开垦对高寒草甸土壤有机碳影响的初步研究
Preliminary Research of Effect of Cultivation on Soil Organic Carbon in Alpine Meadow
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文摘
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在中国科学院海北高寒草甸生态系统定位站地区.选择高寒草甸开垦后形成的一年生人工草地作为研究对象,开垦年限分别为0、1、11、16和20年,利用土壤有机碳密度分组法.进行了0~40cm土层土壤有机碳及不同组分(轻组有机碳.重组有机碳)含量及随开垦年限变化关系的研究。结果表明:高寒草甸开垦后其土壤有机碳的变化主要发生在0~10cm土层.土壤中SOC、LFOC和HFOC呈下降趋势,至20年时分别下降了10.5%、26.7%、8.1%。主要原因为当地较为强烈的风蚀作用、耕作侵蚀和开垦加剧了表层(0~10cm)土壤有机质的氧化分解.表层土壤中的粗有机物质在降水淋溶作用下,在土体下部重新淀积。而0-40cm土体内。SOC、LFOC和HFOC略有增加,开垦20年,他们的累积速率分别为0.08tC·hm^-2·yr^-1、0.07tC·hm^-2·yr^-1、0.14t C.hm^-2.yr^-1。人工草地长期种植虽然没有改变高寒草甸作为碳汇的基本功能.但却大大降低了其碳汇效应.植物-土壤系统年固定碳量由未开垦前的7.38tC·hm^-2·yr^-1下降至6.89tC·hm^-2.yr^-1。 |
其他语种文摘
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This paper studies the effects of alpine meadow cultivated on soil organic carbon (SOC) using soil physical fraction to understand the stability of SOC at Haibei research station zone, CAS. The SOC contents and its fraction in soil physical fraction (light fraction organic carbon (LFOC) and Heavy fraction organic carbon (HFOC)) in 0-40cm soil depth were investigated. The law of soil organic carbon changed with the cultivation year is studied synchronously. The artificial grassland was selected by different cultivation year (0, 1, 11, 16, 20 yr) after alpine meadow had been cultivated. The results showed that SOC, LFOC and HFOC only decreased in 0-10cm, and respectively, lost 10.97 %, 7.75 % and 7.4 % with 20 years of cultivation,which was mainly caused by wind erosion, tillage erosion and soil organic matter decomposition in 0-10cm after cultivation. The gross organic matter in 0-10cm leached with the rainwater to deposit in deeper horizon of soils. SOC, LFOC and HFOC increased in 0-40 cm soil depth, respectively, with the rate of 0.08 tC·hm^-2yr^-1, 0.07 tC·hm^-2yr^-1 and 0.14 tC·hm^-2yr^-1 after conversion of alpine meadow to artificial grassland for 20 years. Furthermore, the results indicated that conversion of alpine meadow to artificial grassland did not affect the carbon sink function of alpine meadow, but the storage of carbon-fixed in the soil-plant systems decreased obviously compared to the alpine meadows: the rate ranged from 7.38 tC·hm^-2yr^-1 to 6.89 tC·hm^-2yr^-1 |
来源
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地理科学进展
,2005,24(6):59-65 【核心库】
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关键词
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开垦
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高寒草甸
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土壤有机碳
;
轻组有机碳
;
重组有机碳
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地址
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1.
中国科学院西北高原生物研究所, 青海, 西宁, 810001
2.
中国科学院大气物理研究所, 北京, 100029
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1007-6301 |
学科
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大气科学(气象学);农业基础科学 |
基金
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国家自然科学基金项目
;
中国科学院知识创新工程重大项目
;
中国科学院知识创新工程重大项目
;
中国科学院资源环境领域野外台站研究基金
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文献收藏号
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CSCD:2163459
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参考文献 共
24
共2页
|
1.
Post W M. A W King & D L DeAngelis.
Am.Sci,1990:78
|
被引
1
次
|
|
|
|
2.
Berner R A. Atmospheric carbon dioxide levels over Phanerozoic time.
Science,1990,249:1382
|
被引
25
次
|
|
|
|
3.
Adams J M. Increases in terrestrial carbon storage from the last glacial maximum to the present.
Nature,1990,348:711-714
|
被引
72
次
|
|
|
|
4.
Atjay G L. Ketner P & Duvigeaud P.
The global carbon cycle scope,1979:129-182
|
被引
1
次
|
|
|
|
5.
Iwaki H. Matter Production of Terrestrial Plant Communities Ⅱ.
Matter Production of Terrestrial Plant Communities Ⅱ,1973:32-45
|
被引
1
次
|
|
|
|
6.
周广胜. 陆地生态系统类型转变与碳循环.
植物生态学报,2002,26(2):250-254
|
被引
72
次
|
|
|
|
7.
Tiessen H J. Cultivation effects on the amount and concentration of carbon.
Agronomy Journal,1982,74:831
|
被引
8
次
|
|
|
|
8.
Aguilar R. Effects of cultivation on soils in northern Great Plains rangeland.
Soil Science Society of America Journal,1988,52:1081-1085
|
被引
24
次
|
|
|
|
9.
Davidson E A. Davidson E A & Ackerman I L.
Biogeochemistry,1993,20:161-193
|
被引
131
次
|
|
|
|
10.
王根绪. 青藏高原草地土壤有机碳库及其全球意义.
冰川冻土,2002,24(6):693-700
|
被引
122
次
|
|
|
|
11.
张金霞. 放牧强度对高寒灌丛草甸土壤CO_2释放速率的影响.
草地学报,2001,9(3):183-190
|
被引
23
次
|
|
|
|
12.
曹广民. 高寒草甸不同土地利用格局土壤CO_2的释放量.
环境科学,2001,22(6):14-19
|
被引
44
次
|
|
|
|
13.
陈伏生. 开垦对草甸土有机碳的影响.
土壤通报,2004,35(4):413-419
|
被引
17
次
|
|
|
|
14.
严平. ~(137)Cs法测定青藏高原土壤风蚀的初步结果.
科学通报,2000,45(2):199-204
|
被引
50
次
|
|
|
|
15.
Christensen B T. Physical fractionation of soil and organic matter in primary particle size and density separates.
Adv.Soil Sci,1992,20:2-90
|
被引
100
次
|
|
|
|
16.
Christensen B T. Physical fractionation of soil and structural and functional complexity in organic matter turnover.
European J.Soil Sci,2001,52:345-353
|
被引
154
次
|
|
|
|
17.
Janzen H H. Soil organic matter characteristics after long term cropping to various spring wheat rotations.
Can.J.Soil Sci,1987,67:845-856
|
被引
28
次
|
|
|
|
18.
张金波. 土地利用方式对土壤碳库影响的敏感性评价指标.
生态环境,2003,12(4):500-504
|
被引
84
次
|
|
|
|
19.
魏朝富. 紫色水稻土有机无机复合与土粒团聚的关系.
土壤学报,1996,33(1):70-77
|
被引
20
次
|
|
|
|
20.
Schlesinger W H. An overview of global carbon cycle.
Soils and Global Change,1995:9-25
|
被引
26
次
|
|
|
|
|