No-tillage and soil-profile carbon sequestration: An on-farm assessment
No-tillage and soil-profile carbon sequestration: An on-farm assessment
复制标题
DOI：
10.2136/sssaj2007.0233
复制
发表时间：
2008-05-01
影响因子：
2.9
通讯作者：
Lal, R.
中科院分区：
文献类型：
--
作者：
Blanco-Canqui, Humberto;Lal, R.
免耕（NT）耕作在保持水土方面上级精耕细作，但其在所有环境中固碳的潜力及其对土壤剖面SOC分布的影响尚不清楚。因此，我们评估了长期以NT为基础的种植制度对整个土壤剖面SOC固存的影响（0-60-cm土壤深度）在11个主要土地资源区（MLRA：121，122，和125在肯塔基州; 99，124，139 A在俄亥俄州;和139 B，139 C，140，147，和148在宾夕法尼亚州）在美国东部。土壤采样配对NT和犁耕作（PT）为基础的种植系统和相邻的林地（WL）。免耕对土壤有机碳和氮的影响具有土壤特异性。在11个MLRA中，有5个（121，122，124，139 A和148）的NT土壤中的SOC和N浓度大于PT土壤，但仅在0- 10-cm深度内。在MLRA 124中，10 cm以下，NT土壤的SOC低于PT土壤。在整个土壤剖面（0-60 cm）上，NT和PT处理的总有机碳含量差异不显著（P > 0.10），这与前人的研究结果雅阁。事实上，总土壤剖面有机碳在PT土壤是50%以上的MLRA 125，21%，MLRA 99和41%，在MLRA 124相比，在NT土壤。总体而言，这项研究表明，NT耕作增加了一些土壤上层的SOC浓度，但它并没有存储SOC比PT土壤的整个土壤剖面。
No-tillage (NT) farming is superior to intensive tillage for conserving soil and water, yet its potential for sequestering soil organic carbon (SOC) in all environments as well as its impacts on soil profile SOC distribution are not well understood. Thus, we assessed the impacts of long-term NT-based cropping systems on SOC sequestration for the whole soil profile (0-60-cm soil depth) across 11 Major Land Resource Areas (MLRAs: 121, 122, and 125 in Kentucky; 99, 124, 139A in Ohio; and 139B, 139C, 140, 147, and 148 in Pennsylvania) in the eastern United States. Soil was sampled in paired NT and plow tillage (PT) based cropping systems and an adjacent woodlot (WL). No-tillage farming impacts on SOC and N were soil specific. The SOC and N concentrations in NT soils were greater than those in PT soils in 5 out of 11 MLRAs (121, 122, 124, 139A, and 148), but only within the 0- to 10-cm depth. Below 10 cm, NT soils had lower SOC than PT soils in MLRA 124. The total SOC with NT for the whole soil profile (0-60 cm) did not differ from that with PT (P > 0.10) in accord with several previous studies. In fact, total soil profile SOC in PT soils was 50% higher in MLRA 125, 21% in MLRA 99, and 41% in MLRA 124 compared with that in NT soils. Overall, this study shows that NT farming increases SOC concentrations in the upper layers of some soils, but it does not store SOC more than PT soils for the whole soil profile.