梭梭（Haloxylon ammodendron）叶片气孔导度与气体交换对典型降水事件的响应

杨淇越; 赵文智

doi:10.7522/j.issn.1000-694X.2013.00333

中国沙漠 >

2014 , Vol. 34 >Issue 2: 419 - 425

DOI: https://doi.org/10.7522/j.issn.1000-694X.2013.00333

生物与土壤

梭梭（Haloxylon ammodendron）叶片气孔导度与气体交换对典型降水事件的响应

杨淇越 ,
赵文智

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1. 中国科学院寒区旱区环境与工程研究所中国生态系统研究网络临泽内陆河流域研究站/中国科学院内陆河流域生态水文重点实验室, 甘肃兰州 730000;
2. 中国科学院大学, 北京 100049

杨淇越（1983—），男，甘肃会宁人，博士研究生，主要从事生态水文研究。Email：yangqy@lzb.ac.cn

收稿日期: 2013-11-13

修回日期: 2014-02-24

网络出版日期: 2014-03-20

基金资助

国家杰出青年科学基金项目（41125002）资助

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Responses of Leaf Stomatal Conductance and Gas Exchange of Haloxylon ammodendron to Typical Precipitation Event in the Hexi Corridor

Yang Qiyue ,
Zhao Wenzhi

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1. Linze Inland River Basin Research Station/Key Laboratory of Inland River Ecohydrology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2013-11-13

Revised date: 2014-02-24

Online published: 2014-03-20

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摘要

C₄植物以其较高的水分利用效率而表现出较强利用荒漠环境有限降水的能力，但对其气孔行为和气体交换对降水响应的理解并不深入。本研究选择荒漠区沙丘上6~7年生的梭梭（Haloxylon ammodendron），利用自制的降水拦截设施，将每次降水事件后样地中接受的降水量分别减少和增加10%、20%和30%，形成包括对照在内的7个降水梯度，研究梭梭气孔导度（G_s）与净光合速率（P_n）对典型降水事件的响应。结果表明：6~12 mm的降水对土壤水分的补给集中在50 cm土壤深度范围内。降水量每增加10%，G_s和P_n分别增加9.17%和4.17%；G_s和P_n在降水前后呈现先增加后降低的单峰型趋势，峰值出现在降水后第1 天，两者与土壤水分含量（SVWC）、空气相对湿度（RH）以及水汽压差（VPD）显著相关。降水后梭梭黎明前叶水势在-2.08~-2.74 MPa时叶片气体交换主要受气孔因素影响，而当叶水势降至-3.16 MPa以下时主要受非气孔因素控制。

关键词： 河西走廊; 梭梭（Haloxylon ammodendron）; C₄植物; 气孔导度; 气体交换

本文引用格式

杨淇越 , 赵文智 . 梭梭（Haloxylon ammodendron）叶片气孔导度与气体交换对典型降水事件的响应[J]. 中国沙漠, 2014 , 34(2) : 419 -425 . DOI: 10.7522/j.issn.1000-694X.2013.00333

Abstract

C₄ plants have strong ability to use limited precipitation in desert environment due to higher water use efficiency, but it is not understanding of stomatal behavior and gas exchange response to precipitation thoroughly. Here the responses of leaf stomatal conductance (G_s) and gas exchange (P_n) of 6-7 year-old Haloxylon ammodendron in desert-sand to seven rainfall treatments (±30%, ±20%, ±10%, CK) which were applied by rainfall manipulative experiments were evaluated. The results showed that the supply of 6-12 mm rainfalls to soil moisture concentrated within 50 cm soil depths. G_s and P_n increased by 9.17% and 4.17% with the increase of precipitation by 10%, respectively. G_s and P_n showed a trend of unimodality which increased to a peak value at 1d after precipitation and then decreases. Both were correlated significantly to Soil moisture content (SVWC), Air relative humidity (RH) and Vapor pressure deficit (VPD). Leaf gas exchange was mainly affected by stomatal factors when predawn leaf water potential of H. ammodendron between -2.08 MPa and -2.74 MPa after precipitation, while by non- stomatal factors when predawn leaf water potential dropped to below -3.16 MPa.

Key words： Hexi Corridor; Haloxylon ammodendron; C₄ plants; stomatal conductance; net photosynthetic rate

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