引用本文:区晓琳,陈志彪,陈志强,陈海滨,任天婧.亚热带侵蚀红壤区植被恢复过程中土壤团聚体化学计量特征[J].土壤学报,2018,55(5):1156-1167.
OU Xiaolin,CHEN Zhibiao,CHEN Zhiqiang,CHEN Haibin,REN Tianjing.Stoichiometrc Characteristics of Soil Aggregates in Subtropical Eroded Red Soil under Vegetation Restoration[J].Acta Pedologica Sinica,2018,55(5):1156-1167
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亚热带侵蚀红壤区植被恢复过程中土壤团聚体化学计量特征
区晓琳,陈志彪,陈志强,陈海滨,任天婧
福建师范大学地理科学学院,福建师范大学地理科学学院,福建师范大学地理科学学院,福建师范大学地理科学学院,福建师范大学地理科学学院
摘要:
植被恢复过程中侵蚀退化地区土壤团聚体碳氮磷及其化学计量特征是反映土壤团聚体对养分固持能力以及土壤生物地球化学循环的关键环节,也是定量评价退化地植被恢复效应的重要途径。为深入了解侵蚀红壤植被恢复过程中土壤团聚体碳、氮、磷含量分配格局及其化学计量特征,以典型红壤侵蚀区福建省长汀县河田镇5个不同植被恢复年限的样地(分别为5 a、10 a、15 a、30 a、80 a)以及1个未治理地(恢复0 a)为对照坡地作为研究对象,测定0~20 cm和20~40 cm土层不同粒径团聚体有机碳、全氮、全磷含量,并分析土壤与不同粒径团聚体养分化学计量特征。结果表明:(1)植被恢复过程中,团聚体有机碳、全氮和全磷含量变化范围分别为2.06~27.71 g•kg-1、0.54~2.12 g•kg-1和0.034~0.189 g•kg-1,团聚体C:N、C:P、N:P变化范围分别为3.06~13.05、21.4~185.6、5.62~18.20。(2)随植被恢复年限增加,各粒级团聚体有机碳、全氮和全磷含量及其C:N总体上显著增加,均表现为表土层(0~20 cm)高于底土层(20~40 cm),团聚体C:P、N:P随植被恢复年限增加表现为升高→降低→升高趋势, 团聚体C:P随土层加深而降低,团聚体N:P在土层间明显变化。(3)除恢复0 a外,团聚体有机碳,全氮、全磷和团聚体C:N、C:P随粒径减小总体上呈增加趋势,N:P在各粒径间显著差异。(4) 土壤与团聚体中有机碳、全氮和全磷含量之间以及团聚体有机碳、全氮与团聚体C:N之间均呈极显著正相关;团聚体有机碳与团聚体C:P呈极显著正相关;团聚体全磷与团聚体N:P呈极显著负相关。植被恢复降低土壤侵蚀,明显增加各粒径团聚体有机碳、全氮和全磷含量,提高团聚体碳氮“汇”功能,且在植被恢复过程中,团聚体中P元素成为退化生态系统恢复的限制性元素。
关键词:  化学计量特征  团聚体养分  植被恢复  侵蚀红壤
DOI:10.11766/trxb201801300070
分类号:
基金项目:国家科技支撑计划项目(2013BAC08B03)和国家自然科学基金项目(41171232,41371512)
Stoichiometrc Characteristics of Soil Aggregates in Subtropical Eroded Red Soil under Vegetation Restoration
ouxiaolin,chenzhibiao,chenzhiqiang,chenhaibin and rentianjing
College of Geographical Sciences, Fujian Normal University,College of Geographical Sciences, Fujian Normal University,College of Geographical Sciences, Fujian Normal University,College of Geographical Sciences, Fujian Normal University,College of Geographical Sciences, Fujian Normal University
Abstract:
【Objective】This study was done to elucidate C, N and P distributions in soil aggregates and their stoichiometric characteristics in eroded red soil under vegetation restoration relative to history of the restoration. 【Method】Six sample plots were set up on slope lands of typical eroded red soil under vegetation restoration with different restoration history (0, 5, 10, 15, 30 and 80 years) located in Hetian Town, Changting County, Fujian Province of Subtropical China. Soil samples were collected from different soil layers (0~20 cm and 20~40 cm) of the six plots for analysis of contents of organic carbon, total nitrogen, total phosphorus in soil aggregates different in particle size (>5 mm, 2~5 mm, 0.5~1 mm, 1~2 mm, 0.25~5 mm and <0.25 mm). 【Result】 Results show that the contents of organic carbon, total nitrogen, total phosphorus in soil aggregates varied in the range of 2.06~27.71 g•kg-1, 0.54~2.12 g•kg-1 and 0.034~0.189 g•kg-1, respectively, and C:N, C:P and N:P did in the range of 3.06~13.05, 21.4~185.6 and 5.62~18.20, respectively. On the whole the contents of organic carbon, total nitrogen, total phosphorus and C:N increased in all fractions of soil aggregates in both soil layers with the restoration going on (P<0.05), and the trend was more significant in the 0~20 cm soil layer than in the 20~40 cm layer, while soil C:P and N:P displayed a rising-falling-rising trend, and . C:P deceased with soil depth, and N:P did not vary much. The contents of organic carbon, total nitrogen and total phosphorus, and C:N and C:P on the whole increased with the aggregates going down in particle size (P<0.05), except for the plot of 0 year, while N:P did not vary much with aggregate particle size (P>0.05). The content organic carbon, total nitrogen and total phosphorus in soil aggregates were remarkably positively related to their respective ones in the soil. In the soil aggregates the contents of organic carbon and total N positively related to C:N, the content of organic carbon was to C:P, and the content of total phosphorus was to N:P. 【Conclusion】All the findings in the study demonstrate that vegetation restoration mitigates soil erosion and significantly increases the contents of organic carbon, total nitrogen and total phosphorus and improves the function of soil aggregates as carbon and nitrogen pools, and what is more, P in the aggregates is the major factor restraining rehabilitation of the degraded ecosystem.
Key words:  Stoichiometric characteristics  Nutrients in soil aggregates  Vegetation restoration  Eroded red soil