect that is attributable to between-study variability is 49%, whereas 51 % is attributable to within-study sampling variability. We find that 26% of the between-study variance is explained by the explanatory variables considered, and the remaining between-study variance appears almost zero. The regression results support the argument that the difference between NT and CT decreases as measurement depth increases. The results also show that the higher the initial SOC the higher the NT SOC sequestration rate relative to the CT sequestration rate. A test for publication biases in the analysis indicated no evidence for the presence of small-study effects.
本研究调查了传统耕作(CT)和免耕(NT)对土壤有机碳(SOC)固存率的多重研究结果之间的统计异质性与研究的一个或多个特征相关的程度。该分析采用随机效应元回归技术，使用最近发表的在选定的玉米带州的连续玉米(CC)和玉米大豆(CS)轮作系统下的试验数据。关于NT和CT间SOC隔离率的差异，我们的结果显示，由研究间差异引起的真实治疗效果的异质性百分比为49%，而由研究内取样差异引起的异质性百分比为51%。我们发现26%的研究间方差被考虑的解释变量解释，其余的研究间方差几乎为零。回归结果支持了NT和CT之间的差异随着测量深度的增加而减小的观点。结果还表明，初始有机碳含量越高，碳纳米管的固碳率相对于CT固碳率越高。在分析中对发表偏倚的测试表明，没有证据表明存在小规模研究的影响。
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