干旱区生态环境知识资源中心(Arid): 西北干旱区玉米农田光合作用对地表能量平衡的影响

Arid

	西北干旱区玉米农田光合作用对地表能量平衡的影响
其他题名	Effect of the photosynthesis on the surface energy balance in corn farmland in the arid region of Northwest China
	徐菲楠 1; 田志伟 1; 王维真 2
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2018
卷号	54 期号:2 页码:224-232
中文摘要	基于黑河流域生态-水文过程综合遥感观测联合试验的涡动相关通量观测数据与气象资料,拟合了张掖地区玉米农田的土壤呼吸速率,估算玉米的植物光合作用,分析光合作用对地表能量闭合率的影响.结果显示:张掖地区玉米农田土壤呼吸速率与4 cm深度的土壤温度和土壤水分相关性最大,选取该深度处土壤温度和水分拟合土壤呼吸速率.土壤温度和土壤水分的单因子拟合模型均不适用于6月下旬玉米农田土壤呼吸速率拟合,确定了以土壤温度和土壤水分为双因子的非线性双幂模型及其参数.考虑植物光合作用时,地表能量闭合率的提升幅度为2.0%~3.5%,平均约2.7%.植物光合作用与土壤呼吸作用均表现出明显的单峰日变化趋势,前者峰值比后者提前近2 h;与土壤呼吸作用相比,植物光合作用日变化剧烈,变化幅度也较强.准确拟合土壤呼吸速率对植物光合作用估算有很大影响,对于地表能量闭合率研究,植物光合作用的贡献不容忽略.
英文摘要	Meteorological and the flux data obtained from eddy covariance systems over corn fields during the Heihe watershed allied telemetry experimental research program were used to fit the soil respiration rate, in order to estimate the photosynthesis and analyze its effect on the surface energy balance, with the main results that soil respiration rate was more correlated to the soil temperature and moisture at the 4 cm depth, which could be taken as variables to model the soil respiration. The fitting models of single factors about soil temperature or moisture were not suitable for the estimation of soil respiration in Zhangye corn fields. So a non-linear double factors model with soil temperature and moisture was finally applied. Photosynthesis in the surface energy balance equation could improve the energy balance closure ratio by an average level of approximately 2.7%. The diurnal cycle of both photosynthesis and soil respiration was significantly obvious, with the emerging time of photosynthesis peak nearly two hours earlier than that of soil respiration. The magnitude of the diurnal variation range of photosynthesis was larger than that of soil respiration, and the former varied more intensely than the latter. Accurate estimate of soil respiration plays a considerable role in the estimation of photosynthesis. The contribution of photosynthesis to the surface energy cannot be ignored in research on the energy balance closure ratio.
中文关键词	土壤呼吸 ; 光合作用 ; 碳交换 ; 能量闭合率
英文关键词	soil respiration photosynthesis carbon exchange energy balance closure ratio
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:6238362
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237902
作者单位	1.中国科学院西北生态环境资源研究院;;中国科学院大学, 中国科学院黑河遥感试验研究站;;, 兰州;;, ;;北京 730000;;100049; 2.中国科学院西北生态环境资源研究院, 中国科学院黑河遥感试验研究站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	徐菲楠,田志伟,王维真. 西北干旱区玉米农田光合作用对地表能量平衡的影响[J],2018,54(2):224-232.
APA	徐菲楠,田志伟,&王维真.(2018).西北干旱区玉米农田光合作用对地表能量平衡的影响.兰州大学学报. 自然科学版,54(2),224-232.
MLA	徐菲楠,et al."西北干旱区玉米农田光合作用对地表能量平衡的影响".兰州大学学报. 自然科学版 54.2(2018):224-232.