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title: 哀牢山亚热带常绿阔叶林土壤呼吸特征及其对模拟增温的响应
Other Title: Characteristics of soil respiration and their responses to simulated warming in a subtropical evergreen broad-leaved forest in Ailao Mountains, SW China
author: 武传胜
Advisor: 张一平;  梁乃申;  沙丽清
Issued Date: 2016-11
Keyword: 土壤呼吸组分,土壤有机碳排放,土壤增温,土壤移植,交互作用,
Major: 生态学
Abstract: 土壤是陆地生态系统中最大的有机碳库,土壤有机碳排放的微弱变化都会对
全球碳循环产生重要影响。森林土壤有机碳排放在区域及全球尺度碳循环中扮演
重要角色,因此在全球变暖的背景下,区分森林土壤呼吸组分并探究森林土壤有
机碳排放对土壤温度升高的响应具有重要的意义。
本研究利用大型多点自动开闭箱式土壤呼吸连续测定系统,通过设置对照
(CK)、去凋落物处理(NL)、切根处理(NR),揭示哀牢山亚热带常绿阔叶林
土壤呼吸特征(如动态、数值及各组分所占的比例);在切根的基础上,设置红
外辐射器增温处理(NRW),揭示该森林异养呼吸对土壤温度升高的响应。同时
利用人工观测,通过设置对照、去凋落物处理、切根处理、切根并去凋落物处理
(NRNL),探究该森林凋落物分解与根际活动的交互作用,并通过设置对照与切
根处理下的凋落物分解实验,探究根际活动对凋落物分解的激发效应,并尝试新
的方法区分土壤呼吸组分;利用海拔梯度的增温效应,移植该森林的土壤(NRNL)
到中低海拔处,以揭示该森林土壤有机碳基础呼吸(RSOC)对不同土壤升温幅度
的响应。
本研究得到以下主要结果:
(1)哀牢山亚热带常绿阔叶林土壤呼吸年均总量为13.80 tC∙ha–1∙yr–1,季节
动态明显,其中大部分碳排放发生在5 ~ 10 月的雨季(占全年的72.1 %);模型
回归及逐步回归(前进法)分析呈现了土壤温度对土壤呼吸的主控作用及土壤水
分的调节作用;表明气候变化将引起土壤呼吸的发生变化,并将对森林碳循环产
生重大影响。
(2)当区分土壤呼吸为地表部分凋落物呼吸(RAL)与地下部分呼吸(RNL)
时,RNL > RAL;当区分土壤呼吸为自养呼吸(RA)与异养呼吸(RH)时,RH > RA。
RNL 与RH 是土壤有机碳排放占主导地位的土壤碳排放,显示土壤有机碳排放在
土壤呼吸中占有重要位置。
(3)异养呼吸在土壤呼吸中占有很大的比例,未考虑切根处理引起的土壤
水分变化,异养呼吸为土壤呼吸的74.4 %;考虑土壤水分变化,经模型校正后,
异养呼吸为土壤呼吸的70.2 %;由此表明通过人工处理区分土壤呼吸组分时也
改变了土壤微环境,会造成土壤呼吸区分的偏差,因此需要采用回归模型进行校
正。
(4)增温处理后,土壤温度平均升高了2.2 ℃,异养呼吸速率增加了17.1 %;
四年(2011 ~ 2014)观测期内异养呼吸多排放了7.02 tC∙ha–1,平均每年多排放
哀牢山亚热带常绿阔叶林土壤呼吸特征及其对模拟增温的响应
II
1.76 tC∙ha–1;表明气候变暖会增加土壤有机碳排放。增温处理后,土壤水分平均
降低了5.1 %(m3 / m3),经模型校正后,消除土壤水分变化的影响,使得异养呼
吸速率增加了20.7 %;观测期内异养呼吸多排放了7.98 tC∙ha–1,土壤水分的降低
补偿了0.96 tC∙ha–1。异养呼吸的增温效应主要受土壤温度增温幅度的影响,土壤
移植实验结果表明:土壤有机碳基础呼吸最适增温幅度是0 ~ 5.1 ℃。表明气候
变暖及降雨格局变化将共同影响着未来土壤有机碳的排放。
(5)哀牢山亚热带常绿阔叶林凋落物分解和根际活动间具有显著的正交互
作用,土壤呼吸组分区分为:土壤有机碳基础呼吸(RSOC)、凋落物呼吸(RL),
根呼吸(RR)和交互作用(RINT),其贡献率分别为:46 %、9 %、15 %和30 %。
根际活动对凋落物分解有显著的激发效应,提高了92 %的凋落物分解速率;土
壤呼吸组分重新区分为:土壤有机碳排放(RSOC-total)、凋落物分解(RL-total)和根
呼吸(RR),其贡献率分别为:68 %、17 %和15 %。可见土壤有机碳排放在土壤
呼吸的比重大,在森林碳循环中扮演重要角色。
以上结果表明气候变暖会增大土壤有机碳的排放速率,未来气候变暖会加速
亚热带森林土壤有机碳向大气中的释放。本研究的结果可为进一步研究气候变暖
等全球变化对土壤呼吸组分尤其是土壤有机碳排放的影响提供经验和理论基础。
关键词:土壤呼吸组分,土壤有机碳排放,土壤增温,土壤移植,交互作用,
激发效应,全球变暖。
English Abstract: 

