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The effect of water fertilizer coupling on carbon storage of S86 triploid Populus tomentosa plantation
ZHU Jingwei, JIA Liming, Gulimire Yilihamu, QU Guanbo, SUN Yiming, XU Kexin, ZHOU Ou, WANG Yafei
Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2025, Vol. 49 ›› Issue (6) : 151-161.
PDF(1894 KB)
PDF(1894 KB)
The effect of water fertilizer coupling on carbon storage of S86 triploid Populus tomentosa plantation
【Objective】This study aims to explore the changes in carbon storage and its allocation patterns in poplar (Populus spp.) plantation ecosystems under different water-fertilizer coupling treatments in the sandy areas of the Yellow River flood plain in north China. The findings will provide a scientific basis for enhancing the carbon sequestration capacity of poplar plantations and optimizing their management techniques.【Method】The study focused on six-year-old triploid P. tomentosa (S86) plantations under different water-fertilizer coupling treatments at the State-owned Old Town Forest Farm in Gaotang, Shandong. Thirteen treatments were established, including three irrigation levels (initiated when soil water potential at 20 cm below the dripper reached -20, -33, and -45 kPa, denoted as W1, W2, and W3, respectively), four nitrogen application levels [120, 190, 260, and 0 kg/(hm2·a), denoted as N1, N2, N3, and N4], and a control (CK). Partial biomass of the arbor layer was obtained using the harvest method, and regression equations were established to estimate the total tree layer biomass. The biomass of the shrub-herb layer and litter layer was measured via the harvest method. Soil samples were collected from (0, 20],(20, 40],(40, 60],(60,100]cm depths. Carbon content in plants and soil was determined, and carbon density and carbon storage were estimated based on carbon content and biomass. Carbon emissions from irrigation and fertilization in forest management were calculated to derive the net ecosystem carbon storage.【Result】After six years of water-fertilizer coupling treatments, the carbon storage in the tree and shrub-herb layers under the W1N1 treatment was significantly higher than that of CK (P<0.05), reaching 51.58 t/hm2. The shrub-herb layer accounted for 0.15%-0.22% of the total ecosystem carbon storage. The litter layer contributed 0.37%-0.46% of the ecosystem carbon storage, with no significant differences among treatments. Soil organic carbon storage varied significantly (P<0.05), with the highest under W1N3 (75.28 t/hm2) and the lowest under CK (54.74 t/hm2). The ecosystem carbon storage under W1N1 (116.61 t/hm2), W1N2 (116.58 t/hm2), and W1N3 (121.63 t/hm2) treatments was significantly higher than that of CK (P<0.05). The combined carbon storage of the arbor layer and soil layers exceeded 99%, indicating that these layers are the largest carbon pools in poplar plantation ecosystems. After deducting forestry carbon emissions, the net ecosystem carbon storage under W2N1, W2N2, W2N3, and W3N3 treatments decreased compared with that of CK but remained significantly higher than that of CK.【Conclusion】Compared to CK, high-water irrigation coupled with any fertilization treatment significantly increases the carbon storage and net carbon storage of poplar plantations in the sandy areas of the North China Plain. These treatments have the greatest impact on carbon storage, facilitating rapid and stable accumulation in the ecosystem. This study recommends optimizing water and fertilizer management for Populus tomentosa plantations in the sandy areas of the North China Plain, with an irrigation threshold of -20 kPa combined with nitrogen fertilization.
