引种期同质园翅荚木主要叶功能性状与种源地环境关系

从比叶面积(SLA)、叶片相对含水量(LRWC)、叶组织密度(LTD)、叶片干物质含量(LDMC)、叶片碳(C)氮(N)磷(P)含量及其化学计量比等方面对在引种期同质园的广西桂林市(GGL)、广西靖西市(GJX)、湖南江华县(HJH)、湖南通道市县(HTD)、广东英德市(GYD)等5翅荚木种源叶片主要功能性状进行差异分析及相关性分析,并研究翅荚木叶功能性状与种源地环境因子的关系。结果显示,(1)不同种源间叶片C、N含量及C/N差异显著,5种源间叶片C含量GYD最高、GGL最低,N含量GJX最高、GYD最低,C/N为GYD最高、GJX最低。(2)比叶面积与叶组织密度呈显著负相关;叶片N含量与C/N和C/P呈显著负相关,与N/P呈显著正相关;C/P与P含量呈显著负相关,与C/N呈显著正相关;C/N与N/P呈显著负相关。(3)翅荚木叶功能性状主要受七月均温、年均温和相对湿度等地理环境因子影响。七月均温与C/P、比叶面积呈正相关,与叶片N含量、叶片干物质含量、叶组织密度呈负相关;年均温与C/N呈正相关,与N/P呈负相关;相对湿度与叶片P含量、叶组织密度呈正相关,与C/P、比叶面积呈负相关。研究结果有助于理解翅荚木对引种区的环境适应特征及其在引种期的生长与生存策略,对探究翅荚木的养分利用策略、揭示其对环境变化的响应机制等具有重要意义,并为相关部门选择适宜的翅荚木引种栽培种源及开展其优良种源的遗传改良等提供理论指导与决策参考。

Relationship between the leaf functional traits of Zenia insignis and the provenance environments in common gardens during the introduction period

The specific leaf area(SLA), leaf relative water content(LRWC), leaf tissue density(LTD), leaf dry matter content(LDMC), the leaf carbon(C), nitrogen(N), and phosphorus(P) content and their stoichiometric ratios were the selected functional traits of Zenia insignis. We analyzed the differences and their correlations of the functional traits among five provenances including Guilin City, Guangxi(GGL), Jingxi City, Guangxi(GJX), Jianghua County, Hunan(HJH),Tongdao County, Hunan(HTD) and Yingde City, Guangdong(GYD) in common gardens during the introduction period, in order to understand the relationship between leaf functional traits and environmental factors of provenances. The results were as follows:(1)the leaf C, N content and C/N differed significantly amony seedlings from difference provenances. The leaf C content in GYD was the highest, but the lowest in GGL. the leaf N content in GJX was the highest and the lowest in GYD. The C/N in GYD was the highest and the lowest in GJX.(2)there was a significant negative correlation between SLA and LTD. There were negatively correlated between N and C/N, C/P, but positively with N/P. The C/P were negatively correlated with P, but positively with C/N, whereas the C/N were negatively correlated with N/P.(3)the leaf traits of Zenia insignis were mainly affected by environmental factors, such as July temperature, mean annual temperature, and relative humidity. The July temperature showed a positive correlation with C/P and SLA, but negative with N, LDMC and LTD. Mean annual temperature demonstrated a positive correlation with C/N, but negative with N/P. Relative humidity showed a positive correlation with P and LTD, but negative with C/P and SLA. The results facilitated a better understanding of the adaptations of Zenia insignis to the introduction environment and the growth and survival strategies during the introduction period. It played a vital role in the nutrient utilization strategies of Zenia insignis and revealed the response mechanism of plants to the environmental changes. It also provided theoretical guidance and decision reference for the forestry departments to carry out excellent provenance selection and genetic improvement during the introduction period.