Changes in soil carbon and nutrient pools along a chronosequence of poplar plantations in the Columbia Plateau, Oregon, USA
Changes in soil carbon and nutrient pools along a chronosequence of poplar plantations in the Columbia Plateau, Oregon, USA
复制标题
DOI：
10.1016/j.agee.2007.01.026
复制
发表时间：
2007-11-01
影响因子：
6.6
通讯作者：
Eaton, James A.
中科院分区：
文献类型：
--
作者：
Sartori, Fabio;Lal, Rattan;Eaton, James A.
为了满足木材和生物能源生产的需求，建立短轮伐期木本作物(SRWC)种植园需要开垦农田和荒漠土壤，例如美国俄勒冈州哥伦比亚高原南部的土地。以杨树为研究对象，研究了人工林经营对土壤碳储量和养分浓度的影响。风成土壤上的立足点(旱生旋风样)。对1、3、4、7、9和10年生林分(每个林龄n=3)以及邻近的农田和荒漠地在0-50 cm土层内的土壤碳、无机碳(SIC)、全氮(N)和养分浓度进行了比较。对第一轮轮作的7年生到10年生的林分进行灌溉和施肥。在第二个轮作周期中，1至4年生的林分在灌溉和施肥处理的基础上，还接受了覆盖处理。在11年生时，预测的人工林C(147.5 mg ha(-1))几乎全部积累在地上生物量(62.2%)、林地被层(24.3%)和根(11.7%)中。矿质土壤的碳库和氮库没有随着林分年龄的增加而显著增加，尽管表层有增加的趋势。从第一代(23.5+/-1.7 mg C ha(-1))到第二代(26.3+/-3.5 mg C ha(-1))，矿质土壤碳库的积累(与1.8%相似)部分被灌溉造成的碳化硅损失所抵消。碳化碳库呈下降趋势，这与方解石沿土壤剖面的溶解有关，从第一代(16.7+/-3.4 mg C ha(-1))到第二代(8.4+/-5.0 mg C ha(-1))。土壤pH(r>；0.6)和交换性酸度(r=-0.5)模式取决于交换性钙离子浓度。土壤Mg~(2+)、K~+浓度与表层土壤C浓度呈显著正相关(r=0.5)。在粗质土壤中，十年时间尺度不足以衡量矿物土壤碳库的显著变化。然而，可通过地上(树木和森林地面)和地下(根)生物量积累获得碳效益。SRWC种植园是恢复干旱地区退化土地的有效土地利用选择。(C)2007 Elsevier B.V.保留所有权利。
Establishment of short-rotation woody crop (SRWC) plantations for meeting the demand of wood and bioenergy production necessitates reclamation of agricultural lands and desert soils, such as those in the southern Columbia Plateau of Oregon, USA. The effects of plantation management on soil carbon (C) storage and nutrient concentration were evaluated, using a chronosequence of poplar (Populus spp.) stands on soils of eolian origin (Xeric Torripsamments). Stands of ages 1, 3, 4, 7, 9, and 10 years (n = 3 per stand age), as well as adjacent agricultural and desert lands, were compared based on soil C, inorganic C (SIC), total nitrogen (N), and nutrient concentrations within the 0- to 50-cm soil depth. The 7- through 10-year-old stands that were in a first-rotation cycle were irrigated and fertilized. The 1- through 4-year-old stands in a second-rotation cycle received a mulch application treatment in addition to the irrigation and fertilization treatments. At age 11 years, the projected plantation C (147.5 Mg ha(-1)) accumulated almost entirely in the aboveground biomass (62.2%), forest floor (24.3%), and roots (11.7%). There were no significant increases in the mineral soil C and N pools with stand age, despite the presence of increasing trends within the surface layer. The accumulation of the mineral soil C pool (similar to 1.8%), from the first- (23.5 +/- 1.7 Mg C ha(-1)) to the second-rotation stands (26.3 +/- 3.5 Mg C ha(-1)), was partially offset by a loss of SIC due to irrigation. The SIC pool had a decreasing trend, which was related to dissolution of calcite along the soil profile, from the first- (16.7 +/- 3.4 Mg C ha(-1)) to the second-rotation stands (8.4 +/- 5.0 Mg C ha(-1)). Soil pH (r > 0.6) and exchangeable acidity (r = -0.5) patterns were dependent upon the concentration of exchangeable Ca2+. Soil Mg2+ and K+ concentrations were correlated with soil C concentration in the surface layer (r = 0.5). In coarse-textured soils, a decadal time scale was insufficient to measure significant changes in the mineral soil C pool. Carbon benefits may be gained, however, in aboveground (tree and forest floor) and belowground (roots) biomass accumulations. SRWC plantations are an effective land-use option to restore degraded lands of arid regions. (C) 2007 Elsevier B.V. All rights reserved.