ISWC OpenIR  > 水保所知识产出(1956---)
立地条件和树龄对刺槐和小叶杨叶水力 学特性的影响
Thesis Advisor李秧秧
Degree Grantor中国科学院研究生院
Place of Conferral北京
Keyword刺槐 小叶杨 立地条件 树龄 叶水力学特性 叶生理生态性状

皮导度和PV 曲线参数(膨压损失点时的相对含水量RWCtlp、膨压损失点时的水势ψtlp、
降,PV 曲线参数出现不同程度的下降。两种树木叶最大水力导度和ψtlp 呈显著正相关,
和PV 曲线参数之间存在一定的相关性,表明叶水力脆弱性是两种树木不同树龄阶段
力导度、净光合速率和气孔导度,而水分利用效率和N、P 养分含量均增加。随树龄
配到光合器官中的N 含量比例的减少是随树龄增加净光合速率降低的重要原因。立地

Other Abstract

Site and tree age are major factors of forming small dwarf tree on the Loess Plateau.
Thus, taking two typical tree species of small dwarf trees on the Loess Plateau, Robinia
pseudoacacia and Populus simonii as objects, , this paper studied the impact of sites (gully
tableland with good water supply and slopeland with low water supply) and tree age on leaf
hydraulic traits, leaf morpho-physiological traits and drought resistance aimed to elucidate
the related hydraulic mechanism of small dwarf tree-forming. The main results obtained
from this study were as follows:
(1) For both trees growing on tableland had larger leaf maximum hydraulic
conductance than those trees on slopeland, leaf maximum hydraulic conductance decreased
with the increase of tree age. Tableland-growing trees had higher leaf epidermal
conductance and PV curve parameters (including relative water content at turgor pressure
loss point RWCtlp, water potential at turgor pressure loss point ψtlp, and osmotic potential at
saturated water content ψsat) than those on slopeland; leaf epidermal conductance decreased
with the increase of tree age, and the PV curve parameters decreased to a different extent
for the two species. Leaf maximum hydraulic conductance was positively related with ψtlp,
suggesting there existed a tradeoff relationship between leaf flux capacity and
(2) The results indicated that for both species, trees growing on tableland had higher
hydraulic vulnerability (P50) and safety margin of water transport than those trees on
slopeland, but the vulnerability was almost the same with the increase of tree age. Safety
margin of water transport decreased with the increase of tree age. P50 was positively related
with some PV curve parameters, indicating for both trees at different age P50 was an
important drought-resistant trait.
(3) Black locust growing on the slopeland had smaller leaf area, higher specific leaf
mass and leaf thickness, lower whole-tree hydraulic conductance, decreased net
photosynthetic rate and stomatal conductance ,increased water use efficiency and N、P  nutrient content. Changes of leaf morpho-physiological traits of two species with tree age
showed the same trend as in drought habitat. Worse leaf water status and decreased
proportion of N in photosynthetic apparatus contributed to the decrease of photosynthetic
rate in old-aged trees. Site and tree age showed significant interaction for some important
leaf traits, indicating decreased photosynthetic area, raised leaf construction cost and lower
net photosynthetic rate are major reasons of forming small dwarf tree on the Loess Plateau.
Key Words:Robinia pseudoacacia; Populus simonii; site; tree age; leaf hydraulic traits;
leaf morph-physiological traits

Document Type学位论文
Recommended Citation
GB/T 7714
李俊辉. 立地条件和树龄对刺槐和小叶杨叶水力 学特性的影响[D]. 北京. 中国科学院研究生院,2012.
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