Carbon sequestration and mineralization of aggregate-associated carbon in an intensively cultivated Anthrosol in north China as affected by long term fertilization
Carbon sequestration and mineralization of aggregate-associated carbon in an intensively cultivated Anthrosol in north China as affected by long term fertilization
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DOI：
10.1016/j.geoderma.2017.02.023
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发表时间：
2017-06
期刊：
影响因子：
6.1
通讯作者：
Jun-yu Xie;Miao-miao Hou;Yingtian Zhou;Renjie Wang;Shulan Zhang;Xueyun Yang;B. Sun
中科院分区：
文献类型：
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作者：
Jun-yu Xie;Miao-miao Hou;Yingtian Zhou;Renjie Wang;Shulan Zhang;Xueyun Yang;B. Sun
了解不同施肥措施下有机碳在团聚体中的固存及其稳定性，对于改善土壤质量、提高作物产量和减缓气候变化具有重要意义。采用长期定位试验，研究了小麦-玉米集约种植条件下有机肥和无机肥对土壤团聚体有机碳及其矿化的影响，以及对土壤有机碳储量的影响。试验设3个处理：CK，不施肥对照; NPK，氮（N）、磷（P）、钾（K）肥料; MNPK，有机肥（M）配施N、P、K肥料。收集并分析土壤样品，以确定团聚体的粒度分布，通过干筛分离;团聚体（> 2，0.25-2和< 0.25 mm）和散装土壤中的OC和N浓度;以及21年后0-10和10-20 cm土层团聚体和散装土壤的呼吸作用。施肥并不影响团聚体的大小分布在表层土壤层，但有一个显着的变化，在次表层响应粪肥添加。NPK和MNPK的应用显着，均匀地增强OC和N封存在三个聚集类测试。然而，OC矿化率显着高于在微观团聚体比在宏观团聚体。施用NPK和MNPK大大增加了有机碳矿化的团聚体和散装土壤; MNPK产生的最高值。有机碳矿化速率在表层的三个处理之间是相当的，但他们增加了在亚表层，因为添加有机肥。总的来说，与对照处理相比，NPK和MNPK处理21年的土壤在顶部20 cm处的OC库分别增加了7.42和22.83 Mg C ha− 1，平均封存率分别为353和1087 kg C ha− 1 yr − 1。因此，适当的应用NPK，单独或与粪肥相结合，可以导致改善OC封存均匀增加团聚体相关的OC，并提供相同程度的保护OC在大团聚体和微团聚体下冬小麦-夏玉米轮作人工土壤。
Understanding organic carbon (OC) sequestration in aggregates and OC stability under different fertilization practices is of key importance in improving soil quality and crop productivity and in mitigating the causes of climate change. A long-term field experiment established in 1990 was used to assess the influence of organic and inorganic fertilizers on aggregate-associated OC and its mineralization and on the SOC stock at a soil depth of 0–20 cm under an intensive wheat-maize cropping system on Anthrosol in North China. The study involved three treatments: CK, control without fertilization; NPK, nitrogen (N), phosphorus (P) and potassium (K) fertilizers; MNPK, manure (M) combined with N, P and K fertilizers. Soil samples were collected and analyzed to determine the size distribution of aggregates, which were separated by dry sieving; the concentrations of OC and N in aggregates (> 2, 0.25–2 and < 0.25 mm) and bulk soils; and respiration from aggregates and bulk soils in the 0–10 and 10–20 cm layers after 21 years. Fertilization did not affect the size distribution of aggregates in the surface soil layer, but there was a significant change in the subsurface layer in response to manure addition. Application of NPK and MNPK significantly and evenly augmented OC and N sequestration in the three aggregate classes tested. However, the OC mineralization rate was substantially higher in micro- than in macro-aggregates. Application of NPK and MNPK considerably increased OC mineralization in both aggregates and bulk soils; MNPK yielded the highest values. OC mineralization rates in bulk soils were comparable among the three treatments for the surface layer, but they increased in the subsurface layer because of adding manure. Overall, soils treated for 21 years with NPK and MNPK showed increases in the OC pools in the top 20 cm of 7.42 and 22.83 Mg C ha− 1, respectively, compared with the control treatment, and had average sequestration rates of 353 and 1087 kg C ha− 1yr− 1respectively. Thus, appropriate application of NPK, alone or in combination with manure, can lead to improved OC sequestration by evenly augmenting aggregate-associated OC and providing the same degree of protection for OC in both macro-aggregates and micro-aggregates under a winter wheat-summer maize rotation on Anthrosol.