摘要
为了阐明土地利用方式转变对土壤碳、氮、磷及其化学计量特征的影响,以粤北低山区4种土地利用方式:自然林地、坡地果园、旱作梯田和稻作梯田为研究对象,探索20年生林地向梯田转变后土壤有机碳(OC)、全氮(TN)和全磷(TP)的含量、储量及化学计量变化特征。结果表明:土地利用转变明显改变了土壤碳、氮、磷含量和化学计量特征,随着土壤深度增加,旱作梯田和稻作梯田OC、TN含量呈显著下降趋势,自然林地和坡地果园呈"V"字型变化趋势,4种土地利用方式TP变化趋势不明显。土壤剖面OC含量以稻作梯田最高,均值为12.36 g·kg^(-1),其次为林地(10.32 g·kg^(-1))和旱作梯田(8.80 g·kg^(-1)),坡地果园最低(5.96 g·kg^(-1));TN含量表现为稻作梯田(1.01 g·kg^(-1))>旱作梯田(0.78 g·kg^(-1))>林地(0.66 g·kg^(-1))>坡地果园(0.33 g·kg^(-1));TP含量以旱作梯田(0.71 g·kg^(-1))最高,坡地果园(0.22 g·kg^(-1))最低。4种土地利用方式土壤C∶N为8.87~22.94,以坡地果园土壤最高;C∶P为8.73~81.74,N∶P为0.77~5.13,均以林地土壤最高。土地利用方式、土壤深度及两者交互作用显著影响土壤碳、氮、磷及其化学计量特征,而土壤容重、pH值和黏粒含量也是重要的影响因素。研究结果可为粤北低山林地的土地利用和梯田生态系统的合理施肥提供科学依据。
To examine the effects of land use change on soil stoichiometry,we selected four kinds of land use soils in northern Guangdong:forest land(FL),sloping orchard(SO),dry land terraces(DLT)and paddy terraces(PT)to explore the changes of the contents,stocks and stoichiometry of organic carbon,nitrogen and phosphorus in the 20 a process of transforming from forest land into terraced land.Results showed that land use significantly changed the contents and stoichiometric characteristics of soil carbon,nitrogen and phosphorus.With the increase of soil depth,organic carbon(OC)and total nitrogen(TN)contents of DLT and PT decreased significantly,while FL and SO showed a"V"-shaped change trend.There was no difference in total phosphorus(TP)content among the four land use types.The OC content of PT was the highest,with an average value of 12.36 g·kg^(-1),followed by FL(10.32 g·kg^(-1))and DLT(8.80 g·kg^(-1)),while SO was the lowest(5.96 g·kg^(-1)).TN content was decreased in order of PT(1.01 g·kg^(-1))>DLT(0.78 g·kg^(-1))>FL(0.66 g·kg^(-1))>SO(0.33 g·kg^(-1)).TP content of DLT(0.71 g·kg^(-1))was the highest,and SO(0.22 g·kg^(-1))was the lowest.C:N was between 8.87 and 22.94,and SO was the highest.C:P was between 8.73 and 81.74,N:P was between 0.77 and 5.13,with both of which being the highest in FL.Land use,soil depth and their interaction significantly affected the contents,stocks,and stoichiometric ratio of soil carbon,nitrogen and phosphorus,with soil bulk density,pH,and clay content as important influencing factors.The research results could provide a scientific basis for land use of subtropical low mountain forest land and rational fertilization of terraced ecosystems.
作者
王超
董玉清
卢瑛
李博
唐贤
邱竞驰
胡家帅
WANG Chao;DONG Yu-qing;LU Ying;LI Bo;TANG Xian;QIU Jing-chi;HU Jia-shuai(College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China;Key Laboratory of Arable Land Conservation in South China,Ministry of Agriculture and Rural Affairs,Guangzhou 510642,China;Guangdong Province Key Laboratory of Land Use and Consolidation,Guangzhou 510642,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2021年第7期2440-2448,共9页
Chinese Journal of Applied Ecology
基金
国家自然科学基金-广东省联合基金集成项目(U1901601)
国家科技基础性工作专项重点项目(2014FY110200)资助。
关键词
土地利用
梯田
碳氮磷
化学计量特征
land use
terrace
carbon
nitrogen and phosphorus
stoichiometric characteristics
