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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing.
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Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing.

机译：化学杀灭和耕作后，耕地和未耕地草地的土壤可溶性碳动态。

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Better understanding of soluble carbon (C) dynamics in managed grasslands fertilised with animal manures is required to effectively estimate nutrient transport potential and C loss during land-use change. Two adjacent grassland plots, one amended with 100 m3 ha-1 of liquid swine manure annually since 1978 and another unamended for the same period, were either killed by glyphosate in the autumn or left with vegetation intact. Those killed were either (i) left as an undisturbed chemical fallow, (ii) ploughed (20 cm depth) by full inversion tillage (FIT) in the autumn, or (iii) ploughed (20 cm depth) in the following spring. Microbial biomass C (MBC) and soluble C fractions: hot-water extractable organic C (HWEOC), cold-water extractable organic C (CWEOC), and dissolved organic C from tension lysimeters (DOC) were monitored during one full year following herbicide application and ploughing. On both unmanured and manured sites, HWEOC was positively correlated with MBC. However, on the manured grassland the slope of the HWEOC:MBC relationship was 55% higher than on the unmanured site indicating that the manured grassland accumulated more potentially soluble C per unit MBC than the unmanured grassland. Compared to the plots with intact vegetation and the chemical fallow, full inversion tillage reduced HWEOC and CWEOC by 10 to 30%, on both manured and unmanured soils, and reduced DOC in the soil solution of the manured soils. Peak DOC concentrations measured in the field occurred when soils were water-logged, particularly on the manured grassland. Our results suggest that manured grasslands on poorly-drained soils accumulate important quantities of readily soluble C which are prone to export as DOC when the soil becomes water-saturated. However, full inversion tillage of these grassland soils attenuated the amounts of readily soluble C and, in particular, the peaks in DOC.
机译：需要更好地了解使用动物肥料施肥的管理草地中的可溶性碳（C）动态，以有效估计土地利用变化期间的养分转运潜力和C损失。自1978年以来，每年有两处相邻的草地地被草甘膦杀死，其中一处自1978年以来每年进行100 m 3 ha -1 液态猪粪修正。秋天或留下完整的植被。那些被杀者要么被（i）保留为不受干扰的化学休耕物，要么（ii）在秋天通过完全倒耕（FIT）耕作（20厘米深），或（iii）在第二年春天耕作（20厘米深）。施用除草剂后的整整一年，监测微生物生物量碳（MBC）和可溶性碳组分：热水可萃取有机碳（HWEOC），冷水可萃取有机碳（CWEOC）和张力渗析仪（DOC）中的溶解有机碳和耕作。在未管理和未管理的地点，HWEOC与MBC呈正相关。但是，在有肥料的草原上，HWEOC：MBC关系的斜率比无肥料的地方高55％，这表明有肥料的草原每单位MBC的潜在可溶性C积累量要高于无草的草原。与完整植被和化学休耕地相比，在耕作和未耕作的土壤上，完全反转耕作可使HWEOC和CWEOC减少10％到30％，并且减少了耕作土壤的溶液中的DOC。当土壤浸水时，尤其是在肥草地上，便会在田间测量到最高DOC浓度。我们的研究结果表明，排水不良的土壤上的肥草地积聚了大量易溶的碳，当土壤变得水饱和时，它们很容易以DOC的形式输出。但是，这些草地土壤的完全反转耕作会削弱易溶碳的含量，尤其是DOC的峰值。

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