Specific Leaf Area and Leaf Dry Matter Content of Plants Growing in Sand Dunes

沙丘生境主要植物比葉面積和葉乾物質含量的比較研究

李玉霖(Yu-Lin Li) ； Douglas A. Johnson ； 蘇永中(Yong-Zhong Su) ； 崔建垣(Jian-Yuan Cui) ； 張銅會(Tong-Hui Zhang)

《Botanical Bulletin of Academia Sinica》 46卷2期 (2005/04) Pp. 127-134

https://doi.org/10.7016/BBAS.200504.0127

摘要

本文研究了生長在不同沙丘生境中（流動沙丘，半固定沙丘和固定沙丘）20個植物種（10個一年生植物種和10個多年生植物種）的比葉面積(SLA)和葉乾物質含量(LDMC)的變化，並且分析了各個沙丘生境的土壤養分特徵。研究的主要目的是為了確定SLA及LDMC是否可以作為沙丘生境植物資源利用對策的指示指標。結果表明，3種沙丘生境的土地生產力及土壤養分之間存在顯著差異。各個植物種的平均SLA和LDMC在植物種之間差異顯著，在所研究的植物種中，固定沙丘上一年生草本狗尾草Setaria viridis的SLA最大(28.2平方公尺kg^(-1))，半固定沙丘上多年生禾草白草Pennisetum centrasiatum的SLA最小(8.6平方公尺kg^(-1))，LDMC的變化範圍在0.1（固定沙丘上的一年生雜草灰綠藜Chenopodium glaucum）至0.41（固定沙丘上的多年生草本蘆葦Phragmitis australis）之間。多數在兩種或三種沙丘生境均有分佈的植物其SLA在不同沙丘生境之間差異顯著，但是僅有6個植物種的LDMC在不同沙丘生境之間表現出差異(p＜0.05)。SLA和LDMC的相關分析發現，不同生境（流動沙丘，半固定沙丘和固定沙丘）或生活型（一年生和多年生）植物SLA和LDMC之間均呈負相關趨勢，但僅固定沙丘上植物多年生植物SLA和LDMC之間呈顯著負相關；就植物的生活型而言，一年生植物SLA和LDMC之間相關性不顯著。與許多研究結果類似，一年生植物的SLA顯著大於多年生植物的SLA，而且兩者之間LDMC存在顯著的差異(p＜0.05)。通過分析可以初步確定，SLA可以作為沙丘環境植物資源利用對策的指示指標。

關鍵字

一年生植物 ； 葉乾物質含量 ； 多年生植物 ； 沙丘 ； 比葉面積

並列摘要

We investigated the variations in specific leaf area (SLA) and leaf dry matter content (LDMC) of 20 species (10 annuals and 10 perennials) that have different distributional patterns in the Kerqin Sandy Land in northern China. The main purpose of our study was to determine if SLA and/or LDMC could be used as indicators of plant resource-use strategy in sand dune environments. The selected species were mainly distributed in three types of sand dunes: mobile sand dune, semi-fixed sand dune, and fixed sand dune. The three differed in their soil nutrient content and vegetation productivity. Both SLA and LDMC varied substantially among species in the different dunes. Maximum SLA (28.2 m^2 kg^(-1)) was observed in the annual grass Setaria viridis in a fixed sand dune, and the lowest SLA (8.6 m^2 kg^(-1)) was found in the perennial grass Pennisetum centrasiatum in a semi-fixed sand dune. LDMC varied from 0.10 g g^(-1) for the annual forb Chenopodium glaucum in a fixed sand dune to 0.41 g g^(-1) for the perennial grass Phragmitis australis in a fixed sand dune. For species common to two or three sites, their SLA and LDMC were significantly different between sites (P＜0.05), except for two species for SLA and six species for LDMC. SLA and LDMC were negatively correlated both in the three types of sand dunes and for each functional type (annual versus perennial species). However, SLA and LDMC were significantly correlated only for the species in fixed sand dune, perennial species as well as all species. The results of our study showed that the SLA of annual plant species was generally higher than that of perennial species and that LDMC was significantly different between annual compared to perennial plants (P＜0.05).

並列關鍵字

Annuals ； Leaf dry matter content ； Perennials ； Sand dune ； Specific leaf area