| 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 |
|
| 摘要点击次数: 1145 |
| 全文下载次数: 589 |
| 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. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |