Influence of tillage on degradation kinetics using the litterbag method
Influence of tillage on degradation kinetics using the litterbag method
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DOI：
10.1016/j.ejsobi.2010.11.011
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发表时间：
2011-05-01
影响因子：
4.2
通讯作者：
Joergensen, Rainer Georg
中科院分区：
文献类型：
--
作者：
Jacobs, Anna;Ludwig, Bernard;Joergensen, Rainer Georg
在德国哥廷根附近的一个耕作试验中进行了一个凋落物袋试验，比较了铧式犁和旋转耙对有机质动态的长期影响。以贫氮、富木质素的小麦秸秆和富氮、贫木质素的玉米秸秆为材料，模拟绿色肥料的性质，研究了垃圾袋中碳的流失和氮的平衡。将垃圾袋分别埋在0-5 cm和15-20 cm处，分别于3、6、9和12个月后取出1/4。C损失率，校正土壤输入到垃圾袋，耕作和掩埋深度的显着影响，并表现出显着的凋落物材料x掩埋深度的相互作用。这是由于犁耕处理的碳损失率普遍较高，特别是在15-20 cm深度，以及在有玉米残留物的垃圾袋中。犁耕处理比旋耙处理有更多的土壤转移到凋落物袋中，并且在0-5 cm深度比15-20 cm深度的凋落物袋中发现更多的土壤。较少量的稳定团聚体在周围的土壤是最合理的解释，这种较高的土壤输入。在11月至2月的前三个月内，玉米残留物C损失了近40%，随后在接下来的9个月内损失了40%。前三个月几乎没有损失小麦秸秆C，随后的9个月几乎线性损失60%。氮平衡表现出强烈的氮损失与玉米残留物的凋落袋在所有曝光期间。与此相反，氮平衡总是积极的小麦秸秆。氮平衡，土壤输入校正，揭示了显着的埋深效应和曝光时间x埋深的相互作用，但没有显着的耕作效果。(C)2011年Elsevier Masson SAS。All rights reserved.
A litterbag experiment was carried out in a tillage trial near Gottingen, Germany, comparing the long-term effects of mouldboard plough and rotary harrow on organic matter dynamics. The aim was to investigate the C loss and N balances in litterbags filled with N-poor, lignin-rich wheat straw and N-rich, lignin-poor maize residues, simulating the properties of green manures. The litterbags were buried at 0-5 and 15-20 cm depth and one fourth of them were removed after 3, 6, 9, and 12 months, respectively. The C loss rates, corrected for soil input into the litterbags, were significantly affected by tillage and bury depth and showed significant litter material x bury depth interactions. These were caused by generally higher C loss rates in the plough treatment, especially at 15-20 cm depth, and in the litterbags with maize residues. More soil was transferred to the litterbags in the plough treatment than in the rotary harrow treatment and more soil was found in the litterbags at 0-5 cm than at 15-20 cm depth. A smaller amount of stable aggregates in the surrounding soil is the most plausible explanation for this higher soil input. Nearly 40% of maize residue C was lost in the first three months from November to February, followed by a further exponentially decreasing loss of 40% over the next 9 months. Almost no wheat straw C was lost in the first three months, followed by a nearly linear loss of 60% over the next 9 months. The N balance showed strong N losses in the litterbags with maize residues for all exposure periods. In contrast, the N balance was always positive for wheat straw. The N balances, corrected for soil input, revealed significant bury depth effects and exposure period x bury depth interactions, but no significant tillage effects. (C) 2011 Elsevier Masson SAS. All rights reserved.