Soil stoichiometry and carbon storage in long-term afforestation soil affected by understory vegetation diversity
Soil stoichiometry and carbon storage in long-term afforestation soil affected by understory vegetation diversity
复制标题
林下植被多样性影响长期造林土壤的土壤化学计量和碳储量
DOI：
10.1016/j.ecoleng.2014.11.010
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发表时间：
2015-01-01
影响因子：
3.8
通讯作者：
Ren, Guangxin
中科院分区：
文献类型：
--
作者：
Zhao, Fazhu;Kang, Di;Ren, Guangxin
废弃地的造林可以为土壤有机碳(SOC)的固定提供机会，促进营养元素的循环，改善林下植物的多样性，并提供生态系统服务。本研究的目的是在长期造林的黄土高原地区，确定林下植物多样性，量化土壤有机碳和总氮(TN)储量的变化，评估土壤有机碳、全氮和总磷(TP)的化学计量学指标，并探讨它们之间的关系。在30年生刺槐林地及邻近废弃地的0~200 cm土层采集土壤样品，测定不同土层土壤有机碳、全氮和总磷的含量。此外，还对林下植物组成和多样性进行了评价。结果表明，长期造林的植被盖度、密度、丰富度指数(R)和Shannon-Wiener多样性(H)均大于荒地群落(P<；0.05)。绿化地土壤表层(0~30 cm)和下垫层(100 Cm)的土壤有机碳、全氮和全磷含量均显著高于相应的荒地(P<；0.05)。同时，绿化区土壤有机碳、全氮和总磷的化学计量比均高于荒地，且与林下植被多样性显著相关(P<；0.05)。此外，在0-30 cm和100-200 cm土层，长期植树造林的土壤有效地增加了土壤有机碳和全氮的储量，并且与林下植被多样性显著相关(P<；0.05)。这些结果表明，植树造林不仅影响表层土壤的有机碳和全氮储量，而且对深层土壤的有机碳和全氮储量也有很大的影响。长期植树造林对土壤R-CN、R-CP和R-NP比值有较大影响。(C)2014爱思唯尔B.V.保留所有权利。
The afforestation of abandoned land could offer opportunities to sequester soil organic carbon (SOC), promote nutriment elements cycling, improve plant diversity in the plantation understory and provide ecosystem services. The objectives of this study were to identify plant diversity in the plantation understory, quantify the changes in SOC and total nitrogen (TN) storage in deep soil, assess the SOC, TN, and total phosphorus (TP) stoichiometries, and investigate their relationships in the Loess Plateau Region (LPR) undergoing long-term afforestation. Soil samples were collected at a soil depth of 0-200 cm under 30-yr old Robinia pseudoacacia L. and adjacent abandoned sites, and SOC, TN and TP were determined in different soil depth. Additionally, plant composition and diversity in the plantation understory were evaluated. The results showed that land subjected to long-term afforestation had greater plant coverage, plant density, richness index (R) and Shannon-Wiener diversity (H) compared to abandoned land communities (P < 0.05). SOC, TN and TP contents in afforested sites were significantly increased in surface soil (0-30 cm) as well as in the underlying soil (100 cm) compared to the corresponding abandoned land sites (P < 0.05) in most cases. Meanwhile, SOC, TN, and TP stoichiometry in afforested areas were higher than those of abandoned lands and significantly related to understory vegetation diversity (P< 0.05). In addition, lands subjected to long-term afforestation effectively increased SOC and TN storages compared to abandoned land at soil depths of 0-30 cm and 100-200 cm and were also significantly related to understory vegetation diversity (P< 0.05). These findings demonstrating that afforestation not only affects SOC and TN stocks in surface soil, but also strongly influences that in deep soil. And it is also indicating that long-term afforestation could greatly affect soil R-CN, R-CP, and R-NP ratios. (C) 2014 Elsevier B.V. All rights reserved.