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.

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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2025, Vol. 49 ›› Issue (6) : 151-161. DOI: 10.12302/j.issn.1000-2006.202403008

The effect of water fertilizer coupling on carbon storage of S86 triploid Populus tomentosa plantation

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Abstract

【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.

Key words

water-fertilizer coupling / poplar plantation / ecosystem carbon storage / forestry carbon emissions

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ZHU Jingwei , JIA Liming , Gulimire Yilihamu , et al . The effect of water fertilizer coupling on carbon storage of S86 triploid Populus tomentosa plantation[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2025, 49(6): 151-161 https://doi.org/10.12302/j.issn.1000-2006.202403008

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