Insight into the reasons of leaf wax δD_(n-alkane) values between grasses and woods  

草本与木本植物叶蜡正构烷烃氢同位素差异探析（英文）

作　　者：刘金召 刘卫国 安芷生 

机构地区：[1]School of Human Settlements and Civil Engineering,Xi’an Jiaotong University [2]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment, Chinese Academy of Sciences

出　　处：《Science Bulletin》2015年第5期549-555,共7页科学通报（英文版）

摘　　要：Many studies have observed that leaf wax δDn-alkane values differed significantly between woods and grasses in modern plants, with grasses D-depleted by 40 %0-70 ‰. The reasons for the differences in leaf wax δDn-alkane values between woods and grasses, however, remain unclear. In this study, we measured the δD values of soil water （δDsw）, leaf water （δDlw）, and leaf wax n-alkane （δDn-alkane） for woods and grasses. We found no significant differences in the δD values of soil water （P = 0.82） and leaf water （P= 0.74） between the two life forms of plants. Therefore, the differences in leaf wax δDn-alkane values between woods and grasses may correlate with inherent properties of different plant life forms, such as leaf structures, biosynthetic processes, and leaf morphologies. Moreover, it is also possible that soil water with different 6Dsw at different depths utilized by woods and grasses may be responsible for some of the differences in leaf wax δDn-alkane values between the two life forms of plants, if woods mainly use soil water from the 〉100 cm depth, whereas grasses mainly use soil water from the 〈100 cm depth. The results of this work allow us to better understand the leaf wax δDn-alkane values of different plant life forms in a region.许多研究观察了那叶蜡 D < 潜水艇 class= “ a-plus-plus ” >n 链烷 </sub> 价值在现代植物在森林和草之间显著地不同，与在 40 弄空 D 的草 ? 70 ? 。为在叶的差别的原因给 D 打蜡 < 潜水艇 class= “ a-plus-plus ” > 然而，在森林和草之间的 n 链烷 </sub> 价值仍然保持不清楚。在这研究，我们测量了土壤水的 D 价值(D < 潜水艇 class= “ a-plus-plus ” > sw </sub>), 叶水(D < 潜水艇 class= “ a-plus-plus ” > lw </sub>), 和叶蜡 n 链烷(D < 潜水艇 class= “ a-plus-plus ” > 为森林和草的 n 链烷 </sub>) 。我们没在土壤水的 D 价值发现重要差别(P ?=? 0.82 ) 并且叶水(P ?=? 0.74 ) 在植物的二种生活形式之间。因此，在叶的差别给 D 打蜡 < 潜水艇 class= “ a-plus-plus ” > 在森林和草之间的 n 链烷 </sub> 价值可以与不同植物生活形式的固有的性质相关例如叶结构， biosynthetic 过程，和叶形态学。而且，与不同 D 玷污水，也是可能的<潜水艇class=“ a-plus-plus ”>在由森林和草利用的不同深度的 sw </sub>可能为一些在叶蜡 D 的差别负责<潜水艇class=“ a-plus-plus ”>在植物的二种生活形式之间的n链烷</sub>价值森林主要从? 使用土壤水> 100 ?厘米深度，而草主要使用土壤，从? 流水< 100 ?厘米深度。这个工作的结果允许我们更好理解叶蜡 D < 潜水艇 class= “ a-plus-plus ” > 在一个区域的不同植物生活形式的 n 链烷 </sub> 价值。

关 键 词：Hydrogen isotope Pant Leaf wax N-ALKANE Leaf water Soil water 

分 类 号：Q945[生物学—植物学]