封育措施下荒漠草原针茅植物-土壤C、N、P化学计量特征  

C,N and P ecological stoichiometry characteristics of a Stipa species plant-soil system subject to grazing exclusion in a desert steppe

作　　者：万芳 蒙仲举 党晓宏 王瑞东 张慧敏 WAN Fang;MENG Zhong-ju;DANG Xiao-hong;WANG Rui-dong;ZHANG Hui-min(Desert Science and Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China;Wind Erosion Key Laboratory of Central and Government, Hohhot 010018, China;Inner Mongolia Hangjin Desert Ecological Position Research Station, Ordos 017400, China)

机构地区：[1]内蒙古农业大学沙漠治理学院,内蒙古呼和浩特010018 [2]中央与地方共建风沙物理重点实验室,内蒙古呼和浩特010018 [3]内蒙古杭锦荒漠生态系统国家定位观测研究站,内蒙古鄂尔多斯017400

出　　处：《草业学报》2020年第9期49-55,共7页Acta Prataculturae Sinica

基　　金：内蒙古中部荒漠草原微斑块发育与土壤优先流响应机制(51769019);中央引导地方科技发展专项资金内蒙古荒漠化防治创新研究中心资助。

摘　　要：以内蒙古希拉穆仁典型荒漠草原封育措施(完全封育、季节封育)下优势植物短花针茅及克氏针茅为研究对象,通过测定其叶片、枯落物和土壤C、N、P含量及化学计量特征,分析封育措施下两种针茅养分变化特征及养分限制因素。结果表明:1)两种针茅叶片及枯落物C、N、P含量均表现为完全封育>季节封育,土壤N含量为完全封育(2.54 g·kg^-1)<季节封育(2.75 g·kg^-1);2)两种针茅植物叶片C/N、C/P表现为季节封育>完全封育(P<0.05),说明完全封育降低了两种植物的固碳能力,土壤C/N与C/P均表现为完全封育(6.03、39.80)>季节封育(4.92、36.58)且差异显著(P<0.05);3)不同封育措施两种针茅叶片N/P>16,说明封育下两种针茅植物在研究区内主要受P的限制。研究结果进一步为荒漠草原可持续恢复管理提供科学指导。This research was conducted at Xilamuren in Inner Mongolia on typical desert steppe grassland dominated by Stipa breviflora and Stipa krylovii with the objective of defining the C,N,and P stoichiometry of leaves,litter and soil under two management regimes(year-round grazing exclusion and seasonal grazing exclusion).It was found that:1)The content of C,N and P in the leaves and litter in year-round exclusion were all greater than in the seasonal exclusion,while the content of soil N in year-round exclusion(2.54 g·kg^-1)was less than that in the seasonal exclusion(2.75 g·kg^-1).2)The C∶N and C∶P ratios of the leaves in seasonal exclusion was greater than that in the year-round exclusion,which showed that the carbon sequestration ability of the two grasses was reduced under year-round exclusion.However,the soil C∶N and C∶P ratios in seasonal exclusion(4.92 and 36.58,respectively)were less(P<0.05)than those in year-round exclusion(6.03 and 39.80,respectively).3)The N∶P ratio of leaves were typically greater than 16.Therefore,this is an obvious indication that the two grasses studied were mainly restricted by lack of P at the study site.These results provide scientific data assist decisions on the sustainable recovery management of the desert grassland.

关 键 词：叶片 枯落物 土壤 生态化学计量 希拉穆仁荒漠草原 

分 类 号：G63[文化科学—教育学]