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雷州半岛不同林龄桉树人工林土壤碳氮磷 和易氧化有机碳的特征∗
张振源1, 顾晓娟1, 吴妙兰1, 何普林2, 王忠林2, 徐其贤2, 周庆1, 莫其锋1
1.华南农业大学林学与风景园林学院;2.中林集团雷州林业局有限公司
摘要:
为研究林龄对桉树人工林土壤碳 (C)、 氮 (N)、 磷 (P) 等养分含量和易氧化有机碳 (ROC) 的影响及其垂直变化规律, 分析林龄对人工林土壤生态化学计量特征和碳稳定性的影响, 以雷州半岛不同林 龄 (7 a 生和 12 a 生) 尾叶桉 Eucalyptus urophylla 人工林为研究对象, 根据土层深度按 0 ~ 10 cm、 10 ~ 20 cm、 20~40 cm、 40~60 cm 和 60~100 cm 共 5 个层次分别采集土壤样品并测定土壤养分与有机碳含量。 结果 显示: (1) 12 a 生尾叶桉人工林土壤 ROC、 总有机碳 (TOC)、 总氮 (TN) 和总磷 (TP) 比 7 a 生分别高 72. 64%、 114. 07%、 225. 69%和 14. 41%, 说明尾叶桉人工林土壤 TOC 含量和养分水平随着林龄的增加而提 高; (2) 12 a 生尾叶桉人工林表层土壤 (0~10 cm) 的 ROC/ TOC 显著大于 7 a 生 (P<0. 05), 说明前者表 层土壤的碳稳定性较低; 而 12 a 生尾叶桉底层土壤 (20~60 cm) 的 ROC/ TOC 值对比 7 a 低 36. 85%, 说明 12 a 生人工林底层土壤碳稳定性高于 7 a; (3) 相关性分析结果表明, 两种林龄人工林土壤 TOC 与 TN、 速 效磷 (AP) 和 C/ P 呈显著正相关, 且 7 a 生和 12 a 生人工林土壤 TOC 还分别受到 TP 和 N/ P 的显著影响。 土壤 ROC 与 TN、 C/ P 呈显著正相关, 其中 7 a 生和 12 a 生土壤 ROC 还分别受到 TP、 AP 和 N/ P 的显著影 响, 表明 7 a 生尾叶桉人工林土壤有机碳含量和碳稳定性受到土壤 P 元素供应的影响更大。 此外, 12 a 生人 工林土壤 ROC/ TOC 受到 TN 和 N/ P 的显著影响, 表明 12 a 生尾叶桉人工林则更容易受到土壤 TN 含量的 控。 因此, 在雷州半岛地区, 适当延长桉树人工林的轮伐周期, 并根据不同林龄改善土壤的氮磷养分供应 调 水 平, 有利于提高雷州半岛桉树人工林土壤的碳封存潜力。
关键词:  易氧化有机碳  土壤化学计量  尾叶桉  林龄  雷州半岛
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基金项目:广东省林业科技创新项目 (2022KJCX015、 2022KJCX017)
Characteristics of Soil Carbon, Nitrogen, Phosphorus and Easily Oxidized Organic Carbon in Eucalyptus Plantations with Different Ages in Leizhou Peninsula
Zhang Zhenyuan1, Gu Xiaojuan1, Wu Miaolan1, He Pulin2, Wang Zhonglin2, Xu Qixian2, Zhou Qing1, Mo Qifeng1
1.College of Forestry and Landscape Architecture, South China Agricultural University;2.China Forestry Group Leizhou Forestry Bereau Co., Ltd
Abstract:
To investigate the impact of stand age on soil nutrient content carbon (C), nitrogen ( N), phosphorus (P), etc. , and readily oxidizable carbon (ROC) in Eucalyptus plantations, we analyzed the ecological stoichiometry and C stability of soils at different depths in two Eucalyptus urophylla plantations (7 years and 12 years old) in the Leizhou Peninsula. Soil samples were collected at five layers, 0-10 cm, 10-20 cm, 20-40 cm, 40-60 cm, and 60-100 cm, for analyzing soil nutrient content and organic C. The results showed that: (1) ROC, total organic C (TOC), total N (TN), and total P (TP) of Eucalyptus urophylla plantation with 12 a were 72. 64%, 114. 07%, 225. 69%, and 14. 41% higher than those with 7 a, respectively, indicating that the soil TOC content and nutrient concentration of E. urophylla plantation increased with the increase of stand age. (2) The ROC/ TOC of the surface soil (0-10 cm) of E. urophylla plantation with 12 a was significantly higher than that with 7 a (P<0. 05), indicating that the soil C stability of 12 a plantation was lower, while the ROC/ TOC of the bottom soil (20-60 cm) of E. urophylla with 12 a was 36. 85% lower than that with 7 a, suggesting that the C stability of 12 a was higher than that of 7 a. (3) The correlation analysis showed that there was a significant positive correlation between soil TOC and TN, available P (AP), C/ P in two plantations, and the soil TOC of 7 a and 12 a plantations was also significantly affected by TP and N / P; respectively. Soil ROC showed a significant positive correlation with TN and C/ P, and 7 a and 12 a plantations were also significantly affected by TP, AP and N / P, respectively, indicating that the TOC content and C stability of 7 a were more affected by the supply of soil P elements. In addition, soil ROC/ TOC of 12 a plantation was significantly affected by TN and N / P. The results show that the TOC content and C stability of 12 a were more easily regulated by soil TN content. Therefore, appropriately extending the rotation cycle of Eucalyptus plantations and improving the soil N and P supply levels according to different stand ages are conducive to improving the soil C sequestration potential of Eucalyptus plantations in the Leizhou Peninsula.
Key words:  readily oxidized carbon  soil stoichiometry  Eucalyptus urophylla  stand ages  Leizhou Peninsula