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[1]刘长红,袁野,杨君,等.稻田改为旱地后土壤有机碳矿化及微生物群落结构的变化[J].应用与环境生物学报,2015,21(05):960-966.[doi:10.3724/SP.J.1145.2015.01050]
 LIU Changhong,YUAN Ye,YANG Jun,et al.Variation in soil organic carbon mineralization and microbial community structure induced by the conversion from double rice fields to drained fields[J].Chinese Journal of Applied & Environmental Biology,2015,21(05):960-966.[doi:10.3724/SP.J.1145.2015.01050]
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稻田改为旱地后土壤有机碳矿化及微生物群落结构的变化()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
21卷
期数:
2015年05期
页码:
960-966
栏目:
研究论文
出版日期:
2015-10-25

文章信息/Info

Title:
Variation in soil organic carbon mineralization and microbial community structure induced by the conversion from double rice fields to drained fields
作者:
刘长红 袁野 杨君 戴晓琴 王辉民
1湖南农业大学资源环境学院 长沙 410128 2中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室千烟州生态试验站 北京 100101 3江西省区域生态过程与信息重点实验室 泰和 343725
Author(s):
LIU Changhong YUAN Ye YANG Jun DAI Xiaoqin WANG Huimin
1College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China 2Qianyanzhou Ecological Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 3Jiangxi Provincial Key Laboratory of Ecosystem Processes and Information, Taihe 343725, China
关键词:
土地利用变化土壤有机碳矿化微生物群落磷脂脂肪酸
Keywords:
land use change soil organic carbon mineralization microbial community structure phospholipid fatty acid
分类号:
S153 + S154.3
DOI:
10.3724/SP.J.1145.2015.01050
文献标志码:
A
摘要:
土地利用变化是驱动陆地与大气之间碳迁移变化的主要因素,为正确评估土地利用方式变化后土壤有机碳固持和稳定性,对南方双季稻田(RR)改为玉米-玉米(MM)和大豆-花生(SP)2年后土壤化学性质、有机碳矿化及微生物群落结构的变化进行研究. 结果表明,RR改为MM和SP后,土壤pH值显著降低(0.50-0.52,P = 0.002),而可溶性有机碳显著提高(23%-35%,P = 0.016). 土壤有机碳的矿化速率没有显著变化,但在培养13 d后SP累积矿化量显著降低(P = 0.019). 稻田改旱地后,土壤微生物总磷脂脂肪酸(PLFAs)、细菌、革兰氏阳性菌(G+)、革兰氏阴性菌(G-)和放线菌PLFAs显著降低(P < 0.05),而真菌PLFAs/细菌PLFAs(F/B)显著增加(P = 0.006),但改MM和SP没有显著差异. 培养初期,土壤放线菌PLFAs与累积碳矿化显著相关(P = 0.034),土壤F/B与培养13 d累积碳矿化显著相关(P = 0.004),而土壤微生物群落主成分分析的PC1(P = 0.014)和总的PLFAs(P = 0.033)与培养108 d累积碳矿化显著相关. 本研究发现稻田改旱地后土壤pH和总氮含量是影响土壤微生物群落结构和生物量进而影响土壤有机碳矿化的关键因素.
Abstract:
Land use conversion is an important factor influencing the carbon gas exchange between land and atmosphere. The effect of land use conversion on soil organic carbon mineralization and microbial function is important for soil organic carbon sequestration and stability. This research studied the effects of land use conversion on soil chemical properties, organic carbon mineralization and microbial community structure after two years of conversion from double rice cropping (RR) to maize-maize (MM) and soybean-peanut (SP) double cropping systems in southern China. The results showed that soil pH significantly decreased by 0.50 (MM) and 0.52 (SP, P = 0.002), and dissolved organic carbon significantly increased by 23%-35% (P = 0.016). No significant difference was found in soil organic carbon mineralization rate with the land use conversion, though the accumulated mineralization decreased after 13 days of incubation (P = 0.019). Land use conversion from paddy to upland significantly changed soil microbial community structure. The total PLFAs, bacterial, gram-positive bacterial (G+), gram-negative bacterial (G-) and actinomycetic PLFAs decreased significantly (P < 0.05), the ratio of fungal PLFAs to bacterial PLFAs (F/B) increased significantly (P = 0.006). But no significant differences in microbial groups were found between MM and SP. The accumulated mineralization at the beginning period of the incubation were significantly positively correlated with soil actinomycetic PLFAs (P = 0.034). After 13 days of incubation, soil F/B showed a positive correlation with the accumulated mineralization (P = 0.004). However, soil microbial community structure(P = 0.014)and total PLFAs(P = 0.033)showed a positive correlation with the accumulated mineralization after 108 days of incubation. Our results indicated that after conversion from paddy soils to drained soils, soil pH and total nitrogen are the key factors regulating the variations in soil microbial community structure and biomass, and then influencing soil organic carbon mineralization.

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备注/Memo

备注/Memo:
国家重点基础研究发展计划项目(2012CB417103)和国家自然科学基金项目(41001179)资助 Supported by the State Key Basic Research and Development Program of China (973 Program, 2012CB417103) and the National Natural Science Foundation of China (41001179)
更新日期/Last Update: 2015-10-29