Daily variation of carbon flux in soils of Populus euphratica forests in the middle and lower reaches of the Tarim River  

作　　者：Huang Xiang Chen Yaning Li Weihong Ma Jianxin Chen Yapeng 

机构地区：[1]Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China [2]Graduate University, Chi- nese Academy of Sciences, Beijing 100039, China

出　　处：《Progress in Natural Science:Materials International》2007年第5期584-590,共7页自然科学进展·国际材料（英文版）

基　　金：Supported by Knowledge Innovation Important Direction Item of Chinese Academy of Sciences (Grant No. kzcx2-yw-127);National Natural Science Foundation of China (Grant Nos. 90502004, 40671014)

摘　　要：In order to lucubrate the daily variation of respiration in soils of Populus euphratica forests and analyze its relationship with environmental factors in the middle and lower reaches of the Tarim River, the LI-8100 instrument of soil CO2 flux system was used to measure the parameters of soil carbon flux and air temperature 10 cm above ground surface along the profiles of Usyman, Archy River, Yengisu and Karday, and the relationships between the soil carbon flux and the soil moisture content were analyzed. The nonlinear regression analysis was carried out with the software SPSS13.0. We observed that： （1） soil respiration began to be restrained when the air temperature was up to 30℃ 10 cm above the ground surface; （2） the rates of soil respiration under the forests of Populus euphratica were significantly different at various moisture contents, the soil carbon flux was high along the Usyman profile, which has a high soil moisture content, and it was low along the profiles of Archy River, Yengisu and Karday, which has a low soil moisture content; （3） the exponential model can be used to explain the relationship between soil respiration and air temperature 10 cm above the ground surface. The average Q10 values along the profiles of Usyman, Archy River, Yengisu and Karday are 0.61, 0.16, 0.22 and 0.35 respectively, much lower than the average of the world; （4） there is a positive correlation between the soil carbon flux and the soil moisture content.以便刻苦攻读在 Populus euphratica 森林和分析的土壤的呼吸的每日的变化它与在 Tarim 河的中间、更低的活动范围的环境因素的关系，土壤公司<SUB>2</SUB>流动系统的 LI-8100 仪器被用来沿着在土壤碳流动之间的 Usyman ， Archy 河， Yengisu 和 Karday 和关系的侧面在地面表面上面测量土壤碳流动和空气温度 10 厘米的参数，土壤潮湿内容被分析。非线性的回归分析与软件 SPSS13 被执行。0。我们观察了那：(1 ) 当空气温度直到 10 厘米上面的 30 ° C 时，土壤呼吸开始被制止扎根的表面；( 2 )在在各种各样的潮湿内容显著地不同的 Populus euphraticawere 的森林下面的土壤呼吸的率，土壤碳流动沿着 Usyman 侧面高，它有高土壤潮湿内容，和它沿着 Archy 的侧面是低的河，有一个低土壤潮湿内容的 Yengisu 和 Karday ：(3 ) 指数的模型能被用来在扎根的表面上面解释在土壤呼吸和空气温度 10 厘米之间的关系。沿着 Usyman， Archy 河， Yengisu 和 Karday 的侧面的平均 Q <SUB>10</SUB> 价值是 0.61， 0.16， 0.22 和 0。35 分别地，比世界的一般水准低得多；(4 ) 在土壤碳流动和土壤潮湿内容之间有积极关联。

关 键 词：Populus euphratica soil carbon flux air temperature 10 cm above ground surface soil moisture content the Tarim River 

分 类 号：S714.5[农业科学—林学] S718.554.1