引用本文: | 吴 丹, 温 晨, 卫 伟, 张钦弟.黄土高原小流域不同植物群落土壤生态化学计量的垂直变化特征[J].广西植物,2023,43(5):923-935.[点击复制] |
WU Dan, WEN Chen, WEI Wei, ZHANG Qindi.Vertical variation characteristics of soil ecological stoichiometry of different plant communities in small watershed on the Loess Plateau[J].Guihaia,2023,43(5):923-935.[点击复制] |
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黄土高原小流域不同植物群落土壤生态化学计量的垂直变化特征 |
吴 丹1, 温 晨1, 卫 伟2, 张钦弟1*
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1. 山西师范大学 生命科学学院, 太原 030031;2. 中国科学院生态环境研究中心 城市与区域生态国家重点实验室, 北京 100085
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摘要: |
在黄土高原生态恢复重建过程中,土壤养分及化学计量特征是评价黄土区植被恢复效应的有效途径。该文以典型半干旱黄土小流域3种恢复方式下(天然荒草、自然恢复、人工恢复)的5种植物群落(长芒草群落、赖草群落、苜蓿群落、柠条群落、山杏群落)不同深度的土壤(0~20 cm、20~40 cm、40~60 cm)为研究对象,利用方差分析及线性回归法分析土壤有机碳(SOC)、全氮(TN)、全磷(TP)、全钾(TK)含量及化学计量比的垂直变化特征,并探讨各指标间的耦合关系。结果表明:(1)群落类型和土壤土层深度对土壤SOC、TN、TP含量均有显著影响,土层深度还显著影响土壤TK的分布,但两者交互作用只对TN含量有显著影响。0~20 cm土层中,土壤SOC、TN含量表现为柠条灌丛显著高于长芒草、赖草、苜蓿和山杏群落(P<0.05)。(2)在土壤垂直剖面上,除C:N随土层加深而增加外,其他土壤化学计量比均随土层加深而逐渐降低。在0~20 cm和20~40 cm的土层中,土壤C:N表现为赖草群落显著高于长芒草、苜蓿、柠条和山杏群落(P<0.05),而土壤C:P、N:P、N:K均表现为人工恢复柠条群落最高; 在40~60 cm的土层中,山杏土壤C:K显著低于长芒草、赖草、苜蓿和柠条群落(P<0.05)。(3)不同群落土壤SOC、TN、TP、TK含量彼此间呈正相关关系,其中,SOC含量与TN含量、TN含量与TP含量、SOC含量与TP含量、TN含量与TK含量在5种植物群落中均达到显著正相关(P<0.05)。土壤C:P与C:K、C:K与N:K、N:P与N:K间均具显著正相关关系(P<0.05),C:N与N:P、C:N与N:K、P:K与C:P、P:K与N:P间均呈负相关关系。综合来看,不同植物群落土壤SOC、TN、TP、TK含量均随土层加深而逐渐降低,人工恢复柠条生态化学计量特征综合更强,更有利于改善当地土壤质量。 |
关键词: 黄土小流域,植被恢复,土壤养分,垂直分布,生态化学计量 |
DOI:10.11931/guihaia.gxzw202106050 |
分类号:Q948.113 |
文章编号:1000-3142(2023)05-0923-13 |
基金项目:山西省回国留学人员科研资助项目(2021-097); 山西省基础研究计划(20210302123333); 国家自然科学基金(41971129)。 |
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Vertical variation characteristics of soil ecological stoichiometry of different plant communities in small watershed on the Loess Plateau |
WU Dan1, WEN Chen1, WEI Wei2, ZHANG Qindi1*
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1. College of Life Sciences, Shanxi Normal University, Taiyuan 030031, China;2. State Key Laboratory of Urban and Regional Ecology,
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
1. College of Life Sciences, Shanxi Normal University, Taiyuan 030031, China; 2. State Key Laboratory of Urban and Regional Ecology,
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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Abstract: |
Soil nutrients and their stoichiometric characteristics are effective ways to evaluate the effect of vegetation restoration in small watersheds on the Loess Plateau. The study aims to analyze different soil depths(0-20 cm、20-40 cm、40-60 cm)of Stipa bungeana community, Leymus secalinus community, Medicago sativa community, Caragana korshinskii community, and Armeniaca sibirica community in three restoration types(natural grass, natural restoration, manual restoration). The vertical variation characteristics of soil organic carbon(SOC), total nitrogen(TN), total phosphorus(TP), total potassium(TK)contents. Their ecological stoichiometry was analyzed utilizing variance analysis and linear regression, and the coupling relationship among each index was discussed. The results were as follows:(1)Soil SOC, TN, TP contents were affected by different communities, and soil depth affected soil SOC, TN, TP and TK contents, but only TN content was affected by their interaction. In the 0-20 cm soil layer, soil SOC and TN contents in Caragana korshinskii shrub were significantly higher than those in other communities(P<0.05).(2)In the vertical soil profile, except for C:N, the soil stoichiometric ratios decreased gradually with soil depth deepening. In the soil layers of 0-20 cm and 20-40 cm, except for the soil C:N which was the highest in Leymus secalinus community(P<0.05), the soil C:P, N:P and N:K were all the highest in Caragana korshinskii community; In the 40-60 cm soil layer, the soil C:K of the Armeniaca sibirica community was significantly lower than other communities(P<0.05).(3)Soil SOC, TN, TP and TK contents were positively correlated under different communities. Among them, SOC and TN contents, TN and TP contents, SOC and TP contents, TN and TK contents reached significant levels in the five communities(P<0.05). In different communities, there was a significant positive correlation between soil C:P and C:K, C:K and N:K, N:P and N:K(P<0.05), while there was a negative correlation between C:N and N:P, C:N and N:K, P:K and C:P, P:K and N:P. To sum up, soil SOC, TN, TP and TK contents in different communities gradually decrease with the soil depth deepening. The comprehensive ecological stoichiometry characteristics of the Caragana korshinskii community are more substantial, more conducive to improving the local soil quality. |
Key words: loess watershed, vegetation restoration, soil nutrient, vertical distribution, ecological stoichiometry |
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