湛江红树林湿地不同淹水梯度下土壤养分及其化学计量特征  

Soil Nutrients and Stoichiometry Along Different Flooding Gradients in the Zhanjiang Mangrove Wetland

作　　者：陈玉军[1] 李婷 朱立安 林梓 陈粤超 李玫[1] 贾桐 张会化 CHEN Yu-jun;LI Ting;ZHU Li-an;LIN Zi;CHEN Yue-chao;LI Mei;JIA Tong;ZHANG Hui-hua(Research Institute of Tropical Forestry,Chinese Academy of Forestry,Guangzhou 510520,Guangdong,China;Institute of Eco-Environmental and Soil Sciences,Guangdong Academy of Sciences,National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China,Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management,Guangzhou 510650,Guangdong,China;Zhanjiang Mangrove Reserve Administration,Zhanjiang 524088,Guangdong,China;School of Food Science and Engineering,Foshan University,Foshan 528000,Guangdong,China)

机构地区：[1]中国林业科学研究院热带林业研究所,广东广州510520 [2]广东省科学院生态环境与土壤研究所,华南土壤污染控制与修复国家地方联合工程研究中心,广东省农业环境综合治理重点实验室,广东广州510650 [3]广东湛江红树林国家级自然保护区管理局,广东湛江524088 [4]佛山科学技术学院食品科学与工程学院,广东佛山528000

出　　处：《西北林学院学报》2023年第5期19-27,共9页Journal of Northwest Forestry University

基　　金：广东省重点领域研发计划项目(2020B020214001);国家自然科学基金(41771232);海南省自然科学基金项目(421RC658);广东省科学院项目(2019GDASYL-0104014)。

摘　　要：明确不同淹水时间下红树林土壤养分和生态化学计量特征的空间异质性,可揭示环境变化对土壤元素组成的调控和反馈作用,为科学利用海岸潮间带土壤提供依据。通过野外调查与室内试验分析,研究湛江红树林湿地不同淹水时间下土壤C、N、P、K含量与生态化学计量特征。结果表明,低潮位土壤盐度与有机碳、N、P、K含量均显著(P<0.05)低于高潮位,降幅分别为78.5%、89.4%、79.4%、54.2%和31.5%。随着淹水时间的增加,土壤可溶性N、碱解N、速效P和速效K分别减少83.1%、79.6%、82.7%和53.8%。土壤C∶N、C∶P、C∶K、N∶P均表现为高潮位>中高潮位>中潮位>低潮位>中低潮位,其比值分别为48.00~117.20、1.00~6.47、0.08~0.65、0.02~0.06,属弱变异,N是研究区土壤限制性养分因子。冗余分析表明,溶解性有机碳是影响生态化学计量比变化的关键环境因子,可解释其81.1%的变化率。淹水时间的变化对湛江红树林湿地表层土壤养分及其化学计量特征变化产生了显著影响,随淹水时间的增加土壤质量总体呈衰退态势,建议可适当增加研究区湿地土壤N元素供给以改善土壤质量,促进红树植树造林及生长。Clarification of the spatial heterogeneity of soil nutrients and stoichiometry under different flooding conditions in mangroves is helpful to revealing the responses of soil process to environmental changes and provides a basis for soil management in coastal intertidal zones.We conducted field investigation of the contents of soil organic C,N,P,K and stoichiometry under different intertidal zones in Zhanjiang mangrove wetland.Soil salinity and the contents of soil organic C,N,P,K in low-intertidal zones were significantly(P<0.05)lower than those of high-intertidal zones,with values in low-intertidal zones 78.5%,89.4%,79.4%,54.2%and 31.5%lower than those in high-intertidal zone,respectively.With the increase of flooding time,soil dissolved organic C,alkaline hydrolyzed N,available P and available potassium decreased by 83.1%,79.6%,82.7%and 53.8%,respectively.Soil C∶N,C∶P,C∶K and N∶P showed the same trends along intertidal zones:high-intertidal>mid-climax-intertidal>mid-intertidal>low-intertidal>midlow-intertidal,and the ratios ranged between 48.00-117.20,1.00-6.47,0.08-0.65 and 0.02-0.06,respectively.Soil C∶N,C∶P,C∶K and N∶P showed moderate variations and N was the limiting nutrient in the study site.Redundancy analysis showed that dissolved organic C was the key influencing factor of stoichiometric ratios,accounted for 81.1%of total variation.The flooding time had a significant effect on soil nutrients and stoichiometric ratios,and soil fertility decreased with the increase of flooding time.The results suggest to increase the supply of nitrogen for the improvement of soil quality and the promotion of mangrove afforestation and growth.

关 键 词：生态化学计量学 淹水时间 红树林 土壤养分 变异系数 

分 类 号：S714.8[农业科学—林学]