| 陕北水蚀风蚀交错带沙柳和柠条叶光合作用 对降雨改变的响应 | |
| 陈丽茹1; 李秧秧2 | |
| 2019 | |
| 发表期刊 | 生态学杂志
 |
| 卷号 | 38期号:10页码:2941-2949 |
| 摘要 | 为揭示黄土高原水蚀风蚀交错带分布广泛的两种灌木沙柳和柠条叶光合作用对
降雨改变的响应机制，采用模拟降雨操纵试验( 对照、降雨增加 45%和减少 50%) ，研究了
降雨改变第 3 年两种灌木叶水分关系、光合能力、叶形态结构和养分含量的变化。结果表
明: 沙柳旱季和雨季不同处理间黎明前叶水势无显著差异，旱季正午叶水势对增水和干旱
均有显著响应; 柠条黎明前和正午叶水势对干旱有显著响应，而对增水无显著响应; 沙柳旱
季最大光合速率( Amax ) 、柠条旱季和雨季的 Amax对增水和干旱均有显著响应; 增水导致沙柳
旱季 Amax增加的原因主要是叶生物化学性质改善，而干旱降低沙柳旱季 Amax的主要原因是
CO2扩散的限制; 增水导致柠条旱季光合增加的主要原因是气孔限制的减少，而雨季则与气
孔限制及生化限制的减少均有关; 干旱导致柠条旱季和雨季光合降低的主要原因是细胞生
化限制的增加; 两种灌木比叶质量、叶氮及磷含量对增水和干旱均无显著响应，表明降水改
变导致的光合能力变化与叶形态结构和叶养分含量改变关系不大。研究结果可为全球气
候变化背景下两种灌木的适应性评价和水碳循环模拟提供参考。 |
| 其他摘要 | To understand the responses of photosynthesis in Salix psammophila and Caragana
korshinskii，two shrub species commonly distributed in the water and wind erosion crisscross
region on the Loess Plateau，to precipitation alteration，a manipulated precipitation experiment
( control，water addition by 45%，and water reduction by 50%) was conducted． Leaf water rela-
tion，photosynthetic capacity，leaf morphological structure and nutrient concentration were meas-
ured after three years precipitation manipulation． For Salix，there was no difference of predawn
leaf water potential among treatments during both dry and wet season，while midday leaf water
potential showed significant responses to both water addition and reduction during the dry season．
For Caragana，both predawn and midday leaf water potential significantly decreased by water
reduction，and showed no response to water addition． The light-saturated photosynthetic rate
( Amax ) in Salix during the dry season and Caragana during both dry and wet changed for the
treatments of water addition and reduction． The enhanced Amax in Salix by water addition during
dry season was attributed to improved biochemical properties，while the decreased Amax in Salix
during dry season was mainly related to increased CO2 diffusion limitation． For Caragana，the
increased Amax by water increase during the dry season was attributed to decreased stomatal limita-
tion，and to decreased CO2 diffusion limitation and biochemical limitation during the wet season，
respectively． The decreased Amax of Caragana by water reduction during
to increased biochemical limitation． Specific leaf mass，N and P contents of both species did not
respond to water addition and reduction，indicating that the variation of Amax by water availability
was not related to leaf structure and nutrient limitation． These results provide reference for evalua-
ting the adaptability of both shrub species and modeling water and carbon cycling under future
climate change．
|
| 关键词 | 沙柳 柠条 光合能力 增水 遮雨 |
| 收录类别 | 中文核心期刊要目总览 |
| 语种 | 中文 |
| 文献类型 | 期刊论文 |
| 条目标识符 | sbir.nwafu.edu.cn/handle/361005/9277 |
| 专题 | 水保所知识产出(1956---) |
| 作者单位 | 1.西北农林科技大学林学院 2.西北农林科技大学水土保持研究所 |
| 推荐引用方式 GB/T 7714 | 陈丽茹,李秧秧. 陕北水蚀风蚀交错带沙柳和柠条叶光合作用 对降雨改变的响应[J]. 生态学杂志,2019,38(10):2941-2949. |
| APA | 陈丽茹,&李秧秧.(2019).陕北水蚀风蚀交错带沙柳和柠条叶光合作用 对降雨改变的响应.生态学杂志,38(10),2941-2949. |
| MLA | 陈丽茹,et al."陕北水蚀风蚀交错带沙柳和柠条叶光合作用 对降雨改变的响应".生态学杂志 38.10(2019):2941-2949. |
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