干旱区生态环境知识资源中心(Arid): 极端干旱区多枝柽柳叶片气孔导度的环境响应模拟

Arid

	极端干旱区多枝柽柳叶片气孔导度的环境响应模拟
其他题名	Simulating responses of leaf stomatal conductance to environmental factors for Tamarix ramosissma in an extreme arid region of China
	鱼腾飞 1; 冯起1 ; 司建华2
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2012
卷号	36 期号:6 页码:483-490
中文摘要	气孔通过调节植物体水分散失和CO_2吸收在植物适应环境变化和环境胁迫中发挥重要作用。该文在对极端干旱区多枝柽柳(Tamarix ramosissma)叶片气体交换参数观测的基础上,引入诊断函数f(H)对BWB模型和BBL模型提出的气孔导度(g_s)模型中的空气湿度(h_s或D_s)进行了评价,并将评价结果引入叶子飘和于强推导出的g_s机理模型。结果表明:(1)BWB和BBL模型对h_s(或D_s)的模拟效果存在很大差异:BWB模型拟合效果较好(R~2=0.5354),BBL模型的结果显著但效果较差(R~2=0.1103)。试验结果显示:随h_s(或D_s)的增大,g_s呈先增大后减小的趋势,可用Gauss模型进行拟合,R~2分别为0.593和0.258,说明g_s与h_s的关系要比D_s更密切;(2)叶子飘和于强给出的简化模型(Simple模型)和该文给出的指数模型(Gauss-h模型)均具有较好的模拟效果(R~2分别为0.8707和0.8286),eta值分别为0.1245和0.0171,其值均介于0-1之间;(3)模型验证中Gauss-h模型较Simple模型明显低估了观测值,当观测条件无限趋近于Simple模型的假设时,Simple模型的拟合效果可得到显著提高(R~2=0.9606)。
英文摘要	Aims Stomata play a key role in plant adaptation to changing environmental conditions and environmental stress because they control both water losses and CO_2 uptake. Methods Based on observation of leaf gas exchange parameters of Tamarix ramosissma in an extreme arid region in northwest of China, the relative humidity (h_s) (or vapor pressure deficit (D_s)) of the BWB and BBL model were evaluated by introducing diagnosis function f(H). After that, the results were imported into the Ye and Yu mechanism model for simulation of stomatal conductance (g_s) of T. ramosissma. Important findings A significant difference was found for h_s (or D_s) of the BWB and BBL model with R~2 of 0.535 4 and 0.110 3, respectively, and the g_s is significantly related to h_s and D_s with a Gauss model with R~2 of 0.593 and 0.258, respectively. It suggests that the relationship between g_s and h_s is closer than D_s. Both the simplified model (referred to Simple model) proposed by Ye and Yu and its correction (referred to Gauss-h model) behaved well with R~2 of 0.870 7 and 0.828 6 and eta of 0.124 5 and 0.017 1 (range from 0 to 1), respectively. The model validation shows that the Gauss-h model clearly underestimated the observations more than the Simple model, and the performance of the Simple model was significantly improved (R~2 of 0.960 6) when the observed condition was close to the hypothesis of model infinitely.
中文关键词	BBL模型 ; BWB模型 ; 机理模型 ; 气孔导度 ; 多枝柽柳
英文关键词	BBL model BWB model mechanism model stomatal conductance Tamarix ramosissma
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:4554055
来源机构	中国科学院西北生态环境资源研究院 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228867
作者单位	1.兰州大学西部环境与气候变化研究院, 兰州, 甘肃 730000, 中国; 2.中国科学院寒区旱区环境与工程研究所,阿拉善荒漠生态水文试验站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	鱼腾飞,冯起,司建华. 极端干旱区多枝柽柳叶片气孔导度的环境响应模拟[J]. 中国科学院西北生态环境资源研究院, 兰州大学,2012,36(6):483-490.
APA	鱼腾飞,冯起,&司建华.(2012).极端干旱区多枝柽柳叶片气孔导度的环境响应模拟.植物生态学报,36(6),483-490.
MLA	鱼腾飞,et al."极端干旱区多枝柽柳叶片气孔导度的环境响应模拟".植物生态学报 36.6(2012):483-490.