白一茹,张兴,包维斌,王幼奇,赵云鹏.黄土丘陵区不同土地利用方式土壤碳氮磷及其生态化学计量特征[J].干旱地区农业研究,2019,37(4):117~123
黄土丘陵区不同土地利用方式土壤碳氮磷及其生态化学计量特征
The soil carbon, nitrogen, and phosphorus contents and their stoichiometry under different land uses in loess hilly region
  
DOI:10.7606/j.issn.1000-7601.2019.04.16
中文关键词:  土地利用方式  土壤碳、氮、磷  化学计量  环境因子  典型相关分析
英文关键词:land use mode  soil carbon, nitrogen and phosphorus  stoichiometry  environmental factor  canonical correlation analysis
基金项目:国家自然科学基金(41761049,41867003);宁夏高等学校项目(NGY2017015);宁夏自然科学基金(2018AAC03027);宁夏重点研发计划重大项目(2018BFG02016);宁夏青年科技人才托举工程项目
作者单位
白一茹 College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China 
张兴 College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China 
包维斌 College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China 
王幼奇 College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China 
赵云鹏 College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China
China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions, Yinchuan, Ningxia 750021, China 
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中文摘要:
      以陕北米脂谷子、苜蓿、柠条和枣树4种不同土地利用方式土壤为研究对象,采集0~100 cm土层土壤样品,采样数共288个,分别对样品土壤的C、N、P及其生态化学计量比C/N、C/P和N/P进行了研究。结果表明:黄土丘陵区土壤C、N、P含量均值分别为2.12、0.21 g·kg-1和0.43 g·kg-1;C/N、C/P和N/P均值分别为10.83、5.0和0.48;土壤C、N、P及C/N、C/P和N/P的变异系数均大于10%且小于100%,属于中等变异。土地利用方式对土壤C、N、P含量及其生态化学计量特征有显著影响,其中谷子地0~20 cm土层土壤C含量显著高于柠条地和枣树林(P<0.05),谷子地20~40 cm土层的C含量显著高于苜蓿地(P<0.05);0~20、20~40 cm和60~80 cm土层谷子地N含量显著高于柠条地(P<0.05);苜蓿地P含量在0~20、60~80 cm和80~100 cm土层显著高于柠条地(P<0.05)。谷子地、苜蓿地和枣树林土壤C、N呈表聚性分布,而柠条地随深度增加无明显降低,表明柠条有较好的固碳能力。各土层C/N在不同土地利用方式间存在显著差异(P<0.05),其中柠条地最高,谷子地最低;80~100 cm土层土壤C/P在柠条地和苜蓿地间具有显著差异(P<0.05)。0~20 cm和20~40 cm土层深度下,土壤N/P在不同土地利用方式之间具有显著差异(P<0.05),其中谷子地最高,柠条地最低。通过典型相关分析得出,土壤C、N、C/P和N/P与环境因子中的土层深度、粘粒含量和土壤pH值的累积关系较大。
英文摘要:
      Land use change will break the balance of carbon (C), nitrogen (N), phosphorus (P) in ecosystem, thus affecting the mineralization, transportation, absorption and utilization of C, N, and P elements in soil. There were 288 soil samples collected from the 0~100 cm soil layer in millet, alfalfa, caragana, and jujube land to study soil C, N, and P contents and their stoichiometry of C/N, C/P, and N/P. The results showed that the average soil C, N, and P contents were 2.12, 0.21 g·kg-1 and 0.43 g·kg-1, respectively, which indicated poor nutrient status. The mean values of soil C/N, C/P, and N/P were 10.83, 5.0, and 0.48, respectively. Variation coefficients of SOC, TN, TP, C/N, C/P, and N/P were between 10% and 100%, indicating moderate variation. The results showed that land use had remarkable effect on soil C, N, P, C/N, C/P, and N/P. The 0~20 cm soil C content of millet land was significantly higher than that of jujube and caragana land (P<0.05). The 20~40 cm soil C content of millet land was significantly higher than that of alfalfa land (P<0.05). The soil N contents of 0~20, 20~40, and 60~80 cm layers of millet land were significantly higher than that of caragana land (P<0.05). The soil P contents of 0~20, 60~80, and 80~100 cm layers from alfalfa land were significantly higher than that of caragana land (P<0.05). The soil C and N of jujube, alfalfa, and millet land tended to distribute in surface soil. The soil C and N of caragana land scarcely decreased as the soil depth increased, which indicated high ability of carbon fixation capacity. There were significant differences in C/N among different land uses (P<0.05) with highest value in caragana land soil and the lowest value in millet land. The C/P under 80~100 cm soil layer was significantly different between caragana land and alfalfa land (P<0.05). There were significant differences for 0~20 and 20~40 cm N/P among different land uses (P<0.05) with the highest value in millet land and the lowest value in caragana land. The canonical correlation analysis showed that soil C, N, C/P, and N/P were significantly related to environmental factors such as soil depth, clay content, and soil pH.
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