土地利用方式对纳帕海湿地土壤碳氮储量的影响

doi:10.13292/j.1000-4890.202406.036

生态学杂志 ›› 2024, Vol. 43 ›› Issue (6): 1720-1727.doi: 10.13292/j.1000-4890.202406.036

土地利用方式对纳帕海湿地土壤碳氮储量的影响

李文韬^1,2,胡尊英⁴,张昆^1,2,李丽萍^1,2,仇玉萍^1,2,郭雪莲^3*

（¹云南省高原湿地保护修复与生态服务重点实验室，昆明 650224； ²西南林业大学湿地学院，昆明 650224； ³浙江科技学院环境与资源学院，杭州 310023； ⁴浙江省生态环境监测中心，杭州 310012）

出版日期:2024-06-10 发布日期:2024-06-18

Effects of land-use types on soil carbon and nitrogen stocks in the Napahai wetlands.

LI Wentao^1,2, HU Zunying⁴, ZHANG Kun^1,2, LI Liping^1,2,QIU Yuping^1,2, GUO Xuelian^3*

(¹Yunnan Key Laboratory of Plateau Wetland Conservation, Restoration and Ecological Services, Kunming 650224, China; ²College of Wetlands, Southwest Forestry University, Kunming 650224, China; ³School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China; ⁴Zhejiang Provincial Ecological Environment Monitoring Center, Hangzhou 310012, China).

Online:2024-06-10 Published:2024-06-18

摘要/Abstract

摘要： 近年来，受气候变化和人为活动的影响，滇西北高原湿地土地利用方式发生了改变。然而，关于土地利用方式对滇西北高原湿地土壤碳、氮储量的影响及机制尚不明确。本研究选取纳帕海的湿地、草甸和耕地为对象，分析不同土地利用方式和不同土层深度土壤有机碳（TOC）、全氮（TN）含量和储量的变化特征，阐明不同土地利用方式土壤碳、氮储量与生物量和土壤理化性质之间的耦合关系，探讨纳帕海土地利用方式对土壤碳氮储量影响的机制及主控因子。结果表明：湿地土壤的含水率、TOC、TN含量、地上生物量和地下生物量均显著高于耕地和草甸(P<0.05)，容重则显著低于耕地和草甸(P<0.05)。0~100 cm土层深度，湿地、耕地和草甸土壤碳、氮储量总体上均随土层深度的增加而减少，湿地土壤碳、氮储量均最高，草甸碳、氮储量均最低。土壤有机碳储量与TOC、碳氮比、地上生物量均呈显著正相关（P<0.01）；土壤全氮储量与含水率、TOC、TN、地上生物量均呈显著正相关（P<0.01），与容重、碳氮比呈显著负相关（P<0.05）。土地利用方式、含水率、容重和TOC含量直接影响土壤碳储量，土壤深度、土地利用方式、碳氮比和TN含量直接影响土壤氮储量。综上，容重、含水率、碳氮比、地上生物量和地下生物量是影响纳帕海土壤碳、氮储量的主要因素，土壤碳和氮储量均表现为湿地＞耕地＞草甸，表明湿地排水疏干变为草甸或开垦为耕地，将导致纳帕海土壤碳和氮的损失。

关键词: 土地利用方式, 土壤碳储量, 土壤氮储量, 纳帕海

Abstract: Land-use patterns in the wetlands of northwest Yunnan Plateau have undergone changes due to climate change and human activities. However, the impacts and mechanisms of these land-use changes on soil carbon and nitrogen stocks in the wetlands remain unclear. In this study, we analyzed the changes in soil organic carbon (TOC) and total nitrogen (TN) contents and stocks under different land-use types (wetlands, meadows, and croplands) of Napahai. Our aims were to elucidate the relationship between soil carbon and nitrogen stocks, plant biomass, and soil physicochemical properties under different land-use types, and to clarify the influencing mechanisms of land-use types on soil carbon and nitrogen stocks and main controlling factors. The results showed that soil moisture, TOC, TN content, aboveground biomass, and belowground biomass were significantly higher in wetlands than in croplands and meadows (P<0.05), while bulk density was significantly lower in wetlands (P<0.05). Soil carbon and nitrogen stocks in wetlands, croplands, and meadows decreased with increasing soil depth (0-100 cm). Carbon and nitrogen stocks were the highest in wetland soil, and the lowest in meadow soil. Soil organic carbon stocks showed a significant positive correlation with TOC content, carbon-nitrogen ratio, and aboveground biomass (P<0.01). Soil total nitrogen stocks were positively correlated with soil moisture, TOC and TN contents, and aboveground biomass (P<0.01), while negatively correlated with bulk density and carbon-nitrogen ratio (P<0.05). Land-use type, soil moisture, bulk density, and TOC content directly affected soil carbon stocks, while soil depth, land-use type, carbon-nitrogen ratio, and TN content directly affected soil nitrogen stocks. In summary, bulk density, soil moisture, carbon-nitrogen ratio, aboveground biomass, and belowground biomass were identified as the main factors affecting soil carbon and nitrogen stocks in Napahai wetlands. The carbon and nitrogen stocks in the soil of Napahai wetlands were highest in wetlands, followed by croplands and meadows, indicating that drainage of wetlands into meadows or conversion of wetlands into croplands will result in carbon and nitrogen losses in the soil of Napahai wetlands.

Key words: land-use type, soil carbon stock, soil nitrogen stock, Napahai wetland

李文韬, 胡尊英, 张昆, 李丽萍, 仇玉萍, 郭雪莲. 土地利用方式对纳帕海湿地土壤碳氮储量的影响[J]. 生态学杂志, 2024, 43(6): 1720-1727.

LI Wentao, HU Zunying, ZHANG Kun, LI Liping, QIU Yuping, GUO Xuelian. Effects of land-use types on soil carbon and nitrogen stocks in the Napahai wetlands.[J]. Chinese Journal of Ecology, 2024, 43(6): 1720-1727.

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土地利用方式对纳帕海湿地土壤碳氮储量的影响

Effects of land-use types on soil carbon and nitrogen stocks in the Napahai wetlands.

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