Impact of Sitka spruce (Picea sitchensis (Bong.) Carr.) afforestation on the carbon stocks of peaty gley soils – a chronosequence study in the north of England
Impact of Sitka spruce (Picea sitchensis (Bong.) Carr.) afforestation on the carbon stocks of peaty gley soils – a chronosequence study in the north of England
复制标题
西特卡云杉 (Picea satchensis (Bong.) Carr.) 造林对泥炭灰土碳储量的影响——英格兰北部的一项时间序列研究
DOI：
10.1093/forestry/cpz013
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
J. Morison
中科院分区：
文献类型：
--
作者：
E. Vanguelova;P. Crow;S. Benham;R. Pitman;J. Forster;E. L. Eaton;J. Morison
本研究旨在量化锡特卡云杉(Picea Sitchens(Bong.)Carr.)通过英格兰北部基尔德森林的40个样地的100年时间序列，对泥炭潜育土的C类土壤进行了研究。与无凋落物的开阔荒地相比，绿地凋落物C层蓄积量为4.11t C ha⁻？(3.58~4.70，95%CI)。在有机F土层中，随着时间的推移，碳库以每年1.3%的速度显著积累，轮作(轮作1：49.7tC ha⁻？；轮作2：24.0t C ha⁻？)的平均C库存在显著差异，随着时间的推移(轮作结束1：11厘米；轮作结束2：6.5厘米)，土层厚度以每年11%的速度显著增加(P<；0.05)。随着时间的推移或在泥炭(H)地平线上的不同轮换，C库存没有显著变化，除了在第一次轮换的前30年中明显的C损失。H层C组、C组厚度和C浓度均随海拔升高而显著增加(P<；0.05)。矿物层(0~20 cm)土壤碳储量变化不大，但随着造林年限的增加，土壤碳含量显著增加。植树造林以来全剖面(70~100 cm土层)土壤碳平均蓄积率随时间的变化不显著。这些发现表明，泥炭H层中碳的高度变异性可能是由于与造林和采伐过程中的干扰有关的淋溶、氧化和分解过程所致。第一次轮作期间泥炭层中碳的损失被上层有机F层中的碳积累所补偿。因此，在两次针叶树造林轮作中，基尔德有机矿质土壤的总碳储量没有变化。
This study aimed to quantify the medium-term impact of afforestation with Sitka spruce (Picea sitchensis (Bong.) Carr.) on C stocks of peaty gley soils through a 100 year chronosequence of 40 plots in Kielder Forest, northern England. Litter layer C stocks in the afforested plots were 4.11 t C ha⁻¹ (3.58–4.70, 95 per cent CI) compared with open moorland, which had no litter. In the organic F horizon, C stocks accumulated significantly through time at a rate of 1.3 per cent per year, with a significant difference in average C stocks by rotation (rotation 1: 49.7 t C ha⁻¹; rotation 2: 24.0 t C ha⁻¹) and a significant increase in horizon thickness through time (end of rotation 1: 11 cm; end of rotation 2: 6.5 cm) at a rate of 11 per cent per year (P < 0.05). There was no significant change in C stocks through time or across different rotations in the peat (H) horizon, with the exception of a noticeable C loss during the first 30 years of first rotation. H horizon C stock, its thickness and C concentration all increased significantly (P < 0.05) with altitude. Although soil C stocks in the mineral A horizon (0–20 cm depth) did not change significantly with any tested factors, soil C concentration significantly increased with afforested years. The average whole-profile (down to 70–100 cm depth) soil C stock rate of change with time since afforestation was not significant. These findings suggest that the high variability in C change in the peat H horizon was likely due to leaching, oxidation and decomposition processes linked with disturbance during afforestation and clearfelling. The loss of C in the peat layer during the first rotation was compensated by C accumulation in the upper organic F horizon. Over two rotations of conifer afforestation, the total C stock of the organo-mineral soils at Kielder was therefore unchanged.