摘要
对贵州草海湿地4种水位梯度下(农田区、过渡区、浅水区和深水区)表层土壤(0~10 cm)碳、氮、磷含量及其生态化学计量比进行研究,以期揭示草海湿地不同水位梯度下土壤碳、氮、磷生态化学计量比的分布特征及其影响因素.结果表明:土壤总有机碳(TOC)、总氮(TN)及总磷(TP)含量在不同水位梯度之间均差异显著,由过渡区至深水区,土壤TOC及TN含量均呈递增趋势,而TP含量呈先降低后增加的趋势;农田区土壤TN含量显著高于浅水区,但深水区土壤TP含量显著低于农田区.不同水位梯度土壤碳氮比(C/N)、碳磷比(C/P)和氮磷比(N/P)也存在显著差异,由过渡区至深水区,土壤C/P和N/P均呈递增趋势,而C/N呈先增加后降低的趋势;与过渡区相比,农田区土壤C/N、C/P和N/P总体偏低.相关性分析表明:土壤C/N、C/P和N/P的空间分布与土壤TOC、TN、含水量等理化性质有关.可见,草海湿地水位变化对土壤TOC、TN和TP含量以及C/N、C/P及N/P的空间分布具有显著影响,且水位升高有利于增强土壤碳、氮、磷的固存潜力.
Top soils(0-10 cm)were collected along a water gradient in three sampling belts in Caohai wetland of Guizhou Province,including agricultural areas,transition areas,shallow-water areas and deep-water areas.Soil total organic carbon(TOC),total nitrogen(TN),total phosphorous(TP)and their ecological stoichiometry in different water levels were measured to investigate their horizontal distribution patterns,as well as their influencing factors.Our results showed that the difference of TOC,TN and TP contents were significant in four water gradients.The soil TOC and TN contents gradually increased from the transition areas to the deep-water areas,while the TP content firstly decreased and then increased.The soil TN content in agricultural areas were significantly higher than that in the shallow-water areas,but TP content in the deep-water areas were significantly lower than that in the agricultural areas.The difference of soil C/N,C/P and N/P ratios were significant in four water levels.The soil C/P and N/P ratios gradually increased from the transition areas to the deep-water areas,while the C/N ratios firstly increased and then decreased.Compared with the transition areas,the soil C/N,C/P,and N/P ratios in the agricultural areas were lower.Correlation analysis showed that the spatial distribution of soil C/N,C/P and N/P ratios were related to soil physical and chemical properties such as TOC,TN and water content.In summary,the hydrology significantly affects the spatial distribution of soil TOC,TN,TP,C/N,C/P and N/P ratios in Caohai wetland,and the accumulation of soil carbon and nitrogen will be enhanced when the water level rises.
作者
杨羽
夏品华
林陶
严定波
宋旭
马莉
汤向宸
YANG Yu;XIA Pinhua;LIN Tao;YAN Dingbo;SONG Xu;MA Li;TANG Xiangchen(:Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment of Guizhou Province,Guizhou Normal University,Guiyang 550001,P.R.China;Plateau Wetland Ecology and Environment Research Center,Guizhou Normal University,Guiyang 550001,P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2020年第1期164-172,共9页
Journal of Lake Sciences
基金
国家自然科学基金项目(41867056)
贵州省重大科技专项课题(20163022-2)
贵州师范大学博士基金项目联合资助
关键词
水位梯度
生态化学计量比
贵州草海湿地
Water level gradient
ecological stoichiometry
Guizhou Caohai wetland
