水肥耦合对S86三倍体毛白杨人工林碳储量的影响

朱静伟; 贾黎明; 古丽米热&#x000B7;依力哈木; 曲冠博; 孙一鸣; 续可心; 周欧; 王亚飞

doi:10.12302/j.issn.1000-2006.202403008

朱静伟, 贾黎明, 古丽米热·依力哈木, 曲冠博, 孙一鸣, 续可心, 周欧, 王亚飞

南京林业大学学报（自然科学版） ›› 2025, Vol. 49 ›› Issue (6) : 151-161.

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南京林业大学学报（自然科学版） ›› 2025, Vol. 49 ›› Issue (6) : 151-161. DOI: 10.12302/j.issn.1000-2006.202403008

研究论文

水肥耦合对S86三倍体毛白杨人工林碳储量的影响

作者信息 +

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

Author information +

文章历史 +

摘要

【目的】探讨华北黄泛平原沙地不同水肥耦合处理下杨树(Populus spp.)人工林生态系统碳储量及其分配格局变化,为提高杨树人工林固碳增汇能力以及优化杨树人工林经营管理技术等提供科学依据。【方法】以山东高唐旧城国有林场6 a不同水肥耦合处理下S86三倍体毛白杨(P. tomentosa)人工林为研究对象,设置3个灌溉水平(滴头正下方20 cm处土壤水势分别达到-20、-33和-45 kPa时灌溉,即W1、W2、W3)、4个施氮水平[施用量为120、190、260和0 kg/(hm²·a),即N1、N2、N3、N4]和对照(CK)共13个不同水肥耦合的处理。采用收获法以部分乔木层生物量建立生物量回归方程,并对乔木层生物量进行估算;采用收获法获得灌草层与凋落物层生物量,采集(0, 20]、(20, 40]、(40, 60]、(60,100] cm层土壤样品;测定植物与土壤碳含量,并根据碳含量与生物量估算碳密度与碳储量;估算灌溉施肥下森林经营碳消耗,得到生态系统净碳储量。【结果】经过6 a的水肥耦合处理,W1N1处理的乔木层碳储量显著大于CK处理(P<0.05),为51.58 t/hm²;灌草层碳储量占整个生态系统碳储量的0.15%~0.22%;凋落物层碳储量占生态系统碳储量的0.37%~0.46%,水肥耦合处理对凋落物层碳储量无显著影响;土壤有机碳储量在不同处理间差异显著(P<0.05),其中W1N3处理下最高(75.28 t/hm²)、CK处理下最低(54.74 t/hm²);W1N1(116.61 t/hm²)、W1N2(116.58 t/hm²)、W1N3(121.63 t/hm²)处理的系统碳储量均显著大于CK处理(P<0.05)。乔木层与土壤层碳储量之和占比超过99%,表明在杨树人工林生态系统中,乔木层与土壤层是最大的碳库。去除林业碳消耗后的生态系统净碳储量在W2N1、W2N2、W2N3与W3N3处理下相较CK处理有所减少,但仍显著大于CK处理。【结论】在华北平原沙地水肥耦合处理下,高水灌溉与任何施肥处理耦合均可显著促进杨树人工林生态系统碳储量与净碳储量的增多,对杨树人工林碳储量影响最大,有利于生态系统碳储量快速且稳定积累;建议促进华北平原沙地毛白杨人工林优化水肥管理技术及参数为灌溉阈值为-20 kPa下的施氮肥处理。

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.

导出引用

朱静伟, 贾黎明, 古丽米热·依力哈木, 等. 水肥耦合对S86三倍体毛白杨人工林碳储量的影响[J]. 南京林业大学学报（自然科学版）. 2025, 49(6): 151-161 https://doi.org/10.12302/j.issn.1000-2006.202403008

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

中图分类号： S718

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