吉林西部水田时空变化与固碳效应研究  

TEMPORAL AND SPATIAL VARIATIONS OF PADDY FIELDS AND ITS CARBON SEQUESTRATION EFFECT IN WESTERN JILIN

作　　者：徐小明[1] 汤洁[1] 李昭阳[1] 韩维峥[1] 廉宏宇[2] 

机构地区：[1]吉林大学环境与资源学院,长春130026 [2]大庆油田工程有限公司,大庆163712

出　　处：《第四纪研究》2011年第2期370-377,共8页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:40871088)资助

摘　　要：通过解译吉林西部1989年、1996年、2000年、2004年和2008年等5个年份的土地利用／覆被变化（LUCC）数据，获取吉林西部水田面积变化及其空间分布情况。设置了38个典型采样单元，各单元分别采集3～5个土样，测试不同土地利用类型的有机碳含量，分析水田开发所引起的LUCC变化对水田有机碳储量的影响。结果显示：1989～2008年间由于LUCC变化使得水田表层（0～30cm）土壤有机碳储量增加了874．16×10^7kg；研究区较大面积的水田表层土有机碳汇位于在白城市与镇赉县交界处及镇赉县东北部，而碳源则主要分布在前郭县北部与松原市境内。研究成果可以为研究全球气候变化提供局地基础数据支持，有助于探索全球及区域尺度的碳循环状况，同时在缓解该区当前严峻的土地问题、为土地开发提供决策依据等方面也具有积极意义。At present,carbon cycle in terrestrial ecosystems became a hot issue in studying global change because of the widespread concerning about the global warming. Land use/cover change （LUCC） was one of the most important factor among all the impact ones. It was a typical responding area to global changing in middle latitude areas in Western Jilin province of China which have a complex environment and intricate LUCC status. In this paper, in order to interpret the TM remote sensing images of Western Jilin in the years of 1989, 1996, 2000, 2004 and 2008, the LUCC data of the five years were achieved, as well as the area of paddy fields and spatial distributions. Moreover,according to the LUCC maps＇in different years, 123 soil samples were collected to obtain average soil organic carbon（SOC） contents of different LUCC types and different stages of paddy development. Then the organic matter contents of these samples were measured by the potassium dichromate oxidation-outer heating method. Based on the LUCC data and soil data above, the amount of SOC sequestrated by the surface soil （0 - 30cm） of paddy fields was calculated. The results indicated that the area of paddy fields was increasing continuously in Western Jilin during 1989 to 2008. The areas of paddy fields in 1989, 1996, 2000, 2004 and 2008 were 11.28×10^4hm2 ,16.87×10^4hm2 ,18.53× 10^4hm2 ,22.67×10^4hm2 and 24.09×10^4hm2 , respectively. The increasing rate of paddy fields showed a fluctuation trend during the 20 years. New developmental paddies in those 20 years were mainly converted from wetlands （ 3.35 × 10^4 hm^2 ） , grass lands （ 3.13 × 10^4 hm^2 ） and water area （ 3.09 × 10^4 hm^2 ） , while part of paddy fields （ 0.58 × 10^4hm^2） changed to saline-alkaline lands. Besides, the average SOC densities of paddy fields in Western Jilin, which had a higher value than the national average of China, were rising with the increasing of development years. From 1989 to 2008,the total amount of organic carbon sequestrated by LUCC

关 键 词：吉林西部 水田 LUCC 土壤有机碳 固碳效应 

分 类 号：S159.2[农业科学—土壤学] S153[农业科学—农业基础科学]