侵蚀红壤山地微地形条件下的芒萁土壤生态化学计量特征  

Ecological stoichiometry characteristics of Dicranopteris dichotoma Bernh.soil under the micro-topography in eroded red soil mountains

作　　者：陈海滨 李想[2] CHEN Hai-bin;LI Xiang(School of History and Geography,Minnan Normal University,Zhangzhou,Fujian 363000,China;National Park Research Center of Sanming University,Sanming,Fujian 365004,China)

机构地区：[1]闽南师范大学历史地理学院,福建漳州363000 [2]三明学院国家公园研究中心,福建三明365004

出　　处：《南方农业学报》2020年第6期1377-1383,共7页Journal of Southern Agriculture

基　　金：国家重点研发计划项目(2016YFC0502905);福建省教育厅中青年教师教育科研项目(JT180292);福建省矿山生态修复工程研究中心开放基金项目(MELCER20120893B170008)。

摘　　要：【目的】探索侵蚀红壤山地微地形条件下的芒萁(Dicranopteris dichotoma Bernh.)土壤生态化学计量特征,揭示芒萁侵入过程中所受到的主要营养元素限制因子,阐明生态恢复过程中芒萁对养分缺乏的适应特征,为红壤侵蚀区水土流失治理提供科学参考。【方法】采用野外调查与室内分析相结合的方法,运用生态化学计量原理对不同坡向(东、西、南、北)和坡位(上、中、下)的芒萁土壤碳(C)、氮(N)、磷(P)状况及比值进行研究。【结果】土壤有机C和全N含量在阴坡(东坡向和北坡向)相对高于阳坡(西坡向和南坡向),基本呈由下坡位向上坡位递减的变化趋势;全P含量在不同坡位间的变化趋势无明显规律,但处于阴坡的北坡向土壤全P含量相对高于处于阳坡的南坡向,北坡向土壤P含量并不匮乏。土壤C∶N在微地形条件下的变化趋势不明显,比值基本围绕25.00波动;土壤C∶P的变化范围幅度较大,在24.78~95.54,大体呈由下坡位向上坡位递减的变化趋势;土壤N∶P的变化范围在0.80~4.48,下坡位的比值均显著高于上坡位(P<0.05,下同)。土壤有机C含量与全N含量间呈极显著正相关(P<0.01,下同),二者均与C∶P、N∶P和地上生物量呈显著或极显著正相关,而全P含量与C、N、P化学计量比及生物量的相关性均不显著(P>0.05)。【结论】南方侵蚀红壤山地土壤在芒萁入侵的恢复阶段受N素限制作用较明显,尤其中上坡位受到N限制的作用更明显,一定程度造成土壤恢复过程缓慢。【Objective】This article aimed to describe the soil ecological stoichiometry characteristics of Dicranopteris dichotoma Bernh.in an eroded red soil mountainous micro-topography to disclose the nutrient limiting factors during its spreading,and how D.dichotoma adapted to nutrient deficiency during ecological restoration,and further provide scientific reference for the management of soil erosion in eroded red soil area.【Method】Based on the method of field investigation and lab analysis,ecological stoichiometry was used to analyze the carbon(C),nitrogen(N),and phosphorus(P)status and ratios at different aspects(east aspect,west aspect,south aspect,north aspect)and slope positions(upslope,mesoslope,downslope).【Result】The soil organic carbon and nitrogen content in shady slope(east and north)were higher than that in sunny slope(west and south).The content of organic C and total N decreased from downhill to uphill.The content of total phosphorus did not change obviously in different slopes.But total P content in the north slope was higher than that in the south slope,it was not deficient in the north slope.Under micro-topographic conditions,the soil C∶N did not change too much which was fluctuating around 25.00.However,the C∶P was ranging from 24.78 to 95.54 and showed a decreasing trend from downhill to uphill.The N∶P was between 0.80 and 4.48,and that of downhill was significantly higher than that of uphill(P<0.05,the same below).There was extremely significant positive correlation between the contents of soil organic C and total N(P<0.01,the same below),both were significantly or extremely positively correlated with C∶P,N∶P and above-ground biomass,while the total P content was insignificantly correlated with C,N,P stoichiometric ratios and biomass(P>0.05).【Conclusion】The soil in eroded red soil mountainous areas of southern China is greatly restricted by nutrients during the recovery phase of D.dichotoma invasion,especially the N-limited effect in the mesoslope and upslope,which causes the

关 键 词：芒萁 侵蚀红壤区 微地形 生态化学计量学 

分 类 号：S158.3[农业科学—土壤学]