摘要
文章对广西7个典型岩溶石山区(隆林各族自治县、凌云县、东兰县、河池市金城江区、罗城仫佬族自治县、融水苗族自治县和桂林市雁山区)、63个灌木林地样方土壤及环境因子进行取样和调查,研究典型岩溶区土壤和凋落物有机碳(C)、全氮(N)和全磷(P)的化学计量特征及其影响因素。结果表明:(1)研究区灌木林地0~40 cm土壤C、N、P平均值分别为31.90 g·kg^(-1)、3.95 g·kg^(-1)和2.65 g·kg^(-1),变异系数分别为40.13%、41.46%、65.24%;C/N、C/P、N/P平均值分别为8.10、14.82、7.80,变异系数分别为14.88%、48.78%和41.33%;0~20 cm土壤C/N、C/P、N/P值略高于20~40 cm土壤;0~20 cm和20~40 cm土壤C/N、C/P和N/P组间均存在显著差异;(2)土壤养分元素含量之间均存在极显著相关性,土壤养分元素生态化学计量特征与凋落物N、P含量显著正相关,与凋落物C/N显著负相关;土壤P含量与海拔显著正相关,土壤C/N与年平均气温呈负相关关系;年平均降水量与土壤C、P呈中等负相关关系;年平均气温与土壤C、C/N、C/P呈负相关关系,与土壤N呈正相关关系。广西岩溶区土壤和凋落物均具有低碳高磷的特征,凋落物氮、磷是影响岩溶灌丛土壤养分化学计量特征的重要因子,年均温升高会促进土壤N增加,降低土壤C/N,年均降水量增加会降低土壤C、P含量。
This study was conducted at seven typical karst areas(Longlin,Lingyun,Donglan,Hechi,Luocheng,Rongshui and Guilin)of Guangxi,China.These areas present subtropical monsoon climate,with annual temperatures averaging from 19.27℃to 20.73℃,and the annual rainfall averaging from 1,149.2 mm to 1,931.3 mm.This study focused on the stoichiometric characteristics and the influencing factors of organic carbon(C),nitrogen(N)and phosphorus(P)in soil and litter of typical karst areas.By field sampling and laboratory experiment,the stoichiometric characteristics of soil organic C,N,and P,and litter C,N and P of 63 shrub quadrats in the seven typical karst areas were investigated.Besides,the correlation between the variation in stoichiometric characteristics of soil and environmental factors were analyzed.The research findings show that:(1)the mean content of C,N and P in 0-40 cm soil was 31.90 g·kg^(-1),3.95 g·kg^(-1) and 2.65 g·kg^(-1),and the coefficient of variation was 40.13%,41.46%and 65.24%,respectively.The mean value of C/N,C/P and N/P was 8.10,14.82 and 7.80,and the coefficient of variation was 14.88%,48.78%and 41.33%,respectively.The values of C/N,C/P and N/P in 0-20 cm soil were slightly higher than those in 20-40 cm.There were significant differences in soil C/N,C/P and N/P between 0-20 cm and 20-40 cm(P>0.05).(2)There were significant correlations among the contents of soil C,N and P(P<0.01).The stoichiometric characteristics of soil nutrients elements were significantly affected by litter N and P(P<0.05)which was negatively correlated with the C/N ratio of litter.There was a moderately negative correlation between mean annual precipitation and soil C and P.However,the mean annual temperature was negatively correlated with soil C,C/N and C/P,which was positively correlated with soil N.The soil C,N and P of typical karst shrubland in Guangxi presents high spatial heterogeneity,with the characteristics of low C and high P,and the litter is characterized by low C,high P,low C/P and low N/P.Litter N and P is the i
作者
岳祥飞
李衍青
刘鹏
YUE Xiangfei;LI Yanqing;LIU Peng(Institute of Karst Geology,CAGS/Key Laboratory of Karst Dynamics,MNR&GZAR/International Research Center on Karst under the Auspices of UNESCO,Guilin,Guangxi 541004,China;National Center for International Research on Karst Dynamics System and Global Change,Guilin,Guangxi 541004,China;Pingguo Guangxi,Karst Ecosystem,National Observation and Research Station,Pingguo,Guangxi 531406,China;College of Environment and Resource,Guangxi Normal University,Guilin,Guangxi 541004,China;College of Forestry,Guangxi University,Nanning,Guangxi 530001,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2023年第5期1106-1116,共11页
Carsologica Sinica
基金
广西自然科学基金面上项目(2018GXNSFAA138172)
广西创新驱动发展专项资金项目(桂科AA20161004)
中国地质科学院基本科研业务费专项经费资助(2002372017007)
中国地质调查局地质调查项目(DD20230081)。
关键词
岩溶区
化学计量
土壤
凋落物
灌木林
karst area
stoichiometric characteristics
soil
litter
shrubland