Soil is the largest organic carbon pool in the terrestrial ecosystem, therefore, little
variation of soil organic carbon (SOC) efflux will have a significant impact on global
carbon cycle. Forest SOC efflux plays an important role on regional and global carbon
cycle, so it has important meaning to investigate the response of forest SOC efflux to
soil warming under global warming.
In present study, values of soil respiration and its components’ contributions in the
forest were quantified, according to treatments of control (CK), litter removal (NL) and
trenching (NR) treatments, and warming treatment was done based on trenching
treatment (NRW) by infrared radiator to understand the response of heterotrophic
respiration to soil warming in the forest, based on multichannel automated chamber
system for continuous measurement of soil respiration. Based on artificial measurement,
the interaction effect of litter decomposition and rhizosphere activities was investigated,
according to a two-factor plus two-level experiment design of litter and root, with four
treatments of control, litter removal, trenching and trenching together with litter
removal (NRNL) treatments. Priming effect of rhizosphere activity on litter
decomposition was also investigated according to litter decomposition experiments
under CK and NR treatments, respectively, and thereby soil respiration was
repartitioned combined above two researches. In order to known responses of SOC
basic respiration of the forest to different soil warming ranges, soil cores were
transplanted into middle and low elevations based on warming effect of elevation.
The main results are as follows:
(1) In this forest, soil respiration had significant seasonal variation with a large mean
value of 13.80 tC∙ha–1∙yr–1, and the most part (72.1 % of the annual mean) of soil
respiration occurred in rainy seasons (May to October). Model regressions and stepwise
regression (forward method) analyses showed that soil respiration was controlled by
soil temperature and regulated by soil water content. Those suggest climate change will
bring variation of soil respiration and thereby will have a significant impact on carbon
cycle in the forest.
(2) When partition soil respiration into surface litter respiration (RAL) and
belowground respiration (RNL), RNL > RNL; when partition soil respiration into
autotrophic respiration (RA) and heterotrophic respiration (RH), RH > RA. RNL and RH

are conducted by soil organic carbon efflux, which suggest soil organic carbon efflux
play an important role on soil respiration.
(3) Heterotrophic respiration accounted a large proportion in soil respiration. It
accounted for 74.4 % without considering soil water content change due to trenching
treatment, and accounted for 70.2 % after corrected from regression model considering
soil water content change. This suggests treatments for soil respiration partition will
bring changes of soil microenvironment and thereby causes bias on soil respiration
partition, therefore, it is need to correct data by model regression.
(4) After soil warming treatment, soil temperature increased by 2.2 ℃, which
induced an increasing of heterotrophic respiration by 17.1 %. Heterotrophic respiration
fluxed more carbon by 7.02 tC∙ha–1, with an average of 1.76 tC∙ha–1∙yr–1 in the fouryear
(2011 ~ 2014) measurement period. This suggests global warming will accelerate
soil organic carbon efflux. After soil warming treatment, soil water content decreased
by 5.1 % (m3/m3), according to correction by regression model considering the
decreasing of soil water content due soil warming, heterotrophic respiration increased
by 20.7 %. In the four-year measurement period, heterotrophic respiration fluxed more
carbon by 7.98 tC∙ha–1, and the decreasing of soil water content compensated carbon
efflux by 0.96 tC∙ha–1. Warming effect on heterotrophic respiration was controlled by a
range of increased soil temperature and SOC basic respiration (RSOC) had a suitable
range of increased soil temperature by 0 ~ 5.1 ℃ concluded from soil transplantation
experiments. Those suggest global warming and rainfall change will affect soil organic
carbon efflux corporately in the future.
(5) There existed significant interaction between litter decomposition and
rhizosphere activities on soil respiration in the forest. Soil respiration was partitioned
into SOC basic respiration (RSOC), litter respiration (RL), root respiration (RR) and the
interaction (RINT), which accounted for 46 %, 9 %, 15 % and 30 %, respectively. Soil
temperature and soil water content both can affect the interaction, and soil water content
had a larger effect. Rhizosphere activities had significant priming effect on litter
decomposition, increased litter decomposition by 92 %. Soil respiration was
repartitioned into SOC efflux (RSOC-total), litter decomposition (RL-total), root respiration
(RR), which accounted for 68 %, 17 % and 15 %, respectively. Therefore, soil organic
carbon efflux accounts a larger proportion on soil respiration and plays an important
role on forest carbon cycle.
The results above suggest that global warming will accelerate soil carbon efflux and
future warming in subtropical forests can accelerate release of soil organic carbon to
the atmosphere. This study can afford theoretical basis on the effect of global change
such as climate warming on soil respiration components, especially on SOC efflux, in
the future studies.
Key words: soil respiration components, soil organic carbon efflux, soil warming,
soil transplantation, interaction effect, priming effect, global warming. 

Degree Level: 博士
Place of Degree's Grantor: 北京
Grantor: 中国科学院研究生院
Content Type: 学位论文
URI: http://ir.xtbg.org.cn/handle/353005/10292
Language: 中文
Appears in Collections:西双版纳热带植物园毕业生学位论文_学位论文

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Recommended Citation:
武传胜. 哀牢山亚热带常绿阔叶林土壤呼吸特征及其对模拟增温的响应[D]. 北京. 中国科学院研究生院. 2016.
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