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[1]和润莲 闫帮国** 孙毅 何光熊 史亮涛.植物种和氮添加对元谋干热河谷草地土壤有机碳分解的影响[J].应用与环境生物学报,2021,27(04):1-13.[doi:10.19675/j.cnki.1006-687x.2020.08030]
 HE Runlian,YAN Bangguo*,SUN Yi,et al.Effects of plant species and nitrogen addition on soil organic carbon decomposition in the Yuanmou dry- hot valley grassland , China[J].Chinese Journal of Applied & Environmental Biology,2021,27(04):1-13.[doi:10.19675/j.cnki.1006-687x.2020.08030]
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植物种和氮添加对元谋干热河谷草地土壤有机碳分解的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
27卷
期数:
2021年04期
页码:
1-13
栏目:
研究论文
出版日期:
2021-08-25

文章信息/Info

Title:
Effects of plant species and nitrogen addition on soil organic carbon decomposition in the Yuanmou dry- hot valley grassland , China
作者:
和润莲12 闫帮国12** 孙毅12 何光熊12 史亮涛12
1云南省农业科学院热区生态农业研究所 云南元谋 651300
2元谋干热河谷植物园 云南元谋 651300
Author(s):
HE Runlian12 YAN Bangguo12* SUN Yi12 HE Guangxiong12 SHI Liangtao 12
1Institute of Tropical Eco-agricultural Sciences, Yunnan Academy of Agricultural Sciences, Yuanmou 651300, China
2Yuanmou Dry-hot Valley Botanical Garden, Yuanmou 651300, China
关键词:
植物氮添加活性碳惰性碳分解干热河谷
Keywords:
plant N addition active carbon resistant carbon decomposition arid-hot valley
DOI:
10.19675/j.cnki.1006-687x.2020.08030
摘要:
为了解植物生长和氮(N)添加对元谋干热河谷区草地上土壤活性炭组分和惰性碳组分分解的影响,在元谋干热河谷典型燥红土上开展植物物种和氮添加实验,分析不同物种(扭黄茅(Heteropogon contortus)、橘草(Cymbopogon goeringii)、孔颖草(Bothriochloa pertusa)、拟金茅(Eulaliopsis binata)),和氮(N)添加对干热河谷区草地土壤有机碳分解的影响。结果表明:(1)相较于裸地,植物着生后土壤全碳(TC)、全氮(TN)含量以及土壤C:N增加;土壤微生物含量增加,土壤活性炭组分和惰性碳组分分解速率显著升高。(2)N添加后土壤中微生物呼吸速率、微生物代谢熵以及惰性碳组分分解速率均不同程度的降低。(3)双因素方差分析表明,N添加和不同植物种对碳分解均有显著影响,但两者交互作用对碳分解速率的影响不显著。土壤活性碳和惰性碳组分分解速率与土壤TC、TN、土壤pH值、微生物生物量、植物生物量、土壤真菌以及细菌生物量显著相关。以上研究结果可以为认识植被恢复和氮沉降背景下干热河谷土壤碳循环提供一定的理论基础,同时为干热河谷土壤生态系统功能恢复和调控提供科学依据。(图4表2参33)
Abstract:
In order to investigate the effects of plant growth and nitrogen (N) addition on the decomposition of active carbon and inactive carbon components in the Yuanmou dry-hot valley grassland, a field manipulation experiment was conducted on rhodoxeralfs soil s in an arid-hot valley of Jinsha River from 2013 to 2015, with a factorial treatment of plants and nitrogen addition. Plant treatments includ ed bare plots and 4 grass species (including Heteropogon contortus, Bothriochloa pertusa, Cymbopogon goeringii and Eulaliopsis binata) with 10 replications. The halves of plots received N addition (5 g m -2 a -1) with the other halves as control. The effects of treatment on aboveground biomass, soil chemical properties were analyzed by using univariate ANOVA. Two-way ANOVA analysis of the effects of nitrogen addition, plant species and their interactions on carbon decomposition parameters was carried . Their relationships were investigated by the correlation analysis of the general linear regression model. The results showed that (1) The total carbon (TC), total nitrogen (TN), soil C:N and soil microbial contents were significantly higher in vegetation plots compared with those in bare plots. Similarly, the decomposition rate of active carbon components and inactive carbon components were significantly higher in vegetation plots than those in bare plots; (2) The respiration rate, metabolic quotient and decomposition rate of inactive carbon components of soil microorganisms decreased after N addition; (3) Two-way ANOVA results showed that both N addition and plant species had significant effects on carbon decomposition, with no significant interactions. Soil carbon decomposition parameters were significantly correlated with soil total C, total N, soil pH value, microbial PLFAs, plant biomass, soil fungi biomass and bacteria biomass. The above conclusions can improve our understanding of the changes in soil carbon cycle under vegetation restoration and nitrogen deposition in dry-hot valleys.

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备注/Memo

备注/Memo:
收稿日期 Received: 2020-08-20 接受日期 Accepted: 2020-09-30
云南省重点研发计划项目(2019BC001)和国家自然科学基金项目(41471232)资助
**通讯作者 Corresponding author (E-mail: yanbangguo@aliyun.com )
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更新日期/Last Update: 2020-10-05