文档介绍：
黄土高原半干旱丘陵区农田土壤呼吸通量
分析#
陈计玲,王乐,李欣,张峰,李凤民**
(兰州大学生命科学学院草地农业生态系统国家重点实验室,兰州 730000)
摘要:农田土壤呼吸是陆地生态系统碳循环的重要组成部分,农业管理措施会对土壤呼吸产
生直接的影响。黄土高原作为中国农田的重要组成部分,本区域内广泛采用覆膜作为农业增
产措施。为了探索覆膜对土壤碳循环的影响,本研究以黄土高原半干旱丘陵区玉米农田为研
究对象,分析了不同覆膜管理方式及不同无机氮肥施加条件下,土壤呼吸通量的日变化、玉
米生育期内的通量变化以及通量与环境因子的关系。研究结果表明:CO2 通量日变化规律比
较明显,均为双峰排放模式。在整个玉米生长季中,CO2 平均通量为 1043~1138mg*m-2*h-1,
覆膜处理在苗期显著增强土壤呼吸,而施氮肥对于 CO2 通量无显著性影响。CO2 通量受温度、
水分及可溶性有机碳等因子的共同影响,相关性分析表明,以上因子与 CO2 排放通量呈正
相关。
关键词:CO2 通量;日变化;CO2 浓度;覆膜;施肥
中图分类号:S-3
Soil Respiration Analysis of Maize Field in Semiarid Area of
Loess Plateau
Chen Jiling, Wang Le, Li Xin, Zhang Feng, Li Fengmin
(State Key Lab of Grassland Agro-Ecosystem,College of Life Science,Lanzhou University,
LanZhou 730000)
Abstract: Soil respiration is a significant part of the terrestrial ecosystem carbon cycle.
Agricultural management measures have a direct impact on soil respiration. As an important
component of farmland in China, plastic film mulching was widely used to increase the crop
production. This study choose maize field as the research object in semi-arid hilly area of The
Loess Plateau to explore the influence of plastic mulching to soil carbon cycle. This paper
analyzed diurnal variation of soil respiration, CO2 flux in corn growth stage and how the flux
effected by the environment factors under different plastic mulching and fertilization conditon.
The result shows that CO2 flux diurnal variation was a double-peak emission model. The mean
value of CO2 flux is 1043~1138mg*m-2*h-1 during the whole growth stage. Plastic mulching
significantly promoted the soil respiration at seedling stage; while nitrogen fertilization had no
siginficant effect on soil repiration. CO2 flux is collectively affected by temperature,moisture and
anic carbon. Correlation analysis shows that CO2 flux was positively related to all
the above factors.
Keywords: CO2 flux; diurnal variation; CO2 concentration; plastic mulching; nitrogen fertilization
0 引言
近年来,由于大气中的温室气体浓度