water-fertilizer coupling / poplar plantation / ecosystem carbon storage / forestry carbon emissions
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在广泛收集资料的基础上，估算了我国主要森林生态系统的碳贮量和碳平衡通量，分析了它们的区域特征。主要结果如下：1)我国森林生态系统的平均碳密度是258.83t·hm<sup>-2</sup>，基本趋势是随纬度的增加而增加；其中植被的平均碳密度是57.07t·hm<sup>-2</sup>，随纬度的增加而减小；土壤碳密度约是植被碳密度的3．4倍，其区域特点与植被碳密度呈相反趋势，随纬度升高而增加；凋落物层平均碳密度是8.21t·hm<sup>-2</sup>，随水热因子的改善而减小。2)森林生态系统有机碳库包括植被、土壤和凋落物层3个部分，采用林业部调查规划设计院1989～1993年最新统计的我国森林资源清查资料，估算我国主要森林生态系统碳贮量为281.16×10<sup>8</sup>t，其中植被碳库、土壤碳库、凋落物层碳库分别为62.00×10<sup>8</sup>t、210.23×10<sup>8</sup>t、8.92×10<sup>8</sup>t。落叶阔叶林、暖性针叶林、常绿落叶阔叶林、云冷杉(Picea-Abies)林、落叶松(Larix)林占森林总碳贮量的87％，是我国森林主要的碳库。3)我国森林生态系统在与大气的气体交换中表现为碳汇，年通量为4.80×10<sup>8</sup>t·a<sup>-1</sup>，基本规律是从热带向寒带，碳汇功能下降，这取决于系统碳收支的各个通量之间的动态平衡；阔叶林的固碳能力大于针叶林。我国森林生态系统可以吸收生物物质、化石燃料燃烧和人口呼吸释放总碳量(9.87×10<sup>8</sup>t·a<sup>-1</sup>)的48.7％。
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Cuttings of balsam spire hybrid poplar (Populus trichocarpa var. Hastata Henry x Populus balsamifera var. Michauxii (Dode) Farwell) were grown in sand culture and irrigated every 2 (W) or 10 (w) days with a solution containing either 3.0 (N) or 0.5 (n) mol nitrogen m(-3) for 90 days. Trees in the WN (control) and wn treatments had stable leaf nitrogen concentrations averaging 19.4 and 8.4 mg g(-1), respectively, over the course of the experiment. Trees in the Wn and wN treatments had a similar leaf nitrogen concentration, which increased from 12.0 to 15.8 mg g(-1) during the experiment. By the final harvest, mean stomatal conductances of trees in the wN and wn treatments were less than those of trees in the Wn and WN treatments (1.8 versus 4.6 mm s(-1)). Compared to the WN treatment, biomass at the final harvest was reduced by 61, 72 and 75% in the Wn, wN and wn treatments, respectively. At the final harvest, WN trees had a mean total leaf area of 4750 +/- 380 cm(2) tree(-1) and carried 164 +/- 8 leaves tree(-1) with a specific leaf area of 181 +/- 16 cm(2) g(-1), whereas Wn trees had a smaller mean total leaf area (1310 +/- 30 cm(2) tree(-1)), because of the production of fewer leaves (41 +/- 6) with a smaller specific leaf area (154 +/- 2 cm(2) g(-1)). A greater proportion of biomass was allocated to roots in Wn trees than in WN trees, but component nitrogen concentrations adjusted such that there was no Wn treatment effect on nitrogen allocation. Compared with WN trees, rates of photosynthesis and respiration per unit weight of tissue of Wn trees decreased by 28 and 31%, respectively, but the rate of photosynthesis per unit leaf nitrogen remained unaltered. The wN and Wn trees had similar leaf nitrogen concentrations; however, compared with the Wn treatment, the wN treatment decreased mean total leaf area (750 +/- 50 cm(2) tree(-1)), number of leaves per tree (29 +/- 2) and specific leaf area (140 +/- 6 cm(2) g(-1)), but increased the allocation of biomass and nitrogen to roots. Net photosynthetic rate per unit leaf nitrogen was 45% lower in the wN treatment than in the other treatments. Rates of net photosynthesis and respiration per unit weight of tissue were 48 and 33% less, respectively, in wN trees than in Wn trees.
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| [48] |
张婷, 邹显花, 李林鑫, 等. 根系获取资源过程中的代谢成本权衡策略研究进展[J]. 西北林学院学报, 2023, 38(4):149-155.
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| [49] |
张婷, 熊有才. 干旱条件下不同倍体春小麦根系碳消耗及其与产量形成的关系[J]. 湖北农业科学, 2013, 52(5):1004-1006,1011.
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| [50] |
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| [51] |
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| [52] |
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