干旱区生态环境知识资源中心(Arid): 亚热带和黄土高原区耕作土壤有机碳对全球气候变化的响应

Arid

	亚热带和黄土高原区耕作土壤有机碳对全球气候变化的响应
其他题名	Responses of Soil Organic Carbon to Global Climate Changes in Cultivated Soils in the Subtropical and the Loess Plateau Regions
	吴金水 1; 童成立 2; 刘守龙 2
来源期刊	地球科学进展
ISSN	1001-8166
出版年	2004
卷号	19 期号:1 页码:131-137
中文摘要	采用计算机模拟方法研究了我国亚热带和黄土高原地区耕作土壤有机碳状况及其对全球气候变化的响应.结果表明,在新鲜有机质输入相同的情况下,亚热带地区的耕作土壤(0～20 cm)有机碳积累量比北温带地区大约低50%,黄土高原地区的耕作土壤有机碳积累量略高于北温带.预测到2050年气温升高1.5～3℃,而其它条件不变的情况下,亚热带地区和黄土高原地区的耕作土壤有机碳积累水平将分别下降5.6%～10.9%和3.6%～9.4%.在保证化肥使用量不变的同时增加有机肥投入,亚热带地区的稻作土壤和黄土高原地区的旱作土壤的有机碳含量都表现出逐步增加的趋势,且大于同期因气温升高所造成的不利影响.
英文摘要	Global climatic changes have been world widely concerned, particularly the continuous rise of atmospheric temperature, mainly due to the increase in C0_2 concentration in the atmosphere. The release of soil organic C during the past century (e. g. due to deforest) has been considered as one of the main source of atmospheric C02. It is predicted that, assuming that die global temperature rise by 0.03℃ annually by 2050, about 7% of soil organic C ( equivalent to 61 * 10~(15)15g C accumulated in world soil) would release as CO_2 into atmosphere. However , information on the responses of soil organic C to climatic changes in different regions shows a lack in many parts of die world, although such information are important knowledge in maintaining soil organic C and fertility in the regions.This paper reports a study of the present trend of organic C in cultivated soils in the subtropical ( with warm and moist conditions) and semi - arid (the Loess Plateau) regions in China and the response to global climatic changes, based on predictions using a model ( SCNC) recently developed for simulating the turnover of organic matter and nitrogen in cultivated soils in China. The model was tested by data from long - term field experiments in these regions and Rothamsted, UK. Soil management to remedy the detrimental effects of climatic changes on the accumulation of organic C was also discussed. The model predicted that, when the amounts of fresh organic material input and soil clay content are the same, the slock of soil organic C at the equilibrium was 50% smaller in the subtropical region than that in moist temperate zones (using Rothamsted in UK as the representative) , whist the amount in the semi - arid region was slightly larger. Because multi - cropping systems in the subtropical region have resulted in the high input rates of fresh organic materials (e. g. crop residues) , the amounts of organic C accumulated can consequently maintain generally larger than that in the Loess Plateau region where the input rates of fresh organic materials are generally low, due to the low productivity of crops. Assuming atmospheric temperature rises at the gradients of 1.5 and 3℃ by 2050 (equivalent to annually mean rises of 0. 03℃ and 0. 06℃ , respectively), and fresh organic material input maintains steady, the amounts of soil organic C would decrease by 5. 6% ~ 10. 9% in the subtropical region and 3. 6% -9.4% in the semi - arid region. The percentages of decreases were dependent on the present amounts of soil organ-ic C, and were slightly smaller than that predicted for moist temperate zones (e. g. 5.1% ~ 10.3% for Rothamsted soils). When 40% ~ 60% of crop straw produced incorporates into the soils, the amount of organic C in these regions can increase by over 40% by 2050. Thus, it is proposed that increasing the incoiporation of crop residues and manure is essential for maintaining the pool of soil organic C in the regions.
中文关键词	土壤有机碳 ; 全球气候变化 ; 模拟与预测
英文关键词	soil organic C global climatic change model simulation and prediction
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:1500193
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204908
作者单位	1.中国科学院亚热带农业生态研究, 长沙, 湖南 410125, 中国; 2.中国科学院亚热带农业生态研究所, 长沙　, 湖南 410125, 中国
推荐引用方式 GB/T 7714	吴金水,童成立,刘守龙. 亚热带和黄土高原区耕作土壤有机碳对全球气候变化的响应[J],2004,19(1):131-137.
APA	吴金水,童成立,&刘守龙.(2004).亚热带和黄土高原区耕作土壤有机碳对全球气候变化的响应.地球科学进展,19(1),131-137.
MLA	吴金水,et al."亚热带和黄土高原区耕作土壤有机碳对全球气候变化的响应".地球科学进展 19.1(2004):131-137.