黄土丘陵侵蚀坡地土壤呼吸初步研究

CORC > 中国农业科学院 > 农业环境与可持续发展研究所 > 生态安全研究室

	黄土丘陵侵蚀坡地土壤呼吸初步研究
	李嵘; 李勇; 李俊杰; 孙丽芳; 张晴雯
刊名	中国农业气象
	2008
卷号	29 期号:2 页码:123-126
关键词	土壤呼吸 ~(137)Cs示踪 5cm土壤温度土壤水分侵蚀坡地
ISSN号	1000-6362
其他题名	A Preliminary Study on Soil Respiration of Eroded Sloping Land in Chinese Loess Plateau
英文摘要	利用Li-8100红外气体分析仪和~(137)Cs示踪技术测定了黄土高原侵蚀撂荒坡地不同侵蚀坡位的土壤呼吸速率。结果表明：土壤呼吸速率在没有侵蚀的坡顶部与坡下部土壤堆积区之间存在极显著差异，坡顶部与坡中部轻度侵蚀区土壤呼吸速率无显著差异。对两个影响土壤呼吸的因素——5cm土壤温度和土壤含水量的分析表明：不同侵蚀坡位土壤呼吸速率日变化曲线形式相同，为“单峰”曲线；5cm土壤温度是影响土壤呼吸速率日变化的主要因素，但其作用随土壤含水量减小而减小；影响土壤呼吸速率日间变化的主要因素为土壤含水量，二者呈显著线性正相关（P=0．043，0．050，0．042），坡顶、坡中、坡下的相关系数依次为0．891、0．878、0．892；日均5era土壤温度与土壤呼吸速率无相关关系。研究结果对于深入探讨黄土高原侵蚀土壤有机碳循环具有一定作用。; We measured the soil respiration of an eroded hillslope in the Chinese Loess Plateau by using Automated Soil CO2 Flux System. The soil erosion/deposition on the slope was determined by the measurements of ~(137)Cs inventory. The results indicated that soil respiration rates were significantly lower at non eroded sites on the summit than that at deposition sites on the slope bottom, but no significant differences were observed for the middle slope sites as compared with the leveled summit. The curves of daily rate of the soil respiration among different positions were simi- lar. The soil temperature at the soil depth of 5 cm was a key factor controlling the soil respiration rate, and the temperature effect decreased with the decline of soil water contents. There existed a significant positive correlation between the soil respiration and the soil water contents, the correlation coefficients were 0. 891,0. 878 and 0. 892 （ p = 0. 043,0. 050,0. 042） for the summit, middle and lower slope respectively. There was no linear or exponential correlation between the soil temperature and the soil respiration rate.
学科主题	园艺 ; 林业
语种	中文
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/17383]
专题	农业环境与可持续发展研究所_生态安全研究室
作者单位	中国农业科学院农业环境与可持续发展研究所, 北京, 100081
推荐引用方式 GB/T 7714	李嵘,李勇,李俊杰,等. 黄土丘陵侵蚀坡地土壤呼吸初步研究[J]. 中国农业气象,2008,29(2):123-126.
APA	李嵘,李勇,李俊杰,孙丽芳,&张晴雯.(2008).黄土丘陵侵蚀坡地土壤呼吸初步研究.中国农业气象,29(2),123-126.
MLA	李嵘,et al."黄土丘陵侵蚀坡地土壤呼吸初步研究".中国农业气象 29.2(2008):123-126.