ISWC OpenIR  > 水保所知识产出(1956---)
宁夏农田生态系统碳源/ 汇特征
李明瑞
Subtype硕士
Thesis Advisor赵世伟
2014-05
Degree Grantor中国科学院研究生院
Place of Conferral北京
Keyword农田生态系统 农田生态系统,宁夏 碳源/汇 碳足迹 碳汇经济效益
Abstract

本文以宁夏农田生态系统作为研究对象,分析了北部引黄灌区、中部台地半干
旱带、南部黄土丘陵区三个区域农田生态系统碳吸收总量,碳排放总量,碳吸收强
度,碳足迹,碳源/汇的现状以及动态变化,比较不同区域间的差异及差异产生的原
因;同时计算了各区域农田生态系统碳汇的社会经济效益并拟合出碳足迹投入成本
与碳汇社会经济效益价值之间的关系曲线,计算出最优碳足迹成本投入和碳汇价值
的产出。主要研究结果如下:
整个宁夏农田生态系统均为碳汇,其中北部区域的碳汇总量高,为 12582.46
kgC/(hm 2 ·a);南部地区次之,碳汇总量为 9669.81 kgC/(hm 2 ·a),中部地区最低,碳
汇总量为 5063.98 kgC/(hm 2 ·a)。现阶段碳吸收总量,北部地区碳吸收总量最大,其
次是南部地区,中部地区碳吸收总量最小;北部地区的碳总排放量和碳足迹均最高,
是整个宁夏地区最主要的碳排放区;其次是南部地区,中部地区最低。 影响各区域
农田生态系统碳汇量差异的主要原因是强碳汇作物的种植面积,产量以及农田物质的
投入量,其中化肥投入是农田生态系统最主要碳源。
近 30 年宁夏农田生态系统碳吸收量呈现阶段性增长趋势,北部地区碳吸收量
最高,其次是南部地区,中部地区最低。区域农田碳吸收强度变化差异明显,北部
地 区 ( 3.91t/hm 2 -5.57t/hm 2 ) > 中 部 地 区 ( 0.72t/hm 2 -3.41t/hm 2 ) > 南 部 地 区
(0.84t/hm 2 -2.41t/hm 2 )。农田碳排放量均呈逐年增长趋势。北部地区碳汇量最高,
中部地区呈阶段性增长,增长幅度大于南部地区,主要原因是和灌溉条件和作物品
种有关;南部地区碳汇量呈波动增减,与作物种植结构调整有关。
北部地区碳汇经济价值最高,并随年限呈现先增后减的趋势,其最大值为
197.79$/hm 2 ;中部地区碳汇价值呈现波动性增长,最大值为 178.52$/hm 2 ;南部地
区碳汇价值呈现阶梯性增长,最大值为 118.90$/hm 2 。
区域农田生态系统碳汇经济效益均随着碳足迹成本的投入呈先增长后降低的趋势。北部地区农田碳足迹成本价值为 110.97$/hm 2 左右时,碳汇经济效益达到最
大值,为 182.35$/hm 2 。中部地区最佳碳足迹成本为 9$/hm 2 ,最大碳汇经济效益为
113.95$/hm 2 ;南部地区最佳碳足迹成本为 18.96$/hm 2 ,最大碳汇经济效益为
111.53$/hm 2 。
关键词:农田生态系统,宁夏,碳源/汇,碳足迹,碳汇经济效益

Other Abstract

Farmland is an important component of ecosystem,which has significance in
reducing atmospheric CO 2  concentration,mitigating the negative effects of climate
change,and improving regional environmental situation.In this study, the status and
dynamic changes of carbon emissions, carbon absorption intensity, carbon footprint were
compared in three farmland ecosystem in Ningxia (the Yellow River irrigation areas in
northern region, central plateau semi-arid regione, southern loess hilly-gully region).
Simultaneously, their economic benefits were also calcaluted, in order to get the optimal
carbon footprint costs and carbon sequestration value output, the relationship between
carbon footprint and economic benefits were analyzed. The main findings are as follows:
The farmland ecosystem in ningxia are carbon sinks, total carbon sinks in northern
region was highest(12582.46 kgC/(hm 2 •a)), followed by Southern region(9669.81
kgC/(hm 2 •a)), the central region is the lowest(5063.98 kgC/(hm 2 •a)). The present stage of
the amount of carbon sequestration ranked a descending sequences as northern region>
Southern region> Central region. Futhermore, Northern region which was the most
important carbon emissions of the whole ningxia region had the highest carbon footprint
and carbon emissions, The second was the South region, Central region was lowest. The
influence factor of carbon sequestration difference in different region was strong carbon
sequestration crops planting area, yield, and farmland material inputs, among them
fertilizer input was the main carbon source of farmland ecosystem.
Nearly 30 years, the farmland ecosystem carbon uptake in ningxia showed a trend of
gradual growth, carbon uptake is highest in North region, followed by south region,
central region is thelowest. Regional farmland carbon absorption intensity ranked a
descending sequences as Northern region (3.91 t/hm 2 -5.57 t/hm 2 ) > Central region (0.72  t/hm 2 -3.41 t/hm 2 ) > South region(0.84 t/hm 2 -2.41 t/hm 2 ). Farmland carbon emissions
showed a trend of increased year by year. carbon sinks is the highest in northern region,
central region showed periodically growth, and growth rate was greater than the south
region, the main reason was irrigation and crop varieties; Carbon sequestration in
Southern region showed fluctuations, which was related to the crop planting structure.
Economic value of carbon sinks was highest in northern area, which showed
increase at the early stage and then decreased with years, its maximum value is 197.79 $/
hm 2 ; Central carbon sink value presented the volatility growth, its maximum value is
$178.52 / hm 2 ; Southern region showed periodic growth, its maximum value is 118.90 $/
hm 2 .the carbon sink economic benefit of farmland ecosystem inceased at the early stage
and then decreased with carbon footprint cost. when farmland carbon footprint cost value
in Northern region is about $110.97 / hm 2 , carbon sink reach maximum economic
benefits, at $182.35/hm 2 . the best carbon footprint costs in Central region is $9/hm 2 , the
largest carbon sink economic benefit is $113.95 / hm 2 ; the best carbon footprint costs in
South region is $18.96/hm 2 , the largest carbon sink economic benefit is $111.53/hm 2 .
Keywords :farm ecosystem,Ningxia,carbon source/sink,carbonfootprint,carbon
sink economic benefits

Language中文
Document Type学位论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8989
Collection水保所知识产出(1956---)
Recommended Citation
GB/T 7714
李明瑞. 宁夏农田生态系统碳源/ 汇特征[D]. 北京. 中国科学院研究生院,2014.
Files in This Item:
File Name/Size DocType Version Access License
宁夏农田生态系统碳源汇特征.pdf(1024KB)学位论文 开放获取CC BY-NC-SAApplication Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[李明瑞]'s Articles
Baidu academic
Similar articles in Baidu academic
[李明瑞]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[李明瑞]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.