峡谷型喀斯特不同生态系统土壤养分及其生态化学计量特征  

Soil Nutrients and Ecological Stoichiometry Characteristics under Different Ecosystems in Karst Canyon Region

作　　者：谭秋锦[1,2,3] 宋同清[2,3] 曾馥平[1,2,3] 彭晚霞[2,3] 杨钙仁[1] 杜虎[2,3] 

机构地区：[1]广西大学林学院,广西南宁530004 [2]中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,湖南长沙410125 [3]中国科学院环江喀斯特生态系统观测研究站,广西环江547100

出　　处：《农业现代化研究》2014年第2期225-228,共4页Research of Agricultural Modernization

基　　金：中国科学院战略性先导科技专项(编号:XDA05070404;XDA05050205);中国科学院西部行动计划项目(编号:KZCX2-XB3-10);国家科技支撑计划(编号:2011BAC09B02);国家自然科学基金项目(编号:31370485;31370623;U1033004和31100329);广西科技攻关项目(编号:桂科攻1123001-9C);广西特聘专家等项目共同资助

摘　　要：结合野外调查与室内分析,对峡谷型喀斯特水田(ST)、旱地(HD)、草地(CD)、灌丛(GC)、人工林(RGL)、次生林(CSL)6类生态系统进行研究,探讨不同生态系统土壤养分及其生态化学计量特征。结果表明:(1)除全钾含量外,6类生态系统土壤养分含量均随土层增加而减少,土壤pH与之相反;(2)与全球不同生态系统土壤的平均水平相比,峡谷型喀斯特不同生态系统的碳氮比、碳磷比、碳钾比、磷钾比和氮磷比均较低;(3)不同生态系统土壤养分含量差异显著,不同生态系统的化学计量差异也显著,土壤肥力的总体趋势为次生林>人工林>水田>旱地>灌丛>草地。不同发展阶段、不同生态系统土壤养分的限制因子不同,应制定不同的管理和施肥措施,促进峡谷型喀斯特乃至整个西南喀斯特区域植被的迅速恢复和生态重建。To explore soil nutrients and their ecological stoichiometry characteristics under six ecosystems including farmland （ST）, dry land （HD）, grassland （CD）, shrubbery （GC）, plantation （RGL） and secondary forest （CSL））, were studied in karst canyon region by a combination of field investigation and laboratory analysis. The results showed that： （1） soil nutrient content under six ecosystems had a decreasing trend with soil depth except total potassium （TK）, while the verse was true for soil pH. （2） Compared with the global soil average level, the ratios of carbon to nitrogen, carbon to phosphorus, carbon to potassium, phosphorus to potassium, and nitrogen to phosphorus ratio in six ecosystems were low in the karst canyon region. （3） Both soil nutrients contents and stoichiometry significantly differed among six ecosystems and soil fertility presented in the order of secondary forest 〉 plantation 〉 farmland〉 dry land 〉 shrubbery 〉 grassland. The main influencing factors varied at different developing stages and under different ecosystems; thus, respective management and fertilization measures should be adopted to promote vegetation restoration and rapid ecological reconstruction in the karst canyon region and even the whole southwest karst area of China.

关 键 词：土壤养分 生态系统 峡谷型喀斯特 生态化学计量学 

分 类 号：S158[农业科学—土壤学]