摘要
探讨湘西北石漠化区阔叶林、针阔混交林、针叶林和灌木丛4种典型植被类型各土层土壤有机C、全N和全P及其土壤化学计量特征的变化规律。结果表明:1)4种植被类型土壤有机C、全N和全P的含量均随土层深度的加深而下降,不同植被类型土壤有机C和全P均表现为:阔叶林>针阔混交林>针叶林>灌木丛。2)阔叶林和针阔混交林0～20 cm土壤有机C比灌木丛分别高出了158.98%和64.87%;土壤全N和全P含量的变异系数较小,仅为0.26和0.21,属弱变异,在4中植被类型和不同土层间,其值比较稳定。3)不同植被类型土壤C/N和C/P均表现为:阔叶林>针阔混交林>灌木丛>针叶林,其中阔叶林和针阔混交林0～20cm土壤C/N显著高于针叶林和灌木丛,分别高出了132.98%和92.72%;土壤C/P和N/P的值较稳定,变异幅度较小,变异系数仅为0.23和0.25,属弱变异。4)相关性分析表明,土壤有机C和全P与土壤化学计量比具有较强的正相关性,土壤C/N与有机C和全P具有显著正相关关系,土壤C/P与土壤有机C具有极显著正相关关系,土壤N/P与土壤有机C和全P具有显著负相关关系。5)主成分分析表明,阔叶林对土壤有机C、全N和全P及其化学计量比的影响最为显著。
The change rules of soil organic C,total N and total P and soil stoichiometric characteristics of four typical vegetation types (broad-leaved forest,coniferous and broad-leaved mixed forest,coniferous forest and shrub) were studied in the rocky desertification area of northwestern Hunan.The results show as follows:1) The contents of organic C,total N and total P in the four types of soils decreased with the deepening of the soil depth,the soil organic C and P in different vegetation type forests ranked as broad-leaved forest > needle width mixed forest > coniferous forest > shrubs.2) The soil organic C of broad-leaved forest and coniferous and broadleaved mixed forest were 158.98% and 64.87% higher than that of shrub,respectively;The variation coefficients of soil total N and total P content were only 0.26 and 0.21,which was a weak mutation,among four vegetation types and different soil layers,the two values were relatively stable.3) The soil C/N and C/P in different vegetation types showed the same tread as broad-leaved forest > coniferous and broad-leaved mixed forest > shrub > coniferous forest;of the four forests,the soil C/N contents of in 0-20 cm soil layer of broadleaved forest and coniferous and broad-leaved mixed forest were significantly higher than those of coniferous forest and shrub,being 132.98% and 92.72% over the coniferous forest respectively;the soil C/P and N/P values were relatively stable,the variation value were small,and the variation coefficients were only 0.23 and 0.25,being weak variation.4) Correlation analysis shows that there were strong positive correlations between soil organic C and soil stoichiometry,and total P and soil stoichiometry;soil C/N had significant positive correlations with organic C and total P,and soil C/P had a significant positive correlation with soil organic C;soil N/P had significant negative correlation with soil organic C and total P.5) The effects of broadleaf forest on soil organic C,total N and total P and their stoichiometry were the most significant.
作者
刘兴锋
刘思凡
蒋龙
何功秀
LIU Xingfeng;LIU Sifan;JIANG Long;HE Gongxiu(Forestry Scientific Research Institute of Xiangxi Autonomous Prefecture,Jishou 416000,Hunan,China;College of Forestry,Central South University of Forestry and Technology,Changsha 410004,Hunan,China;Laboratory of Soil and Water Conservationand Desertification Control,Central South University of Forestry and Technology,Changsha 410004,Hunan,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2019年第2期72-78,共7页
Journal of Central South University of Forestry & Technology
基金
中央财政林业科技推广示范资金项目"桤木人工林生态系统可持续经营技术推广(XT-14)
湖南省教育厅重点项目"闽楠人工林土壤DOM动态及其对凋落物分解的响应机制"(17A226)
关键词
植被类型
阔叶林
针阔混交林
针叶林
土壤元素
土壤化学计量特征
石漠化地区
湘西北
vegetation types
broad-leaved forest
coniferous and broad-leaved mixed forest
coniferous forest
soil elements
soil stoichiometric characteristics
rocky desertification area
northwestern Hunan
